Finite element analysis method for spring pad

Abstract

The present application relates to a kind of finite element analysis methods of spring pad, which is: the grid model of first plastic piece, first rubber, glue, second rubber and second plastic piece of spring pad is divided as first type model;The grid model of spring, corresponding virtual glue, corresponding virtual second rubber of glue of spring pad is divided as second type model;Static implicit analysis step is created to analyze second type model;Dynamic explicit analysis step is created and the analysis result of first type model is analyzed in combination with static implicit analysis step;Finally remove virtual glue and virtual second rubber.First plastic piece, first rubber, glue, second rubber, second plastic piece, spring, virtual glue, virtual second rubber are all reduced integration element.The shape of reduced integration element is hexahedron.The present application can carry out efficient, accurate finite element analysis to spring pad.

Description

Technical Field

[0001] This invention relates to the field of modeling and analysis technology, and specifically to a finite element analysis method for spring pads in automotive suspension systems. Background Technology

[0002] Spring pads are crucial damping and noise reduction components in automotive suspension systems, and their structure directly impacts the system's performance. Finite element analysis (FEM) can obtain stress and strain results for each component of the spring pad, providing guidance and reference for optimized spring pad design, reducing product development cycles, and enhancing product competitiveness. However, current technologies do not apply FEM to spring pad development. Summary of the Invention

[0003] The purpose of this invention is to provide a finite element analysis method for spring pads that can reduce product development cycles and improve product competitiveness.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A finite element analysis method for a spring pad is disclosed. The method comprises: dividing the spring pad into mesh models of a first plastic component, a first rubber component, an adhesive component, a second rubber component, and a second plastic component as a first type of model; dividing the spring of the spring pad, a virtual adhesive component corresponding to the adhesive component, and a virtual second rubber component corresponding to the second rubber component as a second type of model; creating a static implicit analysis step to analyze the second type of model; creating a dynamic explicit analysis step and combining the analysis results of the static implicit analysis step to analyze the first type of model; and finally removing the virtual adhesive component and the virtual second rubber component.

[0005] The first plastic part, the first rubber, the glue, the second rubber, the second plastic part, the spring, the virtual glue, and the virtual second rubber are all reduced integral units.

[0006] The shape of the reduced integral unit is hexahedral.

[0007] The grid of the virtual glue surface is consistent with the grid of the glue surface, and the grid of the virtual second rubber surface is consistent with the grid of the second rubber surface.

[0008] The grid on the surface of the adhesive and the grid on the surface of the first rubber correspond one-to-one at the nodes of the contact area between the adhesive and the first rubber and are connected.

[0009] The virtual adhesive and the spring, and the virtual second rubber and the spring, are in contact-to-contact relationships.

[0010] In the static implicit analysis step, the virtual glue and the virtual second rubber respectively compress the spring. When the length of the spring is less than the distance between the glue and the second rubber, the static implicit analysis step stops.

[0011] In the dynamic explicit analysis step, the virtual glue, the virtual second rubber, and the compressed spring are imported after being solved in the static implicit analysis step.

[0012] In the explicit dynamic analysis step, the virtual glue and the virtual second rubber release the spring respectively. When the spring is in complete contact with the glue and the second rubber, the explicit dynamic analysis step stops.

[0013] Due to the application of the above technical solutions, the present invention has the following advantages compared with the prior art: the present invention can perform efficient and accurate finite element analysis on spring pads. Attached Figure Description

[0014] Appendix Figure 1 This is a schematic diagram of the overall structure of the model used in this invention.

[0015] Appendix Figure 2 This is a model diagram of the static implicit analysis step in this invention.

[0016] Appendix Figure 3 This is a model diagram of the explicit dynamic analysis step in this invention.

[0017] Appendix Figure 4 The model diagram for the dynamic explicit analysis step after importing the analysis results of the static implicit analysis step.

[0018] Appendix Figure 5 This is a partial schematic diagram of the lower spring pad in the explicit dynamic analysis step of the present invention.

[0019] Appendix Figure 6 This is a partial cross-sectional view of the spring pad in the explicit dynamic analysis step of the present invention. Detailed Implementation

[0020] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0021] Example 1: As shown in the attached document Figure 1 To be continued Figure 6 As shown, the spring pad includes an upper pad disposed at the upper end of the spring 2 and a lower pad disposed at the lower end of the spring 2. The lower pad includes a first plastic part 4 and a first rubber 3. The lower pad is connected to the spring 2 by glue 7. The upper pad includes a second plastic part 8 and a second rubber 1.

[0022] The finite element analysis method for the above-mentioned spring pad is as follows: First, the mesh models of the first plastic part 4, the first rubber 3, the glue 7, the second rubber 1, and the second plastic part 8 of the spring pad are divided into two types of models: the mesh models of the spring 2, the virtual glue 6 corresponding to glue 7, and the virtual second rubber 5 corresponding to second rubber 1 are divided into two types of models; a static implicit analysis step is created to analyze the second type of model; a dynamic explicit analysis step is created and the analysis results of the static implicit analysis step are combined to analyze the first type of model; finally, the virtual glue 6 and the virtual second rubber 5 are removed.

[0023] The first plastic part 4, the first rubber 3, the glue 7, the second rubber 1, the second plastic part 8, the spring 2, the virtual glue 6, and the virtual second rubber 5 are all reduced integration units, and the shape of the reduced integration unit is hexahedral. Its advantages are: when spring 2 is compressed and assembled into the spring pad, it causes a large strain in the spring pad, and there are complex contact relationships between the various components of the spring pad and between the spring pad and spring 2. Reduced integration units are suitable for large strains and complex contacts. Furthermore, reduced integration units result in fewer integration points and faster calculation speed.

[0024] The mesh on the surface of virtual glue 6 is consistent with the mesh on the surface of glue 7, and the mesh on the surface of virtual second rubber 5 is consistent with the mesh on the surface of second rubber 1. The beneficial effect is that the mesh models of virtual glue 6 and virtual second rubber 5 can be directly copied and generated, eliminating the need for modeling work and improving modeling efficiency. The fact that the meshes of virtual glue 6 and virtual second rubber 5 are consistent with those of glue 7 and second rubber 1 respectively ensures the stable establishment of contact between spring 2 and glue 7 and second rubber 1 during explicit dynamic analysis.

[0025] The mesh on the surface of adhesive 7 corresponds one-to-one with the mesh on the surface of the first rubber 3 at the contact area between the adhesive 7 and the first rubber 3, and the meshes are connected accordingly. The advantage of this is that by using a one-to-one node correspondence connection, the use of TIE (Telematics Interchange) connections can be eliminated, making the connection between the adhesive 7 and the first rubber 3 more stable.

[0026] The virtual glue 6 and spring 2, and the virtual second rubber 5 and spring 2, are contact-to-contact relationships. The advantages are: the static implicit analysis step only includes the meshes of virtual glue 6, virtual second rubber 5, and spring 2, excluding other components of the spring pad; the mesh size is small, and the calculation speed is fast. The static implicit analysis step, lacking dynamic effects, allows for the selection of larger displacement increments than the dynamic explicit step, resulting in more efficient and accurate calculations.

[0027] The static implicit analysis step includes a mesh of virtual glue 6, virtual second rubber 5, and spring 2. In this step, virtual glue 6 and virtual second rubber 5 compress spring 2. The static implicit analysis step stops when the length of spring 2 is less than the distance between glue 7 and the second rubber 1. The beneficial effect is that when the size of spring 2 is compressed to less than the distance between glue 7 and the second rubber 1, it is imported into the dynamic explicit analysis step. At this point, there are gaps between spring 2 and glue 7 and the second rubber 1, preventing analysis anomalies due to initial interference.

[0028] The explicit dynamic analysis step includes a first plastic part 4, a first rubber 3, glue 7, a second rubber 1, and a second plastic part 8. In the explicit dynamic analysis step, virtual glue 6, virtual second rubber 5, and the compressed spring 2, obtained from the implicit static analysis step, are imported. The advantage is that after spring 2 is assembled, the components of the spring pad exhibit complex contact and large strain, which can lead to convergence difficulties when using the implicit static analysis step. The explicit dynamic analysis step does not have convergence issues and can solve such problems involving large strain and complex contact. However, the dynamic effects of the explicit dynamic analysis step are sensitive to large displacement loading. Therefore, by first using the implicit static analysis step to compress spring 2 with large displacement, and then importing the explicit dynamic analysis step to handle the complex contact and large strain, the analysis of such cases involving large displacement loading and simultaneously presenting complex contact and large strain can be solved.

[0029] In the explicit dynamic analysis step, virtual glue 6 and virtual second rubber 5 release spring 2 respectively. The explicit dynamic analysis step stops when spring 2 is in complete contact with glue 7 and second rubber 1. Its beneficial effect is that the virtual glue 6 and virtual second rubber 5, respectively, have the same mesh as the surfaces of glue 7 and second rubber 1, which ensures a stable connection between spring 2 and glue 7 and second rubber 1.

[0030] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A finite element analysis method for spring pads, characterized in that: The finite element analysis method for the spring pad is as follows: First, mesh models of the first plastic component, first rubber, adhesive A, second rubber, and second plastic component of the spring pad are defined as a first type of model; second, mesh models of the spring, the virtual adhesive corresponding to adhesive A, and the virtual second rubber corresponding to the second rubber are defined as a second type of model; a static implicit analysis step is created to analyze the second type of model; a dynamic explicit analysis step is created and the analysis results of the static implicit analysis step are combined to analyze the first type of model; finally, the virtual adhesive and the virtual second rubber are removed. In the static implicit analysis step, the virtual glue and the virtual second rubber compress the spring respectively. When the length of the spring is less than the distance between the glue A and the second rubber, the static implicit analysis step stops. In the dynamic explicit analysis step, the virtual glue, the virtual second rubber, and the compressed spring obtained from the static implicit analysis step are imported. The virtual glue and the virtual second rubber release the spring respectively. When the spring is in complete contact with the glue A and the second rubber, the dynamic explicit analysis step stops.

2. The finite element analysis method for spring pads according to claim 1, characterized in that: The first plastic part, the first rubber, the glue A, the second rubber, the second plastic part, the spring, the virtual glue, and the virtual second rubber are all reduced integral units.

3. The finite element analysis method for spring pads according to claim 2, characterized in that: The shape of the reduced integral unit is hexahedral.

4. The finite element analysis method for spring pads according to claim 1, characterized in that: The grid on the surface of the virtual glue is consistent with the grid on the surface of glue A, and the grid on the surface of the virtual second rubber is consistent with the grid on the surface of the second rubber.

5. The finite element analysis method for spring pads according to claim 1, characterized in that: The mesh on the surface of adhesive A corresponds one-to-one with the mesh on the surface of the first rubber at the nodes of the contact area between adhesive A and the first rubber, and they are connected.

6. The finite element analysis method for spring pads according to claim 1, characterized in that: The virtual adhesive and the spring, and the virtual second rubber and the spring, are in contact as a contact pair.

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