Method, device and equipment for improving simulation accuracy of lower control arm and storage medium

Abstract

The application provides a method, device, equipment and storage medium for improving simulation accuracy of a lower control arm. The method comprises the following steps: 1, importing a geometric model and dividing a grid; 2, establishing a Connector unit; 3, defining a direction of the Connector unit and correcting stiffness; 4, defining contact on the control arm; 5, restricting inner point and outer point degrees of freedom of the control arm; 6, defining different materials and properties according to an analysis working condition; 7, applying a decomposition load; 8, submitting finite element software analysis; 9, checking a result; 10, post-processing and evaluating the result. The application eliminates rigid body displacement through the restriction of the inner point and the outer point, thereby avoiding various restrictions caused by an inertia release algorithm; and through inner point and outer point bush stiffness correction and loading of all hard points, the application reduces load loss caused by bush stiffness to an acceptable range of accuracy, so that actual load of the control arm approaches the decomposition load, and the application can realize combined loading analysis of control arms in different spatial positions of multiple vehicle models in the same platform.

Description

Technical Field

[0001] This invention belongs to the field of CAE simulation technology, specifically a method, device, equipment, and storage medium for improving the CAE simulation accuracy of a spring-loaded control arm. Background Technology

[0002] See Figure 1 In suspension components, the lower control arm equipped with a spring / damper is commonly used in E-type multi-link suspension systems. The common structure is as follows: The hard points of the control arm include: lower control arm outer point 1, damper lower point 2, spring lower point 3, stabilizer bar link lower point 4, and lower control arm inner point 5.

[0003] The most common analysis method is to first decompose the load using multibody dynamics software, extracting the forces and moments (Fx, Fy, Fz, Mx, My, Mz) at five hard points for each working condition, and then perform analysis using the inertia release algorithm in the finite element method. Inertia release balances external forces through inertial forces (mass), allowing analysis of completely unconstrained models (closely approximating the actual state of the control arm).

[0004] However, the inertial release algorithm has limitations, such as its inability to analyze contact, and is typically used for the analysis of linear elastic materials. Figure 1 In the process, there are contact relationships between the upper and lower plates of the control arm, and between the inner point of the control arm and the outer tube of the bushing. If inertial release is used, it is impossible to simulate contact. The contact between the upper and lower plates will affect the local stress distribution in the vicinity, thus affecting the weld fatigue life assessment; the contact between the inner point and the outer tube of the bushing will affect the stress analysis results near the inner point.

[0005] Another common calculation method is to perform calculations using the suspension system. This analysis is unrestricted and can perform complex nonlinear simulations that consider contact and elastoplasticity. However, it requires the establishment of a complete system-level suspension model. Furthermore, the hard point locations and control arm attitudes differ for different vehicle models. Therefore, a suspension system usually needs to be established for each vehicle model, which involves a significant workload. Summary of the Invention

[0006] This invention provides a method, apparatus, device, and storage medium for improving the simulation accuracy of lower control arms. It eliminates rigid body displacement through constraints at inner and outer points without using an inertial release algorithm, thus avoiding the various limitations imposed by the inertial release algorithm. Furthermore, by correcting the bushing stiffness at inner and outer points and applying loads at all hard points, it reduces the loading loss caused by bushing stiffness to an acceptable range, thereby making the actual load on the control arm approach the decomposed load. Through load transformation in the characteristic coordinate system, it achieves combined loading analysis of control arms at different spatial positions in multiple vehicle models on the same platform, solving the aforementioned problems existing in current lower control arm simulations.

[0007] The technical solution of this invention is described below in conjunction with the accompanying drawings:

[0008] In a first aspect, embodiments of the present invention provide a method for improving the simulation accuracy of a lower control arm, comprising the following steps:

[0009] Step 1: Import the geometric model into the finite element preprocessing software and mesh it;

[0010] Step 2: Establish Connector units at the inner and outer points of the control arm;

[0011] Step 3: Define the orientation of the Connector element and adjust its stiffness;

[0012] Step 4: Define the contacts on the control arm;

[0013] Step 5: Constrain the six degrees of freedom of the Connector unit grounding terminals at the inner and outer points of the control arm;

[0014] Step 6: Define different materials and properties according to the analysis conditions; for conditions that require analysis of plastic strain, define elastoplastic material properties; for conditions that require analysis of linear elastic stress, define linear elastic material properties.

[0015] Step 7: Apply decomposed loads in six directions at all hard points;

[0016] Step 8: Submit the analysis using finite element software;

[0017] Step 9: Result check. The check items are deformation, interfacial force, and contact surface pressure. If the check results are abnormal, it means that there is an error in the model establishment / definition / constraint / loading. You need to go back to check, modify and resubmit the calculation until all check items are normal.

[0018] Step 10: Post-processing and evaluation of results.

[0019] Furthermore, the specific method for step one is as follows:

[0020] The geometric models of the lower control arm body, the inner point of the lower control arm, the outer point of the lower control arm, the lower point of the shock absorber, the lower point of the stabilizer rod, and the structure connected to the lower control arm are sequentially imported into the finite element preprocessing software and meshed. Among them, the structure connected to the lower control arm consists of bolts and steel sleeve / outer tube. The outer point of the lower control arm, the lower point of the shock absorber, the inner point of the lower control arm, the lower point of the stabilizer rod, and the outer wall of the steel sleeve / outer tube are connected using RBE3 elements. For the lower point of the spring, a semi-circular shape is cut out on the surface of the lower control arm where the spring is installed, based on the inner diameter D of the spring, the material diameter d, the contact start position of the spring under maximum pressure, and the termination angle Ф. The lower point of the spring and the semi-circular shape are connected using RBE3 elements.

[0021] Furthermore, the specific method for step two is as follows:

[0022] A Connector element is established at the inner point of the control arm, which is a spring-like element that can set nonlinear stiffness in 6 degrees of freedom. It consists of two completely overlapping nodes, one of which is the grounding end and the other is the hard point of the control arm.

[0023] A Connector element is established at the outer point of the control arm. This is a spring-like element that can set nonlinear stiffness in 6 degrees of freedom. It consists of two completely overlapping nodes, one of which is the grounding terminal and the other is the hard point of the control arm.

[0024] Furthermore, the specific method for step three is as follows:

[0025] The direction of the Connector element is defined according to the actual stiffness orientation of the bushing, and then the corrected bushing stiffness is assigned. The stiffness correction method is as follows: assuming the bushing stiffness curve in each direction is [Ki], the stiffness in the three translational degrees of freedom is corrected to one-hundredth of the original curve, i.e., [Ki] / 100, and the actual bushing stiffness [Ki] is set in the three rotational degrees of freedom.

[0026] Furthermore, the specific method for step four is as follows:

[0027] The definition includes the contact between the upper and lower plates of the control arm body, the contact between the control arm, bolts, and steel sleeve, and the contact between the control arm, bushing, and outer tube.

[0028] Furthermore, the specific method for step seven is as follows:

[0029] For working conditions that require analysis of plastic strain, after defining the elastic-plastic material / property definition, apply decomposed loads at the control arm hard point, spring connection point, damper connection point, and stabilizer bar connection point of the Connector unit at the inner and outer points of the control arm;

[0030] For operating conditions requiring linear elastic stress analysis, a combined analysis is performed. A characteristic coordinate system is defined on the lower control arm, the position of which is determined by the characteristics of the lower control arm itself. Then, the decomposed loads of all relevant vehicle models and operating conditions are transformed in spatial direction and applied under the characteristic coordinate system. The influence of different lower control arm positions and angles in each vehicle model is combined and analyzed to calculate the decomposed loads of all vehicle models and operating conditions in one operation. The analysis coordinate system of the five hard points is changed from the default global system to the characteristic coordinate system. For the inner and outer points of the lower control arm, the nodes at the hard point ends of the control arm need to be set.

[0031] Furthermore, the method for establishing the feature coordinate system is as follows: it is defined using the hard point and the bushing axis, with the outer point of the lower control arm as the origin, the line connecting the inner point of the lower control arm and the outer point of the lower control arm as the X-axis, and the positive direction of the bushing axis as the Z-axis.

[0032] Secondly, embodiments of the present invention also provide an apparatus for improving the simulation accuracy of a lower control arm, comprising:

[0033] The import module is used to import geometric models into finite element preprocessing software and generate meshes.

[0034] Establish a Connector unit module to create Connector units at the inner and outer points of the control arm;

[0035] The first definition module is used to define the orientation of the Connector unit and correct its stiffness;

[0036] The contact module is used to define the contacts on the control arm;

[0037] The constraint module is used to constrain the six degrees of freedom of the grounding terminals of the Connector units at the inner and outer points of the lower control arm;

[0038] The second definition module is used to define different materials and properties according to the analysis conditions; for conditions that require analysis of plastic strain, it defines elastoplastic material properties, and for conditions that require analysis of linear elastic stress, it defines linear elastic material properties.

[0039] The load application module is used to apply decomposed loads in six directions at all hard points;

[0040] The submission module is used to submit finite element software analyses;

[0041] The results checking module is used to check the results. The check items are deformation, interface force, and contact surface pressure. If the check results are abnormal, it means that there is an error in the model creation / definition / constraint / loading. You need to go back to check, modify and resubmit the calculation until all check items are normal.

[0042] The results post-processing and evaluation module is used to perform post-processing and evaluation of the results.

[0043] Thirdly, embodiments of the present invention also provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement a method for improving the simulation accuracy of a lower control arm as described in any of the embodiments of the present invention.

[0044] Fourthly, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for improving the simulation accuracy of a lower control arm as described in any of the embodiments of the present invention.

[0045] The beneficial effects of this invention are as follows:

[0046] 1) This invention improves the CAE simulation accuracy of the lower control arm.

[0047] 2) This invention is applicable to various working conditions, including elastoplastic strength analysis, linear elastic strength analysis, and fatigue life analysis.

[0048] 3) For linear elastic analysis conditions, this invention can perform combined analysis of multiple vehicle models, thereby improving efficiency. Attached Figure Description

[0049] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0050] Figure 1 This is a structural schematic diagram of a multi-link suspension system;

[0051] Figure 2 This is a flowchart of a method for improving the simulation accuracy of a lower control arm as described in this invention;

[0052] Figure 3 This is a schematic diagram of the structure of the device for improving the simulation accuracy of the lower control arm according to the present invention;

[0053] Figure 4 This is a schematic diagram of the structure of an electronic device. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0056] Example 1

[0057] Figure 2 This is a flowchart of a method for improving the simulation accuracy of a lower control arm according to Embodiment 1 of the present invention. This embodiment is applicable to situations requiring improved control arm simulation accuracy. The method can be executed by a device for improving the simulation accuracy of a lower control arm according to an embodiment of the present invention. This device can be implemented in software and / or hardware, such as... Figure 2 As shown.

[0058] A method for improving the simulation accuracy of a lower control arm includes the following steps:

[0059] Step 1: Import the geometric model into the finite element preprocessing software and mesh it;

[0060] The geometric models of the lower control arm body, the inner point of the lower control arm, the outer point of the lower control arm, the lower point of the shock absorber, the lower point of the stabilizer rod, and the structure connected to the lower control arm are sequentially imported into the finite element preprocessing software and meshed. Among them, the structure connected to the lower control arm consists of bolts and steel sleeve / outer tube. The outer point of the lower control arm, the lower point of the shock absorber, the inner point of the lower control arm, the lower point of the stabilizer rod, and the outer wall of the steel sleeve / outer tube are connected using RBE3 elements. For the lower point of the spring, a semi-circular shape is cut out on the surface of the lower control arm where the spring is installed, based on the inner diameter D of the spring, the material diameter d, the contact start position of the spring under maximum pressure, and the termination angle Ф. The lower point of the spring and the semi-circular shape are connected using RBE3 elements.

[0061] Step 2: Establish Connector units at the inner and outer points of the control arm;

[0062] A Connector element is established at the inner point of the control arm, which is a spring-like element that can set nonlinear stiffness in 6 degrees of freedom. It consists of two completely overlapping nodes, one of which is the grounding end and the other is the hard point of the control arm.

[0063] A Connector element is established at the outer point of the control arm. This is a spring-like element that can set nonlinear stiffness in 6 degrees of freedom. It consists of two completely overlapping nodes, one of which is the grounding terminal and the other is the hard point of the control arm.

[0064] Step 3: Define the orientation of the Connector element and adjust its stiffness;

[0065] The direction of the Connector element is defined based on the actual stiffness orientation of the bushing, and then the corrected bushing stiffness is assigned. The stiffness correction method is as follows: assuming the bushing stiffness curve in each direction is [Ki], the stiffness in the three translational degrees of freedom is corrected to one-hundredth of the original curve, i.e., [Ki] / 100, and the actual bushing stiffness [Ki] is set in the three rotational degrees of freedom. This can avoid the control arm from "drifting" in space and also avoid large load loss caused by the bushing in the main force transmission direction after constraint loading, thereby avoiding the calculated stress or strain near the inner and outer points being too small.

[0066] This invention reduces the load loss caused by bushing stiffness to an acceptable range by correcting the stiffness of the inner and outer bushings and by applying load to all hard points, thereby making the actual load on the control arm closer to the decomposed load.

[0067] Step 4: Define the contacts on the control arm;

[0068] The definition includes the contact between the upper and lower plates of the control arm body, the contact between the control arm, bolts, and steel sleeve near the hard point, and the contact between the control arm, bushing, and outer tube.

[0069] Step 5: Constrain the six degrees of freedom of the Connector unit grounding terminals at the inner and outer points of the control arm;

[0070] By establishing the Connector unit, the A-end (grounding end) of the inner and outer Connector units is constrained, and the degrees of freedom 1, 2, 3, 4, 5, and 6 are adjusted. This reduces the load loss on the bushing and improves the simulation accuracy.

[0071] This invention eliminates rigid body displacement by constraining internal and external points, thereby avoiding various limitations brought about by the inertia release algorithm.

[0072] Step 6: Define different materials and properties according to the analysis conditions; for conditions that require analysis of plastic strain (usually misuse or limit conditions), define elastoplastic material properties; for conditions that require analysis of linear elastic stress (usually ordinary strength conditions and fatigue life conditions), define linear elastic material properties.

[0073] Step 7: Apply decomposed loads in six directions at all hard points;

[0074] For working conditions that require analysis of plastic strain, after defining the elastic-plastic material / property definition, apply decomposed loads at the control arm hard point, spring connection point, damper connection point, and stabilizer bar connection point of the Connector unit at the inner and outer points of the control arm;

[0075] For working conditions requiring linear elastic stress analysis, a combined analysis is performed. A characteristic coordinate system is defined on the lower control arm, the position of which is determined by the characteristics of the lower control arm itself. Then, the decomposed loads of all relevant vehicle models and working conditions are transformed in spatial direction and applied under the characteristic coordinate system. This allows for combined analysis regardless of the different lower control arm positions and angles in each vehicle model, calculating the decomposed loads for all vehicle models and working conditions in one go. The analysis coordinate system of the five hard points is changed from the default global system to the characteristic coordinate system. For the inner and outer points of the lower control arm, the nodes at the hard point ends of the control arm need to be set.

[0076] The method for establishing the feature coordinate system is as follows: it is defined using the hard point and bushing axis, with the outer point of the lower control arm as the origin, the line connecting the inner point of the lower control arm and the outer point of the lower control arm as the X-axis, and the positive direction of the bushing axis as the Z-axis.

[0077] By defining a characteristic coordinate system, performing spatial transformation of the load, and setting a hard point analysis coordinate system, the combined calculation of different vehicle models can be achieved.

[0078] Step 8: Submit the analysis using finite element software;

[0079] Step 9: Result check. The check items are deformation, interfacial force, and contact surface pressure. If the check results are abnormal, it means that there is an error in the model establishment / definition / constraint / loading. You need to go back to check, modify and resubmit the calculation until all check items are normal.

[0080] Step 10: Post-processing and evaluation of results.

[0081] Perform routine post-processing and evaluation based on the results of step nine.

[0082] Example 2

[0083] See Figure 3 A device for improving the simulation accuracy of a lower control arm, comprising:

[0084] The import module is used to import geometric models into finite element preprocessing software and generate meshes.

[0085] Establish a Connector unit module to create Connector units at the inner and outer points of the control arm;

[0086] The first definition module is used to define the orientation of the Connector unit and correct its stiffness;

[0087] The contact module is used to define the contacts on the control arm;

[0088] The constraint module is used to constrain the six degrees of freedom of the grounding terminals of the Connector units at the inner and outer points of the lower control arm;

[0089] The second definition module is used to define different materials and properties according to the analysis conditions; for conditions that require analysis of plastic strain, it defines elastoplastic material properties, and for conditions that require analysis of linear elastic stress, it defines linear elastic material properties.

[0090] The load application module is used to apply decomposed loads in six directions at all hard points;

[0091] The submission module is used to submit finite element software analyses;

[0092] The results checking module is used to check the results. The check items are deformation, interface force, and contact surface pressure. If the check results are abnormal, it means that there is an error in the model creation / definition / constraint / loading. You need to go back to check, modify and resubmit the calculation until all check items are normal.

[0093] The results post-processing and evaluation module is used to perform post-processing and evaluation of the results.

[0094] Example 3

[0095] Figure 4 This is a schematic diagram of the structure of a computer device according to Embodiment 3 of the present invention. Figure 4 A block diagram of an exemplary computer device 102 suitable for implementing embodiments of the present invention is shown. Figure 4 The computer device 102 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of the present invention.

[0096] like Figure 4 As shown, the computer device 102 is presented in the form of a general-purpose computing device. The components of the computer device 102 may include, but are not limited to: one or more processors or processing units 16, system memory 28, and a bus 18 connecting different system components (including system memory 28 and processing unit 16).

[0097] Bus 18 represents one or more of several bus architectures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of the various bus architectures. For example, these architectures include, but are not limited to, the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MAC) bus, the Enhanced ISA bus, the Video Electronics Standards Association (VESA) local bus, and the Peripheral Component Interconnect (PCI) bus.

[0098] Computer device 102 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by computer device 102, including volatile and non-volatile media, removable and non-removable media.

[0099] System memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and / or cache memory 32. Computer device 102 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, storage system 34 may be used to read and write non-removable, non-volatile magnetic media (…). Figure 4 Not shown; usually referred to as a "hard drive"). Although Figure 4 Not shown, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk") and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 18 via one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of the embodiments of the present invention.

[0100] A program / utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28. Such program modules 42 include—but are not limited to—an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include an implementation of a network environment. Program modules 42 typically perform the functions and / or methods described in the embodiments of the present invention.

[0101] The computer device 102 can also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), and with one or more devices that enable a user to interact with the computer device 102, and / or with any device that enables the computer device 102 to communicate with one or more other computing devices (e.g., network card, modem, etc.). This communication can be performed via the input / output (I / O) interface 22. Furthermore, in this embodiment, the display 24 of the computer device 102 is not an independent entity, but is embedded in a mirror, so that when the display surface of the display 24 is not displayed, the display surface of the display 24 and the mirror surface visually blend together. Additionally, the computer device 102 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via the network adapter 20. As shown, the network adapter 20 communicates with other modules of the computer device 102 via the bus 18. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with computer device 102, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0102] The processing unit 16 executes various functional applications and data processing by running programs stored in the system memory 28, such as implementing a method for improving the simulation accuracy of a lower control arm provided in an embodiment of the present invention.

[0103] Example 4

[0104] Embodiment 4 of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for improving the simulation accuracy of a lower control arm as provided in all embodiments of the present application.

[0105] Any combination of one or more computer-readable media may be used. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.

[0106] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including—but not limited to—electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of transmitting, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0107] The program code contained on a computer-readable medium may be transmitted using any suitable medium, including—but not limited to—wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0108] Computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0109] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for improving simulation accuracy of a lower control arm, characterized by, The method comprises the following steps: Step 1: importing a geometric model into a finite element pre-processing software and dividing a grid; Step 2: establishing a Connector unit at an inner point of the control arm and an outer point of the control arm; Step 3: defining a direction of the Connector unit and correcting a stiffness; Step 4: defining a contact on the control arm; Step 5: restricting six degrees of freedom of a ground end of the Connector unit at the inner point and the outer point of the control arm; Step 6: defining different materials and properties according to analysis conditions; for a condition requiring analysis of plastic strain, defining an elastic-plastic material property, and for a condition requiring analysis of linear elastic stress, defining a linear elastic material property; Step 7: applying a decomposed load in six directions on all hard points; Step 8: submitting the finite element software for analysis; Step 9: checking a result, and checking items are deformation, interface force and contact surface pressure; if the checking result is abnormal, it indicates that model establishment, definition, restriction and loading are wrong, and the calculation needs to be returned for checking and modified and then submitted for calculation again until all the checking items are normal; Step 10: post-processing and evaluation of the result; The specific method of the step 1 is as follows: geometric models of the lower control arm body, the lower control arm inner point, the lower control arm outer point, the shock absorber lower point, the stabilizer bar connecting rod lower point and a structure connected with the lower control arm are imported into the finite element pre-processing software in sequence and are divided into grids for grid division; wherein the structure connected with the lower control arm is a bolt and a steel sleeve / bush outer tube, and RBE3 units are used to connect the lower control arm outer point, the shock absorber lower point, the lower control arm inner point, the stabilizer bar connecting rod lower point and the steel sleeve outer wall / bush outer tube inner wall; for the spring lower point, according to a spring inner diameter D, a material diameter d, a contact starting position of the spring under maximum pressure and a terminal angle Ф, a semi-annular shape is cut out from a surface of the lower control arm on which the spring is installed, and RBE3 units are used to connect the spring lower point and the semi-annular shape; The specific method of the step 2 is as follows: a Connector unit, which is a spring type unit capable of setting non-linear stiffness in six degrees of freedom, is established at the control arm inner point and is composed of two completely coincident nodes, one of which is a ground end and the other is a control arm hard point; a Connector unit, which is a spring type unit capable of setting non-linear stiffness in six degrees of freedom, is established at the control arm outer point and is composed of two completely coincident nodes, one of which is a ground end and the other is a control arm hard point; The specific method of the step 3 is as follows: a direction of the Connector unit is defined according to an actual stiffness orientation of the bushing, and then a corrected bushing stiffness is given; the stiffness correction method is that: assuming that a bushing stiffness curve in a direction of the bushing is [Ki], the stiffness in three directions of translation freedom is corrected to one hundredth of the original curve, i.e. [Ki] / 100, and the stiffness in three directions of rotation freedom is set to the actual stiffness [Ki] of the bushing; The specific method of the step 4 is as follows: contacts including a contact between upper and lower plates of the control arm body, a contact between the control arm, the bolt and the steel sleeve and a contact between the control arm and the bushing outer tube are defined; The specific method of the step 7 is as follows: For the working condition that needs to analyze plastic strain, after defining the elastic-plastic material / attribute, the decomposed load is applied at the hard points of the control arm, the spring connecting points, the shock absorber connecting points and the stabilizer connecting points of the Connector unit in the inner point and the outer point of the control arm; For the working condition that needs to analyze linear elastic stress, the combined analysis is carried out, a characteristic coordinate system is defined on the lower control arm, the position of the characteristic coordinate system is determined by the characteristics of the lower control arm itself, then the decomposed loads of all related working conditions of the related vehicle models are subjected to spatial direction transformation and are loaded in the characteristic coordinate system, the influences of different positions and angles of the lower control arms in various vehicle models are combined and analyzed, and the decomposed loads of all vehicle models and working conditions are calculated at one time; the analysis coordinate systems of the five hard points are changed from the default whole system to the characteristic coordinate system, and for the inner point and the outer point of the lower control arm, the nodes at the hard point ends of the control arm need to be set; The establishment method of the characteristic coordinate system is that the hard points and the bushing axial directions are used for definition, the outer point of the lower control arm is used as the origin, the connecting line between the inner point and the outer point of the lower control arm is used as the X axis, and the positive direction of the axial direction of the outer point bushing is used as the Z axis for definition.

2. A device for improving the simulation accuracy of a lower control arm, for implementing the method for improving the simulation accuracy of a lower control arm as claimed in claim 1, characterized in that, The method comprises the following steps: a module for importing a geometric model into a finite element pre-processing software and dividing a mesh; a module for establishing a Connector unit at the inner point and the outer point of the control arm; a first definition module for defining the direction of the Connector unit and correcting the stiffness; a contact module for defining the contact on the control arm; a constraint module for constraining the six degrees of freedom of the ground end of the Connector unit at the inner point and the outer point of the lower control arm; a second definition module for defining different materials and attributes according to the analysis working condition; for the working condition that needs to analyze plastic strain, the elastic-plastic material attribute is defined, and for the working condition that needs to analyze linear elastic stress, the linear elastic material attribute is defined; a load application module for applying the decomposed load in six directions on all the hard points; a submission module for submitting the finite element software analysis; a result checking module for result checking, and the checking items are deformation, interface force and contact surface pressure; if the checking result is not normal, it indicates that the model establishment / definition / constraint / loading is wrong, the checking needs to be returned, the modification is re-submitted for calculation until all the checking items are normal; a result post-processing and evaluation module for post-processing and evaluation of the result.

3. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to realize the method for improving the simulation precision of the lower control arm according to claim 1.

4. A computer-readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to realize the method for improving the simulation precision of the lower control arm according to claim 1.

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