Decoupling point arrangement method, arrangement device, electronic device and storage medium of vehicle
By conducting sensitivity analysis on the finite element model of the vehicle body-in-white, evaluating and rationally arranging decoupling points, the problem of high cost or structural weakening caused by unreasonable decoupling point arrangement in the prior art is solved, thus achieving cost control and performance assurance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BEIJING AUTOMOBILE RES GENERAL INST
- Filing Date
- 2026-01-14
- Publication Date
- 2026-06-09
AI Technical Summary
In the vehicle production process, existing technologies make it difficult to reasonably arrange decoupling points, resulting in high vehicle production costs or unreliable structural performance.
Sensitivity analysis was performed on the finite element model of the vehicle's body-in-white to assess the importance of each decoupling point. Based on the importance, the points were arranged reasonably, and the final location of the decoupling points was determined using the sensitivity analysis objectives and constraints.
This approach achieves the goal of controlling vehicle production costs while ensuring overall vehicle structural performance, improving the rationality of decoupling point layout, and avoiding excessive costs or structural weakening caused by too many or too few decoupling points.
Smart Images
Figure CN122174525A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of vehicle manufacturing technology, and in particular to a method for arranging decoupling points in a vehicle, an electronic device, a computer-readable storage medium, and a device for arranging decoupling points in a vehicle. Background Technology
[0002] During vehicle production, the body and frame are connected by a number of bolts, and each set of bolt installation points is called a decoupling point. In related technologies, the location of decoupling points is based on the experience of technicians, which makes it difficult to ensure the rationality of the decoupling point layout of the vehicle, and is not conducive to the control of vehicle production costs and structural performance. Summary of the Invention
[0003] The present invention aims to solve the technical problems mentioned in the background. Therefore, the first objective of the present invention is to propose a method for arranging decoupling points in a vehicle. This method utilizes sensitivity analysis of the finite element model of the vehicle's body-in-white to evaluate the importance of each decoupling point. Based on the importance of each decoupling point, the decoupling points are rationally arranged and planned, thereby ensuring the overall vehicle structural performance while controlling vehicle production costs.
[0004] The second objective of this invention is to provide an electronic device.
[0005] A third objective of this invention is to provide a computer-readable storage medium.
[0006] The fourth objective of this invention is to provide a decoupling point arrangement device for a vehicle.
[0007] To achieve the above objectives, a first aspect of the present invention proposes a method for arranging decoupling points of a vehicle. The method includes: determining a vehicle-in-white finite element model, wherein the vehicle-in-white finite element model includes multiple decoupling points for connecting the vehicle body and frame; performing modal analysis on the vehicle-in-white finite element model to determine sensitivity analysis objectives and constraints; performing sensitivity analysis on the vehicle-in-white finite element model based on the sensitivity analysis objectives and constraints to determine the importance of each decoupling point; and determining the final arrangement positions of the multiple decoupling points according to the importance of each decoupling point.
[0008] According to the vehicle decoupling point arrangement method of the present invention, the following steps are taken: First, a finite element model of the vehicle body-in-white is determined. This finite element model includes multiple decoupling points connecting the vehicle body and frame. Then, modal analysis is performed on the finite element model to determine sensitivity analysis targets and constraints. Further, sensitivity analysis is performed on the finite element model based on the sensitivity analysis targets and constraints to determine the importance of each decoupling point. Finally, the final arrangement positions of the multiple decoupling points are determined based on the importance of each decoupling point. Thus, this method utilizes sensitivity analysis of the vehicle's body-in-white finite element model to evaluate the importance of each decoupling point, thereby enabling reasonable arrangement and planning of the decoupling points based on their importance. This ensures the overall vehicle structural performance while controlling vehicle production costs.
[0009] In addition, the vehicle decoupling point arrangement method according to the above embodiments of this application may also have the following additional technical features: According to one embodiment of the present invention, modal analysis is performed on a finite element model of a white vehicle to determine the sensitivity analysis target and sensitivity analysis constraints, including: performing free modal analysis on the finite element model of the white vehicle to determine the first torsional mode and the first bending mode corresponding to the finite element model of the white vehicle; determining the sensitivity analysis target based on the first torsional mode; and determining the sensitivity analysis constraints based on the first bending mode.
[0010] According to one embodiment of the present invention, determining a sensitivity analysis target based on a first torsional mode includes: using the frequency of the first torsional mode as a sensitivity analysis target parameter; maximizing the sensitivity analysis target parameter as the sensitivity analysis target; determining a sensitivity analysis constraint based on a first bending mode includes: using the frequency of the first bending mode as a sensitivity analysis constraint parameter; obtaining the difference between the frequency value of the first bending mode and a preset frequency value to obtain a target bending mode frequency value; and ensuring that the value of the sensitivity analysis constraint parameter is greater than or equal to the target bending mode frequency value as the sensitivity analysis constraint.
[0011] According to one embodiment of the present invention, sensitivity analysis is performed on a finite element model of a vehicle based on sensitivity analysis objectives and sensitivity analysis constraints to determine the importance of each decoupling point. This includes: constructing a sensitivity analysis function based on the finite element model of the vehicle and the sensitivity analysis objectives, wherein the variable of the sensitivity analysis function is the stiffness value of each decoupling point; performing sensitivity analysis based on the sensitivity analysis objectives, sensitivity analysis constraints, the sensitivity analysis function, and a preset range of stiffness values for each decoupling point to determine the degree of influence of stiffness changes at each decoupling point on the sensitivity analysis objectives; and determining the importance of each decoupling point based on the degree of influence of stiffness changes at each decoupling point on the sensitivity analysis objectives, wherein importance is positively correlated with the degree of influence.
[0012] According to one embodiment of the present invention, determining the final arrangement position of multiple decoupling points based on the importance of each decoupling point includes: determining a decoupling point arrangement diagram of the vehicle, wherein the decoupling point arrangement diagram corresponds to the finite element model of the vehicle and includes the initial position of each decoupling point; mapping the importance of each decoupling point to the corresponding decoupling point in the decoupling point arrangement scenario to obtain a target decoupling point arrangement diagram; performing image analysis on the target decoupling point arrangement diagram, and determining the final arrangement position of multiple decoupling points based on the image analysis results.
[0013] According to one embodiment of the present invention, image analysis is performed on a schematic diagram of the target decoupling point arrangement, and the final arrangement positions of multiple decoupling points are determined based on the image analysis results, including: performing traversal analysis on the schematic diagram of the target decoupling point arrangement based on a preset sliding window to obtain the number of decoupling points corresponding to each preset sliding window; and determining the final arrangement positions of multiple decoupling points based on the number of decoupling points corresponding to each preset sliding window and the importance of each decoupling point.
[0014] According to one embodiment of the present invention, determining the final arrangement position of multiple decoupling points based on the decoupling point density corresponding to each preset sliding window and the importance of each decoupling point includes: when the number of first target decoupling points in the preset sliding window is greater than a first preset number, deleting the first target decoupling points in the preset sliding window to determine the final arrangement position of multiple decoupling points in the preset sliding window, wherein the importance of the first target decoupling point is lower than the first preset importance; when the number of second target decoupling points in the preset sliding window is greater than a second preset number, adding the second target decoupling points in the preset sliding window to determine the final arrangement position of multiple decoupling points in the preset sliding window, wherein the importance of the second target decoupling point is higher than the second preset importance, and the second preset importance is higher than the first preset importance.
[0015] To achieve the above objectives, a second aspect of the present invention provides an electronic device, including a memory, a processor, and a vehicle decoupling point arrangement program stored in the memory and executable on the processor. When the processor executes the vehicle decoupling point arrangement program, it implements the above-described vehicle decoupling point arrangement method.
[0016] According to the embodiments of this application, when the processor executes the vehicle decoupling point arrangement program, the above-mentioned vehicle decoupling point arrangement method is implemented. Based on the above-mentioned vehicle decoupling point arrangement method, the decoupling points of the vehicle are reasonably arranged and planned, so as to control the vehicle production cost while ensuring the overall vehicle structural performance.
[0017] To achieve the above objectives, a third aspect of the present invention provides a computer-readable storage medium storing a vehicle decoupling point arrangement program thereon, which, when executed by a processor, implements the above-described vehicle decoupling point arrangement method.
[0018] According to the computer-readable storage medium of the present application embodiment, when the vehicle decoupling point arrangement program is executed by the processor, the above-described vehicle decoupling point arrangement method is implemented. Based on the above-described vehicle decoupling point arrangement method, the decoupling points of the vehicle are reasonably arranged and planned, so as to control the vehicle production cost while ensuring the overall vehicle structural performance.
[0019] To achieve the above objectives, a fourth aspect of the present invention provides a decoupling point arrangement device for a vehicle. The device includes: a determination module for determining a white-body finite element model corresponding to the vehicle, wherein the white-body finite element model includes multiple decoupling points for connecting the vehicle body and frame; a modal analysis module for performing modal analysis on the white-body finite element model to determine sensitivity analysis targets and sensitivity analysis constraints; a sensitivity analysis module for performing sensitivity analysis on the white-body finite element model based on the sensitivity analysis targets and sensitivity analysis constraints to determine the importance of each decoupling point; and a decoupling point arrangement module for determining the final arrangement positions of the multiple decoupling points according to the importance of each decoupling point.
[0020] According to an embodiment of the present invention, a vehicle decoupling point arrangement device determines the corresponding vehicle body finite element model through a determination module. The vehicle body finite element model includes multiple decoupling points connecting the vehicle body and frame. A modal analysis module performs modal analysis on the vehicle body finite element model to determine sensitivity analysis targets and constraints. A sensitivity analysis module performs sensitivity analysis on the vehicle body finite element model based on the sensitivity analysis targets and constraints to determine the importance of each decoupling point. Finally, a decoupling point arrangement module determines the final arrangement positions of the multiple decoupling points based on the importance of each decoupling point. Therefore, this device utilizes sensitivity analysis of the vehicle body finite element model to evaluate the importance of each decoupling point, thereby rationally arranging and planning the decoupling points based on their importance, ensuring the overall vehicle structural performance while controlling vehicle production costs. Attached Figure Description
[0021] Figure 1 A schematic diagram of a skateboard platform for a vehicle in related technologies; Figure 2 This is a flowchart of a vehicle decoupling point arrangement method according to some embodiments of this application; Figure 3 This is a schematic diagram of decoupling points according to some embodiments of this application; Figure 4This is a schematic diagram of torsional modes according to some embodiments of this application; Figure 5 This is a schematic diagram of a bending module according to some embodiments of this application; Figure 6 This is a schematic diagram of the target decoupling point arrangement according to a specific embodiment of this application; Figure 7 This is a flowchart of a vehicle decoupling point arrangement method according to a specific embodiment of this application; Figure 8 This is a block diagram of an electronic device according to some embodiments of the present invention; Figure 9 This is a schematic diagram of the connection of a vehicle decoupling point arrangement device according to some embodiments of the present invention. Detailed Implementation
[0022] The following describes in detail, with reference to the accompanying drawings, the decoupling point arrangement method, arrangement device, electronic device, and storage medium of the vehicle according to embodiments of the present invention.
[0023] In pure electric new energy vehicles, the integration of power batteries with the vehicle body has evolved from CTP (Cell to Pack, module-free battery technology) to CTB (Cell to Body, integrated battery and vehicle body technology). CTP refers to integrating battery cells into the battery pack, eliminating the traditional battery module stage. By reducing structural components (such as end plates and side plates) and optimizing cell arrangement, it improves the space utilization and energy density of the battery pack, and supports battery swapping. CTB deeply integrates the battery pack with the vehicle body structure, making the battery system both an energy carrier and a structural component. This essentially combines the battery cover and the vehicle floor into a "sandwich" structure, with the battery cover serving as the vehicle floor. Blade batteries are arranged in a honeycomb-like aluminum plate format between the tray and the floor, ultimately achieving a rigid connection between the battery and the vehicle body. By eliminating the separate battery pack through CTB technology, the vertical space inside the vehicle increases, while the battery volume utilization rate improves to 66%. More cells can be accommodated in the same space, significantly increasing the driving range. Furthermore, it simplifies the assembly process, reduces the number of parts, and lowers production costs. However, after adopting CTB technology, vehicle battery repairs require complete replacement, which is costly.
[0024] A skateboard platform is a type of CTB (Cartridge Toy) and consists of two parts: the frame and the chassis. The frame contains the battery cells. A skateboard platform is like... Figure 1 As shown, the body and frame are connected together by several bolts, and the installation points of each group of bolts are called decoupling points.
[0025] The arrangement of decoupling points between the vehicle body and frame in a skateboarding platform is a problem that needs to be solved. An unreasonable arrangement of decoupling points can lead to many problems. For example, too many decoupling points will result in excessively high vehicle costs, longer manufacturing time, and reduced product competitiveness; too few decoupling points will weaken the vehicle structure and compromise its structural performance.
[0026] To address the aforementioned technical issues, this application proposes a method for arranging decoupling points in a vehicle. By conducting sensitivity analysis on the finite element model of the vehicle's white body, the importance of each decoupling point to the vehicle's modes is determined. Then, the decoupling points are arranged according to their importance, improving the rationality of the arrangement of multiple decoupling points. This ensures the overall vehicle structural performance while controlling vehicle production costs.
[0027] The decoupling point arrangement method of the vehicle in this application will be described in detail below with reference to the accompanying drawings.
[0028] Figure 2 This is a flowchart of a vehicle decoupling point arrangement method according to some embodiments of the present invention.
[0029] Reference Figure 2 The vehicle decoupling point arrangement method of this invention may include the following steps: S1, determine the white car finite element model corresponding to the vehicle, wherein the white car finite element model includes multiple decoupling points for connecting the vehicle body and frame; Specifically, based on finite element analysis, a finite element model of the vehicle's skateboard platform is established. In this model, rigid elements at several decoupling points between the vehicle body and frame are replaced with zero-length elastic elements. The stiffness values of these elements in the three translational directions are assigned a maximum value of 1 × 10⁵. Figure 3 As shown, the stiffness value of each decoupling point is a variable in the subsequent sensitivity analysis.
[0030] S2, Perform modal analysis on the finite element model of the white car to determine the sensitivity analysis target and sensitivity analysis constraints; Specifically, the sensitivity analysis objective refers to the performance index or design goal to be achieved during the sensitivity analysis optimization process. This is typically achieved by optimizing design variables, such as modal frequency targets and mode shape targets. Sensitivity analysis constraints refer to the limitations that must be met during the sensitivity analysis optimization process. These constraints ensure the feasibility of the optimization results in practical engineering applications, such as stability constraints and strength constraints. It can be understood that this sensitivity analysis process aims to obtain the importance of each decoupling point; therefore, the variable in this sensitivity analysis process is the stiffness value of each decoupling point.
[0031] After determining the vehicle's white finite element model, modal analysis is performed on the white finite element model using finite element analysis software to obtain modal data closely related to parameters such as vehicle comfort and dynamic performance, such as modal frequencies. Based on the modal analysis results, sensitivity analysis targets and constraints are determined for sensitivity analysis, providing guidance for subsequent decoupling point optimization.
[0032] S3. Based on the sensitivity analysis objectives and sensitivity analysis constraints, sensitivity analysis is performed on the finite element model of the white car to determine the importance of each decoupling point. In other words, during the sensitivity analysis of the finite element model of the vehicle, under the constraints of sensitivity analysis, the stiffness value of each decoupling point is adjusted within a preset stiffness range to make the sensitivity analysis result approach the sensitivity analysis target. The importance of each decoupling point is then determined based on the data changes during the sensitivity analysis process. For example, the importance of each decoupling point can be determined based on the degree of influence of its stiffness value change on the sensitivity analysis result. If the stiffness change of a decoupling point has a significant impact on the change of the sensitivity result toward the sensitivity analysis target, that decoupling point is assigned a higher importance; if the stiffness change has a smaller impact, that decoupling point is assigned a lower importance. Specifically, this can be achieved by obtaining the maximum ratio between the stiffness change of each decoupling point and the change of the sensitivity result toward the sensitivity analysis target, and then obtaining the importance of the corresponding decoupling point based on the maximum ratio and a preset mapping table. Alternatively, the importance of each decoupling point can also be determined based on the degree of influence of its stiffness value on the change of the sensitivity analysis result toward the sensitivity analysis target, without any specific restrictions.
[0033] S4. Determine the final arrangement of multiple decoupling points based on the importance of each decoupling point.
[0034] Specifically, the importance of a decoupling point characterizes its influence on the vehicle's sensitivity analysis target; the higher the importance, the greater the influence. For example, when the importance of a decoupling point is high, the number of decoupling points in the corresponding area can be increased to ensure the vehicle's structural performance; when the importance of a decoupling point is low, the number of decoupling points with lower importance in the corresponding area can be reduced to lower vehicle production costs while ensuring vehicle structural performance.
[0035] This embodiment establishes a finite element model of the vehicle body, transforms rigid connection decoupling points into elastic connections, uses the Z-axis stiffness value of the decoupling points as a variable for sensitivity analysis, and determines the sensitivity analysis target and constraints based on the modal analysis results. Sensitivity analysis is then performed on the finite element model of the vehicle body. The importance of each decoupling point is determined based on its influence on the vehicle's modal characteristics. The final positions of the decoupling points are then arranged to improve the rationality of the arrangement. This prevents technical problems such as excessive vehicle cost and extended manufacturing time due to an excessive number of decoupling points, or weakened vehicle structure and compromised structural performance due to an insufficient number of decoupling points.
[0036] In one embodiment of the present invention, modal analysis is performed on the finite element model of the vehicle to determine the sensitivity analysis target and sensitivity analysis constraints, including: performing free modal analysis on the finite element model of the vehicle to determine the first torsional mode and the first bending mode corresponding to the finite element model of the vehicle; determining the sensitivity analysis target based on the first torsional mode; and determining the sensitivity analysis constraints based on the first bending mode.
[0037] Specifically, free modal analysis refers to obtaining the free vibration characteristics of a finite element model of a vehicle without external constraints or forces, in order to determine the natural frequencies and mode shapes of the finite element model.
[0038] Modal analysis of the finite element model of the vehicle body was conducted to obtain the first torsional mode and the first bending mode. These modes describe the vibration characteristics of the finite element model in different directions. The first torsional mode refers to the mode with the lowest frequency in the torsional vibration direction. In this mode, the structure of the finite element model mainly undergoes torsional vibration around a certain axis, typically exhibiting a mode shape of asynchronous motion on both sides, such as... Figure 4 As shown, the frequency of the first torsional mode can be recorded at this time. The first-order bending mode refers to the mode with the lowest frequency in the bending vibration direction of the finite element model of the white car. Under this mode, the structure of the finite element model of the white car mainly undergoes bending vibration in the direction perpendicular to a certain axis. The mode shape is usually characterized by the synchronous motion of both sides of the front longitudinal beam, such as... Figure 5 As shown, the frequency of the first bending mode can be recorded at this time. .
[0039] Modal analysis of the finite element model of the white vehicle yielded two responses: the first torsional mode and the first bending mode. The sensitivity analysis target, such as the frequency of the first torsional mode, was determined based on the first torsional mode. Determine the sensitivity analysis target and the sensitivity analysis constraints based on the first-order bending mode, such as the frequency of the first-order bending mode. Determine the data range for sensitivity analysis constraints.
[0040] In one embodiment of the present invention, determining the sensitivity analysis target based on the first torsional mode includes: using the frequency of the first torsional mode as the sensitivity analysis target parameter; maximizing the sensitivity analysis target parameter as the sensitivity analysis target; determining the sensitivity analysis constraint based on the first bending mode includes: using the frequency of the first bending mode as the sensitivity analysis constraint parameter; obtaining the difference between the frequency value of the first bending mode and a preset frequency value to obtain the target bending mode frequency value; and ensuring that the value of the sensitivity analysis constraint parameter is greater than or equal to the target bending mode frequency value as the sensitivity analysis constraint.
[0041] Specifically, based on vibration theory and engineering application experience, modes with lower frequencies are more easily excited and contribute more to the overall vibration. Based on modal analysis results, the torsional mode frequency of the finite element model of the white car is determined to be lower than the bending mode frequency. Therefore, the torsional mode contributes more to the overall vibration. Thus, the frequency of the first-order torque mode is used as the target parameter for sensitivity analysis, with the goal of maximizing the frequency of the first-order torque mode during the sensitivity analysis process. The frequency of the first-order bending mode is used as the constraint parameter for sensitivity analysis, based on the frequency of the first-order bending mode obtained from the modal analysis. The constraint data range is determined, and the sensitivity analysis constraint is that the frequency of the first-order torque mode in the sensitivity analysis process is ≥ -1Hz, where 1Hz is the preset frequency value, which can be set according to the actual situation.
[0042] In one embodiment of the present invention, sensitivity analysis is performed on the finite element model of the vehicle body based on sensitivity analysis objectives and sensitivity analysis constraints to determine the importance of each decoupling point. This includes: constructing a sensitivity analysis function based on the finite element model of the vehicle body and the sensitivity analysis objectives, wherein the variable of the sensitivity analysis function is the stiffness value of each decoupling point; performing sensitivity analysis based on the sensitivity analysis objectives, sensitivity analysis constraints, the sensitivity analysis function, and a preset range of stiffness values for each decoupling point to determine the degree of influence of stiffness changes at each decoupling point on the sensitivity analysis objectives; and determining the importance of each decoupling point based on the degree of influence of stiffness changes at each decoupling point on the sensitivity analysis objectives, wherein importance is positively correlated with the degree of influence.
[0043] Specifically, this embodiment uses sensitivity analysis to assess the importance of decoupling points and then arranges them. The basic concepts and mathematical definitions of this method are as follows: 1. Sensitivity analysis is used to quantify how sensitive a system's output (response) is to changes in input parameters (design variables). In optimization problems, design sensitivity is defined as the partial derivative of the response function with respect to the design variables, i.e., the gradient vector, and the theoretical formula is:
[0044] in, Design variables for sensitivity analysis, , For sensitivity analysis constraints, and To constrain the quantity, and usually .
[0045] The design sensitivity is reflected in the following: Gradient of objective function:
[0046] Constrained Jacobian matrix:
[0047]
[0048] 2. Implicit Function Theorem and Sensitivity Calculation When response From implicit equations When defining (e.g., in mechanical equilibrium equations), the implicit function theorem gives the sensitivity:
[0049] This formula is suitable for direct differentiation, but the computational cost varies with the number of variables. Linear growth.
[0050] 3. The efficiency of the adjoint method For large-scale design variables The adjoint method introduces adjoint variables. Reduce computational complexity to that of Irrelevant: Adjoint equation:
[0051] Sensitivity is calculated as follows:
[0052] Therefore, based on the above formula, no matter how large n is, it only requires a few calculations.
[0053] Based on the above fundamental theories, it can be deduced that to evaluate the importance of each decoupling point using sensitivity analysis and then arrange them accordingly, it is necessary to clarify the variables, responses, constraints, and objectives. The process of sensitivity analysis for the finite element model of the white vehicle in this embodiment is as follows: First, the Z-axis stiffness value of each decoupling point connecting the vehicle body and the frame is defined as a variable for sensitivity analysis, and the number of variables is denoted as . The variation range is ±50%. As the variables change, the frequencies of the torsional and bending modes of the white car finite element model also change. The frequencies of the first torsional mode and the first bending mode are defined as the two responses of the sensitivity analysis.
[0054] Then, based on the modal analysis results, the target for sensitivity analysis is to maximize the frequency of the first torsional mode, and the target for sensitivity analysis is to maximize the frequency of the first bending mode. As a constraint for sensitivity analysis, among which... The frequency of the first bending mode obtained from the above modal analysis process is denoted as .
[0055] Based on the above, the number of variables for the sensitivity analysis in this embodiment is determined to be: The number of targets and constraints in the sensitivity analysis is 1. Based on the fundamental theory of sensitivity analysis, the target-based sensitivity analysis function is established as follows:
[0056] Based on the adjoint method, the formula for calculating sensitivity is determined as follows:
[0057] Therefore, sensitivity analysis is performed on the finite element model of the white car according to the above formula to obtain the degree of influence of the stiffness change at each decoupling point on the sensitivity analysis target. The importance of each decoupling point is determined according to the degree of influence of the stiffness change at each decoupling point on the sensitivity analysis target. The greater the influence of the stiffness change at the decoupling point on the sensitivity analysis target, the higher the importance; conversely, the smaller the influence of the stiffness change at the decoupling point on the sensitivity analysis target, the lower the importance.
[0058] In one embodiment of the present invention, determining the final arrangement position of multiple decoupling points based on the importance of each decoupling point includes: determining a decoupling point arrangement diagram of the vehicle, wherein the decoupling point arrangement diagram corresponds to the finite element model of the vehicle and includes the initial position of each decoupling point; mapping the importance of each decoupling point to the corresponding decoupling point in the decoupling point arrangement scenario to obtain a target decoupling point arrangement diagram; performing image analysis on the target decoupling point arrangement diagram, and determining the final arrangement position of multiple decoupling points based on the image analysis results.
[0059] Specifically, in combination Figure 6 As shown, firstly, a corresponding decoupling point layout diagram is established based on the finite element model of the white car. This decoupling point layout diagram includes a partial connection diagram of the car body and the frame, and the initial position of each decoupling point is marked.
[0060] Multiple decoupling points are sorted in descending order of importance, with smaller ranking values indicating higher importance. These ranking values are then labeled at the corresponding decoupling points to map importance across the decoupling point placement scenario. Figure 6 The diagram shows the arrangement of the target decoupling points.
[0061] Image analysis is performed on the schematic diagram of the target decoupling point layout to obtain the density and importance of the decoupling points. Based on the image analysis results, the initial positions of the decoupling points are adjusted to obtain the final layout positions of multiple decoupling points. For example, if the number of high-importance decoupling points in a certain area is small, the number of decoupling points in that area is increased; if the number of low-importance decoupling points in a certain area is large, the number of decoupling points in that area is decreased; or the initial positions of the decoupling points are adjusted, and the importance of the corresponding decoupling points is adjusted by repositioning them, thereby improving their impact on the structural performance of the vehicle.
[0062] In one embodiment of the present invention, image analysis is performed on the schematic diagram of the target decoupling point arrangement, and the final arrangement positions of multiple decoupling points are determined based on the image analysis results. This includes: performing a traversal analysis on the schematic diagram of the target decoupling point arrangement based on a preset sliding window to obtain the number of decoupling points corresponding to each preset sliding window; and determining the final arrangement positions of multiple decoupling points based on the number of decoupling points corresponding to each preset sliding window and the importance of each decoupling point.
[0063] In other words, using a preset sliding window as the unit evaluation area, the arrangement of decoupling points within each preset sliding window is obtained by traversing the window, i.e., the number of decoupling points in each preset sliding window is obtained. This is then combined with the importance of the decoupling points to evaluate the distribution of decoupling points within each preset sliding window, thereby determining the final placement of multiple decoupling points based on the evaluation results. For example, if, based on the number of decoupling points corresponding to each preset sliding window and the importance of each decoupling point, it is determined that there are many decoupling points with an importance higher than a preset value within that preset sliding window, the number of decoupling points corresponding to that preset sliding window is increased; if it is determined that there are many decoupling points with an importance lower than a second preset value within that preset sliding window, the number of decoupling points corresponding to that preset sliding window is decreased; if it is determined that the deviation between the importance of multiple decoupling points within that preset sliding window is large, the distribution of decoupling points within the corresponding area of that preset sliding window is considered unreasonable, and the initial positions of multiple decoupling points are adjusted, moving decoupling points with lower importance to those with higher importance.
[0064] In one embodiment of the present invention, determining the final arrangement position of multiple decoupling points based on the decoupling point density corresponding to each preset sliding window and the importance of each decoupling point includes: when the number of first target decoupling points in the preset sliding window is greater than a first preset number, reducing the number of first target decoupling points in the preset sliding window to determine the final arrangement position of multiple decoupling points in the preset sliding window, wherein the importance of the first target decoupling point is lower than the first preset importance; when the number of second target decoupling points in the preset sliding window is greater than a second preset number, increasing the number of second target decoupling points in the preset sliding window to determine the final arrangement position of multiple decoupling points in the preset sliding window, wherein the importance of the second target decoupling point is higher than the second preset importance, and the second preset importance is higher than the first preset importance. The first preset number, second preset number, first preset importance, and second preset importance can be set according to actual conditions.
[0065] Specifically, when the importance of a decoupling point is lower than a first preset importance, the decoupling point is considered to have low importance and is designated as the first target decoupling point. When the importance of a decoupling point is higher than a second preset importance, the decoupling point is considered to have high importance and is designated as the second target decoupling point.
[0066] When the number of first target decoupling points in a preset sliding window is greater than the first preset number, it is considered that the decoupling points in the preset sliding window are generally less important, and the number of decoupling points corresponding to the preset sliding window can be reduced to make the decoupling points in the area more sparse.
[0067] When the number of second target decoupling points in the preset sliding window is greater than the second preset number, it is considered that the decoupling points in the preset sliding window are generally of high importance, and the number of decoupling points corresponding to the preset sliding window can be increased to make the decoupling points in the area more densely arranged.
[0068] As a specific embodiment of this application, such as Figure 7 As shown, the decoupling point arrangement method for this vehicle may include the following steps: S101, determine the finite element model of the vehicle body. The finite element model of the vehicle body includes multiple decoupling points for connecting the vehicle body and frame.
[0069] S102, perform free modal analysis on the finite element model of the white car to determine the first torsional mode and the first bending mode corresponding to the finite element model of the white car.
[0070] S103 uses the frequency of the first-order torque mode as the target parameter for sensitivity analysis.
[0071] S104, take maximizing the target parameter for sensitivity analysis as the sensitivity analysis target. Proceed to step S108.
[0072] S105 uses the frequency of the first bending mode as the constraint parameter for sensitivity analysis.
[0073] S106, obtain the difference between the frequency value of the first bending mode and the preset frequency value to obtain the target bending mode frequency value.
[0074] S107, the value of the sensitivity analysis constraint parameter is greater than or equal to the target bending modal frequency value as the sensitivity analysis constraint.
[0075] S108, based on the finite element model of the white car and the sensitivity analysis target, a sensitivity analysis function is constructed. The variable of the sensitivity analysis function is the stiffness value of each decoupling point.
[0076] S109. Sensitivity analysis is performed based on the sensitivity analysis target, sensitivity analysis constraints, sensitivity analysis function, and the preset variation range of stiffness value at each decoupling point, in order to determine the degree of influence of stiffness change at each decoupling point on the sensitivity analysis target.
[0077] In other words, the decoupling point of the rigid connection is transformed into an elastic connection, and the stiffness values of multiple sets of elastic connections are used as variables. The maximum torsional modal frequency of the body-in-white is taken as the objective, and the bending modal frequency of the body-in-white is used as a constraint, thereby performing sensitivity analysis. S110, the importance of each decoupling point is determined based on the degree of influence of the stiffness change of each decoupling point on the sensitivity analysis target, wherein the importance is positively correlated with the degree of influence.
[0078] S111, Determine the schematic diagram of the decoupling point layout for the vehicle.
[0079] S112, map the importance of each decoupling point to the corresponding decoupling point in the decoupling point layout scenario to obtain a schematic diagram of the target decoupling point layout.
[0080] S113, perform traversal analysis on the target decoupling point layout diagram based on a preset sliding window.
[0081] S114, obtain the number of the first target decoupling points and the number of the second target decoupling points in the preset sliding window.
[0082] S115, determine whether the number of the first target decoupling points in the preset sliding window is greater than the first preset number N1. If yes, proceed to step S116; otherwise, proceed to step S117.
[0083] S116, the first target decoupling point in the preset sliding window is deleted. Execute step S121.
[0084] S117, determine whether the number of the second target decoupling points is greater than the second preset number N2. If yes, proceed to step S118; otherwise, proceed to step S119.
[0085] S118, add the second target decoupling point in the preset sliding window.
[0086] S119, maintain the initial arrangement position of the decoupling points in the preset sliding window unchanged.
[0087] S120, determine whether the target decoupling point layout diagram has been traversed. If yes, proceed to step S121; otherwise, continue to step S113.
[0088] S121, determine the final arrangement of multiple decoupling points of the vehicle.
[0089] In summary, the vehicle decoupling point arrangement method according to embodiments of the present invention first determines the corresponding vehicle body finite element model, wherein the vehicle body finite element model includes multiple decoupling points for connecting the vehicle body and frame. Then, modal analysis is performed on the vehicle body finite element model to determine the sensitivity analysis target and sensitivity analysis constraints. Further, based on the sensitivity analysis target and sensitivity analysis constraints, sensitivity analysis is performed on the vehicle body finite element model to determine the importance of each decoupling point. Finally, the final arrangement positions of the multiple decoupling points are determined based on the importance of each decoupling point. Therefore, this method utilizes sensitivity analysis of the vehicle body finite element model to evaluate the importance of each decoupling point, thereby rationally arranging and planning the decoupling points based on their importance, ensuring the overall vehicle structural performance while controlling vehicle production costs.
[0090] Corresponding to the above embodiments, this application also proposes an electronic device.
[0091] Reference Figure 8 The electronic device 100 of this application embodiment includes: a memory 110, a processor 120, and a vehicle decoupling point arrangement program stored in the memory 110 and executable on the processor 120. When the processor 120 executes the vehicle decoupling point arrangement program, it implements the above-described vehicle decoupling point arrangement method.
[0092] According to the embodiments of this application, when the processor executes the vehicle decoupling point arrangement program, the above-mentioned vehicle decoupling point arrangement method is implemented. Based on the above-mentioned vehicle decoupling point arrangement method, the decoupling points of the vehicle are reasonably arranged and planned, so as to control the vehicle production cost while ensuring the overall vehicle structural performance.
[0093] Corresponding to the above embodiments, this application also proposes a computer-readable storage medium.
[0094] The computer-readable storage medium of this application embodiment stores a vehicle decoupling point layout program thereon, which, when executed by a processor, implements the above-described vehicle decoupling point layout method.
[0095] According to the computer-readable storage medium of the present application embodiment, when the vehicle decoupling point arrangement program is executed by the processor, the above-described vehicle decoupling point arrangement method is implemented. Based on the above-described vehicle decoupling point arrangement method, the decoupling points of the vehicle are reasonably arranged and planned, so as to control the vehicle production cost while ensuring the overall vehicle structural performance.
[0096] Corresponding to the above embodiments, this application also proposes a vehicle decoupling point arrangement device.
[0097] like Figure 9 As shown, the vehicle decoupling point arrangement device of this application embodiment may include: a determination module 10, a modal analysis module 20, a sensitivity analysis module 30, and a decoupling point arrangement module 40.
[0098] The system comprises the following modules: Module 10 determines the vehicle's white finite element model, which includes multiple decoupling points connecting the vehicle body and frame; Module 20 performs modal analysis on the white finite element model to determine sensitivity analysis objectives and constraints; Module 30 performs sensitivity analysis on the white finite element model based on the objectives and constraints to determine the importance of each decoupling point; and Module 40 determines the final placement of multiple decoupling points based on their importance.
[0099] According to one embodiment of the present invention, the modal analysis module 20 performs modal analysis on the finite element model of the white vehicle to determine the sensitivity analysis target and sensitivity analysis constraints. Specifically, it performs free modal analysis on the finite element model of the white vehicle to determine the first torsional mode and the first bending mode corresponding to the finite element model of the white vehicle; determines the sensitivity analysis target based on the first torsional mode; and determines the sensitivity analysis constraints based on the first bending mode.
[0100] According to one embodiment of the present invention, the modal analysis module 20 determines the sensitivity analysis target based on the first torsional mode, specifically by: using the frequency of the first torsional mode as the sensitivity analysis target parameter; maximizing the sensitivity analysis target parameter as the sensitivity analysis target; determining the sensitivity analysis constraint based on the first bending mode; using the frequency of the first bending mode as the sensitivity analysis constraint parameter; obtaining the difference between the frequency value of the first bending mode and a preset frequency value to obtain the target bending mode frequency value; and ensuring that the value of the sensitivity analysis constraint parameter is greater than or equal to the target bending mode frequency value as the sensitivity analysis constraint.
[0101] According to one embodiment of the present invention, the sensitivity analysis module 30 performs sensitivity analysis on the finite element model of the vehicle body based on the sensitivity analysis target and sensitivity analysis constraints to determine the importance of each decoupling point. Specifically, it is used to: construct a sensitivity analysis function based on the finite element model of the vehicle body and the sensitivity analysis target, wherein the variable of the sensitivity analysis function is the stiffness value of each decoupling point; perform sensitivity analysis based on the sensitivity analysis target, sensitivity analysis constraints, sensitivity analysis function, and a preset range of variation of the stiffness value of each decoupling point to determine the degree of influence of the stiffness change of each decoupling point on the sensitivity analysis target; and determine the importance of each decoupling point according to the degree of influence of the stiffness change of each decoupling point on the sensitivity analysis target, wherein the importance is positively correlated with the degree of influence.
[0102] According to one embodiment of the present invention, the decoupling point arrangement module 40 determines the final arrangement position of multiple decoupling points based on the importance of each decoupling point. Specifically, it is used to: determine a decoupling point arrangement diagram of the vehicle, wherein the decoupling point arrangement diagram corresponds to the finite element model of the white vehicle and includes the initial position of each decoupling point; map the importance of each decoupling point to the corresponding decoupling point in the decoupling point arrangement scene to obtain a target decoupling point arrangement diagram; perform image analysis on the target decoupling point arrangement diagram, and determine the final arrangement position of multiple decoupling points based on the image analysis results.
[0103] According to one embodiment of the present invention, the decoupling point arrangement module 40 performs image analysis on the target decoupling point arrangement schematic diagram and determines the final arrangement position of multiple decoupling points based on the image analysis results. Specifically, it performs traversal analysis on the target decoupling point arrangement schematic diagram based on a preset sliding window to obtain the number of decoupling points corresponding to each preset sliding window; and determines the final arrangement position of multiple decoupling points based on the number of decoupling points corresponding to each preset sliding window and the importance of each decoupling point.
[0104] According to one embodiment of the present invention, the decoupling point arrangement module 40 determines the final arrangement position of multiple decoupling points based on the decoupling point density corresponding to each preset sliding window and the importance of each decoupling point. Specifically, when the number of first target decoupling points in the preset sliding window is greater than a first preset number, the first target decoupling points in the preset sliding window are reduced to determine the final arrangement position of multiple decoupling points in the preset sliding window, wherein the importance of the first target decoupling point is lower than the first preset importance; when the number of second target decoupling points in the preset sliding window is greater than a second preset number, the second target decoupling points in the preset sliding window are increased to determine the final arrangement position of multiple decoupling points in the preset sliding window, wherein the importance of the second target decoupling point is higher than the second preset importance, and the second preset importance is higher than the first preset importance.
[0105] It should be noted that for details not disclosed in the vehicle decoupling point arrangement device of the embodiments of this application, please refer to the details disclosed in the vehicle decoupling point arrangement method of the above embodiments of this application, which will not be repeated here.
[0106] In summary, the vehicle decoupling point arrangement device according to an embodiment of the present invention determines the corresponding vehicle body finite element model through a determination module. The vehicle body finite element model includes multiple decoupling points connecting the vehicle body and frame. A modal analysis module performs modal analysis on the vehicle body finite element model to determine sensitivity analysis targets and constraints. A sensitivity analysis module performs sensitivity analysis on the vehicle body finite element model based on the sensitivity analysis targets and constraints to determine the importance of each decoupling point. Finally, a decoupling point arrangement module determines the final arrangement positions of the multiple decoupling points based on their importance. Therefore, this device utilizes sensitivity analysis of the vehicle body finite element model to evaluate the importance of each decoupling point, thereby rationally arranging and planning the decoupling points based on their importance, ensuring the overall vehicle structural performance while controlling vehicle production costs.
[0107] It should be noted that 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 specifically implemented 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, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.
[0108] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, 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.
[0109] In the description of this specification, 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 the invention. 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.
[0110] 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 invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0111] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0112] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A method for arranging decoupling points of a vehicle, characterized in that, The method includes: Determine the white car finite element model corresponding to the vehicle, wherein the white car finite element model includes multiple decoupling points for connecting the vehicle body and the frame; Modal analysis was performed on the finite element model of the white vehicle to determine the sensitivity analysis target and sensitivity analysis constraints; Sensitivity analysis is performed on the finite element model of the white vehicle based on the sensitivity analysis objectives and the sensitivity analysis constraints to determine the importance of each decoupling point. The final arrangement of the plurality of decoupling points is determined based on the importance of each decoupling point.
2. The decoupling point arrangement method according to claim 1, characterized in that, The modal analysis of the finite element model of the white vehicle to determine the sensitivity analysis target and sensitivity analysis constraints includes: Free modal analysis was performed on the finite element model of the white car to determine the first torsional mode and the first bending mode corresponding to the finite element model of the white car; The sensitivity analysis target is determined based on the first torsional mode; Sensitivity analysis constraints are determined based on the first bending mode.
3. The decoupling point arrangement method according to claim 2, characterized in that, The step of determining the sensitivity analysis target based on the first torsional mode includes: The frequency of the first-order torque mode is used as the target parameter for sensitivity analysis; The sensitivity analysis target is defined as maximizing the target parameter for the sensitivity analysis. The step of determining the sensitivity analysis constraints based on the first-order bending mode includes: The frequency of the first bending mode is used as the constraint parameter for sensitivity analysis; The difference between the frequency value of the first bending mode and the preset frequency value is obtained to obtain the target bending mode frequency value; The sensitivity analysis constraint parameter is defined as having a value greater than or equal to the target bending modal frequency value.
4. The decoupling point arrangement method according to claim 1, characterized in that, The sensitivity analysis of the finite element model of the white vehicle based on the sensitivity analysis objective and the sensitivity analysis constraints to determine the importance of each decoupling point includes: A sensitivity analysis function is constructed based on the finite element model of the white vehicle and the sensitivity analysis target, wherein the variable of the sensitivity analysis function is the stiffness value of each decoupling point; Sensitivity analysis is performed based on the sensitivity analysis target, the sensitivity analysis constraints, the sensitivity analysis function, and the preset variation range of the stiffness value of each decoupling point, in order to determine the degree of influence of the stiffness change of each decoupling point on the sensitivity analysis target. The importance of each decoupling point is determined based on the degree of influence of the stiffness change at each decoupling point on the sensitivity analysis target, wherein the importance is positively correlated with the degree of influence.
5. The decoupling point arrangement method according to claim 1, characterized in that, Determining the final arrangement position of the plurality of decoupling points based on the importance of each decoupling point includes: A schematic diagram of the decoupling point layout of the vehicle is determined, wherein the schematic diagram of the decoupling point layout corresponds to the finite element model of the white vehicle and includes the initial position of each decoupling point; Map the importance of each decoupling point to the corresponding decoupling point in the decoupling point layout scenario to obtain a schematic diagram of the target decoupling point layout. Image analysis is performed on the schematic diagram of the target decoupling point arrangement, and the final arrangement position of the multiple decoupling points is determined based on the image analysis results.
6. The decoupling point arrangement method according to claim 5, characterized in that, The step of performing image analysis on the schematic diagram of the target decoupling point arrangement, and determining the final arrangement position of the plurality of decoupling points based on the image analysis results, includes: The target decoupling point layout diagram is traversed and analyzed based on a preset sliding window to obtain the number of decoupling points corresponding to each preset sliding window; The final arrangement position of the multiple decoupling points is determined based on the number of decoupling points corresponding to each preset sliding window and the importance of each decoupling point.
7. The decoupling point arrangement method according to claim 6, characterized in that, The step of determining the final arrangement position of the plurality of decoupling points based on the decoupling point density corresponding to each preset sliding window and the importance of each decoupling point includes: If the number of first target decoupling points in a preset sliding window is greater than a first preset number, the number of first target decoupling points in the preset sliding window is reduced to determine the final arrangement position of multiple decoupling points in the preset sliding window, wherein the importance of the first target decoupling point is lower than the first preset importance. If the number of second target decoupling points in a preset sliding window is greater than a second preset number, the number of second target decoupling points in the preset sliding window is increased to determine the final arrangement position of multiple decoupling points in the preset sliding window. The importance of the second target decoupling point is higher than the second preset importance, which is higher than the first preset importance.
8. An electronic device, characterized in that, The system includes a memory, a processor, and a vehicle decoupling point layout program stored in the memory and executable on the processor. When the processor executes the vehicle decoupling point layout program, it implements the vehicle decoupling point layout method according to any one of claims 1-7.
9. A computer-readable storage medium, characterized in that, It stores a vehicle decoupling point layout program, which, when executed by a processor, implements the vehicle decoupling point layout method according to any one of claims 1-7.
10. A decoupling point arrangement device for a vehicle, characterized in that, include: The determination module is used to determine the white car finite element model corresponding to the vehicle, wherein the white car finite element model includes multiple decoupling points for connecting the vehicle body and the frame; The modal analysis module is used to perform modal analysis on the finite element model of the white vehicle to determine the sensitivity analysis target and sensitivity analysis constraints. The sensitivity analysis module is used to perform sensitivity analysis on the finite element model of the white vehicle based on the sensitivity analysis target and the sensitivity analysis constraints, so as to determine the importance of each decoupling point. The decoupling point layout module is used to determine the final layout position of the plurality of decoupling points according to the importance of each decoupling point.