An efficient simulation analysis method for complex multiple working conditions of a subframe, a medium and a system

Abstract

The application discloses a kind of complex multi-working condition high-efficiency simulation analysis method of subframe, medium and system, method includes steps: S1: obtaining the load spectrum of each hard point of subframe under different working conditions and normalizing treatment;S2: the finite element model of subframe is established, based on the working condition in specification load spectrum Load, form CAE model and export solving file;S3: the solving file is verified, and saved as template file;S4: extract load definition section text from template file, convert to load information table;S5: for next working condition, copy load data to load information table Replace original data, and convert table back to load text;S6: copy template file, replace load definition section text with modified load text in S5, submit calculation;S7: repeat S5 to S6, complete all working condition calculation, complete simulation analysis.The application has the advantages of high simulation analysis efficiency.

Description

Technical Field

[0001] This invention mainly relates to the field of subframe operating condition simulation technology, specifically to an efficient simulation analysis method, medium, and system for complex multi-condition subframes. Background Technology

[0002] Currently, in multi-condition static strength analysis of subframes, there can be as many as 20 to 30 different conditions. Each condition includes multiple loading points, and each loading point's load contains forces and moments in multiple directions. Existing simulation analysis methods require building an analysis model for each condition in the finite element analysis software ABAQUS, manually inputting numerous load values ​​based on the load spectrum. This analysis operation is extremely cumbersome, error-prone, and time-consuming, taking no less than 24 hours. This approach cannot meet the needs of high-efficiency multi-condition load analysis.

[0003] In the development of a single automotive component, sometimes it is only necessary to obtain the hard point load information of the component under working conditions to load the component and perform structural strength and durability simulation. It is not necessary to execute a whole set of complex processes from multibody dynamics simulation of the suspension system to load decomposition and load loading. This process requires secondary development and complex software interface call matching, which has a high threshold for use and is complicated to operate.

[0004] When performing strength simulation of the subframe in ABAQUS using existing technology, two problems arise. First, static strength analysis of the subframe involves 20-30 different working conditions, each requiring a large amount of force and torque data. Manually inputting these loads into the model for multiple working conditions involves hundreds or even thousands of input operations, making the process cumbersome and prone to errors. Second, when the subframe structure is adjusted or updated, the modeling and loading processes must be repeated, requiring much repetitive preprocessing work. This results in a very large workload, hinders the rapid verification of the effectiveness of structural optimization, significantly impacts development progress and efficiency, and is both inefficient and time-consuming. Summary of the Invention

[0005] To address the technical problems existing in the prior art, this invention provides a highly efficient simulation analysis method, medium, and system for complex multi-condition subframes with high simulation analysis efficiency.

[0006] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows: An efficient simulation analysis method for subframes under complex multi-condition conditions includes the following steps: S1: Obtain the load spectrum of each hard point of the subframe under different working conditions and perform normalization processing to form a normalized load spectrum; S2: Establish a finite element model of the subframe, apply loads based on one of the working conditions in the normalized load spectrum, form a CAE model including loading points, coupling relationships and boundary conditions, and export the solution file; S3: Verify the solution file. If the calculation is verified to be correct, save it as a template file. S4: Extract the load definition section text from the template file and convert it into a structured load information table; S5: For the next working condition, copy the corresponding load data into the load information table to replace the original data, and convert the table back into text format load text; S6: Copy the template file, replace the load definition section text in it with the load text obtained in S5, and submit the calculation; S7: Repeat S5 to S6 to complete the calculation of all working conditions in sequence and complete the simulation analysis.

[0007] Preferably, the specific process of step S1 is as follows: S1.1: In the dynamic analysis software, establish a multibody dynamic model of the vehicle suspension including the target subframe; apply excitation loads under different working conditions, and extract the loads at each connection point of the subframe; S1.2: Arrange the loads at each connection point in an Excel spreadsheet in the order of Fx, Fy, Fz, Mx, My, Mz to match the format of the finite element solution file.

[0008] Preferably, the specific process of step S2 is as follows: S2.1: Create the geometric model of the subframe in parametric modeling software and export the model file according to the common model digital exchange format; S2.2: Import the model file exported in S2.1 into the mesh generation software Hypermesh, mesh the model, and then export the mesh file; S2.3: Import the mesh file exported in S2.2 into the finite element analysis software ABAQUS to generate a simulation model. Name the isolated mesh component under the model Part-1 and assign material properties to each part of the component. S2.4: In the finite element analysis software ABAQUS, based on the coordinates of each connection point of the subframe, establish the set of loading points and coupling regions, and establish the coupling relationship; S2.5: Apply boundary conditions to the subframe: Create a set of regions for setting boundary conditions, and set corresponding boundary conditions for these sets; S2.6: Apply a load at the corresponding loading point according to the load information of one of the working conditions in the normalized load spectrum.

[0009] Preferably, the specific process of step S4 is as follows: S4.1: Open the template file using a text editor, search for and copy the load definition section text in the template file, and paste it into Word; S4.2: In Word, use spaces as delimiters to convert the load segment definition text into a structured load information table.

[0010] Preferably, the specific process of step S5 is as follows: S5.1: Based on the normalized load spectrum, create the calculation file for the next working condition; copy the connection point load data corresponding to the working condition in the normalized load spectrum, and batch paste them into the load information table to replace the corresponding load data; S5.2: After replacing all load data corresponding to the working condition, use Word to convert the table into text format, using spaces as delimiters, to form the modified load text.

[0011] Preferably, after step S7, step S8 is also included: when the subframe geometry model is updated, the new mesh model is imported into the CAE model for replacement, and after updating the set, S3 to S7 are repeated to complete the working condition verification of the new structure.

[0012] Preferably, the specific process of step S8 is as follows: S8.1: Mesh the updated subframe geometry model in the finite element preprocessing software Hypermesh and export the mesh file; S8.2: Import the mesh file into the CAE model in S2 to form a new simulation model; S8.3: In the new example model, reselect the node set for the boundary conditions and the node set for the coupling region; S8.4: Repeat S3-S7 to perform multi-condition strength verification of the new structure.

[0013] Preferably, in step S8.2, the structure is updated by replacing components while retaining the original loads, sets, and solution conditions, thereby forming a new calculation example model.

[0014] The present invention also discloses a computer-readable storage medium having a computer program stored thereon, the computer program performing the steps of the method described above when run by a processor.

[0015] The present invention further discloses an efficient simulation analysis system for complex multi-condition subframes, including a memory and a processor connected to each other. The memory stores a computer program, which executes the steps of the method described above when run by the processor.

[0016] Compared with the prior art, the advantages of the present invention are as follows: This invention constructs a complete workflow through steps S1 to S8, from load data formatting and baseline model template creation to data-driven automatic generation of multi-condition files. This method not only avoids repetitive manual operations in the GUI interface, greatly improving the efficiency of multi-condition analysis, but also significantly reduces the workload of re-simulation preprocessing due to design changes through the inheritance of model settings (S8), thereby achieving the goal of rapid verification during the development of subframe structures.

[0017] This invention enables efficient load application and multi-condition simulation analysis using only the multi-condition decomposed hardpoint load information of components provided by the OEM, without requiring any programming, making it simple and quick to use. This invention can rapidly perform static strength analysis of subframes under various conditions, simplifying the simulation analysis process, improving analysis and calculation efficiency, accelerating product development, and enabling rapid verification of structural development. It has significant advantages such as strong versatility, convenient and quick operation, strong engineering practicality, high calculation efficiency, and strong stability.

[0018] This invention, through formatting and applying the load spectrum, avoids the tedious manual loading within the finite element analysis software interface. Multi-condition analysis is faster and more efficient than traditional methods, significantly improving the efficiency of pre-processing for simulation calculations. It can now efficiently load and construct all analysis processes within just a few minutes, avoiding manual input errors and lengthy processing times. This invention proposes rapid matching after mesh replacement and geometric model updates, quickly re-analyzing all conditions, accelerating the multi-round iterative optimization process of structural analysis, rapidly verifying the effectiveness of structural optimization, and improving simulation analysis efficiency. Attached Figure Description

[0019] Figure 1 The flowchart in the embodiment is for the efficient simulation analysis method of the subframe under complex multi-condition conditions of the present invention.

[0020] Figure 2 This is a schematic diagram of the normalized load spectrum in an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the loading points and loads of the subframe in an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the load information segment text of the template file defined in the embodiment of the present invention, showing the original load information text extracted from the template file; (a) is the first part of the load information text, and (b) is the second part of the load information text.

[0023] Figure 5The embodiment of the present invention illustrates the representation of load information created by converting load information text, showing the form after importing the load information text into Word software and converting it into a load information table; wherein (a) is the first part of the load information table, (b) is the second part of the load information table, and (c) is the third part of the load information table.

[0024] Figure 6 This is a stress cloud diagram for static strength analysis of the subframe in an embodiment of the present invention. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 As shown, the high-efficiency simulation analysis method for complex multi-condition subframes provided in this embodiment of the invention specifically includes the following steps: S1: Utilize multibody dynamics simulation software (such as ADAMS or SIMPACK) to establish a dynamic model of the entire vehicle or suspension system. Calculate the vehicle's dynamics model and extract the loads at the connection points (hard points) between the subframe and the body, suspension, etc., under different operating conditions. Standardize and format the load spectrum in Excel to match the format of the subsequent simulation calculation solution file, forming a standardized load spectrum, such as... Figure 2 As shown.

[0027] The purpose of this step is to generate a standardized load data file that can be easily read and used in subsequent processes. The specific process is as follows: S1.1: In the dynamic analysis software, establish a multibody dynamic model of the vehicle suspension including the target subframe; apply excitation loads under different working conditions (such as vertical impact, braking, turning, acceleration and other typical working conditions) and extract the loads at each connection point of the subframe. S1.2: Organize the loads into an Excel spreadsheet and create a standardized table: the loads at each connection point are in a column, arranged in the order of Fx, Fy, Fz, Mx, My, Mz, to match the instruction format of concentrated forces and moments defined in the finite element solution INP file.

[0028] S2: Establish the subframe geometric model, perform preprocessing mesh generation on the geometric model, generate a finite element mesh file, and import it into the finite element analysis software ABAQUS. In ABAQUS, based on the coordinates of the connection points of the peripheral components of the subframe, establish sets of loading points and coupling regions, and establish coupling relationships between the corresponding sets of loading points and coupling regions; simultaneously, establish a set of node conditions for boundary conditions based on the actual constraints, and apply boundary conditions to the model; finally, apply one of the load conditions from the normalized load spectrum, forming a CAE model that includes loading points, loads, coupling relationships, and boundary conditions.

[0029] This step aims to create a baseline finite element model that includes complete model settings (such as mesh, materials, connectivity, boundary conditions, etc.) and initial loads. The specific implementation is as follows: S2.1: Create the geometric model of the subframe in parametric modeling software and export the file according to the common model digital exchange format; S2.2: Import the model file exported in S2.1 into the mesh generation software Hypermesh, mesh the model, and then export the mesh file; S2.3: Import the mesh file exported in S2.2 into the finite element analysis software ABAQUS to generate a simulation model. Name the isolated mesh component under the model Part-1 and assign material properties to each part of the component.

[0030] S2.4: In the finite element analysis software ABAQUS, based on the coordinates of each connection point of the subframe, establish loading points. For each loading point, create a Set, naming it according to a specific naming convention: Set-RP1, Set-RP2…Set-RPX, and so on. Establish a Set for the coupling region corresponding to each loading point, naming it according to a specific naming convention: Set-Coup1, Set-Coup2…Set-CoupX, and so on. Establish the coupling relationship between the corresponding loading point set and the coupling region set.

[0031] S2.5: Apply boundary conditions to the subframe: Create a set of regions for setting boundary conditions, and set corresponding boundary conditions for these sets.

[0032] S2.6: Load information for one type of working condition, compiled according to S1.2, is used to apply loads at the corresponding loading points, such as... Figure 3 As shown, Figure 3 In the diagram, RP1, RP2, RP3… represent loading points, and the arrow symbols indicate the applied forces and moments. Save the CAE model file. At this point, a complete analysis model containing specific loads is ready.

[0033] S3: Export the model with the single-load case already loaded as an ABAQUS solver file, and submit the solver file for calculation. After verifying that the model can complete the calculation normally, save the solver file as a template file. This template file retains the complete model settings, boundary conditions, coupling relationships, and load occupancy structures, serving as the baseline file for subsequent multi-load case analysis.

[0034] The purpose of this step is to extract a reusable analysis framework from the already configured CAE model. The specific process is as follows: S3.1: Check if the finite element calculation model is set up correctly, export the solution file and submit the calculation.

[0035] S3.2: If the model can converge normally and produce correct results, the solution file is considered to be a calculation template for solving other working conditions, and the solution file is saved as a template file. This template file contains all analysis settings information.

[0036] S4: After extracting the load segment text from the solution file in S3, perform standardized formatting to form a structured load information table.

[0037] This step is crucial for achieving automated load replacement. It converts the load information in the template file into an easily editable intermediate format. The specific process is as follows: S4.1: Open the template file from S3.2 using a text editor, search for and copy the text of the load definition section, such as... Figure 4 As shown, paste it into Word.

[0038] S4.2: In Word, using spaces as delimiters, convert the load segment definition text copied in S4.1 into a table format. In the table, the original text-based load values ​​are divided into columns, making it easy to copy and paste the load value text to the corresponding locations. Save this table as a load information table, such as... Figure 5 As shown in the table, this table establishes a clear correspondence between load locations and load values.

[0039] S5: Perform the calculation for the next working condition. Based on the load data of this working condition, copy the load data of the corresponding point in S1, replace it in the load information table, and then convert the load information table back to text format.

[0040] This step demonstrates how to quickly prepare data for a new operating condition using the results of steps S1 and S4. The specific steps are as follows: S5.1: Based on the load table compiled in S1.2, create the calculation file for the next working condition. Copy the connection point load values ​​corresponding to this working condition from the load table and batch paste them into the load information table created in S4.2 to replace the corresponding load values.

[0041] S5.2: After replacing all load values ​​for the working condition in S5.1, use spaces as delimiters to convert the table into text format using Word, forming the modified load text. This text is formatted exactly the same as the load section in the original template.

[0042] S6: Copy the template file in S3, replace the load text field in the template file with the modified load text in S5, save and submit the calculation.

[0043] This step automatically generates the new load case analysis file. Specifically, it involves copying the template file from step S3.2, replacing the load text in the template file with the modified load text from step S5.2, saving the template file, and submitting the calculation. This simple text replacement generates a completely new solution file containing the new load case.

[0044] S7: Repeat S5 and S6 to calculate the next working condition.

[0045] This step outlines the core iterative process of multi-condition batch analysis, specifically: calculating the next condition for subframe strength verification. Repeat steps S5-S6, save as a new calculation file, submit the calculation, and then proceed to solve for the next condition. Each condition will generate a file like... Figure 6 The stress cloud diagram of the subframe static strength analysis shown is ultimately used to evaluate whether the strength of the subframe meets the requirements under this working condition.

[0046] S8: If the geometric model is modified or updated, the updated geometric model is meshed and then imported into the CAE model in S2 for overlay replacement. The boundary conditions and the set of coupled regions are updated. S3-S7 are repeated to perform multi-condition verification of the new structure.

[0047] During the product design process, the subframe structure typically requires multiple rounds of iterative optimization. If the subframe's geometric model is modified, the new structure can be quickly and easily simulated and verified by executing S8.

[0048] This step demonstrates another key advantage of the method of the present invention: it enables the efficient reuse of most analysis settings during design changes. The specific process is as follows: S8.1: Mesh the updated geometric model in the finite element preprocessing software Hypermesh and export the mesh file.

[0049] S8.2: Import the mesh file from S8.1 into the CAE model in S2 to create a new simulation model. Name the isolated mesh components in the new simulation model the same as those in S2.1 (Part-1 in this case). By copying the components from the new simulation model to the simulation components in S2.1 to overwrite and replace them, the components can be updated, while the set loads, sets, solution conditions, etc. are retained without needing to be redefined, thus forming an updated simulation model.

[0050] S8.3: In the example model updated in S8.2, the node sets for boundary conditions and coupled regions are reselected. This is because the mesh node numbers may have changed.

[0051] S8.4: Repeat S3.1 to S7 to perform multi-condition strength verification of the new structure. Based on the updated model and existing load spectrum, quickly complete a new round of analysis.

[0052] Through the steps S1 to S8 described above, this invention constructs a complete workflow from load data formatting and baseline model template creation to data-driven automatic generation of multi-condition files. This method not only avoids repetitive manual operations in the GUI interface, greatly improving the efficiency of multi-condition analysis, but also significantly reduces the workload of re-simulation preprocessing due to design changes through the inheritance of model settings (S8), thereby achieving the goal of rapid verification during the development of subframe structures.

[0053] This invention enables efficient load application and multi-condition simulation analysis using only the multi-condition decomposed hardpoint load information of components provided by the OEM, without requiring any programming, making it simple and quick to use. This invention can rapidly perform static strength analysis of subframes under various conditions, simplifying the simulation analysis process, improving analysis and calculation efficiency, accelerating product development, and enabling rapid verification of structural development. It has significant advantages such as strong versatility, convenient and quick operation, strong engineering practicality, high calculation efficiency, and strong stability.

[0054] This invention, through formatting and applying the load spectrum, avoids the tedious manual loading within the finite element analysis software interface. Multi-condition analysis is faster and more efficient than traditional methods, significantly improving the efficiency of pre-processing for simulation calculations. It can now efficiently load and construct all analysis processes in just over ten minutes, avoiding manual input errors and lengthy processing times. This invention proposes rapid matching after mesh replacement and geometric model updates, enabling quick re-analysis of all conditions; it accelerates the multi-round iterative optimization process of structural analysis, rapidly verifies the effectiveness of structural optimization, and improves simulation analysis efficiency.

[0055] The present invention also discloses a computer-readable storage medium having a computer program stored thereon, the computer program performing the steps of the method described above when run by a processor.

[0056] The present invention further discloses an efficient simulation analysis system for complex multi-condition subframes, including a memory and a processor connected to each other. The memory stores a computer program, which executes the steps of the method described above when run by the processor.

[0057] The medium and system of the present invention, corresponding to the methods described above, also have the advantages described above.

[0058] The present invention can implement all or part of the processes in the methods of the above embodiments, or it can be implemented by hardware related to computer program instructions. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, it can implement the steps of the above method embodiments. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable storage medium includes: any entity or device capable of carrying computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. The memory is used to store computer programs and / or modules. The processor implements various functions by running or executing the computer programs and / or modules stored in the memory, and by calling data stored in the memory. The memory may include high-speed random access memory, as well as non-volatile memory, such as hard disks, RAM, plug-in hard disks, smart media cards (SMC), secure digital (SD) cards, flash cards, at least one disk storage device, flash memory device, or other volatile solid-state storage devices.

[0059] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A highly efficient simulation analysis method for complex multi-condition subframes, characterized in that, Including the following steps: S1: Obtain the load spectrum of each hard point of the subframe under different working conditions and perform normalization processing to form a normalized load spectrum; S2: Establish a finite element model of the subframe, apply loads based on one of the working conditions in the normalized load spectrum, form a CAE model including loading points, coupling relationships and boundary conditions, and export the solution file; S3: Verify the solution file. If the calculation is verified to be correct, save it as a template file. S4: Extract the load definition section text from the template file and convert it into a structured load information table; S5: For the next working condition, copy the corresponding load data into the load information table to replace the original data, and convert the table back into text format load text; S6: Copy the template file, replace the load definition section text in it with the load text obtained in S5, and submit the calculation; S7: Repeat S5 to S6 to complete the calculation of all working conditions in sequence and complete the simulation analysis.

2. The efficient simulation analysis method for complex multi-condition subframes according to claim 1, characterized in that, The specific process of step S1 is as follows: S1.1: In the dynamic analysis software, establish a multibody dynamic model of the vehicle suspension including the target subframe; apply excitation loads under different working conditions, and extract the loads at each connection point of the subframe; S1.2: Arrange the loads at each connection point in an Excel spreadsheet in the order of Fx, Fy, Fz, Mx, My, Mz to match the format of the finite element solution file.

3. The efficient simulation analysis method for complex multi-condition subframes according to claim 1, characterized in that, The specific process of step S2 is as follows: S2.1: Create the geometric model of the subframe in parametric modeling software and export the model file according to the common model digital exchange format; S2.2: Import the model file exported in S2.1 into the mesh generation software Hypermesh, mesh the model, and then export the mesh file; S2.3: Import the mesh file exported in S2.2 into the finite element analysis software ABAQUS to generate a calculation example model. Name the isolated mesh component under the model as Part-1 and assign material properties to each part of the component. S2.4: In the finite element analysis software ABAQUS, based on the coordinates of each connection point of the subframe, establish the set of loading points and coupling regions, and establish the coupling relationship; S2.5: Apply boundary conditions to the subframe: Create a set of regions for setting boundary conditions, and set corresponding boundary conditions for these sets; S2.6: Apply a load at the corresponding loading point according to the load information of one of the working conditions in the normalized load spectrum.

4. The efficient simulation analysis method for complex multi-condition subframes according to claim 1, 2, or 3, characterized in that, The specific process of step S4 is as follows: S4.1: Open the template file using a text editor, search for and copy the load definition section text in the template file, and paste it into Word; S4.2: In Word, use spaces as delimiters to convert the load segment definition text into a structured load information table.

5. The efficient simulation analysis method for complex multi-condition subframes according to claim 1, 2, or 3, characterized in that, The specific process of step S5 is as follows: S5.1: Based on the normalized load spectrum, create the calculation file for the next working condition; copy the connection point load data corresponding to the working condition in the normalized load spectrum, and batch paste them into the load information table to replace the corresponding load data; S5.2: After replacing all load data corresponding to the working condition, use Word to convert the table into text format, using spaces as delimiters, to form the modified load text.

6. The efficient simulation analysis method for complex multi-condition subframes according to claim 1, 2, or 3, characterized in that, After step S7, step S8 is also included: when the subframe geometry model is updated, the new mesh model is imported into the CAE model for replacement. After updating the set, S3 to S7 are repeated to complete the working condition verification of the new structure.

7. The efficient simulation analysis method for complex multi-condition subframes according to claim 6, characterized in that, The specific process of step S8 is as follows: S8.1: Mesh the updated subframe geometry model in the finite element preprocessing software Hypermesh and export the mesh file; S8.2: Import the mesh file into the CAE model in S2 to form a new simulation model; S8.3: In the new example model, reselect the node set for the boundary conditions and the node set for the coupling region; S8.4: Repeat S3-S7 to perform multi-condition strength verification of the new structure.

8. The efficient simulation analysis method for complex multi-condition subframes according to claim 7, characterized in that, In step S8.2, the structure is updated by replacing components, while retaining the original loads, sets and solution conditions, thereby forming a new calculation example model.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, The computer program, when run by a processor, performs the steps of the method as described in any one of claims 1-8.

10. A high-efficiency simulation analysis system for complex multi-condition subframes, comprising interconnected memory and processor, wherein the memory stores computer programs, characterized in that, The computer program, when run by a processor, performs the steps of the method as described in any one of claims 1-8.

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