Passenger vehicle trailer cross beam pre-hanging process strength performance design and optimization method and device

Abstract

The invention relates to the technical field of trailer cross beam pre-hanging process strength analysis, in particular to a passenger car trailer cross beam pre-hanging process strength performance design and optimization method and device, and the method comprises the steps: carrying out the grid division of a trailer cross beam according to the assembly data of the trailer cross beam; establishing a finite element model and assembling the trailer beam and the body-in-white model according to an actual process installation mode of the trailer beam; performing grid quality inspection on all divided grids, and outputting an inspection result at the same time; carrying out attribute endowing and material nonlinear characteristic endowing on all parts; setting a boundary condition, a load, a load step and a contact relation of model calculation; pre-hanging bolt impact strength analysis, rear enclosure plate strength analysis and trailer cross beam pre-hanging stability analysis are completed; and carrying out structure optimization on the parts which do not meet the performance requirements. The development period of the trailer beam and the rear enclosure plate can be effectively shortened, and the quality problem of the trailer beam and the rear enclosure plate in the process pre-hanging stage is avoided.

Description

Technical Field

[0001] This application relates to the technical field of strength analysis of trailer crossbeam pre-coupling process, and in particular to a method and apparatus for designing and optimizing the strength performance of passenger car trailer crossbeam pre-coupling process. Background Technology

[0002] During the installation of the crossbeams for overseas-style RV trailers, they need to be pre-attached using bolts from the body-in-white. Because the entire crossbeam has a certain weight, a certain impact force is generated at the moment of pre-attachment. Simultaneously, slippage may occur between the bolts and the pre-attachment points on the crossbeams, causing them to fail to hold. The strength of the pre-attached crossbeams (i.e., the impact strength the bolts can withstand), the strength of the rear panel (i.e., the plastic strain at the bolt positions on the rear panel), and the stability of the pre-attached crossbeams (i.e., whether the bolts can hold the crossbeams) are issues that designers must pay close attention to.

[0003] Currently, it is difficult to conduct strength analysis of the pre-attachment process of trailer crossbeams during the vehicle design phase. When workers directly pre-attach the trailer crossbeams to the bolts during the installation phase, it may lead to bolts being unable to withstand the impact force of the trailer crossbeams, resulting in bolt breakage; the bolt positions of the rear guard plate may experience large plastic strain and be damaged; and unreasonable bolt design may cause slippage and failure to pre-attach, which greatly affects product quality and urgently needs to be resolved. Summary of the Invention

[0004] This application provides a method and apparatus for designing and optimizing the strength performance of the pre-attached crossbeam of a passenger vehicle trailer, in order to solve the problems in the prior art during the process installation stage, such as bolt breakage due to large impact force when the trailer crossbeam is pre-attached to the bolt, large plastic strain due to insufficient strength of the rear guard plate and trailer crossbeam, and slippage and failure to pre-attach due to unreasonable bolt design.

[0005] The first aspect of this application provides a device for designing and optimizing the strength performance of a pre-attached trailer crossbeam in a passenger car, comprising the following steps: acquiring trailer crossbeam assembly data of a target vehicle, and dividing the trailer crossbeam into multiple meshes based on the trailer crossbeam assembly data to establish a finite element model of the trailer crossbeam assembly; performing a truncation operation on a pre-constructed body-in-white finite element model to obtain a partial body-in-white finite element model, and assembling the trailer crossbeam assembly finite element model onto the partial body-in-white finite element model based on a preset actual trailer crossbeam process installation strategy to form an assembly model; performing quality checks on all meshes in the assembly model to obtain corresponding inspection results, and acquiring material information corresponding to each component in the assembly model, so as to base the design on the material information and the inspection results. As a result, each component is assigned material properties and nonlinear material characteristics; boundary conditions and loads are set for the assembly model, and performance calculations are performed on the assembly model after setting boundary conditions and loads to generate energy history curves and performance analysis results. Based on the energy history curves and performance analysis results, simulation calculations are performed on the pre-mounted bolt impact strength, rear guard plate strength, and trailer crossbeam pre-mounted stability to obtain corresponding simulation calculation results. Based on the simulation calculation results, it is determined whether the pre-mounted bolt impact strength, rear guard plate strength, and trailer crossbeam pre-mounted stability meet the corresponding performance requirements to obtain corresponding judgment results. Based on the judgment results, the pre-mounted bolt impact strength, rear guard plate strength, and trailer crossbeam pre-mounted stability are optimized.

[0006] Based on the above-mentioned technical means, the embodiments of this application can help the forward development of trailer crossbeams and rear guard plates, improve the development efficiency of trailer crossbeam and rear guard plate design, effectively shorten the development cycle of trailer crossbeams and rear guard plates, and effectively avoid quality problems of trailer crossbeams and rear guard plates in the pre-installation stage of the process.

[0007] Optionally, in one embodiment of this application, the step of obtaining the trailer crossbeam assembly data of the target vehicle and dividing the trailer crossbeam into multiple meshes based on the trailer crossbeam assembly data to establish a finite element model of the trailer crossbeam assembly includes: dividing the trailer crossbeam into second-order tetrahedral meshes according to the trailer crossbeam assembly data provided by the design, determining the parts of the trailer crossbeam to be refined, and performing mesh refinement operations on the parts to be refined to establish a finite element model of the trailer crossbeam assembly.

[0008] Based on the above-mentioned technical means, the embodiments of this application process the trailer crossbeam assembly according to the design data, thereby avoiding geometric model penetration, ensuring correct structural assembly, and providing an accurate mesh model for subsequent structural analysis by reasonably dividing the mesh, thus improving the reliability of the analysis results.

[0009] Optionally, in one embodiment of this application, the step of performing a truncation operation on the pre-constructed body-in-white finite element model to obtain a partial body-in-white finite element model, and assembling the trailer crossbeam assembly finite element model onto the partial body-in-white finite element model based on a preset actual process installation strategy for the trailer crossbeam to form an assembly model, includes: truncating the latter half of the body-in-white finite element model to obtain the partial body-in-white finite element model, and assembling the trailer crossbeam assembly finite element model onto the partial body-in-white finite element model according to the actual process installation strategy for the trailer crossbeam, such that the bottom of the pre-mounted hole of the trailer crossbeam coincides with the bottom of the bolt, to construct the assembly model.

[0010] Based on the above technical means, the embodiments of this application can effectively balance simulation calculation time and nonlinear calculation convergence by extracting a partial finite element model of the body-in-white and assembling the trailer crossbeam assembly model onto the vehicle body according to the pre-installation method.

[0011] Optionally, in one embodiment of this application, the step of performing quality checks on all meshes in the assembly model to obtain corresponding check results includes: performing quality checks on the Jacobian, minimum size, minimum interior angle of the quadrilateral, minimum interior angle of the triangle, and proportion of the triangle element corresponding to the shell element quadrilateral mesh in the assembly model to obtain shell element quadrilateral mesh check results; performing quality checks on the minimum size and warpage corresponding to the second-order tetrahedral element in the assembly model to obtain second-order tetrahedral element check results; and determining whether all meshes meet preset quality requirements based on the shell element quadrilateral mesh check results and the second-order tetrahedral element check results, wherein, when there are meshes that do not meet the quality requirements, corresponding adjustment operations are performed on the meshes.

[0012] Based on the above technical means, the embodiments of this application correct unqualified meshes by mesh quality inspection (preventing penetration and clarifying element parameters), match material parameters according to BOM and assign measured nonlinear characteristic curves, thereby ensuring the accuracy of mesh and material data, providing a reliable basis for subsequent calculations, and improving the authenticity and accuracy of the results.

[0013] Optionally, in one embodiment of this application, the step of setting boundary conditions and loads for the assembly model, and performing performance calculations on the assembly model after setting boundary conditions and loads to generate energy history curves and performance analysis results, and performing simulation calculations on the impact strength of the pre-mounted bolts, the strength of the rear guard plate, and the pre-mounted stability of the trailer crossbeam based on the energy history curves and the performance analysis results to obtain corresponding simulation calculation results, includes: determining the target position within the target range of the trailer crossbeam assembly that meets the preset contact requirements, establishing contact pairs and corresponding friction coefficients at the target positions, setting surface-to-surface contact pairs between the pre-mounted bolts and the pre-mounted holes of the trailer crossbeam, and establishing General_CONTACT contact connections at other positions, to set boundary conditions and loads for the assembly model; and performing performance calculations on the assembly model after setting boundary conditions and loads. The assembly model is used to perform performance calculations to generate the energy history curve and performance analysis results. Based on the energy history curve and performance analysis results, simulation calculations are performed on the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam to obtain the impact force borne by the bolts on the trailer crossbeam. The ratio of the impact force to the preset nominal cross-sectional area of ​​the bolt is calculated, and it is determined whether the ratio is less than the preset yield strength to obtain the simulation calculation result corresponding to the impact strength of the pre-attached bolts. The plastic strain of the rear guard plate in the pre-attached bolt location area is determined, and it is determined whether the plastic strain is less than the preset threshold to obtain the simulation calculation result corresponding to the strength of the rear guard plate. It is determined whether the distance of slippage of the trailer crossbeam on the pre-attached bolt after the impact is less than the bolt length to obtain the simulation calculation result corresponding to the pre-attached stability of the trailer crossbeam.

[0014] Based on the above technical means, this application embodiment sets and loads boundary conditions and outputs the completed energy history curve to complete the simulation calculation of the pre-attached bolt impact strength, rear guard plate strength, and trailer crossbeam pre-attached stability, thereby greatly ensuring the accuracy and reliability of the pre-attached analysis.

[0015] Optionally, in one embodiment of this application, the step of determining whether the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam meet the corresponding performance requirements based on the simulation calculation results, to obtain the corresponding judgment results, and optimizing the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam according to the judgment results includes: determining whether the simulation analysis results meet the corresponding performance requirements; when the impact strength of the pre-attached bolts does not meet the corresponding performance requirements, changing the bolt diameter specification; when the strength of the rear guard plate does not meet the corresponding performance requirements, locally strengthening the target positions and areas that meet the preset stress requirements according to the preset strain cloud diagram; when the pre-attached stability of the trailer crossbeam does not meet the corresponding performance requirements, optimizing the positions of the left and right pre-attached bolts.

[0016] Based on the aforementioned technical means, the embodiments of this application can accurately simulate the trailer crossbeam assembly, trailer crossbeam modeling, the connection relationship between the trailer crossbeam and the body-in-white, and the assembly relationship. It can perform preliminary simulation verification of the pre-attachment process strength of the trailer crossbeam during the vehicle development stage, accurately simulate the impact strength of the pre-attachment bolts, the strength of the rear guard plate, and the pre-attachment stability, and optimize structures that do not meet the performance requirements. This can effectively improve the forward development capability of the trailer crossbeam and the rear guard plate, avoid redevelopment due to unmet performance requirements during process installation, shorten the development cycle, and accelerate product development efficiency.

[0017] A second aspect of this application provides a device for designing and optimizing the strength performance of a pre-attached trailer crossbeam in a passenger vehicle, comprising: a modeling module for acquiring trailer crossbeam assembly data of a target vehicle and dividing the trailer crossbeam into multiple meshes based on the trailer crossbeam assembly data to establish a finite element model of the trailer crossbeam assembly; an assembly module for performing a truncation operation on a pre-constructed body-in-white finite element model to obtain a partial body-in-white finite element model, and assembling the trailer crossbeam assembly finite element model onto the partial body-in-white finite element model based on a preset actual trailer crossbeam process installation strategy to form an assembly model; and a quality inspection module for performing quality inspection on all meshes in the assembly model to obtain corresponding inspection results, and acquiring material information corresponding to each component in the assembly model, so as to base the quality inspection on the material information and the inspection results. As a result, each component is assigned material properties and nonlinear material characteristics; the simulation calculation module is used to set boundary conditions and loads for the assembly model, and to perform performance calculations on the assembly model after setting boundary conditions and loads to generate energy history curves and performance analysis results. Based on the energy history curves and performance analysis results, simulation calculations are performed on the pre-attached bolt impact strength, rear guard plate strength, and trailer crossbeam pre-attached stability to obtain corresponding simulation calculation results; the optimization module is used to determine whether the pre-attached bolt impact strength, rear guard plate strength, and trailer crossbeam pre-attached stability meet the corresponding performance requirements based on the simulation calculation results to obtain corresponding judgment results, and to optimize the pre-attached bolt impact strength, rear guard plate strength, and trailer crossbeam pre-attached stability based on the judgment results.

[0018] Optionally, in one embodiment of this application, the modeling module includes: a partitioning unit, used to partition the trailer crossbeam into a second-order tetrahedral mesh according to the trailer crossbeam assembly data provided in the design, and to determine the part to be refined corresponding to the trailer crossbeam, and to perform mesh refinement operation on the part to be refined, so as to establish a finite element model of the trailer crossbeam assembly.

[0019] Optionally, in one embodiment of this application, the assembly module includes: a cutting unit, used to cut off the latter half of the body-in-white finite element model to obtain the partial body-in-white finite element model, and to assemble the trailer crossbeam assembly finite element model onto the partial body-in-white finite element model according to the actual process installation strategy of the trailer crossbeam, so that the bottom of the pre-hanging hole of the trailer crossbeam coincides with the bottom of the bolt, so as to construct the assembly model.

[0020] Optionally, in one embodiment of this application, the quality inspection module includes: an analysis unit, used to perform quality inspections on the Jacobian, minimum size, minimum interior angle of the quadrilateral, minimum interior angle of the triangle, and proportion of the triangle element corresponding to the shell element quadrilateral mesh in the assembly model, to obtain the shell element quadrilateral mesh inspection result; and a first judgment unit, used to perform quality inspections on the minimum size and warpage corresponding to the second-order tetrahedral element in the assembly model, to obtain the second-order tetrahedral element inspection result, and to determine whether all meshes meet the preset quality requirements based on the shell element quadrilateral mesh inspection result and the second-order tetrahedral element inspection result, wherein, when there are meshes that do not meet the quality requirements, corresponding adjustment operations are performed on the meshes.

[0021] Optionally, in one embodiment of this application, the simulation calculation module includes: a setup unit, used to determine the target positions within the target range of the trailer crossbeam assembly that meet the preset contact requirements, and to establish contact pairs and corresponding friction coefficients at the target positions, and to set surface-to-surface contact pairs between the pre-mounted bolts and the pre-mounted holes of the trailer crossbeam, and to establish General_CONTACT contact connections at other positions, so as to set boundary conditions and loads for the assembly model; a second judgment unit, used to perform performance calculations on the assembly model after setting boundary conditions and loads, so as to generate the energy history curve and the performance analysis results, and to determine the impact strength of the pre-mounted bolts according to the energy history curve and the performance analysis results. The simulation calculations are performed on the strength of the rear guard plate and the pre-attached stability of the trailer crossbeam to obtain the impact force borne by the bolts on the trailer crossbeam. The ratio of the impact force to the preset nominal cross-sectional area of ​​the bolt is calculated, and it is determined whether the ratio is less than the preset yield strength to obtain the simulation calculation result corresponding to the impact strength of the pre-attached bolt. The third judgment unit is used to determine the plastic strain of the rear guard plate in the pre-attached bolt location area and to determine whether the plastic strain is less than the preset threshold to obtain the simulation calculation result corresponding to the strength of the rear guard plate. The fourth judgment unit is used to determine whether the distance of slippage of the trailer crossbeam on the pre-attached bolt after the impact is less than the bolt length to obtain the simulation calculation result corresponding to the pre-attached stability of the trailer crossbeam.

[0022] Optionally, in one embodiment of this application, the optimization module includes: a fifth judgment unit, used to judge whether the simulation analysis result meets the corresponding performance requirements; a replacement unit, used to replace the bolt diameter specification when the impact strength of the pre-attached bolt does not meet the corresponding performance requirements; a reinforcement unit, used to locally reinforce the target position and area that meets the preset stress requirements according to the preset strain cloud diagram when the strength of the rear guard plate does not meet the corresponding performance requirements; and a processing unit, used to optimize the position of the left and right pre-attached bolts when the pre-attached stability of the trailer crossbeam does not meet the corresponding performance requirements.

[0023] A third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the program to implement the passenger car trailer crossbeam pre-coupling process strength performance design and optimization method as described in the above embodiments.

[0024] A fourth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for designing and optimizing the strength performance of a passenger vehicle trailer crossbeam pre-mounting process.

[0025] A fifth aspect of this application provides a computer program product, including a computer program that is executed to implement the above-described method for designing and optimizing the strength performance of pre-attached crossbeams for passenger vehicle trailers.

[0026] Therefore, the embodiments of this application have the following beneficial effects: The embodiments of this application can obtain the trailer crossbeam assembly data of the target vehicle, and based on the trailer crossbeam assembly data, divide the trailer crossbeam into multiple meshes to establish a finite element model of the trailer crossbeam assembly; perform a truncation operation on the pre-constructed body-in-white finite element model to obtain a local body-in-white finite element model, and assemble the trailer crossbeam assembly finite element model onto the local body-in-white finite element model based on a preset actual process installation strategy for the trailer crossbeam to form an assembly model; perform quality checks on all meshes in the assembly model to obtain the corresponding inspection results, and obtain the material information corresponding to each component in the assembly model, so as to assign a material to each component based on the material information and inspection results. The application investigates the nonlinear characteristics of properties and materials; it sets boundary conditions and loads for the assembly model, and performs performance calculations on the assembled model after setting boundary conditions and loads to generate energy history curves and performance analysis results. Based on the energy history curves and performance analysis results, it simulates the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam to obtain corresponding simulation results. Based on the simulation results, it determines whether the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam meet the corresponding performance requirements, obtains the corresponding judgment results, and optimizes the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam based on the judgment results. This application can facilitate the forward development of trailer crossbeams and rear guard plates, improve the development efficiency of trailer crossbeam and rear guard plate design, effectively shorten the development cycle of trailer crossbeams and rear guard plates, and effectively avoid quality problems of trailer crossbeams and rear guard plates in the pre-attachment stage of the process. This solves the problems in existing technologies during the process installation stage, such as bolt breakage due to large impact force when the trailer crossbeam is pre-attached to the bolts, large plastic strain due to insufficient strength of the rear guard plate and trailer crossbeam, and slippage and failure to pre-attach due to unreasonable bolt design.

[0027] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart illustrating the design and optimization method for the strength performance of a passenger car trailer crossbeam pre-coupling process according to an embodiment of this application; Figure 2 This is a schematic diagram of a trailer crossbeam provided in an embodiment of this application; Figure 3 This application provides a schematic diagram of the assembly of a body-in-white and a trailer crossbeam in an embodiment. Figure 4This application provides a schematic diagram of the initial pre-attachment position of a bolt and a trailer crossbeam pre-attachment hole, as shown in the embodiment of the present application. Figure 5 A schematic diagram of mass scaling and kinetic energy history output curves provided in an embodiment of this application; Figure 6 A schematic diagram of the execution logic of a method for designing and optimizing the strength performance of a pre-attached crossbeam for a passenger vehicle trailer, provided in an embodiment of this application; Figure 7 A schematic diagram of the logical architecture of a passenger car trailer crossbeam pre-attachment process strength performance design and optimization system provided in this application embodiment; Figure 8 This is an example diagram of a device for designing and optimizing the strength performance of a passenger car trailer crossbeam pre-coupling process according to an embodiment of this application; Figure 9 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0029] Among them, 10-Passenger vehicle trailer crossbeam pre-hanging process strength performance design and optimization device; 100-Modeling module, 200-Assembly module, 300-Quality inspection module, 400-Simulation calculation module, 500-Optimization module; 901-Memory, 902-Processor, 903-Communication interface. Detailed Implementation

[0030] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0031] The following describes, with reference to the accompanying drawings, a method and apparatus for designing and optimizing the strength performance of a passenger car trailer crossbeam pre-mounting process according to embodiments of this application. Addressing the problems mentioned in the background art, this application provides a method for designing and optimizing the strength performance of a passenger car trailer crossbeam pre-mounting process. In this method, the trailer crossbeam assembly data of the target vehicle is obtained, and based on this data, the trailer crossbeam is divided into multiple meshes to establish a finite element model of the trailer crossbeam assembly. A pre-constructed body-in-white finite element model is truncated to obtain a partial body-in-white finite element model. Based on a preset actual trailer crossbeam process installation strategy, the trailer crossbeam assembly finite element model is assembled onto the partial body-in-white finite element model to form an assembly model. All meshes in the assembly model are subjected to quality checks to obtain corresponding check results, and the material information corresponding to each component in the assembly model is obtained. Based on material information and inspection results, each component is assigned material properties and nonlinear characteristics. Boundary conditions and loads are set for the assembly model, and performance calculations are performed on the assembly model after setting boundary conditions and loads to generate energy history curves and performance analysis results. Simulation calculations are then performed on the pre-attached bolt impact strength, rear bulkhead strength, and trailer crossbeam pre-attachment stability based on the energy history curves and performance analysis results to obtain corresponding simulation results. Based on the simulation results, it is determined whether the pre-attached bolt impact strength, rear bulkhead strength, and trailer crossbeam pre-attachment stability meet the corresponding performance requirements to obtain corresponding judgment results. Based on the judgment results, the pre-attached bolt impact strength, rear bulkhead strength, and trailer crossbeam pre-attachment stability are optimized. This application can facilitate the forward development of trailer crossbeams and rear bulkheads, improve the development efficiency of trailer crossbeam and rear bulkhead design, effectively shorten the development cycle of trailer crossbeams and rear bulkheads, and effectively avoid quality problems in the pre-attachment stage of the trailer crossbeam and rear bulkhead. This solves the problems in existing technologies during the process installation stage, such as bolt breakage due to large impact force when the trailer crossbeam is pre-attached to the bolts, large plastic strain due to insufficient strength of the rear guard plate and trailer crossbeam, and slippage and failure to pre-attach due to unreasonable bolt design.

[0032] Specifically, Figure 1 This is a flowchart illustrating the design and optimization method for the strength performance of a passenger vehicle trailer crossbeam pre-attachment process, as provided in an embodiment of this application.

[0033] like Figure 1 As shown, the design and optimization method for the strength performance of the pre-coupling process of the passenger car trailer crossbeam includes the following steps: In step S101, the trailer crossbeam assembly data of the target vehicle is obtained, and based on the trailer crossbeam assembly data, the trailer crossbeam is divided into multiple meshes to establish a finite element model of the trailer crossbeam assembly.

[0034] Those skilled in the art should understand that with the popularity of lightweight technology in passenger vehicles, while reducing quality and costs, it is also necessary to meet various strength and stiffness performance requirements of the vehicle. This poses a severe challenge to the development of vehicle assembly performance. Therefore, it is extremely important to conduct accurate performance evaluation of the vehicle during the project development phase. The embodiments of this application can perform preliminary simulation verification of the pre-attachment strength of the trailer crossbeam during the vehicle development phase, ensuring that the performance meets the requirements during the development phase. This avoids situations during the process installation phase where the trailer crossbeam is pre-attached to the bolts due to large impact forces, resulting in bolt breakage, insufficient strength of the rear guard plate and trailer crossbeam leading to large plastic strain, or unreasonable bolt design causing slippage and failure to pre-attach, effectively preventing product quality problems.

[0035] Currently, the strength performance of trailer crossbeam pre-attachment is still largely determined by installation workers' experience. This application's embodiment allows for detailed modeling of the vehicle and trailer crossbeams, and virtual verification of the pre-attachment strength performance using finite element simulation technology. This makes the strength assessment more accurate and better reflects the actual installation process, effectively improving the forward development capabilities of trailer crossbeams and rear panel guards, reducing product development costs, shortening product development cycles, and significantly increasing the development efficiency of trailer crossbeams and rear panel guards.

[0036] Specifically, in this embodiment of the application, the assembly data of the trailer crossbeam can first be obtained, and then... Figure 2 The trailer crossbeam shown is meshed, and a finite element model of the trailer crossbeam assembly is then established, thus providing reliable guidance and basis for the subsequent strength performance analysis of the trailer crossbeam pre-attachment process.

[0037] Optionally, in one embodiment of this application, the trailer crossbeam assembly data of the target vehicle is obtained, and based on the trailer crossbeam assembly data, the trailer crossbeam is divided into multiple meshes to establish a finite element model of the trailer crossbeam assembly. This includes: dividing the trailer crossbeam into second-order tetrahedral meshes according to the trailer crossbeam assembly data provided by the design, determining the parts of the trailer crossbeam to be refined, and performing mesh refinement operations on the parts to be refined to establish a finite element model of the trailer crossbeam assembly.

[0038] It should be noted that, according to the trailer crossbeam assembly data provided in this application, the geometric models in the data are ensured to be free of penetration issues and the structure is correctly assembled. The trailer crossbeam is divided into a second-order tetrahedral mesh with a basic mesh size of 5mm, and a 2mm mesh is used to refine the local feature parts.

[0039] Therefore, the embodiments of this application process the trailer crossbeam assembly based on design data, thereby avoiding geometric model penetration, ensuring correct structural assembly, and providing an accurate mesh model for subsequent structural analysis by reasonably dividing the mesh, thus improving the reliability of the analysis results.

[0040] In step S102, the pre-constructed body-in-white finite element model is truncated to obtain a partial body-in-white finite element model. Based on the preset actual process installation strategy of the trailer crossbeam, the trailer crossbeam assembly finite element model is assembled onto the partial body-in-white finite element model to form an assembly model.

[0041] Furthermore, in embodiments of this application, the rear half of the body-in-white model can be directly cut to obtain a partial body-in-white finite element model. The bottom of the pre-mounted bolts on the body is then aligned with the bottom of the pre-mounted holes on the trailer crossbeam according to the pre-mounting process, thus forming an assembly model. Figure 3 As shown, this results in the maximum impact distance when displaying dynamic analysis.

[0042] Optionally, in one embodiment of this application, a pre-constructed body-in-white finite element model is truncated to obtain a partial body-in-white finite element model. Based on a preset actual process installation strategy for the trailer crossbeam, the trailer crossbeam assembly finite element model is assembled onto the partial body-in-white finite element model to form an assembly model. This includes: truncating the latter half of the body-in-white finite element model to obtain a partial body-in-white finite element model, and assembling the trailer crossbeam assembly finite element model onto the partial body-in-white finite element model according to the actual process installation strategy for the trailer crossbeam, such that the bottom of the pre-mounted hole of the trailer crossbeam coincides with the bottom of the bolt, thereby constructing the assembly model.

[0043] In the data design phase, a finite element model of the body-in-white is usually already available for the trailer crossbeam. In this embodiment, the rear half of the body-in-white model can be directly extracted, and the bottom of the pre-mounted holes in the trailer crossbeam is aligned with the bottom of the bolts. Figure 4 As shown, therefore, a maximum impact distance Dd is generated during the dynamic analysis, where D is the diameter of the pre-attached hole in the trailer crossbeam and d is the diameter of the pre-attached bolt on the white body.

[0044] Therefore, the embodiments of this application can effectively balance simulation calculation time and nonlinear calculation convergence by extracting a partial finite element model of the body-in-white and assembling the trailer crossbeam assembly model onto the vehicle body according to the pre-installation method.

[0045] In step S103, a quality check is performed on all meshes in the assembly model to obtain the corresponding check results, and the material information corresponding to each component in the assembly model is obtained. Based on the material information and the check results, material properties and material nonlinear characteristics are assigned to each component.

[0046] Furthermore, embodiments of this application can perform mesh quality checks on all divided meshes, output the check results, and assign attributes and material nonlinear characteristics to all components, thereby ensuring the accuracy of subsequent simulation calculation results.

[0047] Optionally, in one embodiment of this application, a quality check is performed on all meshes in the assembly model to obtain corresponding check results. This includes: performing quality checks on the Jacobian, minimum size, minimum interior angle of the quadrilateral, minimum interior angle of the triangle, and proportion of the triangle element corresponding to the shell element quadrilateral mesh in the assembly model to obtain shell element quadrilateral mesh check results; performing quality checks on the minimum size and warpage corresponding to the second-order tetrahedral element in the assembly model to obtain second-order tetrahedral element check results; and determining whether all meshes meet the preset quality requirements based on the shell element quadrilateral mesh check results and the second-order tetrahedral element check results. In the case of meshes that do not meet the quality requirements, corresponding adjustment operations are performed on the meshes.

[0048] In the specific implementation process, after all the meshes are divided, the embodiments of this application need to perform mesh quality checks, and no penetration between components is allowed; for shell element quadrilateral meshes, the Jacobian is ≥0.6, the minimum size is >2mm, the minimum interior angle of the quadrilateral is >45°, the minimum interior angle of the triangle is >20°, and the proportion of triangular elements is ≤3%; for second-order tetrahedral elements, the minimum size is >2mm, the warpage is <18, negative angle meshes are not allowed, and unqualified meshes need to be modified.

[0049] Secondly, in this application embodiment, the parameter characteristics of each corresponding material can be completed according to the material grade standard on the BOM. At the same time, in order to ensure the accuracy of the calculation results, nonlinear characteristic curves of the materials of each component of the vehicle body and trailer crossbeam are obtained from experimental measurements.

[0050] Therefore, the embodiments of this application correct unqualified meshes by checking mesh quality (preventing penetration and clarifying element parameters), matching material parameters according to BOM and assigning measured nonlinear characteristic curves, thereby ensuring the accuracy of mesh and material data, providing a reliable basis for subsequent calculations, and improving the authenticity and accuracy of the results.

[0051] In step S104, boundary conditions and loads are set for the assembly model, and performance calculations are performed on the assembly model after setting boundary conditions and loads to generate energy history curves and performance analysis results. Based on the energy history curves and performance analysis results, simulation calculations are performed on the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam to obtain the corresponding simulation calculation results.

[0052] Subsequently, embodiments of this application can set boundary conditions, loads, load steps, and contact relationships for model calculations, and perform pre-attached bolt impact strength analysis, rear guard plate strength analysis, and trailer crossbeam pre-attached stability analysis.

[0053] Therefore, the embodiments of this application can better reflect the installation process of the trailer crossbeam, making the process strength assessment more accurate and realistic. It only examines the strength of the bolts and the rear guard plate, and also includes whether the bolts can be held in place during the pre-hanging process. This can prevent quality problems from occurring in the design stage, provide guidance for vehicle design and optimization, and greatly help improve product quality.

[0054] Optionally, in one embodiment of this application, boundary conditions and loads are set for the assembly model, and performance calculations are performed on the assembly model after setting boundary conditions and loads to generate energy history curves and performance analysis results. Based on the energy history curves and performance analysis results, simulation calculations are performed on the impact strength of the pre-mounted bolts, the strength of the rear guard plate, and the pre-mounting stability of the trailer crossbeam to obtain corresponding simulation calculation results. This includes: determining the target positions within the target range of the trailer crossbeam assembly that meet the preset contact requirements, establishing contact pairs and corresponding friction coefficients at the target positions, setting surface-to-surface contact pairs between the pre-mounted bolts and the pre-mounted holes of the trailer crossbeam, and establishing General_CONTACT contact connections at other positions to set boundary conditions and loads for the assembly model; setting boundary conditions and loads... The assembled model is then subjected to performance calculations to generate energy history curves and performance analysis results. Based on these results, simulations are performed on the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam. This yields the impact force borne by the bolts from the trailer crossbeam, and the ratio of the impact force to the preset nominal cross-sectional area of ​​the bolt is calculated. The ratio is then checked against a preset yield strength to obtain the simulation results corresponding to the impact strength of the pre-attached bolts. The plastic strain of the rear guard plate in the pre-attached bolt location area is determined, and its value is checked against a preset threshold to obtain the simulation results corresponding to the strength of the rear guard plate. Finally, the distance of slippage of the trailer crossbeam on the pre-attached bolts after impact is determined to be less than the bolt length, yielding the simulation results corresponding to the pre-attached stability of the trailer crossbeam.

[0055] Specifically, in the embodiments of this application, the trailer crossbeam assembly can be assembled on the vehicle body according to the pre-attachment process and then subjected to finite element simulation analysis. The main considerations are the weight of the trailer crossbeam itself, the impact force generated at the moment of pre-attachment, and the influence of slippage between the trailer crossbeam and the pre-attachment bolts after pre-attachment. At the same time, the actual pre-attachment process is simulated by contact settings, thereby improving the accuracy of the simulation analysis results.

[0056] After completing the assembly model, contact pairs are established at potential contact locations near the trailer crossbeam assembly, with a friction coefficient set to 0.2. Surface-to-surface contact pairs are established between the pre-mounted bolts and the pre-mounted holes of the trailer crossbeam. General_CONTACT contact connections are established at other locations. All degrees of freedom of the section of the cut-off body-in-white are constrained, and a speed of 9.8 m / s² is applied. 2The acceleration due to gravity.

[0057] Secondly, after the strength performance analysis of the pre-attached trailer beam process is completed, the energy history curve of the simulation analysis results is output, and the changes of the specified variables throughout the entire calculation and analysis process are output to determine whether the simulation analysis model is reliable.

[0058] Upon completion of the strength performance analysis of the trailer crossbeam pre-attachment process, this embodiment of the application can output the energy history curve of the simulation calculation results, showing the changes of specified variables throughout the entire calculation and analysis process. Viewing and analyzing the model's energy history plays a crucial role in determining the accuracy of the analysis results. The energy balance equation is: ETOTAL=ALLKE+ALLIE+ALLFD+ALLIHE-ALLWK-ALLPW-ALLCW-ALLMW-ALLHF Where ETOTAL is the total energy; ALLKE is the kinetic energy; ALLIE is the strain energy; ALLFD is the energy dissipation caused by friction; ALLIHE is the energy inside the model; ALLWK is the work done by external forces; ALLPW is the work done by contact-penalty; ALLCW is the work done by constraint-penalty; ALLMW is the energy generated by mass scaling; and ALLHF is the heat energy transferred from the outside.

[0059] Figure 5 A schematic diagram of the output curves for mass scaling and kinetic energy history, such as... Figure 5 As shown, the mass scaling is very small compared to the other two, and is negligible in the actual energy of the system, so the strength performance analysis model of the trailer crossbeam pre-attachment process is reliable.

[0060] Furthermore, in performance analysis, embodiments of this application can place all 3D and 2D units in the same set. Units within the set establish universal contact to ensure correct contact relationships between components under stress and prevent interference. Bolt impact strength calculation, rear bulkhead plastic deformation calculation, and trailer crossbeam pre-attachment stability calculation are performed sequentially. Performance requirements must be met simultaneously for all three conditions to be considered satisfactory.

[0061] During the finite element method (FEM) calculation, the trailer crossbeam has a certain weight and an impact distance, thus generating an impact force on the pre-attached bolts. For the bolt strength calculation, simulation analysis yields the impact force F exerted by the crossbeam on the bolts, where F / A < 0.05. Where A is the cross-sectional area of ​​the bolt. The yield strength is used; for the calculation of plastic deformation of the rear guard plate, it is necessary to check the plastic strain of the rear guard plate in the bolt location area, which should be less than 0.2%; for the calculation of pre-attached stability of the trailer crossbeam, the main focus is on the distance l of slippage of the trailer crossbeam on the bolts after the impact. hIs it less than the length L of the screw? Excessive slippage will cause the bolt to fail to hold properly.

[0062] Therefore, this embodiment of the application sets boundary conditions and outputs the completed energy history curve to complete the simulation calculation of the pre-attached bolt impact strength, rear guard plate strength, and trailer crossbeam pre-attached stability, thereby greatly ensuring the accuracy and reliability of the pre-attached analysis.

[0063] In step S105, based on the simulation calculation results, it is determined whether the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam meet the corresponding performance requirements, so as to obtain the corresponding judgment results, and optimize the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam according to the judgment results.

[0064] Finally, the embodiments of this application can evaluate whether each working condition meets the performance requirements. If the performance requirements are not met, structural optimization is performed. Thus, the embodiments of this application can realize the forward development capability of trailer crossbeams and rear body panels, shorten the product development cycle, save development costs, and identify process quality problems caused by pre-attaching of trailer crossbeams during the product development stage, thereby avoiding quality risks. Optionally, in one embodiment of this application, based on simulation calculation results, it is determined whether the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam meet the corresponding performance requirements, so as to obtain the corresponding judgment results, and optimize the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam according to the judgment results, including: determining whether the simulation analysis results meet the corresponding performance requirements; when the impact strength of the pre-attached bolts does not meet the corresponding performance requirements, changing the bolt diameter specification; when the strength of the rear guard plate does not meet the corresponding performance requirements, locally strengthening the target positions and areas that meet the preset stress requirements according to the preset strain cloud diagram; when the pre-attached stability of the trailer crossbeam does not meet the corresponding performance requirements, optimizing the positions of the left and right pre-attached bolts.

[0065] In the specific implementation process, the embodiments of this application can evaluate whether each working condition meets the performance requirements. If the performance requirements are not met, structural optimization is performed. In the embodiments of this application, the evaluation standard for the strength analysis of the trailer crossbeam pre-attachment process is: bolt strength < The plastic strain of the rear guard plate is <0.2%, and the distance l from which the trailer crossbeam slips on the bolts is... h <L.

[0066] As one possible approach, such as Figure 6As shown, in this embodiment, if the bolt impact strength does not meet the performance requirements, the bolt diameter can be changed; if the plastic deformation of the rear cladding does not meet the performance requirements, local reinforcement can be applied to the high-stress areas and surrounding regions based on the strain cloud diagram; if the pre-attachment stability of the trailer crossbeam does not meet the requirements, i.e., slippage and failure to pre-attach, the positions of the left and right pre-attachment bolts can be optimized. After multiple rounds of optimization, the performance of all three operating conditions is simultaneously met, and the process ends.

[0067] Therefore, the embodiments of this application can accurately simulate the trailer crossbeam assembly, trailer crossbeam modeling, the connection relationship between the trailer crossbeam and the body-in-white, and the assembly relationship. It can perform early simulation verification of the pre-attachment process strength of the trailer crossbeam during the vehicle development stage, accurately simulate the impact strength of the pre-attachment bolts, the strength of the rear guard plate, and the pre-attachment stability, and optimize the structure that does not meet the performance requirements. This can effectively improve the forward development capability of the trailer crossbeam and the rear guard plate, avoid the need for redevelopment due to the failure to meet the performance requirements during process installation, shorten the development cycle, and accelerate product development efficiency.

[0068] Furthermore, this application can also construct a corresponding system for designing and optimizing the strength performance of pre-mounted passenger car trailer crossbeams based on the execution logic of the method for designing and optimizing the strength performance of pre-mounted passenger car trailer crossbeams. For example... Figure 7 As shown, the passenger car trailer crossbeam pre-attachment process strength performance design and optimization system includes a mesh generation module, a model assembly module, a mesh quality inspection module, a material property assignment module, a load boundary condition setting module, a simulation analysis module, and a structural optimization module.

[0069] The mesh generation module is mainly used to divide the trailer crossbeam into meshes based on the obtained assembly data of the trailer crossbeam.

[0070] The model assembly module mainly establishes a finite element model and assembles the trailer crossbeam and body-in-white model according to the actual process installation method of the trailer crossbeam.

[0071] The mesh quality inspection module mainly performs mesh quality inspection on all the divided meshes and outputs the inspection results.

[0072] The material property assignment module is mainly used to assign properties to all components and to assign nonlinear material characteristics.

[0073] The load boundary condition setting module mainly sets the boundary conditions, loads, load steps, and contact relationships for model calculations.

[0074] The simulation analysis module mainly performs impact strength analysis of pre-attached bolts, strength analysis of rear guard plate, and stability analysis of pre-attached trailer beams.

[0075] The structural optimization module is mainly used to optimize the structure of components that do not meet performance requirements.

[0076] According to the passenger car trailer crossbeam pre-attachment process strength performance design and optimization method proposed in this application embodiment, the trailer crossbeam assembly data of the target vehicle is obtained, and based on the trailer crossbeam assembly data, the trailer crossbeam is divided into multiple meshes to establish a trailer crossbeam assembly finite element model; a pre-constructed body-in-white finite element model is truncated to obtain a local body-in-white finite element model, and based on a preset actual trailer crossbeam process installation strategy, the trailer crossbeam assembly finite element model is assembled onto the local body-in-white finite element model to form an assembly model; quality checks are performed on all meshes in the assembly model to obtain the corresponding inspection results, and material information corresponding to each component in the assembly model is obtained, so as to base the material information and inspection results on the quality performance design and optimization method. As a result, material properties and nonlinear characteristics are assigned to each component; boundary conditions and loads are set for the assembly model, and performance calculations are performed on the assembly model after setting boundary conditions and loads to generate energy history curves and performance analysis results. Based on the energy history curves and performance analysis results, simulation calculations are performed on the impact strength of the pre-mounted bolts, the strength of the rear guard plate, and the pre-mounted stability of the trailer crossbeam to obtain corresponding simulation calculation results. Based on the simulation calculation results, it is determined whether the impact strength of the pre-mounted bolts, the strength of the rear guard plate, and the pre-mounted stability of the trailer crossbeam meet the corresponding performance requirements to obtain corresponding judgment results. Based on the judgment results, the impact strength of the pre-mounted bolts, the strength of the rear guard plate, and the pre-mounted stability of the trailer crossbeam are optimized. This application can help the forward development of the trailer crossbeam and the rear guard plate, improve the development efficiency of the trailer crossbeam and rear guard plate design, effectively shorten the development cycle of the trailer crossbeam and the rear guard plate, and effectively avoid quality problems of the trailer crossbeam and the rear guard plate in the pre-mounting stage of the process.

[0077] Secondly, with reference to the accompanying drawings, the strength performance design and optimization device for the pre-attachment process of passenger car trailer crossbeams according to the embodiments of this application is described.

[0078] Figure 8 This is a block diagram of the passenger car trailer crossbeam pre-hanging process strength performance design and optimization device according to an embodiment of this application.

[0079] like Figure 8 As shown, the passenger vehicle trailer crossbeam pre-attachment process strength performance design and optimization device 10 includes: modeling module 100, assembly module 200, quality inspection 300, simulation calculation module 400, and detection module 500.

[0080] Among them, the modeling module 100 is used to acquire the trailer crossbeam assembly data of the target vehicle, and based on the trailer crossbeam assembly data, divide the trailer crossbeam into multiple meshes to establish a finite element model of the trailer crossbeam assembly. Assembly module 200 is used to perform a cut operation on the pre-built body-in-white finite element model to obtain a partial body-in-white finite element model, and based on the preset actual process installation strategy of trailer crossbeam, assemble the trailer crossbeam assembly finite element model onto the partial body-in-white finite element model to form an assembly model. The quality inspection module 300 is used to perform quality inspection on all meshes in the assembly model to obtain the corresponding inspection results, and to obtain the material information corresponding to each component in the assembly model, so as to assign material properties and material nonlinear characteristics to each component based on the material information and inspection results. The simulation calculation module 400 is used to set boundary conditions and loads for the assembly model, and to perform performance calculations on the assembly model after setting boundary conditions and loads to generate energy history curves and performance analysis results. Based on the energy history curves and performance analysis results, simulation calculations are performed on the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam to obtain the corresponding simulation calculation results. The optimization module 500 is used to determine whether the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam meet the corresponding performance requirements based on the simulation calculation results, so as to obtain the corresponding judgment results and optimize the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam according to the judgment results.

[0081] Optionally, in one embodiment of this application, the modeling module 100 includes: a partitioning unit, used to partition the trailer crossbeam into a second-order tetrahedral mesh according to the trailer crossbeam assembly data provided in the design, and to determine the part to be refined corresponding to the trailer crossbeam, and to perform mesh refinement operation on the part to be refined, so as to establish a finite element model of the trailer crossbeam assembly.

[0082] Optionally, in one embodiment of this application, the assembly module 200 includes: a cutting unit, used to cut off the latter half of the body-in-white finite element model to obtain a partial body-in-white finite element model, and to assemble the trailer crossbeam assembly finite element model onto the partial body-in-white finite element model according to the actual process installation strategy of the trailer crossbeam, so that the bottom of the pre-hanging hole of the trailer crossbeam coincides with the bottom of the bolt, so as to construct the assembly model.

[0083] Optionally, in one embodiment of this application, the quality inspection module 300 includes an analysis unit and a first judgment unit.

[0084] The analysis unit is used to perform quality checks on the Jacobian, minimum size, minimum interior angle of the quadrilateral, minimum interior angle of the triangle, and proportion of the triangle element corresponding to the shell element quadrilateral mesh in the assembly model, so as to obtain the shell element quadrilateral mesh check results.

[0085] The first judgment unit is used to perform quality checks on the minimum size and warpage of the second-order tetrahedral elements in the assembly model to obtain the second-order tetrahedral element inspection results. Based on the shell element quadrilateral mesh inspection results and the second-order tetrahedral element inspection results, it determines whether all meshes meet the preset quality requirements. If there are meshes that do not meet the quality requirements, the meshes are adjusted accordingly.

[0086] Optionally, in one embodiment of this application, the simulation calculation module 400 includes: a setup unit, a second judgment unit, a third judgment unit, and a fourth judgment unit.

[0087] The unit is used to determine the target position within the target range of the trailer crossbeam assembly that meets the preset contact requirements, and to establish contact pairs and corresponding friction coefficients at the target positions. It also sets surface-to-surface contact pairs between the pre-mounted bolts and the pre-mounted holes of the trailer crossbeam, and establishes General_CONTACT contact connections at other positions to set boundary conditions and loads for the assembly model.

[0088] The second judgment unit is used to perform performance calculations on the assembly model after setting boundary conditions and loads to generate energy history curves and performance analysis results. Based on the energy history curves and performance analysis results, it performs simulation calculations on the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam to obtain the impact force of the bolts on the trailer crossbeam. It also calculates the ratio of the impact force to the preset nominal cross-sectional area of ​​the bolts and judges whether the ratio is less than the preset yield strength to obtain the simulation calculation results corresponding to the impact strength of the pre-attached bolts.

[0089] The third judgment unit is used to determine the plastic strain of the rear cladding plate in the area where the pre-installed bolts are located, and to determine whether the plastic strain is less than a preset threshold, so as to obtain the simulation calculation results corresponding to the strength of the rear cladding plate.

[0090] The fourth judgment unit is used to determine whether the distance of slippage of the trailer crossbeam on the pre-attached bolt after the impact is less than the bolt length, so as to obtain the simulation calculation results corresponding to the pre-attached stability of the trailer crossbeam.

[0091] Optionally, in one embodiment of this application, the optimization module 500 includes: a fifth judgment unit, a replacement unit, a strengthening unit, and a processing unit.

[0092] The fifth judgment unit is used to determine whether the simulation analysis results meet the corresponding performance requirements.

[0093] The replacement unit is used to replace the bolt diameter when the impact strength of the pre-attached bolt does not meet the corresponding performance requirements.

[0094] The reinforcement unit is used to locally reinforce the target location and area that meets the preset stress requirements based on the preset strain cloud diagram when the strength of the rear cladding does not meet the corresponding performance requirements.

[0095] The processing unit is used to optimize the positions of the left and right pre-attachment bolts when the pre-attachment stability of the trailer crossbeam does not meet the corresponding performance requirements.

[0096] It should be noted that the foregoing explanation of the embodiment of the design and optimization method for the strength performance of the pre-attached crossbeam of a passenger car trailer also applies to the design and optimization device for the strength performance of the pre-attached crossbeam of a passenger car trailer in this embodiment, and will not be repeated here.

[0097] The passenger vehicle trailer crossbeam pre-attachment process strength performance design and optimization device proposed in this application includes a modeling module 100, used to acquire trailer crossbeam assembly data of the target vehicle, and based on the trailer crossbeam assembly data, divide the trailer crossbeam into multiple meshes to establish a finite element model of the trailer crossbeam assembly; an assembly module 200, used to perform a truncation operation on the pre-constructed body-in-white finite element model to obtain a partial body-in-white finite element model, and based on a preset actual trailer crossbeam process installation strategy, assemble the trailer crossbeam assembly finite element model onto the partial body-in-white finite element model to form an assembly model; and a quality inspection module 300, used to perform quality inspection on all meshes in the assembly model to obtain the corresponding inspection results, and acquire the material information corresponding to each component in the assembly model, so as to base the design on the material... The system incorporates information and inspection results, assigning material properties and nonlinear characteristics to each component. A simulation calculation module 400 sets boundary conditions and loads for the assembly model and performs performance calculations to generate energy history curves and performance analysis results. Based on these results, it simulates the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam, yielding corresponding simulation results. An optimization module 500, based on the simulation results, determines whether the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam meet the corresponding performance requirements, obtaining the corresponding judgment results. Based on these results, the module optimizes the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam. This application facilitates the forward development of trailer crossbeams and rear guard plates, improves the development efficiency of trailer crossbeam and rear guard plate design, effectively shortens the development cycle of trailer crossbeams and rear guard plates, and effectively avoids quality problems in the pre-attachment stage of the trailer crossbeam and rear guard plate.

[0098] Figure 9 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include: The memory 901, the processor 902, and the computer program stored on the memory 901 and capable of running on the processor 902.

[0099] When the processor 902 executes the program, it implements the passenger car trailer crossbeam pre-hanging process strength performance design and optimization method provided in the above embodiments.

[0100] Furthermore, electronic devices also include: Communication interface 903 is used for communication between memory 901 and processor 902.

[0101] The memory 901 is used to store computer programs that can run on the processor 902.

[0102] The memory 901 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0103] If the memory 901, processor 902, and communication interface 903 are implemented independently, then the communication interface 903, memory 901, and processor 902 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 9 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0104] Optionally, in a specific implementation, if the memory 901, processor 902, and communication interface 903 are integrated on a single chip, then the memory 901, processor 902, and communication interface 903 can communicate with each other through an internal interface.

[0105] The processor 902 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0106] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for designing and optimizing the strength performance of pre-attached crossbeams for passenger vehicle trailers.

[0107] This application also provides a computer program product, including a computer program, which, when executed, is used to implement the above-described method for designing and optimizing the strength performance of the pre-attached crossbeam of a passenger vehicle trailer.

[0108] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0109] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0110] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0111] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0112] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0113] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0114] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0115] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A method for designing and optimizing the strength performance of a passenger car trailer crossbeam pre-coupling process, characterized in that, Includes the following steps: Acquire the trailer crossbeam assembly data of the target vehicle, and based on the trailer crossbeam assembly data, divide the trailer crossbeam into multiple meshes to establish a finite element model of the trailer crossbeam assembly; A partial body-in-white finite element model is obtained by truncating the pre-constructed body-in-white finite element model. Based on the preset actual process installation strategy of the trailer crossbeam, the trailer crossbeam assembly finite element model is assembled onto the partial body-in-white finite element model to form an assembly model. All meshes in the assembly model are subjected to quality checks to obtain corresponding check results, and material information corresponding to each component in the assembly model is obtained. Based on the material information and the check results, material properties and material nonlinear characteristics are assigned to each component. Boundary conditions and loads are set for the assembly model, and performance calculations are performed on the assembly model after setting boundary conditions and loads to generate energy history curves and performance analysis results. Based on the energy history curves and performance analysis results, simulation calculations are performed on the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam to obtain the corresponding simulation calculation results. Based on the simulation calculation results, it is determined whether the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam meet the corresponding performance requirements, so as to obtain the corresponding judgment results, and optimize the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam according to the judgment results.

2. The method for designing and optimizing the strength performance of the pre-attached crossbeam process for passenger vehicle trailers according to claim 1, characterized in that, The process of acquiring the trailer crossbeam assembly data of the target vehicle and, based on the trailer crossbeam assembly data, dividing the trailer crossbeam into multiple meshes to establish a finite element model of the trailer crossbeam assembly includes: Based on the trailer crossbeam assembly data provided in the design, the trailer crossbeam is divided into second-order tetrahedral meshes, and the corresponding parts of the trailer crossbeam to be refined are determined. The mesh refinement operation is then performed on the parts to be refined in order to establish the finite element model of the trailer crossbeam assembly.

3. The method for designing and optimizing the strength performance of the pre-attached crossbeam process for passenger vehicle trailers according to claim 1, characterized in that, The process involves truncating a pre-constructed finite element model of the body-in-white to obtain a partial finite element model of the body-in-white, and then, based on a pre-defined actual process installation strategy for the trailer crossbeam, assembling the finite element model of the trailer crossbeam assembly onto the partial finite element model of the body-in-white to form an assembly model. This includes: The latter half of the body-in-white finite element model is cut off to obtain the partial body-in-white finite element model. According to the actual process installation strategy of the trailer crossbeam, the trailer crossbeam assembly finite element model is assembled onto the partial body-in-white finite element model, so that the bottom of the pre-hanging hole of the trailer crossbeam coincides with the bottom of the bolt, in order to construct the assembly model.

4. The method for designing and optimizing the strength performance of the pre-attached crossbeam process for passenger vehicle trailers according to claim 1, characterized in that, The process of performing quality checks on all meshes in the assembly model to obtain corresponding check results includes: The Jacobian ratio, minimum size, minimum interior angle of the quadrilateral, minimum interior angle of the triangle, and proportion of the triangle element corresponding to the shell element quadrilateral mesh in the assembly model are checked to obtain the shell element quadrilateral mesh check results. The minimum dimensions and warpage of the second-order tetrahedral elements in the assembly model are checked to obtain the second-order tetrahedral element check results. Based on the shell element quadrilateral mesh check results and the second-order tetrahedral element check results, it is determined whether all the meshes meet the preset quality requirements. If there are meshes that do not meet the quality requirements, the meshes are adjusted accordingly.

5. The method for designing and optimizing the strength performance of the pre-attached crossbeam process for passenger vehicle trailers according to claim 1, characterized in that, The assembly model is subjected to boundary conditions and load settings, and performance calculations are performed on the assembly model after setting boundary conditions and loads to generate energy history curves and performance analysis results. Based on the energy history curves and performance analysis results, simulation calculations are performed on the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam to obtain corresponding simulation calculation results, including: Determine the target position within the target range of the trailer crossbeam assembly that meets the preset contact requirements, establish contact pairs and corresponding friction coefficients at the target positions, set surface-to-surface contact pairs between the pre-mounted bolts and the pre-mounted holes of the trailer crossbeam, and establish General_CONTACT contact connections at other positions to set boundary conditions and loads for the assembly model. The assembly model after setting boundary conditions and loads is subjected to performance calculations to generate the energy history curve and the performance analysis results. Based on the energy history curve and the performance analysis results, simulation calculations are performed on the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam to obtain the impact force of the bolts on the trailer crossbeam. The ratio of the impact force to the preset nominal cross-sectional area of ​​the bolts is calculated, and it is determined whether the ratio is less than the preset yield strength to obtain the simulation calculation results corresponding to the impact strength of the pre-attached bolts. After determining the plastic strain of the rear enclosure plate in the area where the pre-installed bolts are located, and judging whether the plastic strain is less than a preset threshold, the simulation calculation results corresponding to the strength of the rear enclosure plate are obtained. To determine whether the distance by which the trailer crossbeam slips on the pre-attached bolts after an impact is less than the length of the bolt, the simulation calculation results corresponding to the pre-attached stability of the trailer crossbeam are obtained.

6. The method for designing and optimizing the strength performance of the pre-attached crossbeam process for passenger vehicle trailers according to claim 4, characterized in that, Based on the simulation calculation results, it is determined whether the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam meet the corresponding performance requirements, so as to obtain the corresponding judgment results. Then, based on the judgment results, the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam are optimized, including: Determine whether the simulation analysis results meet the corresponding performance requirements; If the impact strength of the pre-attached bolt does not meet the corresponding performance requirements, replace the bolt diameter specification. When the strength of the rear enclosure plate does not meet the corresponding performance requirements, the target position and area that meet the preset stress requirements are locally reinforced according to the preset strain cloud diagram; When the pre-attached stability of the trailer crossbeam does not meet the corresponding performance requirements, the positions of the left and right pre-attached bolts are optimized.

7. A device for designing and optimizing the strength performance of a passenger vehicle trailer crossbeam pre-coupling process, characterized in that, include: The modeling module is used to acquire the trailer crossbeam assembly data of the target vehicle, and based on the trailer crossbeam assembly data, divide the trailer crossbeam into multiple meshes to establish a finite element model of the trailer crossbeam assembly. The assembly module is used to perform a cut operation on the pre-constructed body-in-white finite element model to obtain a partial body-in-white finite element model, and based on the preset actual process installation strategy of the trailer crossbeam, assemble the trailer crossbeam assembly finite element model onto the partial body-in-white finite element model to form an assembly model. The quality inspection module is used to perform quality inspection on all meshes in the assembly model to obtain the corresponding inspection results, and to obtain the material information corresponding to each component in the assembly model, so as to assign material properties and material nonlinear characteristics to each component based on the material information and the inspection results. The simulation calculation module is used to set boundary conditions and loads for the assembly model, and to perform performance calculations on the assembly model after setting boundary conditions and loads to generate energy history curves and performance analysis results. Based on the energy history curves and performance analysis results, the module performs simulation calculations on the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam to obtain the corresponding simulation calculation results. The optimization module is used to determine, based on the simulation calculation results, whether the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam meet the corresponding performance requirements, so as to obtain the corresponding judgment results, and optimize the impact strength of the pre-attached bolts, the strength of the rear guard plate, and the pre-attached stability of the trailer crossbeam according to the judgment results.

8. An electronic device, characterized in that, include: The method includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the strength performance design and optimization method for pre-attached crossbeams of passenger car trailers as described in any one of claims 1-6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the method for designing and optimizing the strength performance of the pre-attached crossbeam of a passenger car trailer as described in any one of claims 1-6.

10. A computer program product, comprising a computer program, characterized in that, The computer program is executed to implement the method for designing and optimizing the strength performance of the pre-attached crossbeam of a passenger car trailer as described in any one of claims 1-6.

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