An interior and exterior precise design joint simulation method, system, device and storage medium for automobiles

Abstract

The application provides an automobile interior and exterior precise design joint simulation method, system, equipment and storage medium, comprising: assembly 3D data input, structure simulation modeling, multi-working-condition topology optimization analysis, modal, stiffness performance requirement judgment, first-type structure strength optimization analysis, first-type structure strength requirement judgment, second-type structure strength optimization analysis, second-type structure strength requirement judgment, model output unit forming process optimization analysis and forming process performance requirement judgment. Through the scheme provided by the application, a precise structure design scheme of an interior and exterior assembly product can be quickly recommended, the simulation analysis working hours and the amount of raw materials of the assembly product in the development stage can be saved, and therefore the simulation analysis efficiency in the early stage is improved and the cost of raw materials of the assembly is reduced.

Description

Technical Background

[0001] This application belongs to the field of structural simulation analysis technology, specifically involving the simulation analysis of automotive interior and exterior trim assemblies. Background Technology

[0002] In existing technologies, such as Figure 1 As shown, the precise design of automotive interior and exterior trim assemblies relies heavily on engineers' experience, requiring a large amount of empirical numerical input. This increases the workload for simulation engineers, who must repeatedly perform steps 3 to 16, thus extending the analysis cycle. The structural performance simulation analysis and process performance simulation analysis of the interior and exterior trim assemblies are conducted separately and in parallel, specifically steps 2 to 17 and 18 to 21, respectively. The lack of cross-evaluation between these two methods in the early stages leads to insufficient scheme verification, resulting in the repeated performance simulation verification of molding processes in steps 22, 23, 19, 20, and 21 for large-scale products. Given these factors, the existing technology for obtaining precise design structural schemes for automotive interior and exterior trim assemblies involves a repetitive path, heavily reliant on engineers' experience; and the structural performance simulation analysis and process performance simulation analysis are not effectively integrated, resulting in low analysis efficiency.

[0003] Therefore, it is necessary to seek new joint simulation methods for precise design of interior and exterior trim, integrating structural performance simulation analysis and process performance simulation analysis of interior and exterior trim, aiming to achieve the requirements of structural rigidity, strength performance and molding process performance, quickly recommend precise structural design schemes for interior and exterior trim assemblies, and improve analysis efficiency.

[0004] Current methods for precise interior and exterior trim design rely heavily on engineers' experience, requiring extensive input of empirical data. This increases the workload and cycle time for simulation engineers to perform repeated analyses. Existing methods involve conducting structural performance simulation analysis and process performance simulation analysis of interior and exterior trim separately in parallel. The lack of cross-evaluation between the two in the early stages leads to insufficient validation of the design, resulting in repeated process performance simulation verification for large-scale products in later stages. Current technologies cannot quickly achieve the goal of precise interior and exterior trim design. Summary of the Invention

[0005] The purpose of this application is to provide a method, system, equipment, and storage medium for precise design of automotive interior and exterior trim. The solution provided in this application can quickly recommend precise structural design schemes for interior and exterior trim assemblies, thereby saving simulation analysis time and raw material usage in the early stage of development, thus improving the efficiency of early simulation analysis and reducing the cost of raw materials for assemblies.

[0006] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0007] In a first aspect, this application provides a joint simulation method for precise design of automotive interior and exterior trim, the simulation method comprising the following steps:

[0008] Step A. Assembly 3D Data Input:

[0009] The input 3D data for the assembly product should include 3D data for the interior and exterior trim assemblies and the corresponding component assemblies. The 3D data for the assembly should have a detailed structural plan. Typically, the detailed structural plan includes the mounting structure, reinforcement structure, flange structure, etc., as well as the specified structural wall thickness.

[0010] Step B. Structural simulation modeling:

[0011] Using modeling software, CAE modeling is performed on the 3D data of the assembly input in step A. The modeling mesh type, mesh size, and mesh aspect ratio are limited according to the overall dimensions of each product.

[0012] The modeling software used in this application includes, but is not limited to, HyperMesh, Abaqus, Ansys, Nastran, Tosca, etc.

[0013] Step C. Multi-condition topology optimization analysis:

[0014] Based on the CAE model established in step B, the structural optimization design module of the engineering simulation software is applied. The structural wall thickness of all components of the interior and exterior trim assembly is used as the optimization variable. All modalities, stiffness conditions, and optimization objectives of the assembly are loaded into the CAE model. With the goal of achieving all modal and stiffness performance requirements as the premise of accurate design and minimizing the total weight of the interior and exterior trim assembly as the objective, multi-condition topology optimization calculation and analysis are carried out to complete all modal and stiffness condition analyses in one go.

[0015] In this application, the structural optimization design module can be the OptiStruct module of HyperWorks software.

[0016] Step D. Evaluation of Modal and Stiffness Performance Requirements:

[0017] Based on the modal and stiffness performance requirements of the assembly, the results of multi-condition topology optimization analysis are evaluated, and recommended results for the structural wall thickness distribution in each region of the assembly are identified.

[0018] If the analysis results meet the assembly modal and stiffness requirements, proceed to step E. If the analysis results do not meet the assembly modal and stiffness requirements, optimize and adjust the corresponding structural wall thickness values ​​based on the recommended values ​​for the structural wall thickness distribution in each region of the assembly in the analysis results, and return to step C until the evaluation requirements are met.

[0019] Step E. Strength optimization analysis of the first type of structure:

[0020] Typically, there are two types of situations in structural strength analysis: one is that the same area of ​​a component assembly has different loading conditions, and the other is that a certain area of ​​a component assembly has only a single loading condition.

[0021] This application classifies components in the same area of ​​the assembly that have different loading conditions as the first type of structural strength analysis item. This type of strength analysis item can be combined for analysis. In modeling software, the model is converted to a structural mechanics analysis module, such as the Abaqus module, and structural mechanics software is used to perform structural strength optimization analysis of the assembly.

[0022] Step F. Evaluation of Strength Requirements for Type I Structures:

[0023] The analysis results are evaluated based on the performance requirements of the first type of structural strength. If the analysis results meet the overall structural strength requirements, proceed to step G. If the analysis results do not meet the overall structural strength requirements, optimize the structural scheme and return to step E until the evaluation requirements are met.

[0024] Step G. Strength optimization analysis of the second type of structure:

[0025] The single loading condition of a certain area of ​​the component assembly is taken as the second type of structural strength analysis item. This type of strength analysis item can only be analyzed one by one. Therefore, the structural strength solution optimization analysis of the assembly is carried out separately.

[0026] Step H. Evaluation of the strength requirements for the second type of structure:

[0027] The analysis results are evaluated based on the performance requirements of the second type of structural strength. If the analysis results meet the overall structural strength requirements, proceed to step I. If the analysis results do not meet the overall structural strength requirements, optimize the structural scheme and return to step G until the evaluation requirements are met.

[0028] Step I. Output Model:

[0029] In the structural mechanics analysis module of the modeling software, the CAE models of each product component that meet the performance requirements of the preceding structure are converted and output as model files suitable for molding process analysis.

[0030] The structural mechanics analysis module here can be the Abaqus module of the HyperMesh software, and the output model file suitable for molding process analysis can be a UDM model file.

[0031] Step J. Molding process optimization analysis:

[0032] Import the molding process model files output from step I into molding process analysis software, including but not limited to MoldFlow, Moldex3D, etc., to carry out molding process optimization analysis.

[0033] Step K. Evaluation of Molding Process Performance Requirements:

[0034] The molding process analysis results are evaluated based on the product's molding process performance requirements. If the analysis results meet the product's molding process requirements, the co-simulation ends. If the analysis results do not meet the product's molding process requirements, the process and structural scheme are optimized, and the process returns to step J until the evaluation requirements are met.

[0035] In a second aspect, this application also provides a joint simulation system for precise design of automotive interior and exterior trim. The system includes: an assembly 3D data input unit, a structural simulation modeling unit, a multi-condition topology optimization analysis unit, a modal and stiffness performance requirement evaluation unit, a first type of structural strength optimization analysis unit, a first type of structural strength requirement evaluation unit, a second type of structural strength optimization analysis unit, a second type of structural strength requirement evaluation unit, a model output unit, a molding process optimization analysis unit, and a molding process performance requirement evaluation unit.

[0036] In a third aspect, this application also provides a computer device, the computer device including a memory and a processor, the memory storing a computer program, which, when executed by the processor, causes the processor to perform the steps of the above-described joint simulation method for precise design of automotive interior and exterior trim.

[0037] In a fourth aspect, this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, causes the processor to perform the steps of the co-simulation method for precise design of automotive interior and exterior trim as described in the first aspect of this application.

[0038] The technical effects of this application include at least the following:

[0039] 1. By replacing the existing technology of analyzing all modal and stiffness performance conditions one by one through one-time multi-condition topology optimization analysis, the precise design analysis of automotive interior and exterior trim assemblies is achieved and the analysis efficiency is improved.

[0040] Current methods for precise interior and exterior design rely heavily on engineers' experience and extensive numerical input based on experience. This involves analyzing and verifying structural performance item by item, increasing the workload and cycle time for simulation engineers. This application employs a one-time multi-condition topology optimization technique to simultaneously optimize the performance of multiple structures, outputting a structural optimization scheme that meets all structural performance targets in a single step. This effectively reduces the workload and cycle time of analysis.

[0041] 2. By outputting control point systems through the solution process, multiple structural strength conditions can be combined for analysis, thereby improving analysis efficiency.

[0042] In existing simulation analyses of interior and exterior structural performance, different loading conditions in the same area of ​​component assemblies are typically analyzed separately for each structural strength condition, resulting in low analysis efficiency. This proposed solution treats different loading conditions in the same area of ​​component assemblies as the same type of structural strength analysis item, merging these items for analysis. The maximum load condition is selected as the solution analysis item, and multiple corresponding control points are added through the output control point system during the solution analysis of the maximum load condition. This significantly improves analysis efficiency for structural assemblies with numerous load conditions.

[0043] 3. By using model conversion to achieve joint simulation, the repeated verification of post-molding process performance in existing technologies can be avoided, thereby improving the efficiency of structural performance and molding process performance optimization analysis of automotive interior and exterior trim assemblies.

[0044] Currently, structural performance simulation analysis and process performance simulation analysis of interior and exterior trim are conducted separately and in parallel, lacking cross-evaluation. This leads to insufficient verification of the solutions and results in repeated process performance simulation verification for large products in later stages. This application addresses this issue by first precisely optimizing the structural performance of interior and exterior trim through structural simulation, and then importing the product structure solution that aims to achieve the structural performance target into the process performance simulation analysis for optimization. This allows for effective integration and evaluation of the two, avoiding the redundant verification work of existing technologies and achieving joint simulation.

[0045] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0046] Figure 1 Flowchart of existing methods for simulating the structural performance and process performance of interior and exterior trim.

[0047] Figure 2 Flowchart of the joint simulation method for precise design of interior and exterior trim.

[0048] Figure 3 : Schematic diagram of plastic front-end module assembly and its components (3D data).

[0049] Figure 4 Recommended structural wall thickness coefficient diagram for multi-condition topology optimization analysis.

[0050] Figure 5 : Process result output control point system interface diagram.

[0051] Figure 6 : Process result output control point input interface diagram.

[0052] Figure 7: Output file image.

[0053] Figure 8 : Diagram of the control point input interface for multi-process result output.

[0054] Figure 9 The goal is to achieve the structural performance of the plastic front-end frame assembly.

[0055] Figure 10 The goal is to achieve the molding process performance of the plastic front-end frame assembly.

[0056] It should be noted that the above figures are for better understanding of this solution and do not constitute a limitation of this application. Detailed Implementation

[0057] To enable those skilled in the art to better understand the method of this application, the method of this application will be further described below with reference to the accompanying drawings.

[0058] It should be understood that the following are specific examples illustrating the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0059] In addition, the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0060] Example 1:

[0061] The content of one embodiment of this application is as follows: Figure 2 The diagram illustrates the overall workflow of a co-simulation method for precise design of automotive interior and exterior trim, including the following steps:

[0062] Step A. Assembly 3D Data Input:

[0063] The input 3D data for the assembly product should include 3D data for the interior and exterior trim assemblies and the corresponding component assemblies. The 3D data for the assembly should have a detailed structural plan. Typically, the detailed structural plan includes the mounting structure, reinforcement structure, flange structure, etc., as well as the specified structural wall thickness.

[0064] Taking the plastic front-end module assembly as an example, such as Figure 3As shown. The input product assembly 3D data includes plastic front end module assembly data 1, and the input opponent component assembly 3D data includes signal light assembly data 2, radiator assembly data 3, front collision beam assembly data 4, high and low beam headlight assembly data 5, and front hood lock reinforcement bracket data 6. The product assembly data includes detailed structural schemes: Plastic front-end module assembly data 1, featuring mounting structures such as 1-1, reinforcing rib structures such as 1-2, and flanged structures such as 1-3; Signal light assembly data 2, featuring mounting structures such as 2-1, reinforcing rib structures such as 2-2, and flanged structures such as 2-3; Radiator assembly data 3, featuring mounting structures such as 3-1, reinforcing structures such as 3-2, and flanged structures such as 3-3; Front collision beam assembly data 4, featuring mounting structures such as 4-1, reinforcing rib structures such as 4-2, and flanged structures such as 4-3; High and low beam headlight assembly data 5, featuring mounting structures such as 5-1, reinforcing rib structures such as 5-2, and flanged structures such as 5-3; Front cover lock reinforcement bracket data 6, featuring mounting structures such as 6-1, flanged structures such as 6-2, and hole-reinforced flanged structures such as 6-3. The wall thickness values ​​of each structure in the assembly product can be obtained through 3D measurement software.

[0065] Step B. Structural simulation modeling:

[0066] Using existing modeling software, including but not limited to HyperMesh, Abaqus, Ansys, Nastran, and Tosca, perform CAE modeling on the assembly 3D data input in step A. The modeling requirements are as follows:

[0067] (1) The model type is midsurface, such as "midsurface" in HyperMesh software.

[0068] (2) The model mesh element type is "quadrilateral + triangle", and the proportion of triangle mesh elements is ≤5%.

[0069] (3) Grid size: The grid size for large products is 6mm to 8mm, and the grid size for medium and small products is 3mm to 5mm.

[0070] (4) The aspect ratio of the grid cells is ≤5.

[0071] The above modeling requirements aim to optimize both modeling efficiency and iterative efficiency of analysis and computation while meeting the accuracy needs of subsequent simulations.

[0072] Compared with existing technologies, the process simulation model can be transformed in subsequent step I without requiring the implementation of existing technologies. Figure 1 The work on “18. Process Simulation Modeling” is underway.

[0073] Step C. Multi-condition topology optimization analysis:

[0074] Based on the CAE model established in step B, the structural optimization design module of engineering simulation software, such as the OptiStruct module in HyperWorks, is applied. Topology optimization is selected, for example, the "topology" option within the OptiStruct module. The wall thickness of all components in the interior and exterior trim assembly is used as the optimization variable. All modal and stiffness conditions of the assembly, along with their corresponding performance target values, are loaded into the CAE model. With the goal of achieving accurate design based on all modal and stiffness performance requirements, and minimizing the total weight of the interior and exterior trim assembly, multi-condition topology optimization calculations and analyses are performed, completing all modal and stiffness condition analyses in one go.

[0075] Traditional structural optimization techniques in the interior and exterior trim industry involve multi-factor morphology optimization, with optimization factors including shape, structural form, and structural wall thickness. This approach offers high design freedom but also results in lengthy analysis and iteration times and complex result acquisition. In contrast, this technique employs single-factor topology optimization, selecting only the structural wall thickness of the interior and exterior trim products as the optimization factor. This results in high analysis and iteration efficiency and easy result acquisition.

[0076] This step allows for the simultaneous completion of existing technologies. Figure 1 The steps consist of 3 to 10 work items. If there are more modal or stiffness analysis items, these can be entered simultaneously to perform multi-condition topology optimization analysis.

[0077] Taking the analysis of the plastic front-end module assembly as an example, the modal and stiffness condition analysis items for the plastic front-end module assembly include ① first-order global mode, ② headlight bracket stiffness in one direction, ③ headlight bracket stiffness in two directions, ④ radiator mounting point stiffness in one direction, ⑤ radiator mounting point stiffness in two directions, ⑥ front hood lock stiffness in one direction, and ⑦ front hood lock stiffness in two directions. Therefore, conditions ①②③④⑤⑥⑦ can all be simultaneously input into this step to perform multi-condition topology optimization analysis, completing all modal and stiffness condition analyses in one go.

[0078] Step D. Evaluation of Modal and Stiffness Performance Requirements:

[0079] Based on multi-condition topology optimization calculations, the recommended wall thickness distribution of structural components in various regions of the assembly is identified. Figure 4 For example: If the recommended wall thickness coefficient for the upper part of the region is 1, then the recommended wall thickness value for this region is the original wall thickness value t × 1 = t; if the recommended wall thickness coefficient for the lower part of the region is 0.78, then the recommended wall thickness value for this region is the original wall thickness value t × 0.78 = 0.78t.

[0080] Based on the modal and stiffness performance requirements of the assembly, the results of the multi-condition topology optimization analysis are evaluated. If the analysis results meet the modal and stiffness requirements of the assembly, proceed to step E. If the analysis results do not meet the modal and stiffness requirements of the assembly, optimize and adjust the structural wall thickness values ​​of the corresponding regions according to the recommended values ​​of structural wall thickness distribution in each region of the assembly in the analysis results, and return to step C until the evaluation requirements are met.

[0081] Step E. Strength optimization analysis of the first type of structure:

[0082] Structural strength analysis items with different loading conditions in the same area of ​​the component assembly are classified as the first type of structural strength analysis item. These types of strength analysis items can be combined for analysis. For example, structural strength analysis items 1 and 2 represent the same area of ​​the component assembly under different loading conditions, respectively. These types of strength analysis items can be combined for analysis.

[0083] In modeling software, the model is converted to a structural mechanics analysis module, such as the Abaqus module, and the structural mechanics analysis software is used to perform optimization analysis of the structural strength 1 and 2 for this type of structure.

[0084] Specifically, for this type of strength loading condition, the maximum load value condition is selected as the solution analysis item. Multiple corresponding control points are added through the output control point system of the solution process results. During the solution analysis of the maximum load condition, the analysis results of the control points corresponding to the small load conditions are output.

[0085] Taking the analysis of the plastic front-end module assembly as an example, there are two structural strength analysis items in region I of the plastic front-end module assembly. Structural strength 1 is the strength condition of region I under a load of 3570N, and structural strength 2 is the strength condition of region I under a load of 5000N. Therefore, only structural strength 2 under the maximum load condition of region I of the plastic front-end module assembly needs to be selected as the analysis item. The control point system is output through the solution process, such as... Figure 5 As shown, in the structural strength analysis under condition 2, the input process result control point is 3570N / 5000N=0.714, as... Figure 6 As shown. The output file of the solution results is as follows. Figure 7 As shown, the output of process control point 0.714 is the result of structural strength 1 of region I of the plastic front-end module assembly under a load of 3570N. The final result of the analysis file is the result of structural strength 2 of region I of the plastic front-end module assembly under a load of 5000N. That is, during the analysis of structural strength 2 of region I of the plastic front-end module assembly, the analysis result of structural strength 1 of region I of the plastic front-end module assembly can be output, and the analysis of structural strength 1 and 2 of region I of the plastic front-end module assembly can be completed simultaneously.

[0086] Similarly, if there are multiple strength loading conditions with different loads in the same area, multiple corresponding control points can be added through the control point system output from the solution process, such as... Figure 8 As shown, the analysis results for multiple small load conditions are output during the solution and analysis process of the maximum load condition.

[0087] Step F. Evaluation of Strength Requirements for Type I Structures:

[0088] The analysis results are evaluated based on structural strength requirements 1 and 2. If the analysis results meet the structural strength requirements 1 and 2, proceed to step G. If the analysis results do not meet the structural strength requirements 1 and 2, optimize the structural scheme and return to step E until the evaluation requirements are met.

[0089] Step G. Strength optimization analysis of the second type of structure:

[0090] The single loading condition of a certain area of ​​the component assembly is treated as a second type of structural strength analysis item, and optimization analysis is carried out separately for each item.

[0091] For example, structural strength analysis item 3 represents a single loading condition in a certain area of ​​a component assembly. This type of strength analysis item can only be analyzed individually. Structural mechanics analysis software is used to perform optimization analysis of the assembly's structural strength analysis item 3.

[0092] Taking the analysis of the plastic front-end module assembly as an example, there is only one structural strength analysis item for region II and region III of the plastic front-end module assembly. The structural strength analysis of region II and region III of the plastic front-end module assembly are then performed separately.

[0093] Step H. Evaluation of the strength requirements for the second type of structure:

[0094] The analysis results are evaluated based on the structural strength requirement 3. If the analysis results meet the structural strength requirement 3, proceed to step I. If the analysis results do not meet the structural strength requirement 3, optimize the structural scheme and return to step G until the evaluation requirements are met.

[0095] Step I. Output Model:

[0096] In the structural mechanics analysis module of the modeling software, such as the Abaqus module in HyperMesh, convert all CAE model mesh elements of the interior and exterior trim parts that meet the performance requirements of the preceding structure into triangular elements. Switch the modeling software module to the molding process module, such as the HyperMold Moldflow module in HyperMesh. Under the molding process module, convert the above all-triangular mesh elements of the interior and exterior trim parts and output a model file suitable for molding process analysis, such as a UDM model file suitable for molding process analysis.

[0097] Compared with existing technologies, this step transforms and inherits the recommended scheme model, which has already undergone precise structural performance topology optimization design, into subsequent steps for molding process optimization analysis, eliminating the need for further steps. Figure 1 The "22. Differentiated Assessment" and related work.

[0098] Step J. Molding process optimization analysis:

[0099] Import the molding process model files output from step I into molding process analysis software, including but not limited to MoldFlow and Moldex3D, to conduct molding process optimization analysis. The main analysis items include gate layout rationality, injection pressure assessment, clamping force assessment, surface quality assessment, and product deformation assessment.

[0100] Step K. Evaluation of Molding Process Performance Requirements:

[0101] The molding process analysis results are evaluated based on the product's molding process performance requirements. If the analysis results meet the product's molding process requirements, the co-simulation ends. If the analysis results do not meet the product's molding process requirements, the process and structural scheme are optimized, and the process returns to step J until the evaluation requirements are met.

[0102] Example 2:

[0103] This embodiment provides a joint simulation system for precise design of automotive interior and exterior trim, which includes the following functional units:

[0104] The assembly 3D data input unit is used to input 3D data of the interior and exterior trim assemblies and related component assemblies to complete the detailed structural design. This detailed structural design includes the mounting structure, reinforcement structure, flange structure, and defined structural wall thicknesses.

[0105] The structural simulation modeling unit is used to perform CAE modeling on the input assembly 3D data, and limits the modeling mesh type, mesh size, and mesh aspect ratio according to the overall dimensions of each product.

[0106] The multi-condition topology optimization analysis unit is used to load all modal and stiffness conditions and optimization objectives of the assembly into the CAE model, with the structural wall thickness of all components of the interior and exterior trim assembly as the optimization variable. The goal is to achieve the required values ​​of all modal and stiffness performance for accurate design, and to minimize the total weight of the interior and exterior trim assembly. The unit performs multi-condition topology optimization calculation and analysis, and completes the analysis of all modal and stiffness conditions in one go.

[0107] The modal and stiffness performance requirement evaluation unit is used to evaluate the results of multi-condition topology optimization analysis based on the modal and stiffness performance requirements of the assembly, and to identify the recommended results of structural wall thickness distribution in each region of the assembly.

[0108] The first type of structural strength optimization analysis unit is used to combine components and assemblies with the same area but different loading conditions as first type of structural strength analysis items and perform optimization analysis.

[0109] The first type of structural strength requirement evaluation unit is used to evaluate the analysis results based on the performance requirements of the structural strength of each assembly.

[0110] The second type of structural strength optimization analysis unit is used to treat a single loading condition in a certain area of ​​the component assembly as a second type of structural strength analysis item, and to perform optimization analysis on a separate basis.

[0111] The second type of structural strength requirement evaluation unit is used to evaluate the analysis results based on the performance requirements of the second type of structural strength.

[0112] The model output unit is used to output the model files for each molding process.

[0113] The molding process optimization and analysis unit is used to import the output molding process model files into the molding process analysis software to carry out molding process optimization analysis.

[0114] The molding process performance requirement evaluation unit is used to evaluate the molding process analysis results based on the product molding process performance requirements.

[0115] The applicant tested the above methods in actual design work, taking the plastic front-end frame assembly as an example, and applied the joint simulation method of precise design of automotive interior and exterior trim to analyze and optimize the plastic front-end frame assembly. The results are as follows:

[0116] 1. For example Figure 8 , Figure 9 As shown, the Wangmu project achieves precise design optimization of the plastic front-end frame assembly's structural performance and molding process performance. The weight of the plastic front-end frame assembly has been reduced from 6183g to 5608g, a reduction of 575g, saving approximately 9 yuan in raw material costs. Extending this to the entire automotive interior and exterior trim system, the weight reduction is approximately 3000g per vehicle, saving approximately 45 yuan in raw material costs per vehicle. Based on 6 projects per year and annual sales of 100,000 vehicles per project, the total saving in raw material costs could reach 27 million yuan per year.

[0117] 2. A one-time multi-condition topology optimization analysis replaces the existing technology's item-by-item analysis of all modal and stiffness performance conditions. By outputting control point systems from the solution process results, multiple structural strength conditions are combined for analysis. Model transformation enables co-simulation, avoiding the repetitive verification of post-molding process performance in existing technologies, thus improving the efficiency of optimizing the structural performance and molding process performance of automotive interior and exterior trim assemblies. Calculations show an efficiency improvement of approximately 25%.

[0118] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A joint simulation method for precise design of automotive interior and exterior trim, characterized in that, By first performing precise optimization through simulation of the internal and external structural performance, and then importing the product structure scheme that aims to achieve the structural performance target into the process performance simulation analysis and optimization, joint simulation is achieved; this includes the following steps: Step A. Input 3D assembly data, including 3D data of interior and exterior trim assemblies and counterpart component assemblies; Step B. Perform structural simulation modeling on the input 3D assembly data; Step C. Multi-condition topology optimization analysis: Single-factor topology optimization, using the structural wall thickness of all components of the interior and exterior trim assembly as the optimization variable, loads all modal and stiffness conditions of the assembly and optimization objectives into the CAE model. With the goal of achieving all modal and stiffness performance requirements as the premise of accurate design and minimizing the total weight of the interior and exterior trim assembly as the objective, multi-condition topology optimization calculation and analysis is carried out to complete all modal and stiffness condition analyses in one go; Step D. Evaluation of Modal and Stiffness Performance Requirements: Based on the modal and stiffness performance requirements of the assembly, evaluate the results of the multi-condition topology optimization analysis and identify the recommended results for the structural wall thickness distribution in each region of the assembly; Step E. Strength Optimization Analysis of Type I Structures: The same area of ​​the component assembly but different loading conditions are taken as the first type of structural strength analysis item, and the solution optimization analysis is carried out in a combined manner. Specifically, for this type of strength loading condition, the maximum load value condition is selected as the solution analysis item. Multiple corresponding control points are added through the output control point system of the solution process results. During the solution analysis of the maximum load condition, the analysis results of the control points corresponding to the small load conditions are output. Step F. Evaluation of the first type of structural strength requirements: Evaluate the analysis results based on the performance requirements of the structural strength of each assembly; Step G. Second type of structural strength optimization analysis: Take a single loading condition of a certain area of ​​the component assembly as the second type of structural strength analysis item, and perform optimization analysis on a separate basis; Step H. Evaluation of the strength requirements of the second type of structure: Evaluate the analysis results based on the performance requirements of the second type of structure strength; Step 1. Output Model: In the structural mechanics analysis module of the modeling software, convert all the CAE model mesh elements of each product component that meet the performance requirements of the preceding structure into triangular mesh elements. Switch the modeling software module to the molding process module. In the molding process module, convert the above triangular mesh elements and output a model file suitable for molding process analysis. Step J. Molding process optimization analysis: Import the molding process model files output in Step I into the molding process analysis software to carry out molding process optimization analysis; Step K. Evaluation of Molding Process Performance Requirements: Evaluate the molding process analysis results based on the product molding process performance requirements.

2. The joint simulation method for precise design of automotive interior and exterior trim according to claim 1, characterized in that, In step A, the input assembly 3D data should have a detailed structural plan, which includes the installation structure, reinforcement structure, flange structure, and a clearly defined structural wall thickness.

3. The joint simulation method for precise design of automotive interior and exterior trim according to claim 1, characterized in that, Step B includes performing CAE modeling on the input assembly 3D data, and limiting the modeling mesh type, mesh size, and mesh aspect ratio according to the overall dimensions of each product.

4. The joint simulation method for precise design of automotive interior and exterior trim according to claim 1, characterized in that, In step D, if the analysis results meet the requirements for assembly modality and stiffness, proceed to step E; if the analysis results do not meet the requirements for assembly modality and stiffness, optimize and adjust the corresponding structural wall thickness values ​​according to the recommended values ​​of structural wall thickness distribution in each region of the assembly in the analysis results, and return to step C until the evaluation requirements are met.

5. The joint simulation method for precise design of automotive interior and exterior trim according to claim 1, characterized in that, In step F, if the analysis results meet the corresponding assembly structural strength requirements, proceed to step G; if the analysis results do not meet the corresponding assembly structural strength requirements, optimize the structural scheme and return to step E until it meets the evaluation requirements.

6. The joint simulation method for precise design of automotive interior and exterior trim according to claim 1, characterized in that, If the analysis results in step H meet the corresponding assembly structural strength requirements, then proceed to step I; if the analysis results do not meet the corresponding assembly structural strength requirements, then optimize the structural scheme and return to step G until it meets the evaluation requirements.

7. The joint simulation method for precise design of automotive interior and exterior trim according to claim 1, characterized in that, In step K, if the analysis results meet the requirements of each molding process of the product, the joint simulation ends; if the analysis results do not meet the requirements of each molding process of the product, the process and structural scheme are optimized, and the process returns to step J until the evaluation requirements are met.

8. The method for joint simulation of precise design of automotive interior and exterior trim according to any one of claims 1-7, characterized in that, The simulation modeling software used for the structural simulation modeling includes, but is not limited to, HyperMesh, Abaqus, Ansys, Nastran, and Tosca.

9. The joint simulation method for precise design of automotive interior and exterior trim according to any one of claims 1-7, characterized in that, The molding process analysis software includes, but is not limited to, MoldFlow and Moldex3D software.

10. A joint simulation system for precise design of automotive interior and exterior trim, characterized in that, By first performing precise optimization through interior and exterior structural performance simulation, and then importing the product structure scheme that aims to achieve the structural performance target into the process performance simulation analysis and optimization, a joint simulation is achieved. The system includes: The assembly 3D data input unit is used to input 3D data of interior and exterior trim assemblies and component assemblies. The assembly 3D data has a detailed structural scheme. The structural simulation modeling unit is used to perform CAE modeling on the input 3D assembly data. The multi-condition topology optimization analysis unit adopts single-factor topology optimization, using the structural wall thickness of all components of the interior and exterior trim assembly as the optimization variable. It loads all modal and stiffness conditions and optimization objectives of the assembly into the CAE model. With the goal of achieving all modal and stiffness performance requirements as the premise of accurate design and minimizing the total weight of the interior and exterior trim assembly as the objective, it conducts multi-condition topology optimization calculation and analysis, and completes the analysis of all modal and stiffness conditions in one go. The modal and stiffness performance requirement evaluation unit is used to evaluate the multi-condition topology optimization analysis results based on the modal and stiffness performance requirements of the assembly, and to identify the recommended results for the structural wall thickness distribution in each region of the assembly. The first type of structural strength optimization analysis unit is used to take the same area of ​​the component assembly but different loading conditions as the first type of structural strength analysis items and combine them for solution optimization analysis; specifically, for this type of strength loading condition, the maximum load value condition is selected as the solution analysis item, and multiple corresponding control points are added through the output control point system of the solution process results. During the solution analysis of the maximum load condition, the analysis results of the control points corresponding to the small load conditions are output. The first type of structural strength requirement evaluation unit is used to evaluate the analysis results based on the performance requirements of the structural strength of each assembly. The second type of structural strength optimization analysis unit is used to treat a single loading condition in a certain area of ​​the component assembly as a second type of structural strength analysis item, and to perform optimization analysis on each item separately. The second type of structural strength requirement evaluation unit is used to evaluate the analysis results based on the performance requirements of the second type of structural strength. In the model output unit, within the structural mechanics analysis module of the modeling software, all CAE model mesh elements of each product component that meet the performance requirements of the preceding structure are converted into triangular mesh elements. The modeling software module is then switched to the molding process module. Under the molding process module, the above triangular mesh elements are converted and output into model files suitable for molding process analysis. The molding process optimization and analysis unit is used to import the output molding process model files into the molding process analysis software to carry out molding process optimization analysis. The molding process performance requirement evaluation unit is used to evaluate the molding process analysis results based on the product molding process performance requirements.

11. A computer device, characterized in that, The computer device includes a memory and a processor. The memory stores a computer program, which, when executed by the processor, causes the processor to perform the steps of the joint simulation method for precise design of automotive interior and exterior trim as described in any one of claims 1-9.

12. A computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform the steps of the co-simulation method for precise design of automotive interior and exterior trim as described in any one of claims 1-9.

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