216results about How to "Achieve lightweight design" patented technology

The utility model provides a battery cell top cover and a battery, and relates to the technical field of lithium batteries. Specifically, the battery cell top cover comprises a cover plate, an upper pole and a lower pole, wherein the cover plate is provided with pole holes for accommodating the upper pole and the lower pole; the upper pole partially protrudes downwards to form a first groove, the lower pole partially protrudes upwards to form a second groove, and the bottom wall of the first groove is connected with the bottom wall of the second groove. Based on the arrangement of the first groove and the second groove, the weights of the upper pole and the lower pole are respectively reduced, and certain materials of the upper pole and the lower pole are saved, so that the lightweight design of the battery cell top cover is realized, and the manufacturing cost of the battery cell top cover is reduced at the same time.

The invention relates to the technical field of robots, in particular to a waist and hip integration mechanism and a humanoid robot. The waist turnover driving piece is arranged on the hip support; the two lateral extension driving pieces are oppositely arranged on the hip support, and the axes of the driving ends of the two lateral extension driving pieces coincide; the two side unfolding supports are connected to the driving ends of the side unfolding driving pieces correspondingly. The two pitching driving parts are respectively arranged on the side extension bracket; the two pitching supports are connected to the driving end of the pitching driving piece. The two hip turnover driving pieces are arranged on the pitching support, and the driving ends of the hip turnover driving pieces are connected with leg mechanisms of the humanoid robot. Nine degrees of freedom at the waist and hip joints of a traditional humanoid robot are optimized into seven degrees of freedom, the number of motors is reduced, the overall weight is reduced, high flexibility and maneuverability are kept, meanwhile, the cruising ability is improved, more space is vacated for the robot, and the lightweight design of the robot is achieved.

The invention discloses a CAD drawing intelligent matching method and system based on multi-stage deep learning, and belongs to the field of image comparison, and the method mainly comprises the steps: S1, loading and preprocessing a CAD drawing, and constructing a triple data set through a data enhancement and sample balance technology; s2, constructing a target detection model and a target matching model, and training the target detection model and the target matching model by using the triple data set; wherein the target detection model adopts a YOLOv5 model, and the CAD drawing is detected in combination with sliding window detection and a non-maximum suppression technology; the target matching model adopts a double-end network structure; and S3, matching the CAD drawings to be identified by using the trained target detection model and target matching model. According to the invention, through a plurality of advanced technologies, intelligent matching and judgment of two or more CAD images in any different formats are realized.

The invention provides a cylinder body of a rotor type compressor pump body and a manufacturing method, and relates to the technical field of compressors, the inner circumferential wall of the cylinder body is provided with an air suction part used for air suction and a sliding sheet seat used for containing a sliding sheet, and the cylinder body is formed by compounding an insert and a light material; a slip sheet seat is formed in the insert, the requirement for wear resistance of the slip sheet in the slip sheet seat is met, an air suction part is formed in the insert, and the requirements for coaxiality and connection strength of the air suction part and the air suction pipeline are met; materials, except the inserts, of the cylinder body are replaced by light materials, so that the light-weight design of the cylinder body can be realized under the condition that the wear resistance and the coaxiality are met; compared with the prior art, a sliding sheet seat and an air suction part in a cylinder body can only be machined one by one, and more than ten or even dozens of inserts such as a sliding sheet seat insert or an integrated insert or an air suction seat insert can be machined at a time, so that large-scale production and machining can be performed, the production efficiency can be improved, and the consistency of product quality can be ensured.

The invention discloses a lightweight epilepsy electroencephalogram signal four-classification method, and relates to the technical field of electroencephalogram signal processing. Integrating short-time Fourier transform, a spectrum reconstruction strategy, a one-dimensional convolutional neural network and a long-short term memory network, and constructing an electroencephalogram signal four-classification model; based on the trained electroencephalogram signal four-classification model, the electroencephalogram signals of the user serve as input, and the probability value that the electroencephalogram signals belong to each category is output; comparing the probability values of the four categories, taking the category with the maximum probability value as the category to which the electroencephalogram signal belongs, and sending a corresponding alarm according to the category to which the electroencephalogram signal belongs. Compared with traditional dichotomous and trichotomous models, the electroencephalogram signal four-classification model of the application brings features in the later period of attack into the range of recognition, the accuracy of the model is improved, and based on the lightweight design of the spectrum reconstruction strategy, the reliability of the model is improved. The lightweight epilepsy electroencephalogram signal four-classification method provided by the invention can be applied to edge wearable equipment scenes.

The invention discloses a SiC MMC sub-module capacitor voltage fluctuation suppression method and system, and belongs to the technical field of electronic power. According to the analysis result of the optimal broadband harmonic circulation injection boundary and number of times of the SiC MMC sub-module, a sub-module capacitor voltage fluctuation optimization model for simultaneously injecting second, fourth and eighth harmonic circulation and third harmonic voltage is determined, and the characteristic of higher control bandwidth of the SiC MMC can be fully utilized; by solving a submodule capacitor voltage fluctuation optimization model, the amplitudes and phases of reference values of second, fourth and eighth harmonic circulation needing to be injected and the amplitude and phase of corresponding third harmonic voltage are determined, then the second, fourth and eighth harmonic circulation is injected, and the third harmonic voltage injection is combined to realize broadband harmonic combined injection. The capacitance voltage fluctuation of the sub-module is reduced, the capacitance voltage fluctuation suppression method for the SiC MMC sub-module is realized, and the suppression effect is relatively high.

The invention discloses a heat management integration module and a vehicle, the heat management integration module comprises a first heat exchanger and a confluence plate, the first heat exchanger is provided with a first flow path and a second flow path which can exchange heat with each other, the confluence plate is internally provided with a plurality of built-in flow channels, and the first heat exchanger is arranged on the confluence plate; the first flow path and the second flow path are installed on the confluence plate, the first flow path and the second flow path communicate with different built-in flow channels correspondingly, the switching valve assembly is installed on the confluence plate, and the switching valve assembly is used for selectively communicating the different built-in flow channels. The weight of the heat management integrated module can be reduced, lightweight design can be achieved, meanwhile, different built-in flow channels can be selectively communicated through the switching valve assembly so that multiple working modes of the heat management system can be achieved, and a temperature sensor is arranged in at least one built-in flow channel so that the heat management system can work in multiple working modes; the temperature of the cooling medium in the heat management integrated module can be better determined.

The invention belongs to the technical field of remote sensing, and particularly relates to a nuclear power plant surrounding ground feature element extraction method based on deep learning, and the method comprises the steps: 1, making a nuclear power plant surrounding ground feature deep learning sample; step 2, based on the HRNet model, constructing a Mama attention residual module, an inner convolution residual module and an asynchronous convolution residual module through Mama, inner convolution and heterogeneous convolution, and constructing an improved HRNet model; 3, training of a U-Net model, a Deeplabv3 model, a HRNet model, a Swin Transformer model and an improved HRNet model is completed through the sample set training data and the verification data; 4, evaluating land element extraction results of different deep learning models; and 5, extracting elements of the surrounding land of the large-scale nuclear power plant by using the trained improved HRNet model. The method can effectively improve the extraction precision of complex ground feature elements around the nuclear power plant, remarkably improves the calculation efficiency of the model, and is suitable for efficient monitoring and classification of multiple ground feature elements around the nuclear power plant in a large range.

The invention relates to the technical field of computer vision, lane line detection and automatic driving, provides a night lane line detection method and device based on decomposition convolution, and aims to improve the accuracy and stability of lane line detection under a night light condition. The method comprises the following steps: firstly, acquiring image data of various vehicles on a night traffic road, marking the data, and establishing a reference data set CULane-Night for night lane line detection; based on the data set, the invention provides a lane line detection model MDCR-Net, and the model comprises a specially designed encoder module (MDCRM) and an attention module (SPA). The MDCRM adopts a multi-scale decomposable convolution residual module, can effectively extract features of lane lines in a complex scene at night, and realizes lightweight design by reducing model parameters and calculation amount. The SPA module comprehensively considers lane information in the horizontal direction and the vertical direction through a strip-shaped pooling technology, so that the recognition capability of the model on the sheltered area is improved.

The invention relates to the field of jumping robots, in particular to a hydraulically-driven two-degree-of-freedom coupling type humanoid-leg jumping robot and a control method thereof. The overall structure of the robot simulating jumping of the human legs is composed of a driving assembly, a thigh assembly and a shank assembly. The designed jumping robot is simplified into an SLIP model, a PID controller is adopted in the jumping process to achieve control over the flying phase of the jumping robot, and a PD controller is adopted in the landing phase for control. The hydraulic cylinders are far away from the legs, so that the hydraulic cylinders are driven to move to the upper body, and the whole robot has better attractiveness. And meanwhile, the lightweight design of the legs is achieved, the inertia of the legs is reduced, and the robot has more stable dynamic performance. And the vertically placed hydraulic cylinder is designed, so that the driving efficiency is further improved, and finally, more efficient bionic jumping movement is realized.

According to the upper limb forearm and wrist rehabilitation mechanism based on the double-layer four-rod tensioning structure, the overall tensioning structure is combined with the mechanism design, and the rigid-flexible mixed characteristic of the overall tensioning structure composed of the four-rod flexible stretching unit and the four-rod rigid compression unit is utilized; the problems that a traditional rehabilitation mechanism is too complex, a driving device is huge, and equipment light weight is insufficient are solved. A wrist support seat in the wrist rehabilitation mechanism is connected with an upper fixing ring in the forearm tensioning integral mechanism through a bolt. Compared with the prior art, the invention has the following technical effects: the rigid-flexible mixed characteristic of the tensegrity structure is utilized to meet the requirements of motion of each degree of freedom, meanwhile, the structure of the exoskeleton is simplified, the lightweight design is realized, and the torsion angle can be increased and the flexibility can be improved through the mutual compensation of the internal length in the motion process. And the overall height of the mechanism can be kept unchanged.

The present invention relates to the technical field of manipulators, and specifically discloses a fast-response rope-driven adaptive two-finger gripper, comprising a transmission mechanism, a drive mechanism, a linear guide mechanism, a first clamping finger, a second clamping finger, a rope guide assembly, a differential rope winding wheel and four fixed-axis rope winding wheels; the differential rope winding wheel has a first rope, a second rope, a third rope and a fourth rope; the four fixed-axis rope winding wheels are configured to correspond to the first rope, the second rope, the third rope and the fourth rope one by one; the swing of the transmission mechanism can drive the linear motion of the first clamping finger and the second clamping finger; the rotational direct-drive differential motion is realized by two groups of antagonistic rope pairs, when the tension formed by the four ropes is balanced with each other, the two groups of ropes move in the same way, however, when the tension of the two groups of antagonistic rope pairs is unbalanced, the rope tension difference directly drives the differential wheel to rotate, thereby avoiding the problems of gear transmission friction and large rotational inertia in traditional technologies, and reducing the response delay caused by static friction.

The invention belongs to the technical field of rocket launching, and particularly relates to a rocket fairing noise reduction method and device and a storage medium. The method comprises the following steps: acquiring a noise signal; performing spectral analysis on the acquired noise signal by adopting fast Fourier transform to obtain a frequency domain signal, the frequency domain signal comprising amplitude and phase information under different frequency components; setting a boundary of each frequency band, extracting feature information of each frequency band, and extracting noise components of each frequency band according to the feature information of each frequency band; the noise reduction strategy of each frequency band is optimized through an artificial bee colony algorithm, and the optimal frequency and amplitude of the anti-phase sound waves of each frequency band are obtained; and according to the output of the artificial bee colony algorithm, anti-phase sound waves are generated, and active noise reduction is carried out on the fairing. According to the method, the overall noise reduction performance of the fairing can be improved, the response speed is high, the requirement for computing resources is low, and the method is suitable for scenes with strict requirements for time and resources in rocket launching scenes.

The invention relates to a thermoplastic composite material capable of absorbing X-rays and a preparation method thereof, and belongs to the technical field of high polymer materials, X-ray shielding materials such as nano Gd2O3 and Bi2O3 are modified by using a silane coupling agent, and the compatibility and dispersity of the X-ray shielding materials with thermoplastic matrixes such as high molecular weight polyethylene are enhanced through a chemical bonding effect. Meanwhile, modified graphene and sodium humate components are introduced, and a two-dimensional structure of graphene and a functional group of sodium humate interact with the nano shielding material and a matrix, so that the dispersity and the interface bonding force of the material are further improved. The preparation method has the advantages that effective dispersion and stabilization of the refined nanometer shielding material are realized, the composite material is guaranteed to keep a high shielding effect, meanwhile, the composite material has excellent mechanical properties and lightweight design, and a new thought and approach are provided for developing an efficient, lightweight and stable X-ray shielding material.

The present invention discloses a grid-reinforced rib column shell, comprising a column shell body and grid-reinforced ribs, wherein the column shell body has an inner circumferential surface; the grid-reinforced ribs are arranged on the entire inner circumferential surface, and the rib cross-section of the grid-reinforced ribs gradually increases from both ends to the middle in the axial direction of the column shell body. The grid-reinforced rib column shell of the present invention has high bearing capacity, simple processing technology, can realize lightweight design of the column shell, and is suitable for large-scale mass production.

The invention relates to a conductive and electromagnetically shielding polyaryletherketone-based composite material and a preparation method thereof, comprising the following steps: S1, forming a mixed dispersion of a carbon-based MFI structure molecular sieve and a metal salt, and performing a heating reaction to obtain a loaded carbon-based MFI structure molecular sieve; S2, uniformly mixing the loaded carbon-based MFI structure molecular sieve and polyaryletherketone, and then performing melt blending, extrusion, and granulation to obtain a first material; S3, uniformly mixing a conductive filler and polyaryletherketone, and then performing melt blending, extrusion, and granulation to obtain a second material; S4, mixing the first material and the second material according to a proportion, and then performing melt blending, extrusion molding or granulation to obtain a conductive and electromagnetically shielding polyaryletherketone-based composite material; the composite material of the invention has significant electromagnetic shielding effectiveness and excellent comprehensive mechanical properties.

The invention discloses a battery pack shell and a battery pack, the battery shell comprises a shell and a heat insulation and pressure relief structure, and the shell is provided with a first accommodating cavity and a second accommodating cavity; the heat insulation and pressure relief structure comprises a first heat insulation and pressure relief piece and a second heat insulation and pressure relief piece, the first heat insulation and pressure relief piece and the second heat insulation and pressure relief piece are arranged between the first containing cavity and the second containing cavity respectively, and the first heat insulation and pressure relief piece and the second heat insulation and pressure relief piece are oppositely arranged in a spaced mode to form a pressure relief channel. An exhaust hole is formed in the side wall of the shell so that the pressure relief channel can communicate with the exterior of the shell through the exhaust hole. Therefore, the problem of explosion caused by thermal runaway can be prevented, the single battery cells of the adjacent accommodating cavities can be protected, and an existing scheme of carrying out mechanical thermal runaway protection through a high-strength battery shell can be replaced, so that the weight of the battery shell is reduced, the lightweight design of the battery pack is realized, and the service life of the battery pack is prolonged. And the grouping rate and the energy density of the battery pack are improved.

The present invention provides a satellite-borne dual-band common-surface antenna array based on a metal structure. The antenna array is a metal structure and is divided into two parts. One part is a hollow frame structure, which adopts a Vivaldi structure antenna form. Through the design of structural folding, structural hollowing, coupling between units, etc., the antenna has good electrical performance in the P band; the other part is embedded between the P-band antenna units and is located at the bottom of the overall structure. It serves as a metal floor of the P band and can also realize the slot radiation waveguide of the X-band electrical performance. The present invention also designs the dual-band antenna arrays into a dual-polarization form, in order to avoid polarization rotation caused by multipath reflection when electromagnetic waves penetrate dense plants, thereby generating polarization mismatch.

The invention discloses a lightweight emission spectrum spectrometer device which comprises a supporting base, a vacuum cavity, a sample table mechanism, a spherical curved crystal monochromatic mechanism and a detector mechanism. According to the spherical curved crystal monochromatic mechanism, the design scheme of center load is adopted, the two lead screws are driven to operate through the single motor, transmission is achieved through the anti-backlash gear, and therefore the spherical curved crystal monochromatic mechanism is driven to move vertically, and torque load is greatly reduced. By applying the scheme provided by the embodiment of the invention, the lightweight design of the emission spectrum spectrometer device can be effectively realized, and the cost of the emission spectrum spectrometer device is effectively reduced while the space use efficiency is greatly improved.

The present application relates to a kind of integrated force arm structure, double rear axle suspension system and its vehicle, it includes: first force arm, the first force arm has first body, and from the first body towards one side extends to form two first arms spaced apart, each the first arm is rotatably connected with pin shaft, two the pin shaft on the first arm coaxially arranged and interval distribution;Second force arm, the second force arm has second body, and from the second body towards the side close to the first force arm extends to form two second arms spaced apart, two the second arm is arranged with two the first arm one by one, and each the second arm is rotatably connected to the pin shaft corresponding with the first arm;The first body extends to form first axle connecting arm towards away from the second body direction, the second body extends to form second axle connecting arm towards away from the first body direction.Two force arms integrated connection, simple structure, realize lightweight design.

The invention relates to the field of aviation refrigeration cycle structure design, in particular to a zero-inner-leakage electric four-way reversing valve suitable for a refrigerating medium. Comprising a shell, a connector, a vulcanization valve, a ball valve assembly, a driving shaft, a fastener, a gasket, an electric mechanism, a connecting plate, a baffle, a third sealing ring, a fourth sealing ring, a waveform gasket, a first sealing ring, a second sealing ring and a bearing. The structure is used in an aviation refrigeration cycle structure system to replace an original four-electromagnetic direct-acting valve structure, the problems that a refrigerant reversing valve leaks inwards and cannot feed back signals are solved, and the design integration degree of a refrigeration cycle system is improved. The design of a refrigerant reversing pipeline of a refrigeration cycle system is simplified, and the lightweight design of the whole system is achieved.

This invention relates to an integrated variable camber wing based on a piezoelectric-driven torsional cubic superstructure, comprising a wing skeleton and a skin. The wing skeleton includes multiple torsional cubic superstructures arrayed along the wing chord direction. Each torsional cubic superstructure is a cube formed by an array of multiple unit-cell torsional superstructures. Adjacent unit-cell torsional superstructures in the wing length and thickness directions share a straight rod, while adjacent unit-cell torsional superstructures in the wing width direction share four Z-shaped piezoelectric rods. Each unit-cell torsional superstructure is a cube formed by an array of four cell units, with adjacent cell units sharing a straight rod. Each cell unit includes Z-shaped piezoelectric rods and straight rods. Two Z-shaped piezoelectric rods are connected to the two ends of two straight rods. Each Z-shaped piezoelectric rod at both ends of the torsional cubic superstructure is connected to the skin. When all the Z-shaped piezoelectric rods of the unit-cell torsional superstructure undergo compressive deformation in the height direction, the unit-cell torsional superstructure undergoes torsional deformation, thus causing the torsional cubic superstructure to undergo torsional deformation. By converting the compressive deformation of the cellular unit into the torsional deformation of the compressive-torsional cubic superstructure, the wing camber is changed, and the drive components are eliminated, thus realizing the lightweight design of the morphing wing.

The utility model discloses a radiator, which relates to the radiator field, and comprises a support main body and a heat radiation assembly, the support main body comprises at least one support column, the support column extends along a first direction, and the first end of the support column is used for being connected with an external heat source; the heat dissipation assembly comprises a plurality of heat dissipation fins, the multiple heat dissipation fins are arranged outside the supporting body in a sleeving mode and distributed at intervals in the first direction, and at least one heat dissipation hole penetrates through each heat dissipation fin; wherein the support main body and the radiating fins are diamond aluminum alloy composite parts respectively; thus, the supporting body and the cooling fins have high thermal conductivity, the thermal conductivity can reach 400 W / (m.K) or above, the high-temperature resistance is improved to 600 DEG C, and the phenomenon of oxidation and falling is avoided, so that the reliability and durability of the radiator under complex working conditions are improved, and the lightweight design of the radiator is facilitated; at least one radiating hole penetrates through the radiating fin, so that the radiating area is increased, and the weight is further reduced; meanwhile, the multiple cooling fins are arranged at intervals, the heat exchange efficiency can be improved, and then the cooling efficiency is improved.

A shoe-washing cylinder with high efficiency and cleanliness comprises a cylinder body, a pulsator is arranged at the bottom of the cylinder body, the pulsator is connected to a driving mechanism, a rotating seat is arranged on a movable sleeve of the pulsator, a plurality of shoe molds for fixing shoes are arranged on the rotating seat and are evenly distributed around the circumference, and the shoe molds are arranged horizontally, and a shoe-washing plate is arranged in the cylinder body, and the shoe-washing plate is arranged directly above the shoe molds, and a first bristle is arranged on the lower end surface of the shoe-washing plate. The shoe-washing machine fixes the shoe on the shoe mold by the arrangement of the shoe mold, so as to prevent the shoe from colliding with the pulsator, the cylinder wall and other parts during the cleaning process and damaging the parts or the shoe itself. And through the coordinated cleaning of the first to fifth bristles, the cleaning quality of the shoe can be guaranteed, and the all-round cleaning of the shoe can be guaranteed. At the same time, the horizontal design of the shoe mold is matched with the shoe-washing plate to ensure that the shoe is also in the horizontal direction, so that the shoe can be cleaned without a shoe-washing rod, which reduces the volume of the cylinder body and realizes the lightweight design of the shoe-washing machine.

The present invention discloses a half-wave alternating AC-AC converter topology and a control method thereof, which relates to the technical field of power supply system, and includes three phase unit circuits with the same structure, each phase unit circuit includes a symmetrical input side converter and an output side converter, and is respectively connected to AC systems of different frequencies; wherein a half-wave shaping switch group includes a positive terminal, a negative terminal and an AC output terminal, one end of a variable frequency half-wave generation module is connected to the positive terminal, connected to the positive terminal of the other side through a filter inductor, and the other end is connected to the negative terminal of the other side through a negative terminal, and both ends are connected to the AC system through an AC output terminal; the variable frequency half-wave generation module outputs a step sine half wave, and the half-wave shaping switch group performs translation and flipping operations on the step sine half wave to obtain a shaped half wave, and obtains an AC side phase voltage sine wave based on the shaped half wave within a cycle. Frequency isolation of the AC systems on both sides is achieved, and the output of a complete AC side phase voltage sine wave is achieved.

The invention discloses a left ventricle segmentation method based on an optimized UNet network and an improved CBAM attention mechanism, and belongs to the technical field of image processing. The method specifically comprises the following steps: constructing a lightweight attention mechanism SCBAM, combining the lightweight attention mechanism SCBAM with a convolutional VGG network, cutting a UNet network to L3, and carrying out lightweight design to reduce calculation and storage overhead. By combining an SCBAM attention mechanism, a VGG network and jump connection, an iterative up-down sampling block Nestedunet is constructed, the accuracy of cardiac function evaluation is improved, and a lighter and more efficient solution is provided for automatic auxiliary diagnosis in practical application.

The utility model discloses a split type battery pack upper shell, the upper shell comprises a first cover plate and a second cover plate, the first cover plate and the second cover plate are detachably connected, one side of the second cover plate is provided with a lap joint edge, the lap joint edge is arranged above one side of the first cover plate, a sealing structure is arranged between the lap joint edge and the first cover plate, and the lap joint edge and the first cover plate are detachably connected. The split type battery pack upper shell is simple in structure and convenient to install, the number of fasteners is reduced, and the manufacturing cost is reduced.

The embodiment of the invention provides a joint module and a robot. The joint module comprises a shell, a driving mechanism and an output flange. The shell is of a cylindrical structure, the driving mechanism is arranged in the shell, and an output shaft of the driving mechanism penetrates through the end face of the shell; the output flange is arranged outside the shell, and the output flange is connected with an output shaft of the driving mechanism; the output flange is used for being connected with the first robot assembly, and the driving mechanism is used for driving the output flange to rotate so that the output flange can drive the first robot assembly to rotate. At least one first connecting structure is arranged on the outer side wall of the shell and used for being connected with a second robot assembly, and the included angle between the extending direction of the second robot assembly and the axis of the shell is larger than zero degree. At least one end of the shell is provided with a second connecting structure, the second connecting structure is used for being connected with a third robot assembly, and the extending direction of the third robot assembly is parallel to the axis of the shell. The joint module provided by the invention can be compatible with multi-direction installation.

The vehicle body structure disclosed in this application includes a roof, side walls, a chassis, and end walls. The top of the side walls is connected to the roof, and the bottom of the side walls is connected to the chassis. The end walls are located at both ends of the chassis extension direction and are connected to the roof and chassis, respectively. The roof, side walls, chassis, and end walls are all sandwich structures. Compared to existing vehicle body structures using plate-beam connections, the sandwich structure of this application significantly reduces the number of parts, thus reducing the weight of the vehicle body and achieving a lightweight design. It also reduces manual labor and improves the efficiency of automated production.

The invention discloses a multi-material topological optimization method for aircraft structure design, and belongs to the technical field of aerospace. The method comprises the following steps: establishing an expanded design area; carrying out grid division; establishing a material interpolation model; finite element analysis is carried out, and the sensitivity of objective function quality constraint conditions is obtained; sequentially updating the design field variable, the filtering field variable and the physical field variable, and applying implicit floating projection constraint; judging whether a convergence condition is met; performing smooth design; re-dividing the structure subjected to smooth design by using an original grid, and performing sensitivity analysis; and calculating an error value, judging whether an accurate smooth design condition is met or not, and if so, ending optimization and outputting an optimal structure. According to the method, under the condition that good convergence performance is guaranteed, material selection can be carried out in the topological optimization process, meanwhile, the iteration step number needed by topology is reduced through the three-field technology, optimization efficiency is improved, and the final structure has a clear and smooth boundary and can be directly used for manufacturing.