Optimization design method, system and equipment for truck air bag support and medium

Abstract

The invention provides an optimization design method, system, equipment and medium for a truck air bag support, and belongs to the technical field of optimization design of vehicle supports. The method comprises the steps that a design space of the air bag support is built, and a three-dimensional geometric model of the air bag support is built; cleaning the three-dimensional geometric model of the airbag stent, pre-processing grid division and establishing a connection relation, and performing contact load transmission between contact surfaces by using an ROD unit; defining material attributes, loads and boundary conditions of the three-dimensional geometric model of the airbag stent, setting analysis working conditions, defining topological optimization and response parameters, and setting constraint conditions and optimization targets; calculating the flexibility of each analysis working condition, carrying out normalization processing, then calculating a flexibility weighting coefficient, and constructing a weighted flexibility expression; and executing topological optimization, and evaluating an optimization result until the design requirements and constraint conditions are met. According to the method, the problem of contact nonlinearity can be accurately processed, and the limitation of a traditional topological optimization method is broken through.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle bracket optimization design, and in particular relates to an optimization design method, system, equipment and medium for a truck airbag bracket. Background Art

[0002] In the field of vehicle engineering, the airbag bracket is a key component connecting the frame and the axle, and its design is directly related to the safety and stability of the vehicle. During the operation of the vehicle, the airbag bracket needs to withstand the load from the road excitation and the load transmitted through the air suspension, so its working state load and load are diverse. In order to obtain the optimal mechanical structure of the airbag bracket, the use of topology optimization method has become a generally recognized and efficient means in the industry.

[0003] Although the traditional topology optimization method is widely used in vehicle component design, it still has limitations when dealing with the nonlinear mechanical behavior unique to airbag brackets, especially in terms of contact nonlinearity. If the contact load is ignored, the stress environment of the optimized structure will be significantly different from the actual situation, making it difficult for the designed bracket structure to meet high standards such as safety, stability and lightweight. Therefore, designers are often required to perform multiple rounds of modifications and calculations in the later stage, which is not only time-consuming, but also difficult to obtain the optimal structure, which is not conducive to achieving energy-saving and lightweight design goals.

[0004] Although some topology optimization technologies for vehicle components have emerged, most of these methods do not consider the impact of contact loads, and do not provide effective solutions, which seriously restricts the development of vehicle engineering. Therefore, how to break through the limitations of traditional topology optimization methods and accurately handle contact nonlinear problems has become a key issue that needs to be solved in the industry. Summary of the invention

[0005] In a first aspect, an embodiment of the present application provides an optimization design method for a truck airbag bracket, comprising the following steps: S1. Build a design space for the airbag stent and construct a three-dimensional geometric model of the airbag stent based on the design space; S2. Clean up the three-dimensional geometric model of the airbag stent in the finite element software, perform pre-processing of meshing, and establish connection relationships, and use ROD units instead of contact definitions between contact surfaces to transfer contact loads; S3. Define the material properties, loads and boundary conditions of the three-dimensional geometric model of the airbag bracket, set the analysis conditions, define the topology optimization parameters and response parameters for each analysis condition, and set the constraints and optimization goals; S4. Calculate the flexibility of the airbag support structure in each analysis condition, calculate the flexibility weighting coefficient after normalizing the flexibility of each analysis condition, and then construct a weighted flexibility expression of the airbag support structure; S5. Perform topology optimization according to the optimization objective and the weighted flexibility expression, and evaluate the optimization results until the design requirements and constraints are met.

[0006] Furthermore, the specific steps of step S1 are as follows: S11. Determine the design space in the finite element software HyperMesh according to the overall layout of the vehicle and the functional requirements of the airbag bracket; S12. Establishing a three-dimensional geometric model of the airbag stent according to the design space in the finite element software, wherein the three-dimensional geometric model omits the definition of process and processing feature details; S13. Assemble the three-dimensional geometric model of the airbag bracket, the vehicle frame model, and the airbag model according to assembly requirements.

[0007] Furthermore, the specific steps of step S2 are as follows: S21. Import or open the assembled three-dimensional geometric model of the airbag bracket in the finite element software HyperMesh, and clean up the overlapping, missing or erroneous geometric elements in the three-dimensional geometric model of the airbag bracket; S22. Pre-processing the meshing of the three-dimensional geometric model of the balloon stent in the finite element software HyperMesh and establishing the connection relationship; S23. Determine the contact surface in the finite element software HyperMesh, and use ROD elements between the two contact surfaces instead of contact definition to transfer the contact load.

[0008] Furthermore, the specific steps of step S22 are as follows: S221. Using SHELL units to mesh the sheet metal parts in the three-dimensional geometric model of the airbag bracket in the finite element software HyperMesh; S222. Using the finite element software HyperMesh to mesh the optimized design space using tetrahedral TETRA4 units in the three-dimensional geometric model of the balloon stent; S223. Use BEAM units to simulate the connection relationship of the three-dimensional geometric model of the airbag bracket in the finite element software HyperMesh.

[0009] Furthermore, the specific steps of step S3 are as follows: S31. Define the material properties of each mesh corresponding to the components in the three-dimensional geometric model of the airbag stent in the finite element software HyperMesh according to the actual material of the airbag stent; S32. Define the load borne by the airbag bracket in the finite element software HyperMesh according to the actual load conditions during vehicle operation, and define the boundary conditions; S33. Setting analysis conditions in the finite element software HyperMesh, the analysis conditions including static strength analysis conditions, static stiffness analysis conditions, dynamic stiffness analysis conditions and modal analysis conditions; S34. defining topology optimization parameters for each analysis condition, wherein the topology optimization parameters include optimization space, minimum size, symmetry constraint, and draft direction; S35. defining response parameters for each analysis condition, wherein the response parameters include volume fraction, displacement, modal frequency, and weighted flexibility; S36. Setting the minimum weighted flexibility as the optimization target, and setting optimization constraints, wherein the optimization constraints include displacement constraints, volume fraction constraints, and frequency constraints.

[0010] Furthermore, the specific steps of step S4 are as follows: S41. Calculate the flexibility of the structure between the airbags in each analysis condition , and the flexibility of each analysis condition is normalized by the following formula: ; in, is the minimum compliance of each analysis condition; S42. Calculate the flexibility weighting coefficient for each analysis condition using the following formula: : ; S43. Calculate the weighted flexibility of the three-dimensional model of the balloon stent defined in step S35 by the following formula: : ; Where N is the number of analysis cases.

[0011] Furthermore, the specific steps of step S5 are as follows: S51. In the finite element software HyperMesh, according to the optimization goal of minimizing weighted flexibility, a topology optimization process is performed in combination with optimization constraints and weighted flexibility to obtain an optimized airbag support structure; S52. Evaluate the optimized balloon stent structure to check whether it meets all design requirements and constraints; If yes, go to step S54; If not, proceed to step S53; S53. Adjust the optimization parameters, constraints or flexibility weighting coefficients of each analysis condition according to the evaluation results, re-execute the optimization, and return to step S51; S54. Import the optimized airbag support structure into the three-dimensional software for reconstruction, and reassemble it for calculation under various analysis conditions, and make adjustments and improvements based on the calculation results.

[0012] In a second aspect, the present application also provides an optimization design system for a truck airbag bracket, including: A three-dimensional geometric model building module is used to build a design space of the airbag stent and build a three-dimensional geometric model of the airbag stent according to the design space; The 3D geometric model cleaning and pre-processing module is used to clean the 3D geometric model of the airbag bracket in the finite element software, pre-process the mesh division, and establish the connection relationship, and use ROD units instead of contact definitions between contact surfaces to transfer contact loads; The 3D geometric model analysis module is used to define the material properties, loads and boundary conditions of the 3D geometric model of the airbag bracket, set the analysis conditions, define the topology optimization parameters and response parameters for each analysis condition, and set the constraints and optimization goals; A weighted flexibility calculation module is used to calculate the flexibility of the airbag support structure under each analysis condition, and calculate the flexibility weighting coefficient after normalizing the flexibility of each analysis condition, and then construct a weighted flexibility expression of the airbag support structure; The airbag bracket optimization module is used to perform topology optimization according to the optimization objectives and weighted flexibility expressions, and evaluate the optimization results until the design requirements and constraints are met.

[0013] In a third aspect, an embodiment of the present application further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the optimization design method for the truck airbag bracket as described in the first aspect are implemented.

[0014] In a fourth aspect, an embodiment of the present application further provides a storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps of the method for optimizing the design of the truck airbag bracket as described in the first aspect are implemented.

[0015] It can be seen from the above technical solutions that the present invention has the following advantages: In the optimization design method, system, equipment and medium of the truck airbag bracket provided in this application, a weighted flexibility expression is constructed to comprehensively consider the flexibility under various analysis conditions, so that the optimized structure is more in line with the actual stress environment and the accuracy of the design is improved. The optimized airbag bracket structure also achieves a lightweight design and can accurately handle contact nonlinear problems, breaking through the limitations of traditional topology optimization methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0017] Figure 1 The figure is a flow chart of the optimization design method of the truck airbag bracket of the present invention.

[0018] Figure 2 It is a schematic diagram of the optimization design system of the truck airbag bracket of the present invention.

[0019] Figure 3 It is a schematic diagram of a three-dimensional geometric model of the truck airbag bracket of the present invention.

[0020] Figure 4 It is a schematic diagram of a three-dimensional geometric model of the truck airbag bracket of the present invention after using ROD units to replace the contact surface.

[0021] Figure 5 It is a schematic diagram of the optimization process of the truck airbag bracket of the present invention. DETAILED DESCRIPTION

[0022] In the specific steps of the optimization design method of the truck airbag bracket, which will be described in detail below, various embodiments of the present disclosure will be described more fully. The present disclosure may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of the present disclosure to the specific embodiments disclosed herein, but rather the present disclosure should be understood to cover all adjustments, equivalents and / or alternatives that fall within the spirit and scope of the various embodiments of the present disclosure.

[0023] For example, in vehicle engineering, the airbag bracket is the key to connecting the frame and the axle, and is crucial to driving safety and stability. It needs to withstand a variety of loads, including road excitation and loads transmitted by the air suspension. In order to design the best mechanical structure, topology optimization methods are widely used. However, traditional topology optimization has limitations in dealing with the nonlinear mechanical behavior of the airbag bracket, especially contact nonlinearity. Ignoring the contact load will cause the design to be inconsistent with the actual force environment, and it is difficult to meet the requirements of safety, stability and lightweight. This often requires designers to make multiple modifications and calculations later, which is time-consuming and labor-intensive and difficult to obtain the optimal structure. Although there are some topology optimization technologies for vehicle components, most of them do not fully consider the impact of contact loads, lack effective solutions, and restrict the development of vehicle engineering. Therefore, breaking through the limitations of traditional topology optimization and accurately handling contact nonlinear problems have become the key issues that the industry needs to solve urgently.

[0024] In response to the above problems, this embodiment provides an optimization design method for a truck airbag bracket. By constructing a weighted flexibility expression, the flexibility under each analysis condition is comprehensively considered, so that the optimized structure is more in line with the actual stress environment, so that the contact nonlinear problem can be accurately handled, breaking through the limitations of traditional topology optimization methods, and improving the accuracy of the design. In addition, the optimized airbag bracket structure achieves a lightweight design while meeting the safety and stability requirements.

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1 The figure is a flow chart of an optimization design method of a truck airbag bracket in a specific embodiment, and the method comprises the following steps: S1. Build a design space for the airbag stent and construct a three-dimensional geometric model of the airbag stent based on the design space; It should be noted that by building the design space, the design scope and objectives are determined, which provides a basis for subsequent optimization design; by constructing a three-dimensional geometric model, the structure and shape of the airbag stent are intuitively displayed, which is convenient for subsequent analysis and optimization; S2. Clean up the three-dimensional geometric model of the airbag stent in the finite element software, perform pre-processing of meshing, and establish connection relationships, and use ROD units instead of contact definitions between contact surfaces to transfer contact loads; It should be noted that the accuracy and reliability of the model were ensured by cleaning the 3D geometric model, and the contact definition was replaced by ROD elements to solve the contact nonlinearity problem and improve the accuracy of the analysis; S3. Define the material properties, loads and boundary conditions of the three-dimensional geometric model of the airbag bracket, set the analysis conditions, define the topology optimization parameters and response parameters for each analysis condition, and set the constraints and optimization goals; It should be noted that by setting reasonable parameters and conditions, the accuracy of the optimization process is ensured, providing data support for subsequent analysis and optimization; S4. Calculate the flexibility of the airbag support structure in each analysis condition, calculate the flexibility weighting coefficient after normalizing the flexibility of each analysis condition, and then construct a weighted flexibility expression of the airbag support structure; It should be noted that the flexibility is quantified by the flexibility weighting coefficient, and the flexibility influence under various working conditions is comprehensively considered through normalization and weighting processing to improve the optimization effect; S5: Perform topology optimization according to the optimization objective and weighted flexibility expression, and evaluate the optimization results until the design requirements and constraints are met; It should be noted that the optimization and improvement of the airbag bracket structure was achieved through topology optimization, and the reliability of the optimization results was ensured through evaluation and adjustment.

[0027] This embodiment effectively solves the limitations of traditional topology optimization methods in dealing with the nonlinear contact problem of airbag brackets by building a model, performing preprocessing, setting analysis conditions and executing topology optimization. It can accurately consider the influence of contact loads and improve the accuracy and reliability of the optimized design, thereby designing an airbag bracket structure that meets high standards such as safety, stability and lightweight, reducing the modification and calculation workload of later designers and improving design efficiency and quality.

[0028] Further, as a refinement and extension of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process in this embodiment, another optimization design method for a truck airbag bracket is provided, and the method includes the following steps: S1. Build a design space for the airbag stent, and construct a three-dimensional geometric model of the airbag stent based on the design space; the specific steps of step S1 are as follows: S11. Determine the design space in the finite element software HyperMesh according to the overall layout of the vehicle and the functional requirements of the airbag bracket; It should be noted that the design space includes all possible positions and shape variations that the balloon stent may occupy; S12. A three-dimensional geometric model of the airbag stent is established in the finite element software HyperMesh according to the design space, wherein the three-dimensional geometric model omits the definition of the process and processing feature details, such as Figure 3 As shown; Exemplarily, the three-dimensional geometric model omits process and processing feature details such as chamfers and fillets; S13. Assemble the three-dimensional geometric model of the airbag bracket, the frame model, and the airbag model together according to the assembly requirements; It should be noted that by determining the design space to provide a basis for subsequent modeling and optimization, the definition of process and processing feature details is omitted, making it possible to build in finite element software, while simplifying the model complexity and improving the calculation efficiency; S2. In the finite element software, the three-dimensional geometric model of the airbag stent is cleaned, meshing is pre-processed, and connection relationships are established, and ROD units are used between contact surfaces instead of contact definitions to transfer contact loads; the specific steps of step S2 are as follows: S21. Import or open the assembled three-dimensional geometric model of the airbag bracket in the finite element software HyperMesh, and clean up the overlapping, missing or erroneous geometric elements in the three-dimensional geometric model of the airbag bracket; S22. Pre-processing the meshing of the three-dimensional geometric model of the balloon stent in the finite element software HyperMesh and establishing the connection relationship; S23. Determine the contact surface in the finite element software HyperMesh, and use ROD elements between the two contact surfaces instead of contact definition to transfer contact loads, such as Figure 4 As shown; It should be noted that the accuracy and reliability of the model are ensured by cleaning up the 3D geometric model and meshing, and the use of ROD units instead of contact definitions to transfer contact loads can simulate contact behavior and make the force of the airbag support structure more accurate; In addition, the ROD unit can be replaced by the SPRING unit; S3. Define the material properties, loads and boundary conditions of the three-dimensional geometric model of the airbag bracket, set the analysis conditions, define the topology optimization parameters and response parameters for each analysis condition, and set the constraints and optimization goals; the specific steps of step S3 are as follows: S31. Define the material properties of each mesh corresponding to the components in the three-dimensional geometric model of the airbag stent in the finite element software HyperMesh according to the actual material of the airbag stent; For example, the actual material of the airbag bracket is aluminum alloy or steel, etc., and the material properties defined in the finite element software may include density, elastic modulus or Poisson's ratio; S32. Define the load borne by the airbag bracket in the finite element software HyperMesh according to the actual load conditions during vehicle operation, and define the boundary conditions; Exemplarily, the load borne by the airbag bracket may include road excitation and load transmitted by the air suspension, and the defined boundary conditions may include fixed constraints or displacement constraints; S33. Setting analysis conditions in the finite element software HyperMesh, the analysis conditions including static strength analysis conditions, static stiffness analysis conditions, dynamic stiffness analysis conditions and modal analysis conditions; S34. defining topology optimization parameters for each analysis condition, wherein the topology optimization parameters include optimization space, minimum size, symmetry constraint, and draft direction; It should be noted that determining the optimization space is to determine the design area of ​​topology optimization, that is, which parts of the shape and size can be changed to optimize the performance. The minimum size is to set the minimum size allowed by the optimized structure to avoid the appearance of too small structural features. When the airbag bracket is symmetrical, symmetry constraints can be set to simplify the optimization process. In addition, according to the manufacturing process requirements, the draft direction is set to ensure that the optimized structure can be manufactured smoothly. S35. defining response parameters for each analysis condition, wherein the response parameters include volume fraction, displacement, modal frequency, and weighted flexibility; It should be noted that the volume fraction is the ratio of the optimized structure volume to the original structure volume, which is used to control the lightweight degree of the structure; the displacement is the displacement of each point of the structure under a specific load, which can evaluate the stiffness of the airbag support structure; the modal frequency is the natural frequency of the airbag support structure, which can evaluate the dynamic performance of the airbag support structure; the weighted flexibility is a comprehensive consideration of the flexibility of the structure under various working conditions, which can evaluate the overall performance of the airbag support structure; For example, the volume fraction may be replaced by the mass fraction; S36. Setting the minimum weighted flexibility as the optimization target, setting optimization constraints, the optimization constraints including displacement constraints, volume fraction constraints and frequency constraints; It should be noted that by defining material properties, loads, boundary conditions and analysis conditions, data support is provided for subsequent topology optimization, and setting reasonable topology optimization parameters and response parameters can ensure accurate execution of the optimization process; S4. Calculate the flexibility of the airbag support structure under each analysis condition, calculate the flexibility weighting coefficient after normalizing the flexibility of each analysis condition, and then construct a weighted flexibility expression of the airbag support structure; the specific steps of step S4 are as follows: S41. Calculate the flexibility of the structure between the airbags in each analysis condition , and the flexibility of each analysis condition is normalized by the following formula: ; in, is the minimum compliance of each analysis condition; S42. Calculate the flexibility weighting coefficient for each analysis condition using the following formula: : ; S43. Calculate the weighted flexibility of the three-dimensional model of the balloon stent defined in step S35 by the following formula: : ; Where N is the number of analysis conditions; It should be noted that flexibility normalization can eliminate the differences in flexibility dimensions under different working conditions so that the flexibility under each analysis condition can be compared and weighted. By calculating the weighted coefficient and constructing the weighted flexibility expression, the flexibility influence under each working condition is comprehensively considered, and the comprehensive execution of the optimization process is realized. S5. Perform topology optimization according to the optimization goal and weighted flexibility expression, and evaluate the optimization results until the design requirements and constraints are met; the specific steps of step S5 are as follows: S51. In the finite element software HyperMesh, according to the optimization goal of minimizing weighted flexibility, a topology optimization process is performed in combination with optimization constraints and weighted flexibility to obtain an optimized airbag support structure; S52. Evaluate the optimized balloon stent structure to check whether it meets all design requirements and constraints; If yes, go to step S54; If not, proceed to step S53; S53. Adjust the optimization parameters, constraints or flexibility weighting coefficients of each analysis condition according to the evaluation results, re-execute the optimization, and return to step S51; S54. Import the optimized airbag support structure into the 3D software for reconstruction, reassemble it for calculation under various analysis conditions, and make adjustments and improvements based on the calculation results; the entire optimization process is as follows Figure 5 As shown; It should be noted that the accuracy of the optimization results is ensured through topology optimization execution and evaluation, and the optimization parameters are adjusted according to the evaluation results to achieve iterative optimization and improve the optimization efficiency.

[0029] This embodiment constructs a simplified three-dimensional geometric model of the airbag bracket according to the design space; establishes a finite element calculation and analysis model of the strength, static stiffness, dynamic stiffness, and modal frequency of the airbag bracket based on the simplified three-dimensional geometric model of the design space constructed; and establishes an optimization design model that can replace contact behavior based on the finite element model of the strength, static stiffness, dynamic stiffness, and modal frequency of the airbag bracket. This embodiment establishes a calculation and analysis structure of the airbag bracket and its auxiliary support components, accurately describing the force environment of the airbag bracket; compared with the general topology optimization model that cannot consider the phenomenon of contact nonlinearity, by establishing a mechanical model that replaces contact, the boundary of the airbag bracket under various working conditions can be more accurately described; by establishing a mechanical model that replaces contact, the technical problem of the inconsistency between the topological analysis model of the airbag bracket and the actual structure can be effectively solved.

[0030] In an embodiment of the present invention, based on step S22, a possible embodiment is given below to illustrate its specific implementation scheme in a non-limiting manner.

[0031] The specific steps of step S22 are as follows: S221. Using SHELL units to mesh the sheet metal parts in the three-dimensional geometric model of the airbag bracket in the finite element software HyperMesh; S222. Using the finite element software HyperMesh to mesh the optimized design space using tetrahedral TETRA4 units in the three-dimensional geometric model of the balloon stent; S223. Using BEAM unit to simulate the connection relationship of the three-dimensional geometric model of the balloon stent in the finite element software HyperMesh; It should be noted that the accuracy and efficiency can be calculated by using appropriate mesh division units for sheet metal thin plates and optimized design space, respectively, while the use of BEAM units to simulate the connection relationship can accurately reflect the actual connection status of the airbag bracket.

[0032] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0033] like Figure 2 As shown, the following is an embodiment of the optimization design system of the truck airbag bracket provided in the embodiment of the present disclosure. The system and the optimization design method of the truck airbag bracket of the above-mentioned embodiments belong to the same inventive concept. For details not fully described in the embodiment of the optimization design system of the truck airbag bracket, please refer to the embodiment of the optimization design method of the truck airbag bracket mentioned above.

[0034] The system includes: A three-dimensional geometric model building module is used to build a design space of the airbag stent and build a three-dimensional geometric model of the airbag stent according to the design space; The 3D geometric model cleaning and pre-processing module is used to clean the 3D geometric model of the airbag bracket in the finite element software, pre-process the mesh division, and establish the connection relationship, and use ROD units instead of contact definitions between contact surfaces to transfer contact loads; The 3D geometric model analysis module is used to define the material properties, loads and boundary conditions of the 3D geometric model of the airbag bracket, set the analysis conditions, define the topology optimization parameters and response parameters for each analysis condition, and set the constraints and optimization goals; A weighted flexibility calculation module is used to calculate the flexibility of the airbag support structure under each analysis condition, and calculate the flexibility weighting coefficient after normalizing the flexibility of each analysis condition, and then construct a weighted flexibility expression of the airbag support structure; The airbag bracket optimization module is used to perform topology optimization according to the optimization objectives and weighted flexibility expressions, and evaluate the optimization results until the design requirements and constraints are met.

[0035] This embodiment realizes the automation and integration of the whole process from 3D geometric model construction to topology optimization and result evaluation through the collaborative work of various modules.

[0036] The optimization design method of the truck airbag bracket provided in the embodiment of the present application can be applied to electronic devices. Those skilled in the art will understand that the electronic device structure involved in the embodiment of the present invention does not constitute a limitation on the electronic device, and the electronic device may include more or fewer components than shown in the figure, or combine certain components, or arrange different components. In the embodiment of the present invention, the electronic device includes but is not limited to a laptop computer, a desktop computer, a workbench, a personal digital assistant, a server, a blade server, a mainframe computer, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the embodiments of the present application described and / or required herein.

[0037] The electronic device may include a processor, an external memory interface, an internal memory, a universal serial bus (USB) interface, a charging management module, a power management module, a battery, a wireless communication module, an audio module, a speaker, a microphone, a sensor module, buttons, a camera, a display, and a SIM card interface, etc.

[0038] It is to be understood that the structure illustrated in the embodiments of the present application does not constitute a specific limitation on the electronic device. In other embodiments of the present application, the electronic device may include more or fewer components than shown in the figure, or combine certain components, or split certain components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0039] The processor may include one or more processing units, for example, the processor may include a central processing unit (CPU), an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a memory, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Among them, different processing units may be independent devices or integrated into one or more processors.

[0040] The processor can be the nerve center and command center of the electronic device. The controller can generate an operation control signal according to the instruction operation code and timing signal to complete the control of fetching and executing instructions.

[0041] A memory may also be provided in the processor for storing instructions and data. In some embodiments, the memory in the processor is a cache memory. The memory may store instructions or data that the processor has just used or is cyclically used. If the processor needs to use the instruction or data again, it may be directly called from the memory. This avoids repeated access, reduces the waiting time of the processor, and thus improves system efficiency.

[0042] The above-mentioned electronic equipment realizes the optimization design method of the truck airbag bracket of the present application, builds the design space of the airbag bracket, and constructs the three-dimensional geometric model of the airbag bracket according to the design space; cleans the three-dimensional geometric model of the airbag bracket, pre-processes the mesh division and establishes the connection relationship in the finite element software, and uses ROD units instead of contact definitions between contact surfaces to transfer contact loads; defines the material properties, loads and boundary conditions of the three-dimensional geometric model of the airbag bracket, sets analysis conditions, defines topology optimization parameters and response parameters for each analysis condition, and sets constraints and optimization goals; calculates the structure of the airbag bracket in each analysis condition The flexibility of each analysis condition is calculated, and the flexibility weighted coefficient is calculated after normalizing the flexibility of each analysis condition, and then the weighted flexibility expression of the airbag bracket structure is constructed; topology optimization is performed according to the optimization goal and the weighted flexibility expression, and the optimization results are evaluated until the design requirements and constraint conditions are met. The technical solution is achieved by constructing a weighted flexibility expression and comprehensively considering the flexibility under each analysis condition, so that the optimized structure is more in line with the actual stress environment and improves the accuracy of the design. The optimized airbag bracket structure also achieves a lightweight design and can accurately handle contact nonlinear problems, breaking through the limitations of traditional topology optimization methods.

[0043] The storage medium provided in the present application stores a program product that can implement an optimization design method for a truck airbag bracket.

[0044] The optimization design method of the truck airbag bracket includes: building a design space of the airbag bracket, and constructing a three-dimensional geometric model of the airbag bracket according to the design space; cleaning the three-dimensional geometric model of the airbag bracket in finite element software, pre-processing the mesh division, and establishing the connection relationship, and using ROD units instead of contact definitions between contact surfaces to transfer contact loads; defining the material properties, loads and boundary conditions of the three-dimensional geometric model of the airbag bracket, setting analysis conditions, defining topology optimization parameters and response parameters for each analysis condition, and setting constraints and optimization goals; calculating the flexibility of the airbag bracket structure in each analysis condition, and calculating the flexibility weighting coefficient after normalizing the flexibility of each analysis condition, and then constructing a weighted flexibility expression for the airbag bracket structure; performing topology optimization according to the optimization goal and the weighted flexibility expression, and evaluating the optimization results until the design requirements and constraints are met.

[0045] In some possible embodiments, the optimization design method of the truck airbag bracket disclosed in the present invention can be implemented in the form of a program product, which includes a program code. When the program product is run on a terminal device, the program code is used to enable the terminal device to execute the steps described in the above "Exemplary Method" section of this specification according to various exemplary embodiments of the present disclosure.

[0046] The storage medium of the present disclosure can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0047] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An optimization design method for a truck airbag bracket, characterized in that: The steps include: S1. Build a design space for the airbag stent and construct a three-dimensional geometric model of the airbag stent based on the design space; S2. Clean up the three-dimensional geometric model of the airbag stent in the finite element software, perform pre-processing of meshing, and establish connection relationships, and use ROD units instead of contact definitions between contact surfaces to transfer contact loads; S3. Define the material properties, loads and boundary conditions of the three-dimensional geometric model of the airbag bracket, set the analysis conditions, define the topology optimization parameters and response parameters for each analysis condition, and set the constraints and optimization goals; S4. Calculate the flexibility of the airbag support structure in each analysis condition, calculate the flexibility weighting coefficient after normalizing the flexibility of each analysis condition, and then construct a weighted flexibility expression of the airbag support structure; S5. Perform topology optimization according to the optimization objective and the weighted flexibility expression, and evaluate the optimization results until the design requirements and constraints are met.

2. The optimization design method of the truck airbag bracket according to claim 1, characterized in that: The specific steps of step S1 are as follows: S11. Determine the design space in the finite element software HyperMesh according to the overall layout of the vehicle and the functional requirements of the airbag bracket; S12. Establishing a three-dimensional geometric model of the airbag stent according to the design space in the finite element software HyperMesh, wherein the three-dimensional geometric model omits the definition of process and processing feature details; S13. Assemble the three-dimensional geometric model of the airbag bracket, the vehicle frame model, and the airbag model according to assembly requirements.

3. The optimization design method of the truck airbag bracket according to claim 1, characterized in that: The specific steps of step S2 are as follows: S21. Import or open the assembled three-dimensional geometric model of the airbag bracket in the finite element software HyperMesh, and clean up the overlapping, missing or erroneous geometric elements in the three-dimensional geometric model of the airbag bracket; S22. Pre-processing the meshing of the three-dimensional geometric model of the balloon stent in the finite element software HyperMesh and establishing the connection relationship; S23. Determine the contact surface in the finite element software HyperMesh, and use ROD elements between the two contact surfaces instead of contact definition to transfer the contact load.

4. The optimization design method of the truck airbag bracket according to claim 3 is characterized in that: The specific steps of step S22 are as follows: S221. Using SHELL units to mesh the sheet metal parts in the three-dimensional geometric model of the airbag bracket in the finite element software HyperMesh; S222. Using the finite element software HyperMesh to mesh the optimized design space using tetrahedral TETRA4 units in the three-dimensional geometric model of the balloon stent; S223. Use BEAM units to simulate the connection relationship of the three-dimensional geometric model of the airbag bracket in the finite element software HyperMesh.

5. The optimization design method of the truck airbag bracket according to claim 3, characterized in that: The specific steps of step S3 are as follows: S31. Define the material properties of each mesh corresponding to the components in the three-dimensional geometric model of the airbag stent in the finite element software HyperMesh according to the actual material of the airbag stent; S32. Define the load borne by the airbag bracket in the finite element software HyperMesh according to the actual load conditions during vehicle operation, and define the boundary conditions; S33. Setting analysis conditions in the finite element software HyperMesh, the analysis conditions including static strength analysis conditions, static stiffness analysis conditions, dynamic stiffness analysis conditions and modal analysis conditions; S34. defining topology optimization parameters for each analysis condition, wherein the topology optimization parameters include optimization space, minimum size, symmetry constraint, and draft direction; S35. defining response parameters for each analysis condition, wherein the response parameters include volume fraction, displacement, modal frequency, and weighted flexibility; S36. Setting the minimum weighted flexibility as the optimization target, and setting optimization constraints, wherein the optimization constraints include displacement constraints, volume fraction constraints, and frequency constraints.

6. The optimization design method of the truck airbag bracket according to claim 5, characterized in that: The specific steps of step S4 are as follows: S41. Calculate the flexibility of the structure between the airbags in each analysis condition , and the flexibility of each analysis condition is normalized by the following formula: ； in, is the minimum compliance of each analysis condition; S42. Calculate the flexibility weighting coefficient for each analysis condition using the following formula: : ； S43. Calculate the weighted flexibility of the three-dimensional model of the balloon stent defined in step S35 by the following formula: : ； Where N is the number of analysis cases.

7. The optimization design method of the truck airbag bracket according to claim 6, characterized in that: The specific steps of step S5 are as follows: S51. In the finite element software HyperMesh, according to the optimization goal of minimizing weighted flexibility, a topology optimization process is performed in combination with optimization constraints and weighted flexibility to obtain an optimized airbag support structure; S52. Evaluate the optimized balloon stent structure to check whether it meets all design requirements and constraints; If yes, go to step S54; If not, proceed to step S53; S53. Adjust the optimization parameters, constraints or flexibility weighting coefficients of each analysis condition according to the evaluation results, re-execute the optimization, and return to step S51; S54. Import the optimized airbag support structure into the three-dimensional software for reconstruction, and reassemble it for calculation under various analysis conditions, and make adjustments and improvements based on the calculation results.

8. An optimization design system for a truck airbag bracket, characterized in that: include: A three-dimensional geometric model building module is used to build a design space of the airbag stent and build a three-dimensional geometric model of the airbag stent according to the design space; The 3D geometric model cleaning and pre-processing module is used to clean the 3D geometric model of the airbag bracket in the finite element software, pre-process the mesh division, and establish the connection relationship, and use ROD units instead of contact definitions between contact surfaces to transfer contact loads; The 3D geometric model analysis module is used to define the material properties, loads and boundary conditions of the 3D geometric model of the airbag bracket, set the analysis conditions, define the topology optimization parameters and response parameters for each analysis condition, and set the constraints and optimization goals; A weighted flexibility calculation module is used to calculate the flexibility of the airbag support structure under each analysis condition, calculate the flexibility weighting coefficient after normalizing the flexibility of each analysis condition, and then construct a weighted flexibility expression of the airbag support structure; The airbag bracket optimization module is used to perform topology optimization according to the optimization objectives and weighted flexibility expressions, and evaluate the optimization results until the design requirements and constraints are met.

9. An electronic device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the optimization design method of the truck airbag bracket as claimed in any one of claims 1 to 7 when executing the program.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for optimizing the design of the truck airbag bracket according to any one of claims 1 to 7 are implemented.

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