Finite element modeling method for automobile double-insert-arm suspension bushing

Abstract

The application discloses a finite element modeling method for a double-insert-arm suspension bushing of an automobile, and the suspension bushing comprises a main spring rubber part, a first flow channel plate, a second flow channel plate, a metal framework and a metal outer tube, wherein the main spring rubber part and the metal outer tube are in interference fit; the finite element modeling method comprises the following steps: dividing the grid of the main spring rubber part, the first flow channel plate, the second flow channel plate, the metal framework and the metal outer tube; modifying the grid of the interference area of the main spring rubber part and the metal outer tube; and creating an analysis step, resetting and loading the grid of the modified metal outer tube. According to the application, the interference between the grid of the metal outer tube and the grid of the main spring rubber part is eliminated before analysis, so that the problems of analysis error interruption or analysis result error caused by initial interference in the analysis process are effectively prevented.

Description

Technical Field

[0001] This invention relates to the field of automotive suspension bushings, and in particular to a finite element modeling method for automotive double wishbone suspension bushings. Background Technology

[0002] Double wishbone suspension bushings are crucial vibration damping and noise reduction components in automotive suspension systems, and their structure directly impacts the system's functionality. Finite element analysis (FEM) is an effective method for optimizing the design of such bushings, with FEM modeling forming the foundation of the entire analysis. However, an initial interference fit exists between the primary spring rubber component and the outer metal tube in the double wishbone suspension bushing, which can lead to errors in subsequent analyses.

[0003] Therefore, a finite element modeling method for automotive double wishbone suspension bushings is needed to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a simple and efficient finite element modeling method for automotive double wishbone suspension bushings.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A finite element modeling method for automotive double wishbone suspension bushings, the suspension bushing comprising a main spring rubber component, a first flow channel plate, a second flow channel plate, a metal skeleton, and a metal outer tube; the finite element modeling method includes the following steps:

[0007] The grid is used to divide the main spring rubber component, the first flow channel plate, the second flow channel plate, the metal skeleton, and the metal outer tube.

[0008] Modify the mesh of the interference area of ​​the main spring rubber component and the metal outer tube;

[0009] An analysis step is created to reset and load the modified mesh of the metal outer tube.

[0010] Furthermore, the suspension bushing also includes a first limiting rubber component and a second limiting rubber component;

[0011] The finite element modeling method further includes dividing the first limiting rubber component and the second limiting rubber component into meshes.

[0012] Furthermore, the finite element modeling method also includes:

[0013] The mesh of the main spring rubber component is connected to the mesh of the first limiting rubber component and the mesh of the second limiting rubber mesh component through node sets.

[0014] Furthermore, the analysis step includes a first analysis step, in which the mesh of the metal outer tube in the interference region is reset along the circumferential direction.

[0015] Furthermore, the analysis step also includes a second analysis step, in which a preset displacement is applied to the node set.

[0016] Furthermore, modifying the mesh of the interference region of the main spring rubber component and the metal outer tube also includes establishing a cylindrical coordinate system, and moving the nodes within the interference region radially outward in the cylindrical coordinate system until the main spring rubber component and the metal outer tube are in a state of non-interference.

[0017] Furthermore, the meshes of the main spring rubber component, the first limiting rubber component, and the second limiting rubber component are all high-order tetrahedral units.

[0018] Furthermore, the meshes of the first flow channel plate and the second flow channel plate are two-dimensional low-order elements.

[0019] Furthermore, the meshes of both the metal skeleton and the metal outer tube are low-order hexahedral units.

[0020] Furthermore, there is a one-to-one correspondence between the nodes of the mesh of the main spring rubber component and the mesh of the metal skeleton on the contact surface; or,

[0021] The contact surface between the mesh of the main spring rubber component and the mesh of the metal skeleton is a TIE connection.

[0022] The advantages of this invention are: interference between the mesh of the outer metal tube and the mesh of the main spring rubber component is eliminated before the analysis begins, effectively preventing analysis errors or incorrect results caused by initial interference during the analysis process. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a node set graph provided in an exemplary embodiment of the present invention;

[0025] Figure 2 This is a grid diagram of the metal outer tube and the main spring rubber component in an initial interference state, provided in an exemplary embodiment of the present invention.

[0026] Figure 3 This is a grid diagram showing the metal outer tube and the main spring rubber component in a non-interfering state, provided in an exemplary embodiment of the present invention.

[0027] The reference numerals in the attached drawings include: 1-main spring rubber component, 2-metal skeleton, 3-metal outer tube, 41-first flow channel plate, 42-second flow channel plate, 51-first limiting rubber component, 52-second limiting rubber component, and 6-node set. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, apparatus, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0030] In one embodiment of the present invention, a finite element modeling method for automotive double wishbone suspension bushings is provided, such as... Figure 1 As shown, the suspension bushing includes a main spring rubber component 1, a metal frame 2, a metal outer tube 3, a first flow channel plate 41, a second flow channel plate 42, a first limiting rubber component 51, and a second limiting rubber component 52.

[0031] The finite element modeling method includes the following steps:

[0032] First, the main spring rubber component 1, the metal skeleton 2, the metal outer tube 3, the first flow channel plate 41, the second flow channel plate 42, the first limiting rubber component 51, and the second limiting rubber component 52 are divided into meshes. The mesh of the main spring rubber component 1 is then connected to the meshes of the first limiting rubber component 51 and the second limiting rubber component 52 through node set 6.

[0033] In this embodiment, since the limiting rubber component and the main spring rubber component 1 are originally vulcanized integrally with the metal inner tube, but the metal inner tube has relatively high rigidity, therefore... Figure 1 As shown, the nodes of the mesh in the part of the limiting rubber parts (first limiting rubber parts 51 and second limiting rubber parts 52), the main spring rubber parts 1, and the metal inner tube are directly replaced by the node set 6. In this way, a node set 6 is established between the main spring rubber parts 1 and the limiting rubber parts, which can replace the metal inner tube, reduce the meshing work, and improve the meshing and calculation efficiency.

[0034] Secondly, the mesh of the interference region of the main spring rubber component 1 and the metal outer tube 3 is modified. Specifically, by establishing a cylindrical coordinate system, the nodes within the interference region are moved radially outward in the cylindrical coordinate system until the main spring rubber component 1 and the metal outer tube 3 are in a state of non-interference, that is, the nodes of the mesh are first moved along the circumferential direction until there is no interference (e.g., Figure 3 As shown), the advantage of this arrangement is that it can solve the initial interference problem between the mesh of the outer metal tube 3 and the mesh of the main spring rubber component 1 (as shown). Figure 2 As shown, eliminating interference between the mesh of the outer metal tube 3 and the mesh of the main spring rubber component 1 before the analysis begins can prevent analysis errors or incorrect results caused by initial interference during the analysis process.

[0035] Finally, an analysis step is created to reset and load the modified mesh of the outer metal tube 3. This analysis step includes a first analysis step and a second analysis step. In the first analysis step, the mesh of the outer metal tube 3 in the interference region is reset along the circumferential direction. In the second analysis step, a preset displacement is applied to the node set 6. The created preset displacement is directly loaded onto the node set 6, eliminating the need for meshing the inner metal tube and avoiding the step of creating a reference.

[0036] It should be noted that resetting the modified mesh is to obtain the correct position and stress-strain of the rubber. In the actual product, the rubber in the interference area is compressed, and there is no interference after compression assembly. However, in order to represent interference, the 3D model is in an interference state. The process of modifying the mesh and resetting it compresses the rubber, thus obtaining the correct state of the rubber.

[0037] In this embodiment, after the mesh model is built, two analysis steps are created. In the first analysis step, only the modified meshes of the outer metal tube 3 are moved. These modified meshes are then moved radially back to their initial positions. During the mesh reset process of the outer metal tube 3, the rubber in the interference region is squeezed to the correct position, achieving the correct assembly state. This step can solve the mesh interference problem caused by the initial interference of the model. Furthermore, by scaling the mesh and then resetting it, the actual stress and strain of the component in the interference region can be calculated. In the second analysis step, the displacement is directly applied to the node set 6.

[0038] In one embodiment of the present invention, the meshes of the main spring rubber component 1, the first limiting rubber component 51, and the second limiting rubber component 52 are all high-order tetrahedral elements. The main spring rubber component 1 and the limiting rubber component have relatively complex structures; dividing them into tetrahedral elements can improve mesh generation efficiency, and using high-order elements can improve analysis accuracy.

[0039] In one embodiment of the present invention, the meshes of the first flow channel plate 41 and the second flow channel plate 42 are two-dimensional low-order elements. The two-dimensional low-order elements are rigid body constraints. At the same time, the first flow channel plate 41 and the second flow channel plate 42 are not the objects of analysis. Using two-dimensional low-order elements and making the two-dimensional low-order elements rigid body constraints can greatly reduce the amount of computation and improve the computational efficiency.

[0040] In one embodiment of the present invention, the mesh of the metal skeleton 2 is a low-order hexahedral cell or a high-order tetrahedral cell. The structure of the metal skeleton 2 is relatively simple. Under the condition that the workload of dividing the metal skeleton 2 into hexahedral cells and tetrahedral cells is not much different, this embodiment preferably uses a low-order hexahedral cell mesh of the metal skeleton 2 to obtain higher computational efficiency.

[0041] In one embodiment of the present invention, the mesh of the outer metal tube 3 is a low-order hexahedral cell or a high-order tetrahedral cell. The outer metal tube 3 has a relatively simple structure. Given that the workload of dividing the outer metal tube 3 into hexahedral cells and tetrahedral cells is roughly the same, this embodiment preferably uses a low-order hexahedral cell mesh for the outer metal tube 3 to achieve higher computational efficiency.

[0042] In one embodiment of the present invention, there is a one-to-one correspondence between the nodes of the mesh of the main spring rubber component 1 and the mesh of the metal skeleton 2 on the contact surface. By setting a one-to-one correspondence between the nodes, the stability of the contact during the analysis process can be improved, avoiding non-convergence due to contact and affecting the results.

[0043] In one embodiment of the present invention, the contact surface between the mesh of the main spring rubber component 1 and the mesh of the metal skeleton 2 is a TIE connection. The TIE connection enables proper stress and strain transfer, thus resolving the issue that the mesh of the main spring rubber component 1 and the mesh of the metal skeleton 2 are of different types of mesh elements.

[0044] This invention provides a finite element modeling method for automotive double wishbone suspension bushings. The modeling method uses a combination of two-dimensional and three-dimensional meshes, and the three-dimensional mesh uses a combination of tetrahedral and hexahedral elements. This not only improves the modeling and calculation efficiency of complex models, but also solves the problem of initial interference of the model.

[0045] The order of the above embodiments of the present invention is merely for description and does not represent the superiority or inferiority of the embodiments.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A finite element modeling method for automotive double wishbone suspension bushings, characterized in that, The suspension bushing includes a main spring rubber component, a first flow channel plate, a second flow channel plate, a metal frame, a first limiting rubber component, a second limiting rubber component, and a metal outer tube; the finite element modeling method includes the following steps: The main spring rubber component, the first flow channel plate, the second flow channel plate, the metal skeleton, the first limiting rubber component, the second limiting rubber component, and the metal outer tube are divided into grids. The grid of the main spring rubber component is connected to the grid of the first limiting rubber component and the grid of the second limiting rubber component through node sets. Modifying the mesh of the interference region of the main spring rubber component and the metal outer tube includes establishing a cylindrical coordinate system and moving the nodes within the interference region radially outward in the cylindrical coordinate system until the main spring rubber component and the metal outer tube are in a state of non-interference. An analysis step is created, including a first analysis step and a second analysis step. In the first analysis step, the mesh of the metal outer tube in the interference region is reset along the circumferential direction. In the second analysis step, a preset displacement is applied to the node set, and the modified mesh of the metal outer tube is reset and loaded.

2. The finite element modeling method for automotive double wishbone suspension bushings according to claim 1, characterized in that, The meshes of the main spring rubber component, the first limiting rubber component, and the second limiting rubber component are all high-order tetrahedral elements.

3. The finite element modeling method for automotive double wishbone suspension bushings according to claim 1, characterized in that, The meshes of the first flow channel plate and the second flow channel plate are two-dimensional low-order elements.

4. The finite element modeling method for automotive double wishbone suspension bushings according to claim 1, characterized in that, Both the metal skeleton and the metal outer tube have low-order hexahedral cells.

5. The finite element modeling method for automotive double wishbone suspension bushings according to claim 1, characterized in that, There is a one-to-one correspondence between the nodes of the grid on the contact surface of the main spring rubber component and the grid on the metal skeleton; or, The contact surface between the mesh of the main spring rubber component and the mesh of the metal skeleton is a TIE connection.

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