Abrégé

A numerical simulation optimization method of impact damage based on a laser mapped solid mesh is provided, including: measuring an impact damage size, a damage profile, a surface residual strain and a surface residual stress of a solid mesh element around the damage after firing a bullet by a light gas gun to impact a mesh area of a sample and obtaining the impact damage; establishing a parameterized impact finite element model to obtain a numerically simulated impact damage size, a numerically simulated impact damage profile, a numerically simulated surface residual strain and the surface residual stress of the surface solid mesh element; and calculating relative errors between the experimental measurements and the numerically simulated impact damage size, damage profile, surface residual strain and residual stress; and determining whether the relative errors are all less than expected values until a numerical simulation result meeting the accuracy requirements are obtained.

Classes IPC  ?

• G06F 30/23 - Optimisation, vérification ou simulation de l’objet conçu utilisant les méthodes des éléments finis [MEF] ou les méthodes à différences finies [MDF]
• G06T 17/20 - Description filaire, p.ex. polygonalisation ou tessellation
• G06F 111/10 - Modélisation numérique
• G06F 119/02 - Analyse de fiabilité ou optimisation de fiabilité; Analyse de défaillance, p.ex. performance dans le pire scénario, analyse du mode de défaillance et de ses effets [FMEA]

Abrégé

An air-ground joint trajectory planning and offloading scheduling method and system for distributed multiple objectives is provided. At the beginning of each timeslot, an unmanned aerial vehicle (UAV) selects a flight direction based on a total energy consumption of all devices and a total amount of unprocessed data of all the devices in the current system, and flies a fixed distance towards a certain direction. Before the UAV reaches a new location, each terrestrial user independently selects a task data offloading scheduling strategy based on the total energy consumption of all the devices and the total amount of the unprocessed data of all the devices in the current system. In order to improve an expected long-term average energy efficiency and data processing capability, the present disclosure also provides average feedbacks for an energy consumption and unprocessed data.

Classes IPC  ?

• G08G 5/00 - Systèmes de commande du trafic aérien

Abrégé

A multi-path internal microporous efficient refrigeration method and device for a frozen sand mold is provided. The device includes a frozen sand molding chamber, an electric lifting platform, a teflon porous lining, a removable porous aluminum plate, a frozen sand mold refrigeration device box, a sealing cover plate, an ultrasonic piezoelectric sheet, a U-shaped condenser tube, an ultrasonic generator, and a low-temperature refrigeration system. The teflon lining and the removable porous aluminum plate are provided with through hole structures of the same size and shape for rapid cooling from the surface to core of molding sand. The lifting platform is opened and the bumpy-ridge teflon lining rises to a highest point to facilitate demolding. The high- and low-frequency dual mode of the ultrasonic piezoelectric sheet can be used for vibrating and compacting the frozen sand mold, and can also assist in cutting forming.

Classes IPC  ?

• B22C 9/12 - Traitement des moules ou noyaux, p.ex. séchage, étuvage
• B22C 9/02 - Moules en sable ou moules analogues pour pièces coulées

Abrégé

A multi-robot collaborative planning method for machining a large capsule member of a spacecraft. The method comprises: for a multi-robot collaborative machining process of a large capsule member of a spacecraft, first, planning the number of instances of rotational displacement of a capsule, and the angle of each rotation; then, planning a multi-robot station layout and station switching strategy; and finally, when the position of the capsule and robot stations are fixed, planning a multi-robot machining task time sequence. By means of the method, the machining process of the large capsule member can be rapidly and systematically planned, and a scheme for the rotational displacement of the capsule and a scheme for the robot stations are rationally selected, thereby improving the rigidity of the collaborative operation of robots; and a machining time sequence is rationally planned, such that a multi-robot machining task process is more compact, and the idle time of the robots can be shortened, thereby improving the multi-robot collaborative machining efficiency.

Classes IPC  ?

• B25J 9/16 - Commandes à programme

Abrégé

Provided are a piezoelectric composite material, an actuator, and a preparation method of the actuator, relating to the technical field of piezoelectric composite material actuators. The piezoelectric composite material includes an upper interdigital electrode layer, a piezoelectric fiber composite layer and a lower interdigital electrode layer which are arranged in sequence from top to bottom. The upper interdigital electrode layer, the piezoelectric fiber composite layer and the lower interdigital electrode layer each are of a parallelogram structure. A piezoelectric ceramic fiber array is embedded on the piezoelectric fiber composite layer; and the piezoelectric ceramic fiber array is of a parallelogram structure. By arranging the piezoelectric ceramic fiber array of the parallelogram structure, the effective area of an actuator can be increased, and then the actuation performance of the actuator can be improved.

Classes IPC  ?

• H10N 30/00 - Dispositifs piézo-électriques ou électrostrictifs
• H10N 30/06 - Formation d’électrodes ou d’interconnexions, p.ex. de connections électriques ou de bornes
• H10N 30/092 - Formation de matériaux composites
• H10N 30/20 - Dispositifs piézo-électriques ou électrostrictifs à entrée électrique et sortie mécanique, p.ex. fonctionnant comme actionneurs ou comme vibrateurs
• H10N 30/853 - Compositions céramiques
• H10N 30/87 - Dispositifs piézo-électriques ou électrostrictifs - Détails de structure Électrodes ou interconnexions, p.ex. connexions électriques ou bornes

Abrégé

A weaving and needling integrated preform formation method, comprising the following steps: moving a core mold (21) in a certain direction along an axis of a weaving machine (1) by arranging grabbing devices at two ends of the weaving machine (1), and at the same time, performing weaving to form a first layer of fabric (25) on the surface of the core mold (21); laying a mesh tire (26) above the first layer of fabric (25) by means of a mesh tire automatic laying device, and performing pre-needling on a mesh tire (26) layer by means of a needling device, so that the mesh tire (26) can fit the surface of woven fabric; activating the weaving machine (1) again, moving the core mold (21) in the opposite direction, and at the same time, performing weaving to form a second layer of fabric (28) on the surface of the mesh tire (26); repeating the above steps to realize alternate fitting of the multiple layers of woven fabric and the mesh tires (26); and finally, performing main-needling on a preform by means of the automatic needling device to realize Z-directional enhancement of the preform. Further provided is a preform formation device used to realize the weaving and needling integrated preform formation method.

Classes IPC  ?

• D04C 1/00 - Tresses ou dentelles, p.ex. dentelles aux fuseaux; Leurs procédés de fabrication
• D04C 3/00 - Métiers à tresses ou à dentelles
• D04C 3/48 - Dispositifs auxiliaires
• D04H 1/46 - Non-tissés formés uniquement ou principalement de fibres coupées ou autres fibres similaires relativement courtes à partir de voiles ou couches composés de fibres ne possédant pas des propriétés cohésives réelles ou potentielles les voiles ou couches étant renforcées par des moyens mécaniques, p.ex. par roulage par aiguilletage ou opérations similaires pour provoquer l'enchevêtrement des fibres
• D04H 18/02 - Machines à aiguilleter avec des aiguilles

Abrégé

An efficient parallelization and deployment method of a multi-objective service function chain based on a CPU+DPU platform solves the problem of multi-objective deployment by constructing a heterogeneous computing architecture composed of an orchestrator and a server based on a CPU+DPU structure; the orchestrator is responsible for receiving an SFC request from a network operator; an SFC deployment algorithm based on deep reinforcement learning is operated, including a parallel strategy, a VNF topological order strategy and a DPU processing strategy to obtain an optimal deployment scheme of each request; then a resource management module is invoked to manage resources; and finally, a driver module is invoked to transmit the deployment scheme to a server for placement, and the server completes the deployment of SFC by using the CPU or the DPU respectively according to the deployment scheme.

Classes IPC  ?

• H04L 67/61 - Ordonnancement ou organisation du service des demandes d'application, p.ex. demandes de transmission de données d'application en utilisant l'analyse et l'optimisation des ressources réseau requises en tenant compte de la qualité de service [QoS] ou des exigences de priorité
• G06F 9/48 - Lancement de programmes; Commutation de programmes, p.ex. par interruption
• G06F 9/50 - Allocation de ressources, p.ex. de l'unité centrale de traitement [UCT]
• H04L 41/14 - Analyse ou conception de réseau
• H04L 41/16 - Dispositions pour la maintenance, l’administration ou la gestion des réseaux de commutation de données, p.ex. des réseaux de commutation de paquets en utilisant l'apprentissage automatique ou l'intelligence artificielle

Abrégé

A wire feeding mechanism suitable for fused deposition Additive Manufacturing (AM) of a flexible wire is provided, which includes a support housing. A melting nozzle is arranged at the lower end of the support housing, a hook is connected to the inner wall of the top end of the support housing, a connecting rod is connected to the inner wall of one side of the support housing, a wire drawing mechanism is connected to one end of the connecting rod, the wire drawing mechanism is located at the lower end of the hook, a limiting mechanism and a wire guide mechanism are connected to the inner wall of one side of the support housing, the limiting mechanism is located at the lower end of the wire drawing mechanism, the wire guide mechanism is located at the lower end of the limiting mechanism.

Classes IPC  ?

• B29C 64/321 - Alimentation
• B29C 64/118 - Procédés de fabrication additive n’utilisant que des matériaux liquides ou visqueux, p.ex. dépôt d’un cordon continu de matériau visqueux utilisant un matériau filamentaire mis en fusion, p.ex. modélisation par dépôt de fil en fusion [FDM]
• B33Y 30/00 - Appareils pour la fabrication additive; Leurs parties constitutives ou accessoires à cet effet

Abrégé

An elastic cooperative inference architecture and method for UAV cluster can dynamically update the scheduling policy according to the status of each node, and can deal with the failure of some nodes. In addition, the elastic cooperative inference architecture and method can process larger scale complex models on the embedded devices with limited performance carried by UAVs by means of cooperative inference, so as to improve the accuracy of intelligent applications. At the same time, the elastic cooperative inference architecture and method can adaptively update the allocation strategy when some nodes are unavailable or recovered, and improve the survivability of UAV cluster through elastic coordination.

Classes IPC  ?

• H04W 16/26 - Amplificateurs de cellules, p.ex. pour tunnels ou effet d'écran créé par des immeubles

Abrégé

An additive manufacturing device for an aerospace truss includes a raw material input unit, a longitudinal beam forming unit, a longitudinal beam traction unit, a cross beam forming unit and a truss support unit. The raw material input unit stores pre-impregnated wires and pre-impregnated tapes, and a motor drives rollers to convey the pre-impregnated wires and the pre-impregnated tapes forward; the longitudinal beam forming unit is composed of three sets of forming molds, and the pre-impregnated tapes form V-shaped longitudinal beams through heating molds; a stepper motor used in the longitudinal beam traction unit drives three sets of roller traction devices through steering gears to pull formed longitudinal beams; the cross beam forming unit is composed of a motion module and a printing module, and a truss cross beam is printed through a 3D printing method of molten deposition.

Classes IPC  ?

• B29C 64/218 - Rouleaux
• B29C 64/236 - Moyens d’entraînement pour un mouvement dans une direction dans le plan d’une couche
• B29C 64/295 - Fabrication additive, c. à d. fabrication d’objets en trois dimensions [3D] par dépôt additif, agglomération additive ou stratification additive, p.ex. par impression en 3D, stéréolithographie ou frittage laser sélectif - Détails ou accessoires à cet effet Éléments de chauffage
• B29L 31/30 - Véhicules, p.ex. bateaux ou avions, ou éléments de leur carrosserie
• B33Y 30/00 - Appareils pour la fabrication additive; Leurs parties constitutives ou accessoires à cet effet
• B33Y 80/00 - Produits obtenus par fabrication additive

Abrégé

A helicopter active noise suppression device integrating a sound array and on-propeller control, which relates to the technical field of helicopter noise reduction, includes an annular loudspeaker array, a plurality of force exciters, an error microphone, an Active Noise Cancellation (ANC) controller, a cockpit sensor, and an airborne computer. The annular loudspeaker array is arranged at a rotor hub and unsteady force exciters are arranged at each blade trailing edge to construct a sound field in an reversed phase to the sound wave of an original sound field with an ANC principle, thereby counteracting the noise and realizing the noise reduction of all-domain and all-type helicopter noise.

Classes IPC  ?

• B64C 27/00 - Giravions; Rotors propres aux giravions
• G10K 11/178 - Procédés ou dispositifs de protection contre le bruit ou les autres ondes acoustiques ou pour amortir ceux-ci, en général utilisant des effets d'interférence; Masquage du son par régénération électro-acoustique en opposition de phase des ondes acoustiques originales

Abrégé

A low-temperature airflow follow-up auxiliary sand discharge apparatus for cutting a frozen sand mold includes a frozen sand mold to be machined, a hollow cutter, a spindle mounted on the hollow cutter, an air pipe, and a refrigeration apparatus connected to one end of the air pipe. The refrigeration apparatus is fixed to an air pump by a valve. An inner cavity of the hollow cutter is provided with a cutter through hole along an axis. An inner cavity of the spindle is provided with a spindle through hole along the axis. An upper end of the spindle is provided with a bearing seat hole for placing a bearing. An outer circle of the bearing matches the bearing seat hole, and an inner circle of the bearing is mounted with an air pipe connector. The air pipe is connected and fixed to the air pipe connector.

Classes IPC  ?

• B23B 27/10 - Outils de coupe avec une disposition particulière pour le refroidissement
• B23B 51/04 - Outils pour machines à percer pour trépaner

Abrégé

The present disclosure discloses a trans-media unmanned aerial vehicle device and a control method thereof. The trans-media unmanned aerial vehicle device includes a housing, and a piston which is arranged in the housing and is capable of moving in a reciprocating manner in the housing; one end of the housing is provided with an opening; several flying wings are uniformly arranged in a circumferential direction of the piston; the flying wings are rotatably connected to a side of the piston facing the opening and are spread or retracted like an umbrella; and under the pushing of the piston, the flying wings can be spread to the outside of the housing and retracted back into the housing.

Classes IPC  ?

• B64U 20/50 - Véhicules aériens sans pilote pliables ou repliables
• B64U 20/75 - Caractéristiques de construction du corps du véhicule aérien sans pilote le corps étant formé par des plaques assemblées ou par une plaque superposée à un châssis
• B64U 70/00 - Dispositions pour le lancement, le décollage ou l'atterrissage
• B64U 10/10 - Giravions

Abrégé

The present invention provides an unmanned aerial vehicle conflict detection method and apparatus of an airspace digital grid and a storage medium. The method comprises: establishing an airspace discrete subdivision grid model; constructing a grid coding rule and a conversion relationship of the longitude and latitude coordinates and grid codes; establishing an unmanned aerial vehicle safety protection area to perform gridding representation on an unmanned aerial vehicle in the airspace; establishing a coordinate system to convert the grid codes of the unmanned aerial vehicle into coordinates; utilizing a GJK algorithm to calculate a Minkowski difference set of two blocks; and determining whether the unmanned aerial vehicle conflicts or not according to the Minkowski difference set. By combining airspace grid codes with the GJK algorithm, compared with the traditional paired coordinate operation, the complexity of conflict detection can be effectively reduced, a large amount of calculation time can be saved, and the efficiency of unmanned aerial vehicle conflict detection can be effectively improved, to satisfy rapid real-time conflict detection requirements for the unmanned aerial vehicle in the airspace.

Classes IPC  ?

• G06F 30/20 - Optimisation, vérification ou simulation de l’objet conçu
• G01C 21/22 - Tables traçantes
• G06F 119/02 - Analyse de fiabilité ou optimisation de fiabilité; Analyse de défaillance, p.ex. performance dans le pire scénario, analyse du mode de défaillance et de ses effets [FMEA]

Abrégé

The present disclosure belongs to the technical field of ultrasonic non-destructive testing, and discloses a method for extracting feature path signals of pipeline ultrasonic helical guided waves. The method includes: transforming a nonlinear wave number relationship of a pipe wall into a linear form by first order Taylor expansion, the approximation being reasonable under narrow band excitation; on this basis, establishing multimodal and multipath guided wave propagation over-complete data sets, and obtaining a modal weight factor and a path weight factor through a single-layer neural network algorithm; and multiplying the modal weight factor by the multimodal data set to separate a plurality of groups of unimodal signals from a whole signal, and multiplying the path weight factor by the multipath data set to extract unimodal feature path signals. The present disclosure can effectively extract unimodal unipath guided wave feature signals and improve the signal identification, and has broad prospects.

Classes IPC  ?

• G01N 29/46 - Traitement du signal de réponse détecté par analyse spectrale, p.ex. par analyse de Fourier
• G01N 29/04 - Analyse de solides

Abrégé

The present disclosure relates to a method and system for detecting a structural defect in additive manufacturing. The method includes: layering a three-dimensional model of an additive manufacturing test piece to obtain a two-dimensional contour of an interface of each layer, and generating a machining path; arranging a non-contact sensor at a fixed measuring point of the additive manufacturing test piece, and acquiring an ultrasonic signal at each machining point when a pulse laser conducts machining point by point along the machining path; forming a visual ultrasonic field based on all the ultrasonic signals, and determining ultrasonic field data; determining, based on the ultrasonic field data, a curve of a peak of an incident wave changing with the machining path; and determining whether a machining defect exists at the machining points based on the curve of the peak of the incident wave changing with the machining path.

Classes IPC  ?

• G01N 29/06 - Visualisation de l'intérieur, p.ex. microscopie acoustique
• G01N 29/46 - Traitement du signal de réponse détecté par analyse spectrale, p.ex. par analyse de Fourier
• G01N 29/22 - Recherche ou analyse des matériaux par l'emploi d'ondes ultrasonores, sonores ou infrasonores; Visualisation de l'intérieur d'objets par transmission d'ondes ultrasonores ou sonores à travers l'objet - Détails
• B33Y 40/00 - Opérations ou équipements auxiliaires, p.ex. pour la manipulation de matériau
• B33Y 50/00 - Acquisition ou traitement de données pour la fabrication additive

Abrégé

A multi-view outlier detection algorithm based on the tensor representation is provided. Specifically, the multi-view data are firstly transformed into a set of tensors, and then its low-rank representation is learned. Finally, an outlier function is designed in the case of tensor representation to realize detection.

Classes IPC  ?

• G06F 17/16 - Calcul de matrice ou de vecteur
• G06F 17/11 - Opérations mathématiques complexes pour la résolution d'équations

Abrégé

A multi-degree-of-freedom additive manufacturing based printing method for a helmet. The method comprises: first printing a helmet supporting mold (2) on the basis of the inner surface of a target helmet and by using water-soluble resin; on the basis of the thickness of a feature layer, performing curved-surface equidistant offset layering on a model of the target helmet from inside to outside starting from the inner surface; on the basis of the integrity of a curved-surface layer and by taking a substrate and protrusions as segmentation targets, performing region-by-region traversal and segmentation from inside to outside, and storing slice information; performing shaping processing for an inward shrinking wall thickness on all protruding regions which have been subjected to traversal and segmentation; on the basis of the settings of filling parameters, obtaining filling information of each layer of series curved surfaces of a target workpiece; by means of a multi-degree-of-freedom printing device, performing layer-by-layer filling on a supporting mold along a path setting, so as to complete printing of the target helmet; and finally, placing the helmet and the supporting mold together into a water tank, such that after the mold is dissolved, a final target helmet workpiece (1) is obtained. In the method, a new idea and a new method are provided for realizing additive manufacturing of a helmet workpiece which is of a complex curved-surface structure.

Classes IPC  ?

• B29C 64/106 - Procédés de fabrication additive n’utilisant que des matériaux liquides ou visqueux, p.ex. dépôt d’un cordon continu de matériau visqueux
• B29C 64/386 - Acquisition ou traitement de données pour la fabrication additive
• B29C 64/393 - Acquisition ou traitement de données pour la fabrication additive pour la commande ou la régulation de procédés de fabrication additive

Abrégé

A stepless-adjustment efficient additive manufacturing device for a specially shaped rotary body sand mold, the device comprising an aluminum alloy frame (1), and an ink jet system, a shakeout device, a sand scraping device and a Z-axis rotary lifting movement system, which are arranged on the aluminum alloy frame. In the device, quantitative shakeout and uniform sand spreading are implemented on a rotary printing platform by keeping a shakeout box (7), a printing nozzle (3) and a sand scraping plate fixed, and the rotary printing platform can descend accurately and controllably by means of a ball screw (21) device, thereby spreading sand layer by layer and performing printing layer by layer; in addition, the height by which the rotary platform descends is adjusted steplessly, and resin saturation between molding sand particles is adjusted according to a micro-droplet jet printing grayscale, thereby improving the overall printing speed and strength of a sand mold. Further disclosed is a stepless-adjustment efficient additive manufacturing method for a specially shaped rotary body sand mold. The device achieves, with stepless heightwise adjustment, 3D printing of a specially shaped rotary body sand mold. When manufacturing specially shaped rotary bodies, the specially shaped rotary body sand mold has a high forming efficiency and can manufacture specially shaped rotary bodies with a good quality; in addition, the process cost and waste are reduced.

Classes IPC  ?

• B22C 9/02 - Moules en sable ou moules analogues pour pièces coulées
• B33Y 10/00 - Procédés de fabrication additive
• B22C 19/04 - Dispositifs de commande particuliers pour machines à mouler
• B22C 19/02 - Tables de moulage

Abrégé

A method for preparing a negative pressure film-covering frozen sand mold includes: directly obtaining a mold cavity of a sand mold through numerically controlled machining of a frozen sand blank; covering a surface, brushed with a thermal insulation coating, of the mold cavity of the sand mold with a softened thin film, and covering an outer surface of the sand mold with a back film to seal a sand box; fixing the frozen sand mold in an air extraction sand box with a vacuum chamber, and extracting air through a vacuum pump, so that the thin film tightly adheres to the sand mold through vacuum suction force; and closing the box to obtain an integral sand mold, and pouring a casting at room temperature or low temperature under negative pressure. The method is environment-friendly, and the prepared frozen sand mold has high strength and is convenient for sand cleaning.

Classes IPC  ?

• B22C 9/12 - Traitement des moules ou noyaux, p.ex. séchage, étuvage
• B22C 9/03 - Moules en sable ou moules analogues pour pièces coulées formés par moulage sous vide

Abrégé

Disclosed in the present invention is a low-light image enhancement method based on reinforcement learning and aesthetic evaluation. The method comprises: firstly, generating images of an abnormal brightness in different illumination scenes, and constructing a training data set of a reinforcement learning system on the basis of the images; then initializing the training data set, a policy network and a value network in the reinforcement learning system, and updating the policy network and the value network on the basis of a non-reference reward value and an aesthetic evaluation reward value; and outputting an enhanced image result after training is completed. By means of the present invention, an action space range which is defined in reinforcement learning is expanded, such that an enhancement operation which is obtained by an input low-light image has a larger dynamic range, thereby achieving higher flexibility for a real scene, and low-light image enhancement requirements in the real scene can thus be better satisfied. In addition, scores of aesthetic quality evaluations are introduced as a part of a loss function, so that an enhanced image has a better visual effect and a better subjective user evaluation score.

Classes IPC  ?

• G06T 5/00 - Amélioration ou restauration d'image
• G06T 7/90 - Détermination de caractéristiques de couleur
• G06N 20/00 - Apprentissage automatique

Abrégé

An extreme high-temperature in-situ tenon joint fretting fatigue experimental apparatus, comprising: a loading member (100) used for supporting a tenon test piece (001) and a mortise test piece (002), and applying periodic reciprocating horizontal fatigue load to the tenon test piece (001); a heating member (200) provided below the tenon test piece (001) and the mortise test piece (002) and used for heating the tenon test piece (001) and the mortise test piece (002); a thermal insulation sleeve (300) wrapping the heating member (200); and a control member (400) used for controlling on or off of the loading member (100) and the heating member (200) to apply horizontal fatigue load to the tenon test piece (001) and heating the tenon test piece (001) and the mortise test piece (002). Hot electrons entering a detector are reduced by using a variety of measures, thereby improving the imaging quality of an in-situ scanning electron microscope in an extreme high-temperature environment, and improving the upper limit of experimental temperature. The problem that the high-temperature imaging quality is degraded, the image is whitened, and effective information cannot be observed and the like due to the fact that hot electrons generated by a heating apparatus or a sample in a high-temperature environment interfere with collection of signal electrons performed by the detector is solved.

Classes IPC  ?

• G01N 3/36 - Recherche des propriétés mécaniques des matériaux solides par application d'une contrainte mécanique en appliquant des efforts répétés ou pulsatoires engendrés par des moyens pneumatiques ou hydrauliques
• G01N 3/02 - Recherche des propriétés mécaniques des matériaux solides par application d'une contrainte mécanique - Parties constitutives
• G01N 3/04 - Mandrins
• G01N 1/44 - Traitement d'échantillons mettant en œuvre un rayonnement, p.ex. de la chaleur
• G01N 23/2251 - Recherche ou analyse des matériaux par l'utilisation de rayonnement [ondes ou particules], p.ex. rayons X ou neutrons, non couvertes par les groupes , ou en mesurant l'émission secondaire de matériaux en utilisant des microsondes électroniques ou ioniques en utilisant des faisceaux d’électrons incidents, p.ex. la microscopie électronique à balayage [SEM]

Abrégé

A three-dimensional (3D) spectrum situation completion method and device based on a generative adversarial network includes performing graying and coloring preprocessing based on incomplete 3D spectrum situations from historical or empirical spectrum data obtained by a UAV through sampling a target region, obtaining three-channel incomplete 3D spectrum situation maps displayed in colors, forming a training set based on the incomplete 3D spectrum situation maps; training the generative adversarial network based on the training set and obtaining a trained generator network in the generative adversarial network, performing graying and coloring preprocessing based on a measured incomplete 3D spectrum situation obtained by the UAV through sampling a specified measurement region, obtaining a three-channel measured incomplete 3D spectrum situation map displayed in colors, and using the measured incomplete 3D spectrum situation map as input data to the generator network to obtain a three-channel measured complete 3D spectrum situation map displayed in colors.

Classes IPC  ?

• G06T 11/00 - Génération d'images bidimensionnelles [2D]
• G06T 7/90 - Détermination de caractéristiques de couleur

Abrégé

The present invention provides a method for preparing a negative-pressure film-coated frozen sand mold. The method for preparing the frozen sand mold comprises the following steps: numerical control processing is directly performed on a frozen sand blank to obtain a sand mold cavity; a softened thin film is coated on the surface of the sand mold cavity coated with a heat insulation coating, and meanwhile, a back film is coated on the outer surface of the sand mold to close a sand box; an air extraction sand box provided with a vacuum air chamber is used for fixing the frozen sand mold, air extraction is performed by means of a vacuum pump, and the thin film is tightly attached to the sand mold by means of vacuum suction force; and the whole sand mold is obtained after boxes are combined, negative pressure is kept, and a casting is poured in a normal-temperature or low-temperature environment. The method is environment-friendly and green, and the prepared frozen sand mold is high in strength and convenient to clear sand; the volume of gas generated in the pouring process is small, metal is rapidly solidified, and castings having good internal quality, high size precision, and excellent surface quality can be produced.

Classes IPC  ?

• B22D 18/06 - Coulée par le vide, c. à d. utilisant le vide pour remplir le moule

Abrégé

A high-flexibility multi-region sand-spreading device for multi-material sand-mold printing. The sand-spreading device comprises a printing mechanism (1), a compaction mechanism (2), a vibratory sand-spreading mechanism (3), a machine base ball-screw mechanism (4), a supporting plate (5), a machine base (6) and a ball-screw mechanism (17), wherein the vibratory sand-spreading mechanism, the compaction mechanism and the printing mechanism are mounted on the supporting plate, and jointly slide on the machine base ball-screw mechanism during printing, so as to sequentially complete sand-spreading, compaction and printing operations in a printing region; a sand-spreading box (13) of the vibratory sand-spreading mechanism and a follow-up sand-spreading mechanism are connected to the ball-screw mechanism by means of a moving slide table to achieve two-dimensional movement, and a pressing plate (22) of the compaction mechanism controls lifting by using an electric pushing cylinder (19), a lifting guide column (20) and a bearing (23), so as to achieve a compaction operation after sand-spreading; and the printing mechanism comprises a nozzle transverse beam component (24), a drag chain (25), a transverse base (26) and a print head component (27), and the print head component is driven by the transverse base and the drag chain to achieve two-dimensional movement printing. Further provided is a high-flexibility multi-region sand-spreading method for multi-material sand-mold printing. By means of the device and the method, the printing precision and the flexibility manufacturing capability of multi-material sand-mold integral printing and forming equipment can be improved.

Classes IPC  ?

• B22C 9/02 - Moules en sable ou moules analogues pour pièces coulées
• B33Y 30/00 - Appareils pour la fabrication additive; Leurs parties constitutives ou accessoires à cet effet

Abrégé

The present invention relates to the field of computer numerical simulation, and provides a helicopter flow field numerical simulation system and method based on a graphics processing unit (GPU). The helicopter flow field numerical simulation system comprises a central processing unit (CPU) (1) and a GPU (2); the CPU (1) is used to: initialize a motion nested grid according to a preset configuration file and a helicopter grid file to be simulated (S1); determine surface batch information according to grid blocks in the motion nested grid (S2); and determine a nested interpolation relationship and an interpolation mapping index between the grid blocks according to the helicopter grid file to be simulated at a current simulation moment, and perform flow field information interaction among the grid blocks according to the nested interpolation relationship, the interpolation mapping index, and flow field information of the grid blocks to obtain flow field information of the helicopter to be simulated (S4); and the GPU (2) is used to calculate the flow field information of the grid blocks in the motion nested grid according to the surface batch information by using a computational fluid dynamics (CFD) method (S3). The CPU and the GPU are combined, such that the simulation efficiency of a helicopter flow field is improved.

Classes IPC  ?

• G06F 30/28 - Optimisation, vérification ou simulation de l’objet conçu utilisant la dynamique des fluides, p.ex. les équations de Navier-Stokes ou la dynamique des fluides numérique [DFN]

Abrégé

A nozzle-replaceable print head for continuous fiber printing, and a printing method. The print head comprises a fixing support (0200), a wire feeding module (0300) located on the upper part of a structure, an upper guide tube (0400), a shearing module (0500) located at the middle of the structure, a lower guide tube (0600), a heat dissipation sleeve (0700), a throat tube (0800), a heating coil (0900), and a nozzle module (1000) located at the bottom of the structure, wherein a continuous fiber-reinforced thermoplastic resin-based pre-impregnated composite wire (0100) coaxially passes through the print head from the other side from top to bottom and is fed for printing. By providing an adjusting groove having a scale indicator, clamping and feeding states of pre-impregnated composite wires (0100) of different specifications are standardized and adjusted; and by providing the upper guide tube (0400) and the half-wrapped lower guide tube (0600), the shearability of the pre-impregnated wires and the subsequent feeding of the broken wires are improved, so that high-efficiency and high-quality formation of a workpiece is achieved, and heterogeneous multi-layer forming printing of a workpiece having a specific application requirement can be achieved.

Classes IPC  ?

• B29C 64/209 - Têtes; Buses
• B29C 64/118 - Procédés de fabrication additive n’utilisant que des matériaux liquides ou visqueux, p.ex. dépôt d’un cordon continu de matériau visqueux utilisant un matériau filamentaire mis en fusion, p.ex. modélisation par dépôt de fil en fusion [FDM]
• B33Y 50/02 - Acquisition ou traitement de données pour la fabrication additive pour la commande ou la régulation de procédés de fabrication additive

Abrégé

Disclosed in the present invention is a composite material filament melt impregnation device having an automatically-liftable flow channel used for additive manufacturing, which comprises a mechanically lifting device, a heating device, a curved resin impregnation flow channel, a filament-guiding block, a single-screw extruder, a replaceable combined mold nozzle and a resin riser. The present invention can greatly improve the efficiency of replacing filaments and dealing with broken filaments during a continuous fiber filament forming process, thereby reducing the operation difficulty in the production process and guaranteeing the safety of operators. By designing the resin riser, the internal pressure of a melt cavity can be dynamically adjusted within a small range during the production process, so that the product quality stability is improved, and finally, the continuous production and rapid replacement of high-performance continuous fiber composite material filaments are achieved.

Classes IPC  ?

• B29B 11/10 - Moulage par extrusion
• B29B 11/16 - Fabrication de préformes caractérisées par la structure ou la composition comprenant des charges ou des agents de renforcement
• B29C 64/314 - Préparation
• B33Y 40/10 - Prétraitement

Abrégé

The present disclosure provides an electrochemical machining device and a method for a blisk using an electrode array, which relate to the technical field of electrochemical machining. The electrochemical machining device comprises an outer ring-shaped rotating ring, an inner ring-shaped base and a plurality of cathode rods. An inner diameter of the outer ring-shaped rotating ring is larger than an outer diameter of the inner ring-shaped base, and an inner diameter of the inner ring-shaped base is larger than an outer diameter of the blisk. The outer ring-shaped rotating ring and the inner ring-shaped base are coaxially arranged. Middle parts of the cathode rods are connected with the inner ring-shaped base, outer ends of the cathode rods are rotatably connected with the outer ring-shaped rotating ring, and inner ends of the cathode rods are provided with trepanning cathode pieces or radial feeding electrodes.

Classes IPC  ?

• B23H 9/10 - Usinage d'aubes de turbine ou de buses
• B23H 3/04 - Electrodes spécialement adaptées à cet effet ou leur fabrication
• B23H 7/12 - Disques-électrodes tournants

Abrégé

Disclosed are a multi-channel electrochemical machining device and method for a blisk, and relate to the technical field of blisk electrochemical machining. The multi-channel electrochemical machining device for a blisk comprises an electrolytic bath used for accommodating an electrolyte, a blisk workpiece, a tube electrode and a top cover plate. The top cover plate is located above the blisk workpiece. An electrolysis chamber used for the tube electrode to electrolyze the blisk workpiece is formed between the lower surface of the top cover plate and the surface of the blisk workpiece. The electrolysis chamber communicates with the electrolytic bath. A drainage seam communicating the electrolysis chamber and the electrolytic bath along the axial direction of the blisk workpiece is formed in the upper surface of the top cover plate.

Classes IPC  ?

• B23H 3/04 - Electrodes spécialement adaptées à cet effet ou leur fabrication
• B23H 11/00 - Appareils auxiliaires ou détails non prévus ailleurs

Abrégé

Provided in the present invention are a porous sealing plate and a preparation method therefor, which belong to the technical field of sealing plates. The porous sealing plate comprises an enclosure frame, a core material, a getter and a membrane material, wherein the getter is located in the core material, and the core material has an aperture and is an inorganic powder and/or fiber; the enclosure frame has a continuous outline structure, is made of an engineering plastic, and is located at the periphery of the core material, the aperture of the core material or both the periphery and the inner aperture of the core material; the membrane material is an aluminum-plastic composite membrane, a polyimide composite membrane, a metallized membrane or an inorganic non-metal coated plastic composite membrane; and the membrane material wraps the surface of the core material. By controlling the enclosure frame structure of an engineering plastic, the free design of the appearance and the inner aperture structure of a porous sealing plate having a complex structure is achieved, a breakthrough is made to the single and unchanged structural appearance characteristic caused by vacuum sealing of a traditional porous sealing plate, the porous sealing plate can adapt to the heat preservation and heat insulation of a complex structure, and the application range thereof is widened; moreover, the flatness of the appearance or the inner aperture of the porous sealing plate is improved by the enclosure frame of the engineering plastic, and the porous sealing plate is not prone to deformation.

Classes IPC  ?

• F16L 59/065 - Dispositions utilisant une couche d'air ou le vide utilisant le vide

Abrégé

A method for implementing fault diagnosis by means of a spread spectrum carrier includes the following steps: designing incident signal parameters, selecting a spread spectrum sequence for fault detection, determining a center frequency and a sequence length of a spread spectrum code, and segmenting and transforming a power carrier source signal; using the fault detection spread spectrum sequence as a carrier spread spectrum code, and performing spread spectrum modulation on the transformed power carrier source signal to generate an SSPLCR sequence; coupling the SSPLCR sequence to a cable to be tested, and when the cable works normally without failure, transmitting the SSPLCR signal to the receiving terminal via the cable; when the cable fails, reflecting the SSPLCR signal back to the transmitting terminal.

Classes IPC  ?

• H04B 3/46 - Surveillance; Tests
• H04B 3/54 - Systèmes de transmission par lignes de réseau de distribution d'énergie
• H04B 1/7087 - Aspects de la synchronisation de la porteuse

Abrégé

A semantic segmentation method for aircraft point cloud based on voxelization and three views, including: filtering a collected point cloud followed by centralization to obtain a centralized point cloud; inputting the centralized point cloud into a T-Net rotation matrix network; rotating the centralized point cloud to a front side followed by voxelization to obtain a voxelized point cloud; subjecting the voxelized point cloud to voxel filling to obtain a voxel-filled point cloud; calculating thickness maps of three views of the voxel-filled point cloud, followed by sequentially stitching and inputting to the point cloud semantic segmentation network to train the point cloud semantic segmentation network; inputting the collected point cloud into the trained point cloud semantic segmentation network; and predicting a result semantic segmentation of a 3D point cloud of the aircraft.

Classes IPC  ?

• G06T 3/60 - Rotation d'une image entière ou d'une partie d'image
• G06T 3/40 - Changement d'échelle d'une image entière ou d'une partie d'image

Abrégé

The present disclosure disclose a method for feature detection of complex defects based on multimodal data, including feature extraction of multimodal data, multimodal feature cross-guided learning, multimodal feature fusion, and defect classification and regression. Feature extraction networks for multimodal two-dimensional data are constructed first, and a defect data set is sent to the networks for training; during training, cross-guided learning is implemented by using a multimodal feature cross-guidance network; then feature fusion is performed by using a weight adaptive method; and finally a defect detection task is implemented by using a classification subnetwork and a regression subnetwork. In the present disclosure, fusion of the multimodal data in a process of feature detection of the complex defects can be implemented efficiently, a capability of detecting the complex defects in an industrial environment can be improved more effectively, and production efficiency in an industrial manufacturing process is ensured.

Classes IPC  ?

• G06V 10/82 - Dispositions pour la reconnaissance ou la compréhension d’images ou de vidéos utilisant la reconnaissance de formes ou l’apprentissage automatique utilisant les réseaux neuronaux
• G06V 10/774 - Dispositions pour la reconnaissance ou la compréhension d’images ou de vidéos utilisant la reconnaissance de formes ou l’apprentissage automatique utilisant l’intégration et la réduction de données, p.ex. analyse en composantes principales [PCA] ou analyse en composantes indépendantes [ ICA] ou cartes auto-organisatrices [SOM]; Séparation aveugle de source méthodes de Bootstrap, p.ex. "bagging” ou “boosting”
• G06V 10/80 - Fusion, c. à d. combinaison des données de diverses sources au niveau du capteur, du prétraitement, de l’extraction des caractéristiques ou de la classification

Abrégé

A feature-guided scanning trajectory optimization method for a 3D measurement robot, including: building a 3D digital model of an aircraft surface; obtaining a size of the 3D digital model; extracting features to be measured; classifying the features to be measured; calculating a geometric parameter of each type of features to be measured; generating an initial scanning trajectory of each type of features to be measured; building a constraint model of the 3D measurement robot; optimizing the initial scanning trajectory into a local optimal scanning trajectory; and planning a global optimal scanning trajectory of each type of features to be measured on the aircraft surface by using a modified ant colony optimization algorithm.

Classes IPC  ?

• B25J 9/16 - Commandes à programme
• G01B 21/20 - Dispositions pour la mesure ou leurs détails, où la technique de mesure n'est pas couverte par les autres groupes de la présente sous-classe, est non spécifiée ou est non significative pour mesurer des contours ou des courbes, p.ex. pour déterminer un profil
• B25J 19/02 - Dispositifs sensibles

Abrégé

A variable track-based blockage-resistant scheduling policy for an OHT transport system. The policy comprises: according to a task scheduling method, allocating a policy to an OHT trolley, and determining the shortest path and track change points in the path according to a path planning method; according to a travel time prediction method, predicting the time at which the trolley passes each track change point, and sorting the times. The trolley executes a task according to a planned path, and a variable track changes tracks in advance according to the passing sequence and trolley status, and waits for the trolley to pass; when the trolley reaches a target station point, a station track moves to a working state, a stopper block operates, and the trolley starts loading or unloading; after the trolley completes loading or unloading and a preparation track of the station track has no trolley, the stopper block is released, and the station track moves to an idle state; finally, when the trolley completes the task, the system state is updated. According to the method, a variable track and a station track are employed, solving the problems in the existing technology of the utilization rate of fixed track resources being low and station points being blocked.

Classes IPC  ?

• G06Q 10/04 - Prévision ou optimisation spécialement adaptées à des fins administratives ou de gestion, p. ex. programmation linéaire ou "problème d’optimisation des stocks"

Abrégé

This application discloses a semantic learning-based down-sampling method of point cloud data of an aircraft, including: (S1) constructing a multi-input encoder based on feature learning according to point cloud semantic learning principle; inputting the point cloud data of the aircraft and feature point data into the multi-input encoder for feature fusion followed by decoding using a decoder the multi-input feature fused data to obtain to-be-measured data; (S2) constructing and training a point cloud feature weight calculation network based on semantic learning to acquire a feature weight of each point in the to-be-measured data; and (S3) performing spatial weighted sampling on the feature weight of each point in the to-be-measured data followed by down-sampling based on Gaussian distribution-based spatial sampling principle.

Classes IPC  ?

• G06T 3/40 - Changement d'échelle d'une image entière ou d'une partie d'image

Abrégé

A cross-scale defect detection method based on deep learning, including: (S1) building a vision data acquisition system to acquire a surface image of a part to be processed; and building a defect dataset; (S2) building a deep learning-based cross-scale defect detection model; and inputting the defect dataset obtained in the step (S1) into the deep learning-based cross-scale defect detection model for model training; and (S3) building a defect detection system according to the deep learning-based cross-scale defect detection model and the vision data acquisition system; and detecting a defect of the surface image of the part to be processed.

Classes IPC  ?

• G06T 7/00 - Analyse d'image
• G06V 20/70 - RECONNAISSANCE OU COMPRÉHENSION D’IMAGES OU DE VIDÉOS Éléments spécifiques à la scène Étiquetage du contenu de scène, p.ex. en tirant des représentations syntaxiques ou sémantiques
• G06V 10/77 - Dispositions pour la reconnaissance ou la compréhension d’images ou de vidéos utilisant la reconnaissance de formes ou l’apprentissage automatique utilisant l’intégration et la réduction de données, p.ex. analyse en composantes principales [PCA] ou analyse en composantes indépendantes [ ICA] ou cartes auto-organisatrices [SOM]; Séparation aveugle de source
• G06V 10/80 - Fusion, c. à d. combinaison des données de diverses sources au niveau du capteur, du prétraitement, de l’extraction des caractéristiques ou de la classification

Abrégé

The present disclosure provides a point cloud denoising method based on multi-level attention perception, including the following steps: constructing a data set of point cloud denoising; constructing a point cloud denoising neural network, including a patch feature encoder, a global level perception module, a global level attention module, and a multi-offset decoder module, and training a network model by using the data set of point cloud denoising; for input point cloud, separately obtaining a neighborhood patch of a point of each original data point, and inputting coordinates of each data point in the neighborhood patch of a point to a trained denoising neural network to obtain a location offset of each original point; and separately adjusting, based on the obtained location offset, a location corresponding to each original data point in the input point cloud, to complete point cloud denoising.

Classes IPC  ?

• G06N 3/04 - Architecture, p.ex. topologie d'interconnexion
• G06T 5/00 - Amélioration ou restauration d'image

Abrégé

k to be solved. According to the present disclosure, by adjusting the arrays, the number of probes and appropriate solution algorithm can be selected based on the testing accuracy; and the method can achieve quantitative evaluation of non-destructive testing, and can be widely used in practical guided wave testing applications of industrial non-destructive testing.

Classes IPC  ?

• G01N 29/06 - Visualisation de l'intérieur, p.ex. microscopie acoustique
• G06T 7/00 - Analyse d'image
• G01N 29/04 - Analyse de solides
• G06T 7/40 - Analyse de la texture

Abrégé

The present disclosure provides a method for analyzing a minor defect based on a progressive segmentation network, including: acquiring an original image for a surface of a component, and cropping the original image into a plurality of patches; inputting each of the patches to a minor defect feature extraction network to extract an image feature; classifying the patch into a defective image or a non-defective background image according to an extracted image feature; inputting an extracted image feature of the defective image to a defect segmentation network to obtain a segmentation mask image of a corresponding defect; and quantitatively analyzing the defect according to the segmentation mask image to obtain information such as an area, a length and a width of the defect.

Classes IPC  ?

• G06T 7/00 - Analyse d'image
• G06T 7/194 - Découpage; Détection de bords impliquant une segmentation premier plan-arrière-plan
• G06T 7/12 - Découpage basé sur les bords

Abrégé

The present disclosure discloses a method for multi-view point cloud registration for a whole aircraft based on a spherical harmonic feature (SHF). Gaussian sphere projection is mainly performed on a local point cloud. An SHF of each point is obtained by using a spherical harmonic transform technology. A constraint correspondence between feature points is found based on an SHF of each point in the point cloud. Multi-view point cloud data registration is performed according to an optimization graph method under a constraint of the SHF. A key of multi-view point cloud registration is to search for feature constraint relationships between different observation stations and perform non-linear solution based on these relationships, so as to obtain a pose parameter of a point cloud in each viewing angle.

Classes IPC  ?

• G06T 19/20 - Transformation de modèles ou d'images tridimensionnels [3D] pour infographie Édition d'images tridimensionnelles [3D], p.ex. modification de formes ou de couleurs, alignement d'objets ou positionnements de parties
• G06T 3/00 - Transformation géométrique de l'image dans le plan de l'image
• G06T 5/00 - Amélioration ou restauration d'image
• G06T 7/64 - Analyse des attributs géométriques de la convexité ou de la concavité

Abrégé

2N) based on metric learning; and performing target feature extraction and metric learning in sequence to realize rapid identification and location of defects.

Classes IPC  ?

• G06V 10/774 - Dispositions pour la reconnaissance ou la compréhension d’images ou de vidéos utilisant la reconnaissance de formes ou l’apprentissage automatique utilisant l’intégration et la réduction de données, p.ex. analyse en composantes principales [PCA] ou analyse en composantes indépendantes [ ICA] ou cartes auto-organisatrices [SOM]; Séparation aveugle de source méthodes de Bootstrap, p.ex. "bagging” ou “boosting”
• G06T 7/00 - Analyse d'image
• G06V 10/764 - Dispositions pour la reconnaissance ou la compréhension d’images ou de vidéos utilisant la reconnaissance de formes ou l’apprentissage automatique utilisant la classification, p.ex. des objets vidéo
• G06T 7/73 - Détermination de la position ou de l'orientation des objets ou des caméras utilisant des procédés basés sur les caractéristiques
• G06V 10/77 - Dispositions pour la reconnaissance ou la compréhension d’images ou de vidéos utilisant la reconnaissance de formes ou l’apprentissage automatique utilisant l’intégration et la réduction de données, p.ex. analyse en composantes principales [PCA] ou analyse en composantes indépendantes [ ICA] ou cartes auto-organisatrices [SOM]; Séparation aveugle de source
• G06V 10/82 - Dispositions pour la reconnaissance ou la compréhension d’images ou de vidéos utilisant la reconnaissance de formes ou l’apprentissage automatique utilisant les réseaux neuronaux

Abrégé

An ultrasound-assisted penetration and uniform forming device for freezing and printing a liquid drop. The ultrasound-assisted penetration and uniform forming device for freezing and printing a liquid drop comprises an array nozzle (2), a sand spreading device (1), an ultrasonic generator (3), a transducer (4), an amplitude transformer (5) and a low-temperature forming chamber (6). The ultrasonic generator uses a low-frequency ultrasonic wave of 20 KHz, and a nodal surface of the amplitude transformer is provided with a flange plate and is connected to an outer cavity wall of the low-temperature forming chamber by means of threads. An ultrasound-assisted penetration and uniform forming method for freezing and printing a liquid drop. In a sand spreading process, a frequency of an ultrasonic generator is adjusted to uniformly distribute pre-spread molding sand particles subjected to ultrasonic vibration; and when a pure water binder is sprayed, a liquid drop is sprayed to a surface of pre-mixed molding sand, and the liquid drop penetrates to the bottom of pre-cooled molding sand to freeze and solidify under the assistance of a low-frequency ultrasonic wave. By means of the method, sand mold freezing and 3D printing is carried out, the sand spreading is compact and uniform, liquid drop penetration is sufficient, and the forming precision of sand mold freezing and printing is accurate and controllable.

Classes IPC  ?

• B22C 9/02 - Moules en sable ou moules analogues pour pièces coulées
• B33Y 30/00 - Appareils pour la fabrication additive; Leurs parties constitutives ou accessoires à cet effet
• B33Y 10/00 - Procédés de fabrication additive
• B33Y 40/00 - Opérations ou équipements auxiliaires, p.ex. pour la manipulation de matériau

Abrégé

A method and a device for measuring a four-dimensional (4D) radiation pattern of an outdoor antenna based on an unmanned aerial vehicle (UAV) are provided. The device includes a measurement path planning unit, a UAV platform unit, a radiation signal acquisition unit, a data command processing unit, and a ground data processing unit. The measurement path planning unit, the radiation signal acquisition unit, and the data command processing unit each are suspended from the UAV platform unit by using a pod. The present disclosure applies to the radiation pattern measurement of an outdoor antenna.

Classes IPC  ?

• G08G 5/00 - Systèmes de commande du trafic aérien
• G05D 1/10 - Commande de la position ou du cap dans les trois dimensions simultanément
• G05D 1/00 - Commande de la position, du cap, de l'altitude ou de l'attitude des véhicules terrestres, aquatiques, aériens ou spatiaux, p.ex. pilote automatique

Abrégé

l median curve-skeleton concept of point cloud, extracting a medial axis from the point-cloud data of the fuselage component; uniformly sampling the medial axis into a plurality of skeleton points; extracting a discrete point set of a cross-section contour of the fuselage component; performing circle fitting on the discrete point set to obtain a fitted circle and parameters thereof; calculating a deformation displacement measurement indicator μ of the cross-section of the fuselage component to evaluate cross-section contour of the fuselage.

Classes IPC  ?

• G06F 30/15 - Conception de véhicules, d’aéronefs ou d’embarcations
• B64C 1/00 - Fuselages; Caractéristiques structurales communes aux fuselages, voilures, surfaces stabilisatrices ou organes apparentés

Abrégé

An electrowetting effect-based solar-driven high efficiency humidification system and a working method. A photovoltaic power generation module and an electrowetting high efficiency humidification module are combined, which conform to a solar energy transfer principle in a PV/T device, while liquid droplets are also sprayed at regular intervals on an upper surface of a heat exchange flow channel in the PV/T device, the principles of acceleration of liquid droplet internal flow and a change to surface hydrophilicity/hydrophobicity by electrowetting technology are used, liquid drop evaporation is accelerated, and highly efficient humidification of air is achieved. By means of coupled utilization of electrowetting technology and a PV/T system, water is saved while a large amount of moist air and clean electric energy which can be used for actual production are obtained.

Classes IPC  ?

• F24F 6/08 - Humidification de l'air par évaporation d'eau dans l'air en utilisant des éléments humides chauffés
• F24F 3/14 - Systèmes de conditionnement d'air dans lesquels l'air conditionné primaire est fourni par une ou plusieurs stations centrales aux blocs de distribution situés dans les pièces ou enceintes, blocs dans lesquels il peut subir un traitement secondaire; Appareillage spécialement conçu pour de tels systèmes caractérisés par le traitement de l'air autrement que par chauffage et refroidissement par déshumidification

Abrégé

A subtle defect detection method based on coarse-to-fine strategy, including: (S1) acquiring data of an image to be detected via a charge-coupled device (CCD) camera; (S2) constructing a defect area location network and preprocessing the image to be detected to initially determine a defect position; (S3) constructing a defect point detection network; and training the defect point detection network by using a defect segmentation loss function; and (S4) subjecting subtle defects in the image to be detected to quantitative extraction and segmentation via the defect point detection network.

Classes IPC  ?

• G06T 7/00 - Analyse d'image
• G06T 7/73 - Détermination de la position ou de l'orientation des objets ou des caméras utilisant des procédés basés sur les caractéristiques

Abrégé

A virtual strain energy-based metal material multi-axis fatigue life prediction method and system, belonging to the field of life prediction of metal materials for additive manufacturing. The method comprises: carrying out finite element analysis on a metal component, determining a dangerous point, and solving a stress-strain load-time history at the dangerous point; calculating shear strain energy in each plane passing the dangerous point, taking the plane having the maximum shear strain energy as a critical plane, and obtaining the shear strain energy and a multi-axis stress ratio on the critical plane; and calculating virtual strain energy at the dangerous point and using a shear strain energy life curve under a torsion load to perform life prediction, the virtual strain energy being strain energy obtained after normalization processing is performed on shear strain energy in the shear strain energy life curve under a single-axis tension-compression load and the torsion load. The method considers the influences of a load path on damage parameter coefficients and exponents at the same time, simply determines parameters, and can be suitable for fatigue life analysis of low-cycle and high-cycle fatigues under different load paths at the same time.

Classes IPC  ?

• G06F 30/17 - Conception mécanique paramétrique ou variationnelle

Abrégé

The embodiments of the present application relate to the technical field of electronics. Provided are a switched capacitor converter (SC) and an electronic device, which can freely switch various buck ratios. In the SC, a first end of a first switched circuit is connected to a power supply end, a second end of the first switched circuit is connected to a first end of a third capacitor, a third end of the first switched circuit is connected to a first end of a second switched circuit and a first end of a first capacitor, a fourth end of the first switched circuit is connected to a first end of a second capacitor, and a fifth end of the first switched circuit is connected to a first end of a third switched circuit, a first end of a fourth switched circuit and a first end of a fourth capacitor; a second end of the third capacitor is connected to a second end of the second switched circuit, and a third end of the second switched circuit is grounded; and a second end of the second capacitor is connected to a second end of the third switched circuit, a third end of the third switched circuit is grounded, a second end of the first capacitor is connected to a second end of the fourth switched circuit, a third end of the fourth switched circuit is grounded, and a second end of the fourth capacitor is grounded.

Classes IPC  ?

• H02M 3/158 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu sans transformation intermédiaire en courant alternatif par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs avec commande automatique de la tension ou du courant de sortie, p.ex. régulateurs à commutation comprenant plusieurs dispositifs à semi-conducteurs comme dispositifs de commande finale pour une charge unique

Abrégé

Provided in the present invention is a helicopter rotor manipulation device based on the pitch varying of a hydraulic torsion tube. The helicopter rotor manipulation device comprises a blade structure, a variable-pitch clamp system and a hydraulic system. The blade structure comprises blades, clamps and a rotor hub, which are connected in sequence by fasteners, wherein the rotor hub is connected to a rotor spindle. In the variable-pitch clamp system, a variable-pitch sleeve is located between a fixed rotor clamp and a rotating rotor clamp, an outer end face of the variable-pitch sleeve is fixedly connected to the rotating rotor clamp, and an inner end face of the variable-pitch sleeve is fixedly connected to the fixed rotor clamp. When the pressure inside the variable-pitch sleeve changes, a torsion angle generated at two ends of the variable-pitch sleeve drives the rotating rotor clamp to be angularly displaced, such that the angle of attack of the blades is controlled. The present invention uses a design having no auto-bank unit, such that the structure is simplified, and the reliability of a rotor system is improved. Meanwhile, the number of manipulation structures can also be reduced, thereby reducing the weight of the structure and maintenance costs, and further improving the reliability of a helicopter.

Classes IPC  ?

• B64C 11/38 - Mécanismes de changement de pas des pales par fluide, p.ex. hydrauliques

Abrégé

The present invention relates to a distributed pumped two-phase cooling system for an aircraft. In the cooling system, a liquid storage tank, a precooling device, a pump, a flow meter, a preheater, a first valve group, a heat source group, a condensing device, a reheater, and the liquid storage tank are successively connected, and a first sensor group is arranged on the liquid storage tank; a second sensor group is arranged between the precooling device and the pump, and a third sensor group is arranged between the preheater and the first valve group; a fifth sensor group is arranged on the heat source group; a sixth sensor group and a seventh sensor group are both arranged between the heat source group and the condensing device; a fourth sensor group is arranged between the reheater and the liquid storage tank, and a controller is connected to the sensor groups, the precooling device, the pump, the preheater, the reheater, the first valve group, and the condensing device, respectively. The present invention can solve the problem of collaborative heat dissipation of aircraft-borne apparatuses.

Classes IPC  ?

• H05K 7/20 - Modifications en vue de faciliter la réfrigération, l'aération ou le chauffage

Abrégé

A method is provided for calculating gaseous diffusion and oxidation evolution of a ceramic matrix composite (CMC) structure, which includes determining temperature and load distribution in a structural member; determining matrix crack distribution in the structure; establishing an equivalent diffusion coefficient model of a fiber bundle scale to predict a gas flow channel in a fiber bundle: averaging a total amount of gaseous diffusion in the channel to establish the equivalent diffusion coefficient model of the fiber bundle composite scale related to the matrix crack distribution; establishing a representative volume element (RVE) model; establishing an equivalent diffusion coefficient model of a RVE scale; calculating the distribution of the gas concentration and oxidation products in the structure; calculating a growth thickness of an oxide at cracks and pores in each element; and updating sealing conditions of the gas channel, and calculating a new equivalent diffusion coefficient field and the distribution of the oxidation products again.

Classes IPC  ?

• C04B 35/52 - Produits céramiques mis en forme, caractérisés par leur composition; Compositions céramiques; Traitement de poudres de composés inorganiques préalablement à la fabrication de produits céramiques à base de non oxydes à base de carbone, p.ex. graphite
• C04B 35/80 - Fibres, filaments, "whiskers", paillettes ou analogues
• C03C 10/00 - Verre dévitrifié ou vitrocéramiques, c. à d. verre ou céramiques ayant une phase cristalline dispersée dans la phase vitreuse et constituant au moins 50% en poids de la composition

Abrégé

The present invention belongs to the technical field of power electronics. Disclosed are a magnetic integrated matrix transformer and an isolated DC/DC converter. The magnetic integrated matrix transformer comprises a magnetic core, a primary winding, a secondary winding and a rectification unit, wherein the magnetic core is provided with a base; a middle column and at least three side columns are formed on the base; at least one secondary winding is wound on the magnetic core; each secondary winding is at least wound on two adjacent side columns; and the middle column is used for winding the primary winding. By means of the present invention, a secondary winding structure of a transformer is flexibly configured without changing a magnetic core, and any turn ratio of the transformer and the output of any number of paths of secondary sides are realized, such that the volume and weight of the transformer can be reduced, thereby increasing the power density of a converter; and the requirements of the converter for frequency ranges in different operating occasions can also be met, such that a magnetic part has flexibility and universality. Moreover, secondary windings of the transformer also have a current equalization effect when being arranged in an orthogonal manner, and a good heat dissipation effect can also be achieved using a metal shell wrapping the magnetic core.

Classes IPC  ?

• H01F 27/24 - Noyaux magnétiques
• H01F 27/30 - Fixation ou serrage de bobines, d'enroulements ou de parties de ceux-ci entre eux; Fixation ou montage des bobines ou enroulements sur le noyau, dans l'enveloppe ou sur un autre support
• H02M 3/22 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu avec transformation intermédiaire en courant alternatif

Abrégé

A multipath suppression method based on a steepest descent method includes stripping, according to carrier Doppler shift information fed back by a phase-locked loop, a carrier from an intermediate-frequency signal input into a tracking loop; constructing, on the basis of the autocorrelation characteristics of a ranging code, a quadratic cost function related to a measurement deviation of the ranging code, the cost function being not affected by a multipath signal; and finally, designing a new tracking loop of the ranging code according to the quadratic cost function and the principle of the steepest descent method, such that the loop has a multipath suppression function without increasing the computational burden. Compared with a narrow-distance correlation method, the current method reduces computing resources by ⅓, the design and adjustment of parameters are simple and feasible, a multipath suppression effect is superior, and a high engineering application value is obtained.

Classes IPC  ?

• H04B 1/18 - Circuits d'entrée, p.ex. pour le couplage à une antenne ou à une ligne de transmission
• H04B 1/10 - Dispositifs associés au récepteur pour limiter ou supprimer le bruit et les interférences
• G01S 19/30 - Acquisition ou poursuite des signaux émis par le système lié au code
• G01S 19/25 - Acquisition ou poursuite des signaux émis par le système faisant intervenir des données d'assistance reçues en provenance d'un élément coopérant, p.ex. un GPS assisté
• G01S 19/22 - Problèmes liés aux multitrajets

Abrégé

The present invention relates to an impact damage numerical simulation optimization method based on laser mapping of an entity grid, which method relates to the field of impact damage reproduction, impact damage tolerance and maintainability assessment of aero-engine blades. The method comprises: after a light-gas gun is used to fire a bullet to impact a sample grid area to obtain an impact damage, measuring an impact damage size, a damage contour, and a surface residual strain and a surface residual stress of an entity grid unit around the damage; establishing a parameterized impact finite element model, so as to obtain a numerically simulated impact damage size, a numerically simulated impact damage contour, and a numerically simulated surface residual strain and surface residual stress of the surface entity grid unit; calculating the relative errors between the impact damage size, the damage contour, the surface residual strain and the residual stress, which are actually measured in a test, and the impact damage size, the damage contour, the surface residual strain and the residual stress, which are numerically simulated; and determining whether each relative error is smaller than an expected value until a numerical simulation result meeting a precision requirement is obtained. By means of the present invention, the numerical simulation precision problem of impact damage geometry and internal residual stress is solved.

Classes IPC  ?

• G06F 30/23 - Optimisation, vérification ou simulation de l’objet conçu utilisant les méthodes des éléments finis [MEF] ou les méthodes à différences finies [MDF]

Abrégé

An intelligent data and knowledge-driven method for modulation recognition includes the following steps: collecting spectrum data; constructing corresponding attribute vector labels for different modulation schemes; constructing and pre-training an attribute learning model based on the attribute vector labels for different modulation schemes; constructing and pre-training a visual model for modulation recognition; constructing a feature space transformation model, and constructing an intelligent data and knowledge-driven model for modulation recognition based on the attribute learning model and the visual model; transferring parameters of the pre-trained visual model and the pre-trained attribute learning model and retraining the transformation model; and determining whether training on a network is completed and outputting a classification result. The intelligent data and knowledge-driven method for modulation recognition significantly improves the recognition accuracy at low SNRs and reduces the confusion between higher-order modulation schemes.

Classes IPC  ?

• H04L 27/00 - Systèmes à porteuse modulée
• G06N 3/08 - Méthodes d'apprentissage
• G06N 5/02 - Représentation de la connaissance; Représentation symbolique

Abrégé

The present invention provides a method and device for forming a continuous fiber composite material by combining additive and subtractive manufacturing. According to the present invention, a resin filament and a continuous fiber are fed into a printing head and are melt and deposited, to first form a continuous fiber reinforced composite material by additive manufacturing by means of melt deposition forming; and after forming is completed, size and morphology data acquisition is performed to obtain the actual size of a part; a subtractive path is planned, and subtractive forming is carried out by a laser. According to the present invention, additive and subtractive forming is used for the continuous fiber composite material, additive forming is carried out by means of melt deposition, laser subtractive machining is performed, so that a device structure is simplified, machining stress and mechanical deformation are reduced, three-dimensional measurement and subtractive planning are carried out on the part, the automation degree is improved, and forming precision of the part made of the continuous fiber composite material is comprehensively improved.

Classes IPC  ?

• B29C 64/112 - Procédés de fabrication additive n’utilisant que des matériaux liquides ou visqueux, p.ex. dépôt d’un cordon continu de matériau visqueux utilisant des gouttelettes individuelles, p.ex. de buses de jet
• B29C 64/386 - Acquisition ou traitement de données pour la fabrication additive
• B29C 64/118 - Procédés de fabrication additive n’utilisant que des matériaux liquides ou visqueux, p.ex. dépôt d’un cordon continu de matériau visqueux utilisant un matériau filamentaire mis en fusion, p.ex. modélisation par dépôt de fil en fusion [FDM]
• B29C 64/20 - Fabrication additive, c. à d. fabrication d’objets en trois dimensions [3D] par dépôt additif, agglomération additive ou stratification additive, p.ex. par impression en 3D, stéréolithographie ou frittage laser sélectif - Détails ou accessoires à cet effet
• B33Y 10/00 - Procédés de fabrication additive
• B33Y 50/00 - Acquisition ou traitement de données pour la fabrication additive
• B33Y 30/00 - Appareils pour la fabrication additive; Leurs parties constitutives ou accessoires à cet effet

Abrégé

The present application provides an actuator, a driving apparatus, a camera module, and an electronic device. The actuator comprises a metal plate, a first piezoelectric ceramic, and a second piezoelectric ceramic. The metal plate comprises a vibrating portion and a connecting portion. The vibrating portion is connected to a peripheral side surface. The first piezoelectric ceramic is fixed to the top surface, and the second piezoelectric ceramic is fixed to the bottom surface. The polarization direction of the first piezoelectric ceramic and the polarization direction of the second piezoelectric ceramic are the same as a direction in which the second piezoelectric ceramic, the metal plate, and the first piezoelectric ceramic are stacked. The top surface of the first piezoelectric ceramic and the bottom surface of the second piezoelectric ceramic are used for be electrically connected to a first electrode end of a power supply. The bottom surface of the first piezoelectric ceramic and the top surface of the second piezoelectric ceramic are used for being electrically connected to a second electrode end of the power supply. The actuator of the present application has a simple excitation structure.

Classes IPC  ?

• H02N 2/02 - Machines électriques en général utilisant l'effet piézo-électrique, l'électrostriction ou la magnétostriction produisant un mouvement linéaire, p.ex. actionneurs; Positionneurs linéaires

Abrégé

A wearable cable-driven robotic arm system includes a wearing mechanism, two robotic arms located on two sides of the wearing mechanism, cable driving devices, a load trolley, and a motor controller, where the cable driving devices are divided into driving portions and driven portions, heavy objects, such as electric motors, of the driving portions are arranged in the load trolley, thereby reducing loads born by the wearable robotic arms, the load trolley can travel with a person by means of sleeves or can be controlled by the motor controller to move by means of signals measured by following modules, the driven portions are combined with the robotic arms, and are double-cable driven, thereby reducing weight of the robotic arms, and a brain-computer interface module is used for controlling the driving devices, thereby controlling the robotic arms more accurately.

Classes IPC  ?

• B25J 9/00 - Manipulateurs à commande programmée
• B25J 17/02 - Joints articulés
• B25J 18/04 - Bras extensibles rotatifs
• B25J 13/08 - Commandes pour manipulateurs au moyens de dispositifs sensibles, p.ex. à la vue ou au toucher
• B25J 9/10 - Manipulateurs à commande programmée caractérisés par des moyens pour régler la position des éléments manipulateurs

Abrégé

A free-bending forming apparatus for a tubular component using differential temperatures and a method thereof are disclosed. The apparatus includes an isothermal heating device and a heating device for the differential temperatures. The isothermal heating device is configured to preheat an inside and an outside of a bending section of the tubular component to a predetermined temperature to form a preheated bending section before bending and forming. The heating device for the differential temperatures is configured to heat the inside and the outside of the preheated bending section of the tubular component respectively to different temperatures, and the temperature at the outside is higher than that at the inside. The heating device for the differential temperatures is provided between a pressing device and a guiding mechanism, and the isothermal heating device is provided between the pressing device and the heating device for the differential temperatures.

Classes IPC  ?

• B21D 37/16 - Chauffage ou refroidissement
• B21D 7/06 - Cintrage des barres, profilés ou tubes dans des presses particulières ou entre des marteaux et des enclumes ou des butées; Pinces comportant des matrices de formage

Abrégé

bfthbthfthbb; establishing a creep damage constitutive model, which comprises a strain rate formula and a damage rate formula; obtaining, by means of solution, an evolution behavior of a strain deformation over time; and obtaining, by means of solution, an evolution behavior of damage over time. In the method, modeling is performed for creep average deformation and damage behaviors under the same condition, and the situation of a median under the condition is represented. In the method, parameters have a clear stress-temperature correlation relationship, such that the disadvantage of a traditional creep damage constitutive model being difficult to extrapolate is overcome, and the accurate extrapolation can be realized; and the method has high prediction precision.

Classes IPC  ?

• G01N 3/18 - Exécution de tests à des températures élevées ou basses

Abrégé

A coaxial powder-feeding nozzle includes a partition wall-type shell, a powder flow area, a cooling liquid flow area and a shielding gas conveying channel. A powder self-cleaning filter is on the outer side of the partition wall-type shell; the powder self-cleaning filter includes a set of powder collecting tubes on each side of the partition wall-type shell in the axial direction; each set of powder collecting tubes includes at least one powder collecting tube; under the coaction of a suction force applied by a powder collecting system and the self-weight of residual powder, a residual powder inlet of each powder collecting tube causes the residual powder on the opposite side to roll down to the bottom along the wall surface of a metal tube to be processed on the same side, and to be gathered at the front end of the residual powder inlet of the powder collecting tube.

Classes IPC  ?

• B22F 12/53 - Buses
• B33Y 30/00 - Appareils pour la fabrication additive; Leurs parties constitutives ou accessoires à cet effet
• B29C 64/35 - Nettoyage
• B29C 64/209 - Têtes; Buses

Abrégé

Disclosed is a method for predicting creep damage and deformation evolution behavior with time, which comprises the following steps: obtaining tensile strength σb through high-temperature tensile test; obtaining the strain curve, minimum creep rate {dot over (ε)}m and life tƒ through creep test; obtaining the threshold stress σth at different temperatures; establishing the relationship between the tensile strength σb, the threshold stress σth and the temperature T; establishing the prediction formulas of the minimum creep rate σth and creep life σb based on the threshold stress {dot over (ε)}m and the tensile strength tƒ; establishing a creep damage constitutive model, including strain rate formula and damage rate formula; obtaining the evolution behavior of strain and deformation with time; obtaining the evolution behavior of damage with time.

Classes IPC  ?

• G01N 3/08 - Recherche des propriétés mécaniques des matériaux solides par application d'une contrainte mécanique par application d'efforts permanents de traction ou de compression
• G01N 3/02 - Recherche des propriétés mécaniques des matériaux solides par application d'une contrainte mécanique - Parties constitutives

Abrégé

Disclosed are a drive-by-wire chassis cyber-physical system under an intelligent traffic environment and a control method. The system includes: an SoS-level CPS, a system-level CPS, and a unit-level CPS, data transmission is realized between a plurality of unit-level CPSs and one system-level CPS, and data transmission is realized between a plurality of system-level CPSs and one SoS-level CPS. The system integrates a hub motor with a suspension, cancels traditional structures such as an engine and a clutch, and simplifies the structure of a chassis. A motor directly drives a vehicle to run, and different driving, braking or torque is applied to different wheels through four hub motors, so as to meet independent control of the wheels and improve active safety and operational stability.

Classes IPC  ?

• B60W 50/12 - Limitation de la possibilité de commande du conducteur en fonction de l'état du véhicule, p.ex. moyens de verrouillage des grandeurs d'entrées pour éviter un fonctionnement dangereux
• B60W 40/09 - Style ou comportement de conduite
• B60W 50/10 - Interprétation des requêtes ou demandes du conducteur

Abrégé

An active helicopter noise suppression apparatus integrating an acoustic array and in-blade control. The apparatus comprises an annular loudspeaker array (101), a plurality of force exciters (102), an error microphone (103), an active noise cancellation (ANC) controller (104), a cockpit sensor (105) and an onboard computer (106). By means of providing the annular loudspeaker array (101) on a rotor blade hub and arranging the unsteady force exciters (102) on the rear edges of blades, a sound field, the sound waves in which are in an inverted phase with respect to an original sound field, is constructed by using the ANC control principle, such that noise is canceled, thereby achieving noise cancellation of universal helicopter noises of all types.

Classes IPC  ?

• G06F 30/15 - Conception de véhicules, d’aéronefs ou d’embarcations
• G06F 30/28 - Optimisation, vérification ou simulation de l’objet conçu utilisant la dynamique des fluides, p.ex. les équations de Navier-Stokes ou la dynamique des fluides numérique [DFN]
• G10K 11/178 - Procédés ou dispositifs de protection contre le bruit ou les autres ondes acoustiques ou pour amortir ceux-ci, en général utilisant des effets d'interférence; Masquage du son par régénération électro-acoustique en opposition de phase des ondes acoustiques originales
• G06F 119/10 - Analyse du bruit ou optimisation du bruit

Abrégé

A method for estimating the thermal conductivity coefficient of a carbon fiber toughened ceramic matrix composite material under high-temperature oxidation, the method comprising: obtaining a geometric structural characteristic change rule for when the material is oxidized, and introducing oxidation gap depth characteristics into an RVE model to obtain a modified RVE model containing oxidation characteristics; dividing the modified RVE model into five characteristic areas along the axial direction of the fiber, respectively establishing an equivalent axial thermal resistance for each characteristic area, connecting in series the axial thermal resistances of the five areas so as to obtain an overall axial thermal resistance network of the material, and solving to obtain an axial thermal conductivity coefficient; performing similar area division in the modified RVE model to solve for a transverse thermal conductivity coefficient. The thermal conductivity coefficient of the material can thus be predicted under different oxidation temperature and oxidation time conditions.

Classes IPC  ?

• G06F 30/20 - Optimisation, vérification ou simulation de l’objet conçu

Abrégé

An aircraft cockpit heating system, comprising a lubricating oil system and a vapor cycle system. The vapor cycle system comprises a heat exchanger (2) and a refrigerant-lubricating oil heat exchanger (3), wherein the heat exchanger is arranged in a cockpit (1); an inlet of the heat exchanger is in communication with a refrigerant outlet of the refrigerant-lubricating oil heat exchanger; a refrigerant inlet of the refrigerant-lubricating oil heat exchanger is in communication with an outlet of the heat exchanger; an oil inlet of the refrigerant-lubricating oil heat exchanger is in communication with an oil outlet of the lubricating oil system; and an oil inlet of the lubricating oil system is in communication with an oil outlet of the refrigerant-lubricating oil heat exchanger. The system can reduce aircraft fuel consumption, increase the fuel utilization rate and reduce carbon emissions.

Classes IPC  ?

• B64D 13/08 - Aménagements ou adaptations des appareils de conditionnement d'air pour équipages d'aéronefs, passagers ou pour emplacement réservé au fret l'air étant climatisé l'air étant réchauffé ou refroidi
• F25B 41/40 - Agencements de conduites de fluide

Abrégé

Disclosed are a thermal infrared vision-based parking apron human body action recognition method and system. The method comprises: obtaining a plurality of video sequences from an infrared monitoring video; performing target frame labeling on a set target in each image frame in the video sequences; for each image frame in the video sequences, capturing an enlarged region of a target frame according to the labeled target frame; adding position information of labeled images of the target frames to the enlarged regions of the target frames to obtain three-way channel sub-images; the three-way channel sub-images forming a three-way channel sub-image sequence according to a time sequence; training an action recognition model by using the three-way channel sub-image sequence corresponding to the plurality of video sequences as a training set; obtaining from the infrared monitoring video a video sequence to be recognized, and obtaining a three-way channel sub-image sequence corresponding to the video sequence to be recognized; and inputting the three-way channel sub-image sequence corresponding to the video sequence to be recognized into the trained action recognition model to output a target action type. In the present invention, the recognition precision of human body actions in a complex environment is improved.

Classes IPC  ?

• G06V 40/20 - Mouvements ou comportement, p.ex. reconnaissance des gestes

Abrégé

A method for jointly estimating gain-phase error and direction of arrival (DOA) based on an unmanned aerial vehicle (UAV) array includes: equipping each UAV with an antenna, and forming a receive array through a swarm of multiple UAVs to receive source signals; when an observation baseline of the swarm remains unchanged, changing array manifold through movement of the UAVs, and re-sensing the source signals; for each sensed source signals, calculating a covariance matrix, and obtaining a corresponding noise subspace through eigenvalue decomposition; and constructing a quadratic optimization problem based on the noise subspace and array steering vector, constructing a cost function, and implementing joint estimation of the gain-phase error and the DOA through spectrum peak search. The method can jointly estimate the DOA and gain-phase error and calibrate the gain-phase error, thereby improving accuracy of passive positioning.

Classes IPC  ?

• G01S 3/14 - Systèmes pour déterminer une direction ou une déviation par rapport à une direction prédéterminée
• G01S 3/02 - Radiogoniomètres pour déterminer la direction d'où proviennent des ondes infrasonores, sonores, ultrasonores ou électromagnétiques ou des émissions de particules sans caractéristiques de direction utilisant des ondes radio

Abrégé

Disclosed is an anti-deadlock dispatching method for an OHT system. Firstly, when an OHT system satisfies a task allocation triggering condition, system information is acquired; secondly, whether a set of idle vehicles and a set of tasks to be allocated of the system are empty is determined, and when the set of idle vehicles and the set of tasks to be allocated are not empty, task allocation is completed according to a task scheduling method; thirdly, on the basis of an order of tasks in a task allocation scheme, path planning is performed on the tasks in sequence by using an online path planning method; according to an allocated task and a planned path, a vehicle starts to execute the task, and performs collision avoidance according to a traffic management and control strategy; finally, when the vehicle completes the task, the idle vehicle is dispatched according to an anti-congestion strategy, and a system state is updated. This method solves the problems in the prior art of low system efficiency and poor punctuality caused by neglecting the coupling relationship among task scheduling, traffic management and control, and path planning, and improves the overall efficiency of the system.

Classes IPC  ?

• G05B 19/418 - Commande totale d'usine, c.à d. commande centralisée de plusieurs machines, p.ex. commande numérique directe ou distribuée (DNC), systèmes d'ateliers flexibles (FMS), systèmes de fabrication intégrés (IMS), productique (CIM)

Abrégé

A high supersonic aircraft leading edge thermal protection design method based on a three-dimensional orthogonal woven composite material, belonging to the technical field of engineering thermophysics, and can effectively reduce the leading edge temperature while not increasing cooling measures. In the method, first, establishing a multivariable linear regression model, and finding a theoretical optimization heat conduction configuration of the leading edge, such that the temperature of a leading edge part is effectively reduced; second, establishing a general calculation formula suitable for calculating anisotropic thermal conductivity coefficients of different woven structures of a three-dimensional orthogonal woven ceramic matrix composite material, and the general calculation formula being used for guiding a mesoscopic woven structure of the three-dimensional orthogonal woven ceramic matrix composite material; finally, directly combining the optimization result obtained by the multivariable linear regression model with the general formula, so as to design the mesoscopic weaving structures required by different areas, thereby achieving collaborative design of the leading edge macroscopic temperature optimization and the mesoscopic weaving structure of the three-dimensional orthogonal woven ceramic matrix composite material.

Classes IPC  ?

• G06F 30/15 - Conception de véhicules, d’aéronefs ou d’embarcations
• G06F 30/23 - Optimisation, vérification ou simulation de l’objet conçu utilisant les méthodes des éléments finis [MEF] ou les méthodes à différences finies [MDF]
• G06F 113/26 - Composites
• G06F 119/08 - Analyse thermique ou optimisation thermique

Abrégé

A brain-inspired cognitive learning method can obtain good learning results in various environments and tasks by selecting the most suitable algorithm models and parameters based on the environments and tasks, and can correct wrong behavior. The framework includes four main modules: a cognitive feature extraction module, a cognitive control module, a learning network module, and a memory module. The memory module includes a data base, a cognitive case base, and an algorithm and hyper-parameter base, which store data of dynamic environments and tasks, cognitive cases, and concrete algorithms and hyper-parameter values, respectively. For dynamic environments and tasks, the most suitable algorithm model and hyper-parameter combination can be flexibly selected. In addition, with “good money drives out bad”, mislabeled data is corrected using correctly labeled data, to achieve robustness of training data.

Classes IPC  ?

• G06N 3/0985 - Optimisation d’hyperparamètres; Meta-apprentissage; Apprendre à apprendre

Abrégé

The present invention relates to the field of new concept unsteady combustion. Disclosed are an isolated section shock wave forward propagation suppression structure for an internal combustion wave rotor, and an internal combustion wave rotor. The isolated section shock wave forward propagation suppression structure for an internal combustion wave rotor comprises a wave rotor and a gas inlet port; a sealing disc is provided on the end of the gas inlet port facing the wave rotor; an end portion of the wave rotor closely contacts the sealing disc; the sealing disc is provided with a fan-shaped hole; the wave rotor is provided with a plurality of wave rotor channels; an isolated section sleeve is provided in the gas inlet port; a pneumatic valve is provided in the isolated section sleeve; the pneumatic valve has two valve plates; free ends of the two valve plates are provided facing the wave rotor and are far away from each other; and when the wave rotor rotates, the plurality of wave rotor channels are sequentially communicated with the isolated section sleeve through the fan-shaped hole. The present invention implements the suppression of reflected shock waves by changing a flow blockage ratio and the shape of a pneumatic valve to deplete back propagation pressure, thereby facilitating a fuel inlet process, and implementing stable work of an internal combustion wave rotor under a state of departing from a design point.

Classes IPC  ?

• F02C 3/14 - Ensembles fonctionnels de turbines à gaz caractérisés par l'utilisation de produits de combustion comme fluide de travail caractérisés par l'aménagement de la chambre de combustion dans l'ensemble
• F02C 7/04 - Entrées d'air pour ensembles fonctionnels de turbines à gaz ou de propulsion par réaction
• F02C 7/22 - Systèmes d'alimentation en combustible
• F23R 3/28 - Chambres de combustion à combustion continue utilisant des combustibles liquides ou gazeux caractérisées par l'alimentation en combustible

Abrégé

A multifunctional electric recirculating ball steering system for commercial vehicles and its control method are described. The system comprises three modules: an electric power module, a mechanical transmission module, and a control module. The system introduces a dual-rotor motor and a common power motor, working together to act on the input end of a recirculating ball steering gear. The dual-rotor motor offers high redundancy, increased output torque, and improved reliability for control-by-wire operations. A fork assembly enables synchronous and asynchronous rotation of the dual rotors, achieving both steer-by-wire and electric power steering functions. Leveraging the high reduction ratio capability of the recirculating ball steering gear maximizes power torque and simplifies the system architecture while ensuring reliability in both traditional control and control-by-wire functionalities.

Classes IPC  ?

• B62D 3/08 - Boîtiers de direction mécaniques du type à vis sans fin à vis et écrou utilisant des billes intermédiaires ou des éléments analogues
• B62D 5/04 - Direction assistée ou à relais de puissance électrique, p.ex. au moyen d'un servomoteur relié au boîtier de direction ou faisant partie de celui-ci
• B62D 15/02 - Indicateurs de direction ou aides de direction
• H02K 7/06 - Moyens de transformation d'un mouvement alternatif en un mouvement circulaire ou vice versa
• H02K 7/08 - Association structurelle avec des paliers
• H02K 16/02 - Machines avec un stator et deux rotors

Abrégé

An interlayer pre-cooling apparatus for a sand mold freezing printing includes a sand paving apparatus. The sand paving apparatus is located above a negative-pressure low-temperature forming chamber, and the sand paving apparatus includes several independent sand paving grooves, a hollow sand paving roller, a cooling chamber, a sand scraping plate, and an openable and closable baffle. The openable and closable baffle is rotationally arranged at a discharge port of each sand paving apparatus, and the openable and closable baffle is used for paving low temperature premixed sand on demand. The premixed molding sand is further cooled during the process of scraping and compacting low-temperature molding sand. When the apparatus is adopted for sand mold freezing 3D printing, the low temperature of the premixed molding sand is precisely controllable, which has great significance for realizing interlayer pre-cooling of the sand mold freezing printing.

Classes IPC  ?

• B22C 9/02 - Moules en sable ou moules analogues pour pièces coulées
• B33Y 30/00 - Appareils pour la fabrication additive; Leurs parties constitutives ou accessoires à cet effet
• B28B 1/00 - Fabrication d'objets façonnés à partir du matériau
• B33Y 40/00 - Opérations ou équipements auxiliaires, p.ex. pour la manipulation de matériau

Abrégé

A high-torque and high-precision ultrasonic motor with a self-protection function and an implementation mode of the high-torque and high-precision ultrasonic motor are provided. In the device, a gasket encloses an output shaft of an ultrasonic motor body. A harmonic reducer encloses a shell of the ultrasonic motor body. A motor shaft penetrates through the ultrasonic motor body. The end, close to the motor shaft, of the ultrasonic motor body is defined as a top end, and the bottom end of the motor shaft is sequentially enclosed with an encoder support and a high-precision encoder assembly. The gasket, the harmonic reducer, the encoder support and the high-precision encoder assembly are sequentially arranged from the ultrasonic motor body to the bottom end of the motor shaft. After the ultrasonic motor body decelerates and increases torque, the motor shaft outputs rotating speed and torque.

Classes IPC  ?

• H02N 2/12 - Machines électriques en général utilisant l'effet piézo-électrique, l'électrostriction ou la magnétostriction produisant un mouvement rotatif, p.ex. moteurs rotatifs - Détails de structure
• H02N 2/00 - Machines électriques en général utilisant l'effet piézo-électrique, l'électrostriction ou la magnétostriction
• H02N 2/14 - Circuits d'entraînement; Dispositions pour la commande
• H02N 2/16 - Machines électriques en général utilisant l'effet piézo-électrique, l'électrostriction ou la magnétostriction produisant un mouvement rotatif, p.ex. moteurs rotatifs utilisant des ondes progressives

Abrégé

An electro-hydraulic integrated steering system and a multi-parameter coupling optimization method thereof. The electro-hydraulic integrated steering system comprises a mechanical transmission module, an electric power assisted module, a hydraulic power assisted module, and a control module. A design scheme in which the electric power assisted mechanism is integrated at the bottom of an original hydraulic system steering gear, an original worm gear and worm speed reducer is replaced with a planetary gear speed reducer (18), and a mechanical rotary valve structure in an original hydraulic power assisted mechanism is reserved is adopted. On one hand, the electric and hydraulic mechanisms are highly integrated, and energy consumption can be reduced by the cooperative operation; on the other hand, the road surface information can be fed back in real time, thereby providing clear road feel for a driver. In addition, the system further has the advantages that a plurality of execution mechanisms are redundant with each other, the planetary gear speed reducer (18) eliminates the hidden danger of system jamming, low failure rate of the mechanical rotary valve structure is reserved, etc., and multi-parameter coupling optimization is performed on the system, so that the system economy can be maximized while the cost, reliability and road feel are guaranteed.

Classes IPC  ?

• B62D 5/06 - Direction assistée ou à relais de puissance à fluide, c. à d. au moyen d'un fluide sous pression produisant toute la force nécessaire, ou la plus grande partie de celle-ci, pour commander la direction du véhicule
• B62D 5/04 - Direction assistée ou à relais de puissance électrique, p.ex. au moyen d'un servomoteur relié au boîtier de direction ou faisant partie de celui-ci
• B62D 6/00 - Dispositions pour la commande automatique de la direction en fonction des conditions de conduite, qui sont détectées et pour lesquelles une réaction est appliquée, p.ex. circuits de commande
• B62D 3/02 - Boîtiers de direction mécaniques

Abrégé

A method for automatically processing a structure-reinforcing member of an aircraft, including: (S1) acquiring, by a handheld laser scanner, data of an area to be reinforced of the aircraft; (S2) controlling a robotic arm to automatically grab the reinforcing member for automatic scanning; (S3) setting a cutting path in a computer aided design (CAD) digital model followed by registration with real data to obtain an actual cutting path, and cutting the reinforcing member; (S4) controlling the robotic arm to guide a cut reinforcing member to a scanning area for automatic scanning; and (S5) subjecting point cloud data of the cut reinforcing member and the area to be reinforced to virtual assembly and calculating a machining allowance to determine whether an accuracy requirement is met; if yes, ending a task; otherwise, grinding the reinforcing member automatically, and repeating steps (S4)-(S5).

Classes IPC  ?

• B25J 9/16 - Commandes à programme
• B25J 11/00 - Manipulateurs non prévus ailleurs

Abrégé

A method for detecting defects of an aircraft template, including: scanning the template; establishing a local coordinate system of a template point cloud; fitting plane parameters of a target local point cloud; acquiring an average of normal vectors of all points; calculating heights of all points; calculating an angle between a normal vector of the sinking point and a normal vector of the template point cloud plane; binarizing a point cloud image of the template; obtaining a 3D digital model of the template; aligning the 3D digital model with a resulting point cloud; and determining whether an actual distance exceeds a preset distance threshold, if not, the template is qualified, otherwise, determining whether the number of points whose actual distance exceeds the preset distance threshold exceeds a preset number threshold; if not, the template is qualified; otherwise, the template is not qualified. A detection device is also provided.

Classes IPC  ?

• G06F 30/15 - Conception de véhicules, d’aéronefs ou d’embarcations
• G06F 30/20 - Optimisation, vérification ou simulation de l’objet conçu

Abrégé

Provided are an intelligent auxiliary power steering system using braking energy, and a control method, the system comprising: a torque sensor, a brake pedal, a brake pedal pressure sensor, a vehicle speed sensor, a steering wheel (1), a steering column assembly, a hydraulic power assisting apparatus, an auxiliary hydraulic power assisting apparatus, a plunger pump clutch apparatus, and a main controller. When braking occurs in a vehicle, the kinetic energy of the vehicle can be used to, by means of ground friction force, drive vehicle wheels to rotate, a transmission output shaft (20) can be driven to rotate by means of a vehicle transmission system, and a plunger pump (10) can be driven by means of the plunger pump clutch apparatus to pump hydraulic oil into a steering gear (3), thus, when braking occurs in the vehicle, the steering system can be provided with power assistance, power consumed by a motor is reduced, and energy is saved.

Classes IPC  ?

• B62D 5/06 - Direction assistée ou à relais de puissance à fluide, c. à d. au moyen d'un fluide sous pression produisant toute la force nécessaire, ou la plus grande partie de celle-ci, pour commander la direction du véhicule
• B62D 6/00 - Dispositions pour la commande automatique de la direction en fonction des conditions de conduite, qui sont détectées et pour lesquelles une réaction est appliquée, p.ex. circuits de commande
• B60T 7/06 - Disposition de la pédale
• B62D 101/00 - Vitesse du véhicule

Abrégé

A thermal analysis method for a ceramic matrix composite (CMC) turbine vane considering a micro-woven structure and a change of direction of fiber bundles: obtaining geometric characteristics of the fiber bundles of the internal woven structure of the CMC; establishing a micro-model of warp yarns and weft yarns of the woven structure and a CMC matrix; constructing a woven structural CMC turbine vane model with a micro-structure periodic width in a vane height direction; assigning an anisotropic thermal conductivity matrix varying with a vane profile; performing meshing; performing finite element calculation of a temperature field; and obtaining calculation results of the temperature field of the woven structural CMC turbine vane model, comparing the calculation results with calculation results based on a homogenization thermal analysis method for an equivalent thermal conductivity for analysis, and extracting and analyzing fluctuation characteristics of the temperature field of the woven structural CMC turbine vane.

Classes IPC  ?

• G06F 30/15 - Conception de véhicules, d’aéronefs ou d’embarcations
• G06F 30/23 - Optimisation, vérification ou simulation de l’objet conçu utilisant les méthodes des éléments finis [MEF] ou les méthodes à différences finies [MDF]

Abrégé

The present invention provides a radar target detection method based on estimation before detection (EBD), which comprises: obtaining pre-detect targets (PDTs) based on conventional pulse-Doppler processing and pre-detection; estimating ranges and speeds of PDTs, i.e., performing parameter EBD; establishing a dimension-reduction observation model of a received signal based on PDTs and parameter thereof; reconstructing a target vector in the dimension-reduction observation model based on a sparse recovery algorithm; and designing a generalized likelihood ratio detector based on the reconstruction result for target detection. The method of the present invention can significantly reduce the radar signal processing loss, and the target detector used in the method has the constant false alarm rate (CFAR) property, so that the weak target detection performance can be greatly improved.

Classes IPC  ?

• G01S 13/50 - Systèmes de mesure basés sur le mouvement relatif à la cible
• G01S 13/58 - Systèmes de détermination de la vitesse ou de la trajectoire; Systèmes de détermination du sens d'un mouvement

Abrégé

A chiral cell includes a cell structure. The cell structure includes an upper ring, a middle ring, a lower ring, upper connecting rods, and lower connecting rods. The upper ring and the lower ring have the same geometrical shape, and the middle ring is located between the upper ring and the lower ring. A plurality of upper connecting rods is provided; the two ends of each upper connecting rod are respectively correspondingly connected to the upper ring and the middle ring and the upper connecting rods are obliquely and uniformly distributed between the upper ring and the middle ring; a plurality of lower connecting rods is provided; the two ends of each lower connecting rod are respectively correspondingly connected to the lower ring and the middle ring and the lower connecting rods are obliquely and uniformly distributed between the lower ring and the middle ring.

Classes IPC  ?

• B32B 3/20 - Produits stratifiés caractérisés essentiellement par le fait qu'une des couches comporte des discontinuités ou des rugosités externes ou internes, ou bien qu'une des couches est de forme générale non plane; Produits stratifiés caractérisés essentiellement par des particularismes de forme caractérisés par une couche discontinue, c. à d. soit continue et percée de trous, soit réellement constituée d'éléments individuels caractérisés par une couche interne formée d'éléments individuels de pièces comportant des rainures ou des cavités
• B32B 3/14 - Produits stratifiés caractérisés essentiellement par le fait qu'une des couches comporte des discontinuités ou des rugosités externes ou internes, ou bien qu'une des couches est de forme générale non plane; Produits stratifiés caractérisés essentiellement par des particularismes de forme caractérisés par une couche discontinue, c. à d. soit continue et percée de trous, soit réellement constituée d'éléments individuels caractérisés par une couche de surface formée d'éléments individuels
• B32B 15/01 - Produits stratifiés composés essentiellement de métal toutes les couches étant composées exclusivement de métal
• B33Y 10/00 - Procédés de fabrication additive

Abrégé

A suspending release device for observing a drop vibration attitude change of a lander and a test method are provided. The device includes a bench system, a lifting system fixed to the bench system, a horizontal frame system, an attitude control system, and a suspending release system hinged to the attitude control system. The horizontal frame system may slide vertically on the bench system and may drive the attitude control system to slide horizontally. A test lander is fixed to a release sliding block. The release sliding block is locked with a main load bearing block. An attitude of the test lander when releasing is adjusted. The horizontal frame system is lifted to a predetermined height. Guide rods are indirectly driven to release the sliding block by a motor. The whole lander falls freely and touches the ground to collide, and the process is recorded by a high-speed camera.

Classes IPC  ?

• B64G 1/24 - Appareils de guidage ou de commande, p.ex. de commande d'assiette
• B64G 1/10 - Satellites artificiels; Systèmes de tels satellites; Véhicules interplanétaires
• B64G 1/36 - Appareils de guidage ou de commande, p.ex. de commande d'assiette par des capteurs, p.ex. par des capteurs solaires, des capteurs d'horizon
• B64G 1/64 - Systèmes pour réunir ou séparer des véhicules spatiaux ou des parties de ceux-ci, p.ex. aménagement pour l'accostage ou l'amarrage

Abrégé

A device and method for testing fracture toughness of a solid-ice interface on a surface of coating material in a large-scale freezing status are provided. The method uses the principle of single-cantilever beam loading, and utilizes the bending stress of a metal substrate to induce the generation and extension of micro-cracks at the solid-ice interface, which are intended to observe the fracture behavior at the interface between the surface of a coating material with metal as a substrate and the ice layer, so as to obtain the fracture toughness at the interface between the ice layer and the surface of the substrate.

Classes IPC  ?

• G01N 19/04 - Mesure de la force d'adhérence entre matériaux, p.ex. du ruban adhésif, d'un revêtement

Abrégé

The invention relates to the technical field of electrochemical machining and provides a pulse dynamic electrochemical machining apparatus and method for rapidly leveling a surface of a revolving part. During rotating pulse dynamic electrochemical machining, a cathode tool rotates around a center point of the cathode tool at a constant angular velocity, and an anode workpiece rotates around a center point of the anode workpiece at the constant angular velocity; meanwhile, the cathode tool performs a feed movement at a set feed velocity along a center line of the cathode tool and the anode workpiece. A control system determines a machining voltage value output by a power source when each contour point of the anode workpiece rotates to a machining area to automatically change an applied voltage between the cathode tool and the anode workpiece.

Classes IPC  ?

• B23H 3/02 - Circuits électriques spécialement adaptés à cet effet, p.ex. alimentation, commande, prévention des courts-circuits
• B23H 3/04 - Electrodes spécialement adaptées à cet effet ou leur fabrication

Abrégé

A high-temperature biaxial strength tester for a CMC turbine vane includes a test stand, a thermal insulation box, a vane fixture, a biaxial loading device, thermocouples, a multi-channel thermometer, quartz lamps, a digital image correlation (DIC) system, and a cooling circulation system. The biaxial loading device includes two loading mechanisms arranged at 90° to each other. Each of the two loading mechanisms includes an electric cylinder and a ceramic push rod. One end of the ceramic push rod is connected to the electric cylinder, and the other end of the ceramic push rod extends into the thermal insulation box to contact an outer platform of the CMC turbine vane. The electric cylinder is provided with a load-displacement sensor. The thermocouples are arranged on the thermal insulation box. The quartz lamps are arranged inside the thermal insulation box. The multi-channel thermometer is connected to the thermocouples.

Classes IPC  ?

• G01K 13/00 - Thermomètres spécialement adaptés à des fins spécifiques
• G01M 13/00 - Test des pièces de machines
• G01K 13/02 - Thermomètres spécialement adaptés à des fins spécifiques pour mesurer la température de fluides en mouvement ou de matériaux granulaires capables de s'écouler

Abrégé

A circumferential helical water groove cooling apparatus used for enhancing the heat transfer of a gearbox, comprising a cylindrical outer casing (1). A water inlet (11) and a water outlet (12) are provided on the surface of the outer casing (1), and an inner casing (2) of the gearbox is arranged inside the outer casing (1). The outer surface of the inner casing (2) of the gearbox is fitted with the inner surface of the outer casing (1), and the outer surface of the inner casing (2) of the gearbox is provided with helical fins (24) along the extending direction of the inner casing (2) of the gearbox. The space between adjacent fins (24) is a water groove (21), and the water groove (21) communicates with the water inlet (11) and the water outlet (12). A turbulent flow structure (22) is arranged in the water groove (21) on the side close to the water outlet (12). The cooling apparatus may greatly increase the heat exchange area by means of providing a circumferential helical water groove. In addition, the turbulent flow structure arranged in the water groove may destroy a heat transfer boundary layer, and effectively strengthen a turbulent flow in a channel, so that the cooling water temperature is also distributed evenly, and a convective heat transfer coefficient is greatly improved.

Classes IPC  ?

• F16H 57/04 - Caractéristiques relatives à la lubrification ou au refroidissement

Abrégé

An electrolytic machining method using dynamic deformation of a flexible electrode. Tubular or rod-like metal is used as a tool electrode (2) for electrolytic machining; the tool electrode (2) has a certain rigidity, but can be bent and deformed when a corresponding load is applied; when a complex profile is machined, a side wall of the tool electrode (2) serves as a machining surface to perform scanning-type electrolytic machining along a surface of the complex profile of a workpiece (3); and during a machining process, different loads are applied according to the curvature change characteristics of the profile of the workpiece, such that the tool electrode is dynamically deformed while being fed, and a deformed shape is similar to a mathematical model of a profile line of the workpiece, such that the machined profile of the workpiece approximates an ideal profile. By means of the electrolytic machining method using dynamic deformation of a flexible electrode, a complex profile can be machined by means of a simple-shaped electrode, thereby improving the electrolytic machining efficiency, and ensuring the machining precision. Further provided is an application of the electrolytic machining method using dynamic deformation of a flexible electrode.

Classes IPC  ?

• B23H 3/04 - Electrodes spécialement adaptées à cet effet ou leur fabrication
• B23H 9/10 - Usinage d'aubes de turbine ou de buses
• C25F 7/00 - PROCÉDÉS POUR LE TRAITEMENT D'OBJETS PAR ENLÈVEMENT ÉLECTROLYTIQUE DE MATIÈRE; APPAREILLAGES À CET EFFET Éléments de construction des cellules, ou leur assemblage, pour l'enlèvement électrolytique de matières d'objets; Entretien ou conduite

Abrégé

The present invention discloses an interlayer pre-cooling apparatus for a sand mold freezing printing,including a sand paving apparatus,where the sand paving apparatus is located above a negative-pressure low-temperature forming chamber, and the sand paving apparatus includes several independent sand paving grooves,a hollow sand paving roller, a cooling chamber, a sand scraping plate, and an openable and closable baffle; the openable and closable baffle is rotationally arranged at a discharge port of each sand paving apparatus, and the openable and closable baffle is used for paving low temperature premixed sand on demand.By providing cooling capacity for the hollow sand paving roller and the sand scraping plate, the premixed molding sand is further cooled during the process of scraping and compacting low-temperature molding sand. When the apparatus is adopted for sand mold freezing 3D printing,the low temperature of the premixed molding sand is precisely controllable, which has great significance for realizing interlayer pre-cooling of the sand mold freezing printing.

Classes IPC  ?

• B22C 1/18 - Compositions des matériaux réfractaires pour moules ou noyaux; Leur structure granulaire; Caractéristiques chimiques ou physiques de la mise en forme ou de la fabrication des moules caractérisées par l'emploi des agents liants; Mélange d'agents liants d'agents inorganiques
• B33Y 30/00 - Appareils pour la fabrication additive; Leurs parties constitutives ou accessoires à cet effet
• B33Y 40/00 - Opérations ou équipements auxiliaires, p.ex. pour la manipulation de matériau
• B33Y 70/00 - Matériaux spécialement adaptés à la fabrication additive
• B22C 9/02 - Moules en sable ou moules analogues pour pièces coulées

Abrégé

Disclosed is an interlayer pre-cooling apparatus for sand mold freezing printing, comprising a sand-laying apparatus, wherein the sand-laying apparatus is located above a negative pressure low-temperature forming chamber, and the sand-laying apparatus comprises several independent sand-laying grooves, hollow sand-laying rollers, cooling chambers, sand-scraping plates and openable and closable baffles. An openable and closable baffle is rotatably arranged at each sand-laying groove discharge port for use in laying low-temperature premixed sand on demand. The hollow sand-laying rollers and the sand-scraping plates provide cooling to further cool premixed molding sand during the levelling and compaction of low-temperature molding sand. By using the present apparatus for 3D sand mold freezing printing, the low temperature of the premixed molding sand is precisely controllable, which is of great significance for achieving the interlayer pre-cooling of sand mold freezing printing.

Classes IPC  ?

• B22C 9/02 - Moules en sable ou moules analogues pour pièces coulées
• B22C 1/18 - Compositions des matériaux réfractaires pour moules ou noyaux; Leur structure granulaire; Caractéristiques chimiques ou physiques de la mise en forme ou de la fabrication des moules caractérisées par l'emploi des agents liants; Mélange d'agents liants d'agents inorganiques
• B33Y 30/00 - Appareils pour la fabrication additive; Leurs parties constitutives ou accessoires à cet effet
• B33Y 40/00 - Opérations ou équipements auxiliaires, p.ex. pour la manipulation de matériau
• B33Y 70/00 - Matériaux spécialement adaptés à la fabrication additive

Abrégé

A low temperature air flow servo auxiliary sand removal apparatus for frozen sand mold cutting, which comprises a hollow cutting tool (3), a main shaft (5) mounted on the hollow cutting tool (3), an air tube (9), and a refrigeration apparatus (11) connected to one end of the air tube (9); the refrigeration apparatus (11) is connected and fixed to an air pump (13) by means of a valve (12); an inner cavity of the hollow cutting tool (3) is provided with a cutting tool through hole (2) along an axis; an inner cavity of the main shaft (5) is provided with a main shaft through hole (6) along an axis; a bearing seat hole used for the placement of a bearing (7) is formed at an upper end of the main shaft (5), an outer race of the bearing (7) matches with the bearing seat hole, and an air tube connector (8) is installed at an inner race; the air tube connector (8) is connected and fixed to the air tube (9); and a surface of the hollow cutting tool (3) is provided with an air spray hole (1) in communication with the cutting tool through hole (2). Further provided is a low temperature air flow servo auxiliary sand removal method for frozen sand mold cutting. The present apparatus is used for waste sand cleanup during frozen sand mold cutting and forming, it can be ensured that a machined surface of a frozen sand mold is free of residual waste sand buildup and adhesion, an influence of sand shavings on the cutting tool and the sand mold is reduced, the surface precision of the sand mold is improved, and the service life of the cutting tool is prolonged.

Classes IPC  ?

• B22C 9/02 - Moules en sable ou moules analogues pour pièces coulées
• B22C 9/12 - Traitement des moules ou noyaux, p.ex. séchage, étuvage
• B23B 27/10 - Outils de coupe avec une disposition particulière pour le refroidissement
• B23Q 11/10 - Dispositions pour le refroidissement ou la lubrification des outils ou des pièces travaillées

Abrégé

An unmanned aerial vehicle (UAV) task cooperation method based on an overlapping coalition formation (OCF) game includes: constructing a sequential OCF game model for a UAV multi-task cooperation problem; using a bilateral mutual benefit transfer (BMBT) order that is biased toward the utility of a whole coalition to evaluate a preference of a UAV for a coalitional structure; optimizing task resource allocation of the UAV under an overlapping coalitional structure by using a preference gravity-guided Tabu Search algorithm to form a stable coalitional structure; and optimizing a transmission strategy based on the current coalitional structure, an updated status of a task resource allocation scheme of the UAV, and a current fading environment, so as to maximize task execution utility of a UAV network. The method quantifies characteristics of resource properties of the UAV and a task, and optimizes the task resource allocation of the UAV under the overlapping coalitional structure.

Classes IPC  ?

• B64C 39/02 - Aéronefs non prévus ailleurs caractérisés par un emploi spécial
• G05D 1/10 - Commande de la position ou du cap dans les trois dimensions simultanément
• H04B 7/185 - Stations spatiales ou aériennes

Abrégé

The disclosure relates to a flexible automatic clamping device and method for backside laser penetration welding of a T-shaped structure. The flexible automatic clamping device includes a clamping system, a ranging system and a control system. The ranging system outputs a position instruction to the control system, the control system outputs a movement instruction to the clamping system, so as to adjust the clamping system to an optimal position, then a stringer pressing plate fastens a stringer by means of a Y-shaped connecting rod, and a skin pressing plate fastens skin by means of a skin connecting rod. Based on the flexible automatic clamping device, the method includes prewelding clamping, backside laser penetration welding and postwelding shape retention. The disclosure implements accurate positioning, automatic clamping, backside laser penetration welding and postwelding shape retention of a T-shaped skin-stringer structure.

Classes IPC  ?

• B23K 37/04 - Dispositifs ou procédés auxiliaires non spécialement adaptés à un procédé couvert par un seul des autres groupes principaux de la présente sous-classe pour maintenir ou mettre en position les pièces
• B23K 26/21 - Assemblage par soudage

Abrégé

An analysis method for dynamic characteristics of a multi-stage planetary gear structure. The analysis method comprises the following steps: respectively establishing nonlinear dynamics models of single-stage spur gear transmission systems according to a lumped-mass method; analyzing a relative displacement relationship and a motion transmission relationship between two adjacent components, and establishing a dynamics equation of a three-stage planetary gear transmission system on the basis of a Lagrange equation; establishing a nonlinear dynamics equation of the three-stage planetary gear transmission system on the basis of time-varying meshing stiffness, a dynamic transmission error and a meshing phase; and analyzing the dynamic characteristics of the three-stage planetary gear transmission system on the basis of a Runger-Kutta method. In the analysis method, nonlinear influence factors, such as time-varying meshing stiffness and a dynamic transmission error, are comprehensively taken into consideration, and a lumped-mass method, a Lagrange equation and a Runger-Kutta method are combined and applied to solving the dynamic characteristics of a three-stage planetary gear transmission system, thereby improving the solving accuracy and efficiency of a multi-stage planetary gear transmission system, and providing great significance to the improvement of the meshing stability and bearing capacity of the gear transmission system and reduction of friction loss.

Classes IPC  ?

• G06F 30/17 - Conception mécanique paramétrique ou variationnelle
• G06F 30/20 - Optimisation, vérification ou simulation de l’objet conçu
• G06F 17/12 - Opérations mathématiques complexes pour la résolution d'équations d'équations simultanées
• G06F 119/14 - Analyse des forces ou optimisation des forces, p.ex. forces statiques ou dynamiques

Abrégé

Disclosed in the present invention is a consequent-pole-type permanent magnet auxiliary synchronous reluctance electric motor operating in a wide area, the electric motor comprising a stator and a consequent-pole-type synchronous reluctance rotor. The stator comprises a stator iron core and an armature winding, wherein the number of pole pairs of the armature winding is equal to the number of pole pairs of the consequent-pole-type synchronous reluctance rotor. The consequent-pole-type synchronous reluctance rotor comprises a rotor iron core, and reluctance poles and permanent magnet poles, which are distributed on the rotor iron core in a circumferential direction, wherein the number of pairs of the reluctance poles is greater than or equal to the number of pairs of the permanent magnet poles; and a direct-axis magnetic circuit of the reluctance pole is closed by means of the iron core, and the reluctance of the direct-axis magnetic circuit of the reluctance pole is smaller than the reluctance of a quadrature-axis magnetic circuit of the reluctance pole, so that a reverse salient pole characteristic can be obtained. The present invention has the reverse salient pole characteristic, and a positive id is used to utilize reluctance torque, so that irreversible demagnetization of a permanent magnet can be avoided. In addition, the direct-axis magnetic circuit of the reluctance pole is closed by means of the iron core, so that a larger direct-axis inductance can be obtained, and the flux-weakening speed expansion capability is stronger. In a full-speed operation range, a current angle adjustment range of the present invention is wide, so that a constant-power speed adjustment range can be enlarged.

Classes IPC  ?

• H02K 1/27 - Noyaux rotoriques à aimants permanents
• H02K 1/24 - Noyaux rotoriques à pôles saillants

Abrégé

A ventilation structure of a core chamber of a turbofan engine having a large bypass ratio, said structure comprising: an outer bypass wall surface (1), a core chamber wall surface (4) and a core casing (7). An outer bypass flow channel (2) is formed between the outer bypass wall surface (1) and the core chamber wall surface (4). A core chamber (6) is formed between the core chamber wall surface (4) and the core casing (7). An air intake annular cavity (3) is provided in the core casing and is located at the upstream position. The air intake annular cavity (3) is used to put the outer bypass flow channel (2) and the core chamber (6) in communication. An exhaust grille (5) is further provided on the core chamber wall surface (4) and is located at a tail position. The exhaust grille (5) is used to discharge cooling gas in the core chamber (6) into the outer bypass flow channel (2). The described structure better achieves the purpose of cooling the surface of the core casing and obtains an improved in-cabin flow heat exchange effect. A ventilation method is also provided.

Classes IPC  ?

• F02C 7/18 - Refroidissement des ensembles fonctionnels caractérisé par l'agent refroidisseur l'agent refroidisseur étant gazeux, p.ex. l'air

Abrégé

The present invention discloses an internal-parallel inlet with mode conversion combined with variable geometry adjustment, which comprises a high-speed channel, a low-speed channel, a mode conversion component, a variable geometry component and a motor actuating component. When the inlet is in a low-speed mode, the variable geometry component adjusts the throat area and the internal contraction ratio of the inlet. When the flight Mach number is in a range of the mode conversion Mach number, the mode conversion component and the variable geometry component work simultaneously. When the inlet is in a high-speed mode, the mode conversion component is combined with the variable geometry component to adjust the throat area and the internal contraction ratio of the inlet. The present invention also provides a method for controlling the inlet.

Classes IPC  ?

• F02C 7/042 - Entrées d'air pour ensembles fonctionnels de turbines à gaz ou de propulsion par réaction à géométrie variable
• F02C 7/057 - Commande ou régulation
• B64D 33/02 - Aménagement sur les aéronefs des éléments ou des auxiliaires des ensembles fonctionnels de propulsion, non prévu ailleurs des entrées d'air de combustion

Abrégé

The present invention provides an energy-efficient channel state information (CSI) transmission method in an NR-vehicle to everything (V2X) network, mainly used for V2X. Considering sidelink (SL) resource allocation of NR-V2X in a mode 1, a 5G base station schedules SL resources used by a V2X user according to CSI regularly reported. In order to reduce overhead, an energy efficiency maximized power allocation solution using a hybrid spectrum access technique is provided to transmit CSI. By means of known CSI, an SL resource allocation problem is modeled, aiming to maximize total throughput of the NR-V2X network according to total available power and a minimum transmission rate. Power allocation is first averaged to quickly obtain appropriate subcarriers, and then an alternative optimization mechanism is provided to perform power allocation. Simulation shows that the provided CSI transmission power allocation solution can significantly reduce energy consumption, and a provided suboptimal SL resource allocation algorithm achieves, with low complexity, better performance than an average power allocation algorithm.

Classes IPC  ?

• H04W 16/10 - Répartition dynamique des ressources
• H04W 52/24 - Commande de puissance d'émission [TPC Transmission power control] le TPC étant effectué selon des paramètres spécifiques utilisant le rapport signal sur parasite [SIR Signal to Interference Ratio] ou d'autres paramètres de trajet sans fil