Vehicle body and frame connection point determination method, terminal and computer storage medium

Abstract

The invention relates to a vehicle body and frame connection point determination method comprising the steps that a finite element simulation model of a frame is established, and the finite element simulation model comprises a vehicle body and frame connection point; performing connection point variable test design on the finite element simulation model to determine a plurality of groups of connection point design schemes of the finite element simulation model, and calculating corresponding torsional rigidity through the finite element simulation model; continuously adjusting the number of the connection points and carrying out connection point variable test design on the finite element simulation model again until the maximum value of the torsional rigidity output by the finite element simulation model meets a preset condition; and outputting the number and position of the connection points corresponding to the maximum value of the torsional rigidity. According to the method, the number and the positions of the connecting points of the vehicle body and the frame can be accurately and efficiently determined, the torsional rigidity of the whole vehicle is maximized, and lightweight design of the whole vehicle is facilitated.

Description

Technical Field

[0001] The present application belongs to the field of vehicle technology, and in particular, relates to a method for determining a connection point between a vehicle body and a vehicle frame, a terminal, and a computer storage medium. Background Art

[0002] Electric vehicles refer to vehicles that use on-board power as power, use motors to drive wheels, and meet the requirements of road traffic and safety regulations. Because their impact on the environment is relatively small compared to traditional vehicles, their prospects are widely optimistic. With the rapid development of new energy vehicles, electric vehicles have gradually penetrated into the daily lives of the general public and have become the first choice for many people's daily travel. However, the middle section of electric vehicles often carries a battery pack that accounts for a relatively high proportion of weight, resulting in electric vehicles requiring greater stiffness in the middle section of the frame than traditional non-load-bearing fuel vehicles. Under the above premise, for vehicles with decoupled upper and lower bodies, there are generally multiple connection points between the frame and the body in the middle section of the frame. Therefore, how to determine the number and position of the connection points to maximize the torsional stiffness of the entire vehicle is a more difficult problem. Summary of the invention

[0003] In response to the above technical problems, the present application provides a method, terminal and computer storage medium for determining the connection points between the vehicle body and the frame, which can accurately and efficiently determine the number and positions of the connection points between the vehicle body and the frame, maximize the torsional stiffness of the entire vehicle, and facilitate the lightweight design of the entire vehicle.

[0004] The present application provides a method for determining connection points between a vehicle body and a vehicle frame, comprising: establishing a finite element simulation model of the vehicle frame, wherein the finite element simulation model includes connection points between the vehicle frame and the vehicle body;

[0005] Performing a connection point variable test design on the finite element simulation model to determine multiple groups of connection point design schemes for the finite element simulation model, and calculating the corresponding torsional stiffness through the finite element simulation model;

[0006] Continuously adjusting the number of the connection points and performing connection point variable test design on the finite element simulation model again until the maximum value of the torsional stiffness output by the finite element simulation model meets a preset condition;

[0007] The number and position of connection points corresponding to the maximum value of the torsional stiffness that meets the preset condition are output.

[0008] In one embodiment, the step of establishing a finite element simulation model of the frame includes:

[0009] Import the three-dimensional structural model of the vehicle frame and perform mesh processing to obtain a mesh file;

[0010] Setting an initial connection point for the grid file;

[0011] Constraints and loads are added, and a finite element simulation model is generated according to the mesh file.

[0012] In one embodiment, adding constraints and loads includes:

[0013] A body attachment point dynamic stiffness is applied to the initial connection point.

[0014] In one embodiment, the performing experimental design on the finite element simulation model includes:

[0015] Taking the connection point as a variable and the torsional stiffness of the whole vehicle as a response, an expandable grid sequence method is adopted to perform connection point variable test design on the finite element simulation model.

[0016] In one embodiment, after performing a connection point variable test design on the finite element simulation model to determine multiple sets of connection point design schemes for the finite element simulation model and calculating the corresponding torsional stiffness through the finite element simulation model, the method further includes:

[0017] Draw the torsional stiffness change distribution curves of the multiple groups of connection point design schemes of the finite element simulation model.

[0018] In one embodiment, the preset condition is that the rate of change of the maximum value of the torsional stiffness is less than or equal to a preset threshold.

[0019] In one embodiment, the continuously adjusting the number of the connection points and performing connection point variable test design on the finite element simulation model again until the maximum value of the torsional stiffness output by the finite element simulation model meets a preset condition includes:

[0020] The number of the connection points is increased sequentially until the rate of change of the maximum value of the torsional stiffness output by the finite element simulation model is less than or equal to a preset threshold.

[0021] In one embodiment, the number of the connection points is greater than or equal to 4.

[0022] The present application also provides a terminal, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the above method when executing the computer program.

[0023] The present application also provides a computer storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0024] The present application provides a method, terminal and computer storage medium for determining the connection points between the vehicle body and the frame. The method includes establishing a finite element simulation model of the frame, wherein the finite element simulation model includes the connection points between the frame and the vehicle body; performing a connection point variable test design on the finite element simulation model to determine multiple sets of connection point design schemes for the finite element simulation model, and calculating the corresponding torsional stiffness through the finite element simulation model; continuously adjusting the number of connection points and performing a connection point variable test design on the finite element simulation model again until the maximum value of the torsional stiffness output by the finite element simulation model meets the preset conditions; and outputting the number and position of the connection points corresponding to the maximum value of the torsional stiffness. The present application can accurately and efficiently determine the number and position of the connection points between the vehicle body and the frame, maximize the torsional stiffness of the entire vehicle, and facilitate the lightweight design of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a flow chart of a method for determining a connection point between a vehicle body and a vehicle frame provided in an embodiment of the present application;

[0026] Figure 2 It is a structural schematic diagram of a three-dimensional structural model of a vehicle frame provided in an embodiment of the present application;

[0027] Figure 3 is a schematic diagram of a torsional stiffness change distribution curve provided in an embodiment of the present application;

[0028] Figure 4 It is a structural schematic diagram of a three-dimensional structural model of a vehicle frame provided in an embodiment of the present application;

[0029] Figure 5 is a schematic diagram of another torsional stiffness change distribution curve provided in an embodiment of the present application;

[0030] Figure 6 It is a schematic diagram of a specific process of a method for determining a connection point between a vehicle body and a vehicle frame provided in an embodiment of the present application;

[0031] Figure 7 It is a schematic diagram of the structure of the terminal provided in the embodiment of the present application. DETAILED DESCRIPTION

[0032] The technical solution of the present application is further elaborated in detail below in conjunction with the accompanying drawings and specific embodiments of the specification. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. "And / or" used herein includes any and all combinations of one or more related listed items.

[0033] Figure 1FIG. 1 is a flow chart of a method for determining the connection point between a vehicle body and a vehicle frame provided in the first embodiment of the present application. Figure 1 As shown, the method for determining the connection point between the vehicle body and the frame of the present application may include the following steps:

[0034] Step S210: establishing a finite element simulation model of the frame, wherein the finite element simulation model includes connection points between the frame and the vehicle body.

[0035] The method for determining the connection points between the vehicle body and the frame provided in this application can be applied to electric vehicles, especially vehicles with decoupled upper and lower bodies. When the frame is independently developed and designed, the number and position relationship of the connection points can be determined when the frame and the body of the electric vehicle are decoupled to meet the development needs of diversified models.

[0036] Optionally, a finite element simulation model of the frame is established, including:

[0037] Import the three-dimensional structural model of the vehicle frame and perform mesh processing to obtain a mesh file;

[0038] Set the initial connection point for the mesh file;

[0039] Add constraints and loads and generate a finite element simulation model based on the mesh file.

[0040] The present application first imports the three-dimensional structural model of the automobile frame into the finite element pre-processing software and performs mesh processing, sets the connection points between the frame and the body on the initial three-dimensional structural model of the frame, and then outputs the mesh file. Constraints and loads are added to the mesh file, and the body attachment point dynamic stiffness is applied to the connection points between the frame and the body to generate a finite element simulation model. The finite element simulation model is analyzed and calculated and the calculation file is output to obtain the torsional stiffness of the whole vehicle.

[0041] Figure 2 Schematic diagram of the three-dimensional structural model of the frame provided in the embodiment of the present application. Figure 2 As shown, four initial connection points are set on both sides of the middle beam of the frame. Specifically, the X-axis is parallel to the length direction of the middle beam, the Y-axis is parallel to the plane where the two middle beams are located and perpendicular to the X-axis, and the Z-axis is perpendicular to the plane where the two middle beams are located. The X-coordinates of the four frames on the left side of the frame and the body are selected as parameter variables x1, x2, x3, and x4, and the X-coordinates of the four frames on the right side of the frame and the body are configured as associated variables x11, x22, x33, and x44 corresponding to the above parameter variables, respectively, where x1 is associated with x11, x2 is associated with x22, x3 is associated with x33, and x4 is associated with x44, respectively, and the variation range of the X-coordinates of the connection points x1-x4 and x11-x44 on both sides is defined as ±200mm.

[0042] Among them, the constraints of the finite element simulation model can be the parameters of the left preset point of the rear beam, the right preset point of the rear beam, the middle preset point of the front beam, etc. The load applied to the frame can be the force on the left side of the front beam, the force on the right side of the front beam, etc. In addition, the dynamic stiffness of the body attachment point can be applied to the initial connection point. The dynamic stiffness is the ability to resist deformation under dynamic load, that is, the dynamic force required to cause unit amplitude. In this way, the interaction force between the body and the frame can be simulated when the frame and the body are in a decoupled state.

[0043] Step S220: performing a connection point variable test design on the finite element simulation model to determine multiple groups of connection point design schemes for the finite element simulation model, and calculating the corresponding torsional stiffness through the finite element simulation model.

[0044] Design of Experiment (DOE) is an experimental technique used to control process inputs in order to better understand the impact on process outputs. An experimental design is an experiment or a sequence of experiments in which variables that potentially affect the process are systematically changed according to the design matrix described. The main steps are to screen the main significant factors, find the best combination of production conditions, and prove that the best combination of production conditions is reproducible.

[0045] In one embodiment, a finite element simulation model is subjected to experimental design, including:

[0046] Taking the connection point as the variable and the torsional stiffness of the whole vehicle as the response, the Modified Extensible Lattice Sequence (MELS) method is used to carry out the connection point variable experiment design for the finite element simulation model.

[0047] Among them, based on the torsional stiffness of the whole vehicle as the response target, an expandable grid sequence method is used to perform experimental design with the position of the connection point as a parameter variable to determine the position of the connection point corresponding to the maximum torsional stiffness of the whole vehicle. Exemplarily, the X coordinates of the left frame and the body on the frame are used as independent variables, and the X coordinates of the right frame and the body on the frame are configured as corresponding associated variables. The range of the X coordinate is ±200mm front and back. Based on the maximum torsional stiffness of the whole vehicle as the response target, the DOE of the X coordinates of the connection points between the frame and the body is performed to determine the positions of at least four connection points.

[0048] Table 1 is a detailed list of connection point solutions (unit: mm). As shown in the following table, the optimization method of Modified Extensible Lattice Sequence is used to conduct experimental design on the finite element simulation model to obtain 17 different solutions. The data corresponding to connection point 1, connection point 2, connection point 3 and connection point 4 in Table 1 are the X coordinates of each connection point.

[0049] Table 1

[0050]

[0051] Optionally, after performing a connection point variable test design on the finite element simulation model to determine multiple sets of connection point design schemes for the finite element simulation model, and calculating the corresponding torsional stiffness through the finite element simulation model, the method further includes:

[0052] Draw the torsional stiffness change distribution curves of multiple sets of connection point design schemes of the finite element simulation model.

[0053] Among them, the 17 sets of connection point design schemes are shown in Table 1, and the trend changes of the 17 sets of scheme combinations are shown in Figure 3 . It can be seen that when 4 connection points are set on both sides of the frame, the response generated by the arrangement combination of scheme 12 is the best, and the optimal value is 33.5KN.MM / DEG. Then, the x-coordinates of connection points 1-4 of scheme 12 corresponding to the maximum torsional stiffness can be output, that is, the positions of the four connection points. In this way, the torsional stiffness change distribution curve can more clearly and intuitively display the torsional stiffness change trend between different connection point schemes, providing a better auxiliary analysis for the design of the connection points.

[0054] Step S230: Continue to adjust the number of connection points and perform connection point variable test design on the finite element simulation model again until the maximum value of the torsional stiffness output by the finite element simulation model meets the preset conditions.

[0055] In one embodiment, the preset condition is that the rate of change of the maximum value of the torsional stiffness is less than or equal to a preset threshold.

[0056] That is, the number of the connection points is continuously adjusted and the connection point variable test design is performed again on the finite element simulation model, and the iteration is performed until the rate of change of the maximum stiffness value is less than or equal to the preset threshold value.

[0057] Optionally, the number of connection points is continuously adjusted and the connection point variable test design is performed again on the finite element simulation model until the maximum value of the torsional stiffness output by the finite element simulation model meets a preset condition, including:

[0058] The number of connection points is increased sequentially until the rate of change of the maximum value of the torsional stiffness output by the finite element simulation model is less than or equal to a preset threshold.

[0059] Here, by increasing the number of vehicle body connection points and then repeating the connection point variable test design operation for the finite element simulation model, when the increase in the maximum torsional stiffness is less than a set threshold (such as 5%), the iteration is stopped and the number of connection points is determined.

[0060] like Figure 4As shown, the number of car bodies is increased to 5. That is, the connection points x1, x2, x3, x4, x5 on the left, and the connection points x11, x22, x33, x44, x55 on the right. The same scheme flow is adopted for operation, and there are 24 scheme combinations in total. The maximum stiffness combination and the distribution curve of the results are shown in Figure 5 , the maximum stiffness value is 34.7KN.MM / DEG. Compared with the four connection point solution (33.5KN.MM / DEG), the maximum stiffness value is increased by less than 5%, so the iteration is stopped.

[0061] Step S240: outputting the number and position of connection points corresponding to the maximum torsional stiffness that meets the preset conditions.

[0062] Among them, after stopping the iteration, it is determined that there are 5 connection points between the body and the frame, and the connection point distribution scheme adopted is scheme 12. The number of connection points and specific position parameters are output to complete the design of the connection points between the frame and the body.

[0063] like Figure 6 As shown, the method for determining the connection point between the vehicle body and the frame of the present application first inputs the model, that is, imports the three-dimensional structural model of the frame. Then, the three-dimensional structural model of the frame is meshed to obtain a mesh file. Then, the initial connection point is set for the mesh file, and constraints and loads are added. A finite element simulation model is generated according to the mesh file to perform finite element calculation. The task of finite element calculation is to complete relevant numerical calculations based on the finite element model and output the required calculation results. The calculation result output by the finite element simulation model here is the torsional stiffness of the whole vehicle. At the same time, the X-coordinate of the left body connection point on the frame is used as the independent variable, and the X-coordinate of the right body connection point on the frame is configured as the corresponding associated variable. Based on the maximum torsional stiffness of the whole vehicle as the response target, a DOE (Design of Experiment) of the X-coordinate of the connection point between the frame and the body is performed to determine the positions of at least four connection points corresponding to the maximum torsional stiffness value.

[0064] Next, the number of connection points is increased in sequence and the above operation is repeated. If the increase in torsional stiffness is greater than the set threshold (such as 5%), the connection points are continued to be increased and the calculation is iterated. When the increase in torsional stiffness is less than the set threshold (such as 5%), the iteration is stopped and the number and position relationship of the connection points are determined.

[0065] Thus, the method for determining the connection points between the vehicle body and the frame of the present application establishes a finite element simulation model of the frame, the finite element simulation model includes the connection points between the frame and the vehicle body; performs variable test design of the connection points on the finite element simulation model to determine multiple sets of connection point design schemes for the finite element simulation model, and calculates the corresponding torsional stiffness through the finite element simulation model; continuously adjusts the number of connection points and performs variable test design of the connection points on the finite element simulation model again until the maximum value of the torsional stiffness output by the finite element simulation model meets the preset conditions; outputs the number and position of the connection points corresponding to the maximum value of the torsional stiffness. Through the present application, the number and position of the connection points between the vehicle body and the frame can be accurately and efficiently determined, the torsional stiffness of the whole vehicle can be maximized, and the lightweight design of the whole vehicle can be achieved.

[0066] Figure 7 1 is a schematic diagram of the structure of the terminal provided in the embodiment of the present application. The terminal of the present application includes: a processor 110, a memory 111, and a computer program 112 stored in the memory 111 and executable on the processor 110. When the processor 110 executes the computer program 112, the steps in the embodiment of the method for determining the connection point between the vehicle body and the frame are implemented.

[0067] The terminal may include, but is not limited to, a processor 110 and a memory 111. Those skilled in the art will appreciate that Figure 7 It is only an example of a terminal and does not constitute a limitation on the terminal. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the terminal may also include input and output devices, network access devices, buses, etc.

[0068] The processor 110 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0069] The memory 111 may be an internal storage unit of the terminal, such as a hard disk or memory of the terminal. The memory 111 may also be an external storage device of the terminal, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital word (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the terminal. Further, the memory 111 may also include both an internal storage unit of the terminal and an external storage device. The memory 111 is used to store computer programs and other programs and data required by the terminal. The memory 111 may also be used to temporarily store data that has been output or is to be output.

[0070] The present application also provides a computer storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method for determining the connection point between the vehicle body and the frame are implemented.

[0071] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] In this document, the terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than those listed and may also include additional elements not expressly listed.

[0073] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for determining the connection point between a vehicle body and a vehicle frame, characterized in that: include: Establishing a finite element simulation model of the frame, wherein the finite element simulation model includes connection points between the frame and the body; Performing a connection point variable test design on the finite element simulation model to determine multiple groups of connection point design schemes for the finite element simulation model, and calculating the corresponding torsional stiffness through the finite element simulation model; Continuously adjusting the number of the connection points and performing connection point variable test design on the finite element simulation model again until the maximum value of the torsional stiffness output by the finite element simulation model meets a preset condition; The number and position of connection points corresponding to the maximum value of the torsional stiffness that meets the preset condition are output.

2. The method according to claim 1, characterized in that The finite element simulation model of the frame is established, comprising: Import the three-dimensional structural model of the vehicle frame and perform mesh processing to obtain a mesh file; Setting an initial connection point for the grid file; Constraints and loads are added, and a finite element simulation model is generated according to the mesh file.

3. The method according to claim 2, characterized in that The adding of constraints and loads includes: A body attachment point dynamic stiffness is applied to the initial connection point.

4. The method according to claim 1, characterized in that The experimental design of the finite element simulation model comprises: Taking the connection point as a variable and the torsional stiffness of the whole vehicle as a response, an expandable grid sequence method is adopted to perform connection point variable test design on the finite element simulation model.

5. The method according to claim 1, characterized in that After performing a connection point variable test design on the finite element simulation model to determine multiple sets of connection point design schemes for the finite element simulation model and calculating the corresponding torsional stiffness through the finite element simulation model, the method further includes: Draw the torsional stiffness change distribution curves of the multiple groups of connection point design schemes of the finite element simulation model.

6. The method according to claim 1, characterized in that The preset condition is that the rate of change of the maximum value of the torsional stiffness is less than or equal to a preset threshold.

7. The method according to claim 6, characterized in that The step of continuously adjusting the number of connection points and performing connection point variable test design on the finite element simulation model again until the maximum value of the torsional stiffness output by the finite element simulation model meets a preset condition includes: The number of the connection points is increased sequentially until the rate of change of the maximum value of the torsional stiffness output by the finite element simulation model is less than or equal to a preset threshold.

8. The method according to any one of claims 1 to 7, characterized in that: The number of the connection points is greater than or equal to 4.

9. A terminal, characterized in that: The terminal comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method according to any one of claims 1 to 8 when executing the computer program.

10. A computer storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

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