Finite element modeling method and analysis method for stabilizer bar bushing for automobile

Abstract

The present application relates to a kind of finite element modeling method and analysis method of automobile stabilizer bar bushing.Modeling method is: omitting the right side metal framework of automobile stabilizer bar bushing, right side main spring rubber, metal inner tube and metal lower clamp four parts, retain the metal upper clamp of automobile stabilizer bar bushing, left side metal framework and left side main spring rubber three parts are modeled, while multiple node sets for finite element analysis are established for the model built.Node set is by the node required to be applied to symmetric constraint, the node required to be applied to displacement constraint, the node required to be applied to bottom constraint, the node required to be applied to surface constraint, the node set required to be applied to axial displacement constraint is formed.Analysis method is: finite element analysis model is established for automobile stabilizer bar bushing using the aforementioned modeling method, so as to carry out finite element analysis.The present application can simplify modeling analysis process, save modeling analysis time, guarantee the accuracy of modeling analysis.

Description

Technical Field

[0001] This invention belongs to the field of modeling and analysis technology, specifically relating to a finite element modeling method and analysis method for automotive stabilizer bar bushings. Background Technology

[0002] A stabilizer bar, also known as an anti-roll bar, is a component that maintains vehicle stability and prevents excessive body roll. Stabilizer bar bushings are crucial vibration damping and noise reduction parts in a car's suspension system, and their structure directly affects the functionality of the stabilizer bar and even the entire suspension system.

[0003] Finite element modeling analysis is an effective method for optimizing the design of such bushings. Establishing a reasonable finite element model is the foundation for the entire analysis to fit the actual road conditions. Summary of the Invention

[0004] The purpose of this invention is to provide a finite element modeling and analysis method for automotive stabilizer bar bushings that simplifies the process and improves the accuracy and efficiency of modeling and analysis.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A finite element modeling method for automotive stabilizer bar bushings is disclosed. This method involves omitting four parts of the stabilizer bar bushing: the right-side metal frame, the right-side main spring rubber, the metal inner tube, and the lower metal clamp. The upper metal clamp, the left-side metal frame, and the left-side main spring rubber are retained for modeling. Simultaneously, multiple node sets are established for the model used in finite element analysis.

[0006] The node set consists of nodes disposed on the surface of the left main spring rubber for applying symmetrical constraints omitting the right metal skeleton and the right main spring rubber; nodes disposed on the inner surface of the left main spring rubber for applying displacement constraints omitting the metal inner tube; nodes disposed at the bottom of the left main spring rubber for applying bottom constraints omitting the metal lower clamp; nodes disposed on the outer contour surface of the left main spring rubber for applying surface constraints; and nodes disposed at both ends of the left main spring rubber and the left metal skeleton for applying axial displacement constraints.

[0007] A cylindrical coordinate system is established on the inner surface of the left main spring rubber, and the displacement constraint is applied.

[0008] A uniformly distributed load is applied to the nodes on the outer surface of the left main spring rubber required to apply the surface constraint.

[0009] The surfaces of the left main spring rubber and the left metal frame are divided using a triangular mesh to form surface triangular mesh units, and then tetrahedral units are generated using the surface triangular mesh units; the surface of the metal upper clamp is divided using a tetrahedral mesh to form a layer of tetrahedral mesh units.

[0010] The tetrahedral element is a quadratic integral element, and the tetrahedral mesh element is a quadratic integral element.

[0011] The contact relationship between the triangular mesh unit on the rubber surface of the left main spring and the tetrahedral mesh unit on the surface of the metal upper clamp is a sliding frictional contact.

[0012] The contact relationship between the triangular mesh unit on the surface of the left main spring rubber and the triangular mesh unit on the surface of the left metal skeleton is a rigid bonding connection.

[0013] A finite element analysis method for automotive stabilizer bar bushings is provided. The method involves establishing a finite element analysis model for the automotive stabilizer bar bushing using the aforementioned finite element modeling method, and then performing finite element analysis based on the finite element analysis model.

[0014] 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 simplify the modeling and analysis process, thereby saving modeling and analysis time, while also ensuring the accuracy of modeling and analysis. Attached Figure Description

[0015] Appendix Figure 1 This is a model diagram of a standard automotive stabilizer bar bushing.

[0016] Appendix Figure 2 This is a simplified model diagram of the automotive stabilizer bar bushing according to the present invention.

[0017] Appendix Figure 3 This is a screenshot of the inner surface of the rubber of the left main spring in the model.

[0018] Appendix Figure 4 This is a screenshot of the lower surface of the left main spring rubber in the model.

[0019] Appendix Figure 5 This is a diagram showing the set of nodes on the outer contour of the left main spring rubber in the model.

[0020] Appendix Figure 6 This is a diagram showing the nodes at both ends of the left main spring rubber in the model. Detailed Implementation

[0021] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0022] Example 1: The automotive stabilizer bar bushing includes a left metal frame 2, a right metal frame 4, a left main spring rubber 3, a right main spring rubber 5, a metal inner tube 7, a metal upper clamp 1, and a metal lower clamp 6. A typical model for each of these parts is shown in the attached figure. Figure 2 As shown.

[0023] As attached Figure 2 To be continued Figure 6 As shown, a finite element modeling method for automotive stabilizer bar bushings is as follows: the four parts of the automotive stabilizer bar bushing—the right metal skeleton 4, the right main spring rubber 5, the metal inner tube 7, and the metal lower clamp 6—are omitted, while the three parts of the automotive stabilizer bar bushing—the upper metal clamp 1, the left metal skeleton 2, and the left main spring rubber 3—are retained for modeling. At the same time, multiple node sets for finite element analysis are established for the model.

[0024] In the above scheme, the node set consists of the following node sets: 1) Node 12 is set on the surface of the left main spring rubber 3 to apply symmetrical constraints.

[0025] This symmetry constraint allows the omission of two components: the right-side metal frame 4 and the right-side main spring rubber 5. The benefits are: by establishing symmetry constraints, the overall model is simplified by half, significantly saving modeling time while ensuring the accuracy of the analysis.

[0026] 2) Node 9 is set on the inner surface of the left main spring rubber 3 to apply displacement constraints.

[0027] A cylindrical coordinate system is established on the inner surface of the left main spring rubber 3, and displacement constraints are applied to bring the bushing into a compressed state. This displacement constraint eliminates the need for the metal inner tube 7. The advantages are: the node set 9 established on the inner surface of the left main spring rubber 3 can completely replace the cylindrical structure of the inner tube; after adding displacement loads, the bushing can be brought into a compressed state, eliminating the need for the metal inner tube 7, reducing modeling time, and saving analysis resources.

[0028] 3) Node 8, located at the bottom of the left main spring rubber 3, is required for applying bottom constraints.

[0029] The bottom constraint allows the metal lower clamp 6 to be omitted. Its advantages are: replacing the metal lower clamp 6 component with node set 8, and applying displacement loads to the node set, can also achieve the function of a compression bushing. Eliminating the metal lower clamp 6 model significantly reduces modeling time and saves analysis resources.

[0030] 4) Node 10, which is set on the outer surface of the contour of the left main spring rubber 3, is required for applying surface constraints.

[0031] A uniformly distributed load is applied to node 10 on the outer surface of the left main spring rubber 3, which is used to apply surface constraints, to compress it into the upper metal clamp 1, ensuring no interference. The beneficial effect is that by applying a uniformly distributed load to the surface node 10, the bushing is pressed entirely into the upper metal clamp 1 without interference, which greatly improves the accuracy of the analysis.

[0032] 5) Nodes 11, which are set at both ends of the left main spring rubber 3 and the left metal frame 2, are required to apply axial displacement constraints.

[0033] Its beneficial effects are: constraining the axial displacement of nodes 11 at both ends of the bushing can prevent the model from axially shaking during the analysis process and improve the stability of the model.

[0034] In the above scheme, triangular meshes are used to divide the surfaces of the left main spring rubber 3 and the left metal frame 2 to form surface triangular mesh elements. Then, tetrahedral elements are generated using these surface triangular mesh elements, which are quadratic integral elements. The advantages are: the surface triangular mesh elements constructed from triangles more closely resemble the model set; and the generation of tetrahedral quadratic integral elements using 2D elements allows for the rapid generation of usable finite element models of complex automotive parts, saving a significant amount of time required for mesh generation. Simultaneously, it maximizes the fit between the finite element model and the original numerical model, resulting in more accurate analysis results.

[0035] The surface of the metal clamp 1 is divided into a layer of tetrahedral mesh elements, which are quadratic integral elements. The advantages are: the metal clamp component has a simple structure, is used as a rigid body in the analysis, and is in contact with the main spring rubber, so it is not necessary to divide the entire clamp model, only a contact mesh is needed, which greatly reduces the time required for analysis.

[0036] The contact relationship between the surface triangular mesh elements of the left main spring rubber 3 and the tetrahedral mesh elements of the metal upper clamp 1 is sliding friction contact. The contact relationship between the surface triangular mesh elements of the left main spring rubber 3 and the triangular mesh elements of the left metal frame 2 is rigid bonding connection. The advantage of this is that, regardless of whether it is sliding friction contact or rigid bonding contact, it is not necessary to consider the correspondence between mesh nodes of different parts; it is only necessary to ensure that there is no interference between the contact surfaces, which greatly improves modeling efficiency.

[0037] After establishing a finite element analysis model for the automotive stabilizer bar bushing using the aforementioned finite element modeling method, finite element analysis can be performed based on this model.

[0038] 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 modeling method for automotive stabilizer bar bushings, characterized in that: The finite element modeling method for the automotive stabilizer bar bushing is as follows: the four parts of the automotive stabilizer bar bushing, namely the right metal skeleton, the right main spring rubber, the metal inner tube, and the metal lower clamp, are omitted, and the three parts of the automotive stabilizer bar bushing, namely the metal upper clamp, the left metal skeleton, and the left main spring rubber, are retained for modeling. At the same time, multiple node sets for finite element analysis are established for the model. The node set consists of nodes disposed on the surface of the left main spring rubber for applying symmetrical constraints omitting the right metal skeleton and the right main spring rubber, nodes disposed on the inner surface of the left main spring rubber for applying displacement constraints omitting the metal inner tube, nodes disposed at the bottom of the left main spring rubber for applying bottom constraints omitting the metal lower clamp, nodes disposed on the outer contour surface of the left main spring rubber for applying surface constraints, and nodes disposed at both ends of the left main spring rubber and the left metal skeleton for applying axial displacement constraints. A cylindrical coordinate system is established on the inner surface of the left main spring rubber, and the displacement constraint is applied; a uniformly distributed load is applied on the nodes required to apply the surface constraint on the outer contour surface of the left main spring rubber.

2. The finite element modeling method for automotive stabilizer bar bushings according to claim 1, characterized in that: The surfaces of the left main spring rubber and the left metal frame are divided using a triangular mesh to form surface triangular mesh units, and then tetrahedral units are generated using the surface triangular mesh units; the surface of the metal upper clamp is divided using a tetrahedral mesh to form a layer of tetrahedral mesh units.

3. The finite element modeling method for automotive stabilizer bar bushings according to claim 2, characterized in that: The tetrahedral element is a quadratic integral element, and the tetrahedral mesh element is a quadratic integral element.

4. The finite element modeling method for automotive stabilizer bar bushings according to claim 2, characterized in that: The contact relationship between the triangular mesh unit on the rubber surface of the left main spring and the tetrahedral mesh unit on the surface of the metal upper clamp is a sliding frictional contact.

5. The finite element modeling method for automotive stabilizer bar bushings according to claim 2, characterized in that: The contact relationship between the triangular mesh unit on the surface of the left main spring rubber and the triangular mesh unit on the surface of the left metal skeleton is a rigid bonding connection.

6. A finite element analysis method for automotive stabilizer bar bushings, characterized in that: The finite element analysis method for the automotive stabilizer bar bushing is as follows: a finite element analysis model for the automotive stabilizer bar bushing is established using the finite element modeling method for the automotive stabilizer bar bushing as described in any one of claims 1 to 5, and then finite element analysis is performed based on the finite element analysis model.

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