A method to improve the simulation analysis accuracy of spring lower control arm

Abstract

The present invention discloses a method for improving the simulation analysis accuracy of a spring lower control arm, which belongs to the field of CAE simulation technology, including building a suspension system model; performing entity mesh division on the lower control arm, spring, and spring pad; importing the divided three-dimensional entity mesh into the built suspension system model; defining the assembly and contact relationship between the control arm and the suspension system; defining the equivalent stiffness, bushing preload, and material properties of the shock absorber channel; defining preliminary constraints; performing assembly simulation of the spring and the spring pad; performing compression simulation of the spring under the design state; checking the equilibrium state results; simulating the strength working condition; and post-processing and evaluating the results. The method can improve the calculation accuracy of the position of the lower control arm spring mating surface by improving the modeling method and simulation process near the hard point of the control arm spring, thereby more accurately judging its strength and durability performance.

Description

Technical Field

[0001] The invention belongs to the technical field of CAE simulation, and in particular relates to a method for improving the simulation analysis accuracy of a spring lower control arm. Background Art

[0002] Among the suspension components, the lower control arm equipped with spring / shock absorber is often used in E-type multi-link suspension system. Common structures include Figure 1 As shown, the control arm hard points include a lower control arm outer point 1, a shock absorber lower point 2, a spring lower point 3, a stabilizer link lower point 4 and a lower control arm inner point 5;

[0003] The analysis method for the lower control arm of the spring / shock absorber mostly uses single-piece analysis and establishes a suspension system model, as follows:

[0004] 1. Single-piece analysis is to first decompose the load in the multi-body dynamics software, and then use the inertia release algorithm to analyze in the finite element. Usually, RBE2, RBE3 or beam elements are established at 5 hard points, and the decomposed loads are added to the RBE2 master point, RBE3 slave point or the node of the beam element;

[0005] 2. To establish a suspension system model, import the control arm and the RBE2, RBE3 or beam units at the five hard points, and establish spring units such as Connector at the RBE2 main point, RBE3 slave point or the node of the beam unit to connect them to the system model.

[0006] The above two analysis methods generally use RBE3 unit connection near the lower point of the spring. The stress results calculated by this algorithm are somewhat different from the actual state of the parts and have low accuracy. Summary of the invention

[0007] In view of the problems that the positions near the hard points of the springs in the prior art are mostly connected by RBE3 units, which leads to a certain difference between the calculated stress results and the actual state of the parts and low accuracy, the present invention provides a method for improving the simulation analysis accuracy of a spring lower control arm. The method can improve the calculation accuracy of the position of the spring mating surface of the lower control arm by improving the modeling method and simulation process near the hard points of the control arm spring, thereby more accurately judging its strength and durability performance.

[0008] The present invention is achieved through the following technical solutions:

[0009] A method for improving the simulation analysis accuracy of a spring lower control arm comprises the following steps:

[0010] Step 1: Build a suspension system model;

[0011] Step 2: Perform solid meshing on the lower control arm, spring, and spring pad, where both the spring and spring pad use the geometric model in the free state;

[0012] Step 3: Import the divided 3D solid mesh into the suspension system model built in step 1;

[0013] Step 4: Define the assembly and contact relationship between the control arm and suspension system;

[0014] Step 5: Define the equivalent stiffness, bushing preload and material properties of the shock absorber channel;

[0015] Step 6: Define preliminary constraints: constrain the front and rear points of the subframe, the front point of the trailing arm, the upper point of the shock absorber, the upper point of the spring and the wheel center;

[0016] Step 7: Perform assembly simulation of the spring and spring pad, and observe whether the deformation and contact force of the results are reasonable. If not, return to check the model definition;

[0017] Step 8: Perform compression simulation of the spring under design conditions;

[0018] Step 9: Check the equilibrium state results;

[0019] Step 10: Strength working condition simulation;

[0020] Step 11: Post-process and evaluate the results, extract stress or strain for evaluation according to the working condition evaluation type.

[0021] Furthermore, the construction of the suspension system in step 1 is specifically constructed by beam units and connector units, or by spring units with six degrees of freedom stiffness;

[0022] The beam unit is used to simulate parts such as a subframe, a steering knuckle, and a control arm; the connector unit is used to simulate a rubber bushing, a ball joint or a ball pin, and a shock absorber.

[0023] Furthermore, step four is as follows:

[0024] (1) At the inner point of the lower control arm, the outer point of the lower control arm, the connection point of the stabilizer bar, and the lower point of the shock absorber, use RBE2, RBE3 or beam elements to couple the relevant nodes on the solid element at the control arm interface position, and then connect the RBE2 master point, RBE3 slave point, and beam element node to the connector element simulating the bushing;

[0025] (2) At the lower point of the spring, a real spring pad and spring model are used, and the contact relationship between the lower control arm and the spring channel is established. Finally, the RBE2 unit is used to couple the surface of the upper spring pad in contact with the vehicle body. At this time, the upper point of the spring is not the position of the upper point of the spring in the system, but the position of the spring in the free state.

[0026] Furthermore, the assembly relationship described in step four includes the connection between the outer point of the lower control arm and the steering knuckle, the connection between the inner point of the lower control arm and the subframe, the connection between the lower point of the lower control arm shock absorber and the shock absorber, the connection between the lower point of the lower control arm stabilizer bar and the stabilizer bar, and the connection between the lower control arm and the spring channel.

[0027] Furthermore, the contact relationship between the lower control arm and the spring channel specifically includes the contact between the surface of the lower control arm and the bottom surface of the lower spring pad, the contact between the lower end of the spring and the upper side of the lower spring pad, and the contact between the upper end of the spring and the lower side of the upper spring pad.

[0028] Furthermore, step five is as follows: the shock absorber channel is simulated using a connector unit, and the modified unit stiffness curve is determined by the buffer block stiffness curve, the shock absorber upper suspension stiffness curve, and the connection method between the two; at positions with bushing preload such as the front point of the subframe, the rear point of the subframe, and the front point of the longitudinal arm, the bushing stiffness curve is modified to simulate the preload; when defining the material properties of each component, all simplified beam units and spring entities can be assigned simple linear elastic material properties, the lower control arm is assigned linear elastic or elastoplastic material properties according to the strength evaluation requirements, and the spring pad needs to be assigned special material properties according to the characteristics of the material.

[0029] Furthermore, step eight is as follows: through separate calculation and analysis of the spring, measure the displacement of the upper point of the spring relative to the lower point in three translational directions and the angle of rotation in three rotational directions from the free state to the design state, set these 6 data as the displacement boundary conditions of the 6 degrees of freedom of the principal point of the RBE2 unit on the upper side of the upper spring pad, submit the calculation, and obtain the pre-compression of the spring and the system analysis results of the suspension under the design state.

[0030] Furthermore, step nine is as follows: check whether the calculation results of the shock absorber channel, spring channel, and bushing preload force are normal, whether the deformation of the spring channel is normal, whether the contact force of each contact surface is normal, whether the forces and moments in all directions of all bushings are normal; if the data is abnormal, return to check the model settings until all inspection items are normal.

[0031] Furthermore, step ten is as follows: release the wheel center constraint, apply strength condition load at the wheel center, and submit the calculation for strength simulation; after the calculation is completed, check the results, including deformation, channel and interface forces, and contact forces, and pay special attention to checking whether the distribution of vertical loads by the shock absorber channel and the spring channel is normal. If the result is abnormal, return to check the parameter settings.

[0032] Compared with the prior art, the advantages of the present invention are as follows:

[0033] The present invention provides a method for improving the simulation analysis accuracy of a spring lower control arm. The method can improve the calculation accuracy of the position of the spring mating surface of the lower control arm by improving the modeling method and simulation process near the hard point of the control arm spring, thereby more accurately judging its strength and durability performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0035] Figure 1 Schematic diagram of the lower control arm;

[0036] Figure 2 A schematic flow chart of a method for improving simulation analysis accuracy of a spring lower control arm according to the present invention;

[0037] Figure 3 Schematic diagram of the suspension system model.

[0038] Figure 4 Schematic diagram of modeling a spring channel.

[0039] In the figure: outer point 1 of the lower control arm, lower point 2 of the shock absorber, lower point 3 of the spring, lower point 4 of the stabilizer bar link, inner point 5 of the lower control arm. DETAILED DESCRIPTION

[0040] In order to clearly and completely describe the technical solution and its specific working process of the present invention, the specific implementation methods of the present invention are as follows in conjunction with the accompanying drawings of the specification:

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0044] A method for improving the simulation analysis accuracy of a spring lower control arm specifically comprises the following steps:

[0045] Step 1: Build a suspension system model;

[0046] Step 2: Perform solid meshing on the lower control arm, spring, and spring pad, where both the spring and spring pad use the geometric model in the free state;

[0047] Step 3: Import the divided 3D solid mesh into the suspension system model built in step 1;

[0048] Step 4: Define the assembly and contact relationship between the control arm and suspension system;

[0049] Step 5: Define the equivalent stiffness, bushing preload and material properties of the shock absorber channel;

[0050] Step 6: Define preliminary constraints: constrain the front and rear points of the subframe, the front point of the trailing arm, the upper point of the shock absorber, the upper point of the spring and the wheel center;

[0051] Step 7: Perform assembly simulation of the spring and spring pad, and observe whether the deformation and contact force of the results are reasonable. If not, return to check the model definition;

[0052] Step 8: Perform compression simulation of the spring under design conditions;

[0053] Step 9: Check the equilibrium state results;

[0054] Step 10: Strength working condition simulation;

[0055] Step 11: Post-process and evaluate the results, extract stress or strain for evaluation according to the working condition evaluation type.

[0056] Furthermore, the construction of the suspension system in step 1 is specifically constructed by beam units and connector units, or by spring units with six degrees of freedom stiffness;

[0057] The beam unit is used to simulate parts such as a subframe, a steering knuckle, and a control arm; the connector unit is used to simulate a rubber bushing, a ball joint or a ball pin, and a shock absorber.

[0058] Furthermore, step four is as follows:

[0059] (1) At the inner point of the lower control arm, the outer point of the lower control arm, the connection point of the stabilizer bar, and the lower point of the shock absorber, use RBE2, RBE3 or beam elements to couple the relevant nodes on the solid element at the control arm interface position, and then connect the RBE2 master point, RBE3 slave point, and beam element node to the connector element simulating the bushing;

[0060] (2) At the lower point of the spring, a real spring pad and spring model are used, and the contact relationship between the lower control arm and the spring channel is established. Finally, the RBE2 unit is used to couple the surface of the upper spring pad in contact with the vehicle body. At this time, the upper point of the spring is not the position of the upper point of the spring in the system, but the position of the spring in the free state.

[0061] Furthermore, the assembly relationship described in step four includes the connection between the outer point of the lower control arm and the steering knuckle, the connection between the inner point of the lower control arm and the subframe, the connection between the lower point of the lower control arm shock absorber and the shock absorber, the connection between the lower point of the lower control arm stabilizer bar and the stabilizer bar, and the connection between the lower control arm and the spring channel.

[0062] Furthermore, the contact relationship between the lower control arm and the spring channel specifically includes the contact between the surface of the lower control arm and the bottom surface of the lower spring pad, the contact between the lower end of the spring and the upper side of the lower spring pad, and the contact between the upper end of the spring and the lower side of the upper spring pad.

[0063] Furthermore, step five is as follows: the shock absorber channel is simulated using a connector unit, and the modified unit stiffness curve is determined by the buffer block stiffness curve, the shock absorber upper suspension stiffness curve, and the connection method between the two; at positions with bushing preload such as the front point of the subframe, the rear point of the subframe, and the front point of the longitudinal arm, the bushing stiffness curve is modified to simulate the preload; when defining the material properties of each component, all simplified beam units and spring entities can be assigned simple linear elastic material properties, the lower control arm is assigned linear elastic or elastoplastic material properties according to the strength evaluation requirements, and the spring pad needs to be assigned special material properties according to the characteristics of the material.

[0064] Furthermore, step eight is as follows: through separate calculation and analysis of the spring, measure the displacement of the upper point of the spring relative to the lower point in three translational directions and the angle of rotation in three rotational directions from the free state to the design state, set these 6 data as the displacement boundary conditions of the 6 degrees of freedom of the principal point of the RBE2 unit on the upper side of the upper spring pad, submit the calculation, and obtain the pre-compression of the spring and the system analysis results of the suspension under the design state.

[0065] Furthermore, step nine is as follows: check whether the calculation results of the shock absorber channel, spring channel, and bushing preload force are normal, whether the deformation of the spring channel is normal, whether the contact force of each contact surface is normal, whether the forces and moments in all directions of all bushings are normal; if the data is abnormal, return to check the model settings until all inspection items are normal.

[0066] Furthermore, step ten is as follows: release the wheel center constraint, apply strength condition load at the wheel center, and submit the calculation for strength simulation; after the calculation is completed, check the results, including deformation, channel and interface forces, and contact forces, and pay special attention to checking whether the distribution of vertical loads by the shock absorber channel and the spring channel is normal. If the result is abnormal, return to check the parameter settings.

[0067] Example 1

[0068] like Figure 2 FIG. 1 is a flow chart of a method for improving the simulation analysis accuracy of a spring lower control arm according to an embodiment of the present invention. The method specifically comprises the following steps:

[0069] Step 1: If Figure 3 As shown, a simplified suspension system is built using beam elements and connector elements or spring-type elements that can define the stiffness of 6 degrees of freedom;

[0070] Among them, the beam unit is used to simulate the subframe, steering knuckle, control arm and other parts, and the connector is used to simulate the rubber bushing, ball joint or ball pin, and shock absorber;

[0071] Step 2: Divide the solid mesh of the lower control arm, spring, and spring pad, where the spring and spring pad use the geometric model in the free state;

[0072] Step 3: Import the divided 3D solid mesh into the built simplified suspension system model;

[0073] Step 4: Define the assembly and contact relationship between the control arm and the suspension system. The connection relationship includes the connection between the outer point of the lower control arm and the steering knuckle, the connection between the inner point of the lower control arm and the subframe, the connection between the lower point of the lower control arm shock absorber and the shock absorber, the connection between the lower control arm stabilizer bar connection point and the stabilizer bar, and the connection between the lower control arm and the spring channel.

[0074] The specific operations are as follows: (1) At the inner point of the lower control arm, the outer point of the lower control arm, the connection point of the stabilizer bar, and the lower point of the shock absorber, use RBE2, RBE3, or beam elements to couple the relevant nodes on the solid element at the control arm interface position, and then connect the RBE2 master point, RBE3 slave point, and beam element node to the connector element simulating the bushing; (2) At the lower point of the spring, do not use the traditional RBE3 element, but use a real spring pad and spring model, and establish the contact relationship between the lower control arm and the spring channel, including the contact between the lower control arm surface and the bottom surface of the lower spring pad, the contact between the lower end of the spring and the upper side of the lower spring pad, and the contact between the upper end of the spring and the lower side of the upper spring pad. Finally, use the RBE2 element to couple the surface of the upper side of the upper spring pad with the contact surface of the vehicle body, such as Figure 4 As shown; at this time, the upper point of the spring is not the position of the upper point of the spring in the system, but the position of the spring in the free state.

[0075] Step 5: Define the equivalent stiffness, bushing preload, and material properties of the shock absorber channel;

[0076] The shock absorber channel is simulated using connector units, and the modified unit stiffness curve is determined by the buffer block stiffness curve, the shock absorber upper suspension stiffness curve, and the connection method between the two. At the locations with bushing preloads, such as the front point of the subframe, the rear point of the subframe, and the front point of the longitudinal arm, the bushing stiffness curve is modified to simulate the preload; when defining the material properties of each component, all simplified beam units and spring entities can be assigned simple linear elastic material properties, the lower control arm is assigned linear elastic or elastoplastic material properties according to the strength evaluation requirements, and the spring pad needs to be assigned special material properties according to the characteristics of the material;

[0077] Step 6: Define preliminary constraints: constrain the front and rear points of the subframe, the front point of the trailing arm, the upper point of the shock absorber, the upper point of the spring and the wheel center;

[0078] Step 7: Perform assembly simulation of the spring and spring pad, and observe whether the deformation and contact force of the results are reasonable. If not, return to check the model definition;

[0079] Step 8: Perform compression simulation of the spring under design status: First, through separate calculation and analysis of the spring, measure the displacement of the upper point of the spring relative to the lower point in three translational directions and the rotation angle in three rotational directions from the free state to the design state, set these six data as the displacement boundary conditions of the six degrees of freedom of the principal point of the RBE2 unit on the upper side of the upper spring pad, submit the calculation, and obtain the pre-compression of the spring under design status and the system analysis results of the suspension;

[0080] Step 9: Check the equilibrium state results: Check whether the calculation results of the shock absorber channel, spring channel, and bushing preload force are normal, whether the spring channel deformation is normal, whether the contact force of each contact surface is normal, and whether the forces and moments in all directions of all bushings are normal. If the data is abnormal, return to check the model settings until all the inspection items are normal;

[0081] Step 10: Strength working condition simulation: release the wheel center constraint, apply the strength working condition load at the wheel center, and submit the calculation for strength simulation; after the calculation is completed, check the results, including deformation, each channel and interface force, contact force, and pay special attention to check whether the distribution of vertical load by the shock absorber channel and spring channel is normal. If the result is abnormal, return to check the parameter settings;

[0082] Step 11: Post-process and evaluate the results, extract stress or strain for evaluation according to the working condition evaluation type.

[0083] Through the above steps, the process of improving the simulation analysis accuracy of the spring lower control arm is completed, and the calculation accuracy of the position of the spring mating surface of the lower control arm is improved, so as to more accurately judge its strength and durability performance.

[0084] The principle of the method for improving the simulation analysis accuracy of the spring lower control arm in this embodiment is as follows:

[0085] Stress calculation accuracy: The stress distribution under the spring pad is mainly affected by two factors: 1. The load of the spring channel; 2. The structural stiffness distribution near the spring pad in contact with the control arm. In this method, system modeling + shock absorber stiffness parameter correction + bushing preload stiffness parameter correction + spring assembly simulation and design compression preload simulation can more accurately obtain the load of the spring channel. The spring channel does not use simplified units, but uses solid meshes instead, which can avoid the problem that the commonly used RBE3 units cannot accurately describe the structural stiffness near the spring pad, thereby obtaining more accurate stress results. In one example, the stress difference between this algorithm and the traditional RBE3 inertia release algorithm is between 50Mpa and 150Mpa.

[0086] Fatigue life calculation accuracy: Fatigue damage is exponentially related to stress. A smaller stress change will cause a larger fatigue life change. Improving stress calculation accuracy means improving fatigue calculation accuracy.

[0087] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0088] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0089] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for improving the simulation analysis accuracy of a spring lower control arm, characterized in that: The specific steps include: Step 1: Build a suspension system model; Step 2: Perform solid meshing on the lower control arm, spring, and spring pad, where both the spring and spring pad use the geometric model in the free state; Step 3: Import the divided 3D solid mesh into the suspension system model built in step 1; Step 4: Define the assembly and contact relationship between the control arm and suspension system; Step 5: Define the equivalent stiffness, bushing preload and material properties of the shock absorber channel; Step 6: Define preliminary constraints: constrain the front and rear points of the subframe, the front point of the trailing arm, the upper point of the shock absorber, the upper point of the spring and the wheel center; Step 7: Perform assembly simulation of the spring and spring pad, and observe whether the deformation and contact force of the results are reasonable. If not, return to check the model definition; Step 8: Perform compression simulation of the spring under design conditions; Step 9: Check the equilibrium state results; Step 10: Strength working condition simulation; Step 11: Post-processing and evaluation of results: extract stress or strain for evaluation according to the working condition evaluation type; Step 4 is as follows: (1) At the inner point of the lower control arm, the outer point of the lower control arm, the connection point of the stabilizer bar, and the lower point of the shock absorber, use RBE2, RBE3 or beam elements to couple the relevant nodes on the solid element at the control arm interface position, and then connect the RBE2 master point, RBE3 slave point, and beam element node to the connector element simulating the bushing; (2) At the lower point of the spring, a real spring pad spring model is used, and the contact relationship between the lower control arm and the spring channel is established. Finally, the RBE2 unit is used to couple the surface of the upper spring pad in contact with the vehicle body. At this time, the upper point of the spring is not the position of the upper point of the spring in the system, but the position of the spring in the free state. Step five is as follows: the shock absorber channel is simulated using connector units, and the modified unit stiffness curve is determined by the buffer block stiffness curve, the shock absorber upper suspension stiffness curve, and the connection method between the two; the front point of the subframe, the rear point of the subframe, and the front point of the longitudinal arm have bushing preload positions, and the bushing stiffness curve is modified to simulate the preload; when defining the material properties of each component, all simplified beam units and spring entities are assigned simple linear elastic material properties, the lower control arm is assigned linear elastic or elastoplastic material properties according to the strength evaluation requirements, and the spring pad needs to be assigned material properties according to the characteristics of the material; Step eight is as follows: Through separate calculation and analysis of the spring, measure the displacement of the upper point of the spring relative to the lower point in three translational directions and the angle of rotation in three rotational directions from the free state to the design state, set these six data as the displacement boundary conditions of the six degrees of freedom of the principal point of the RBE2 unit on the upper side of the upper spring pad, submit the calculation, and obtain the pre-compression of the spring and the system analysis results of the suspension under the design state.

2. A method for improving the simulation analysis accuracy of a spring under control arm as claimed in claim 1, characterized in that: The suspension system model described in step 1 is specifically constructed by beam units and connector units, or by spring units with six degrees of freedom stiffness; The beam unit is used to simulate the subframe, steering knuckle, and control arm parts; the connector unit is used to simulate the rubber bushing, ball joint or ball pin, and shock absorber.

3. A method for improving the simulation analysis accuracy of a spring under control arm as claimed in claim 1, characterized in that: The assembly relationship described in step 4 includes the connection between the outer point of the lower control arm and the steering knuckle, the connection between the inner point of the lower control arm and the subframe, the connection between the lower point of the lower control arm shock absorber and the shock absorber, the connection between the lower point of the lower control arm stabilizer bar and the stabilizer bar, and the connection between the lower control arm and the spring channel.

4. The method for improving the simulation analysis accuracy of the spring under control arm according to claim 1, characterized in that: The contact relationship between the lower control arm and the spring channel specifically includes the contact between the surface of the lower control arm and the bottom surface of the lower spring pad, the contact between the lower end of the spring and the upper side of the lower spring pad, and the contact between the upper end of the spring and the lower side of the upper spring pad.

5. The method for improving the simulation analysis accuracy of a spring under control arm according to claim 1, characterized in that: Step nine is as follows: Check whether the calculation results of the shock absorber channel, spring channel, and bushing preload force are normal, whether the deformation of the spring channel is normal, whether the contact force of each contact surface is normal, and whether the forces and moments in all directions of all bushings are normal. If the data is abnormal, return to check the model settings until all inspection items are normal.

6. The method for improving the simulation analysis accuracy of a spring under control arm according to claim 1, characterized in that: Step 10 is as follows: release the wheel center constraint, apply strength load at the wheel center, and submit the calculation for strength simulation; After the calculation is completed, the results are checked, including deformation, channel and interface forces, contact forces, and whether the distribution of vertical loads by the shock absorber channel and spring channel is normal. If the results are abnormal, return to check the parameter settings.

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