A meshing method for metal and rubber parts of rod end joints

Abstract

The present invention discloses a meshing method for rod end joints between metal and rubber parts. The method comprises the following steps: performing two-dimensional cross-section processing on the rubber, spacer, core shaft and external joint; the processed two-dimensional cross-section includes the entire cross-section of the rubber and spacer and the cross-section of the core shaft and the external joint, which is the first part; and the remaining part is the second part. The two-dimensional cross-section of the first part is meshed; the two-dimensional cross-section mesh after meshing is rotated into a three-dimensional mesh to complete the meshing of the first part and obtain a three-dimensional mesh model of the first part; performing geometric model processing on the second part and meshing the second part after the geometric model processing to obtain a three-dimensional mesh model of the second part; assembling and binding the two-part three-dimensional mesh models to complete the meshing; in the present invention, no segmentation is performed between the rubber and the metal, and the segmentation surface of the product is set inside the metal part, thereby avoiding the problem of non-common nodes in the binding process of the metal and the rubber and improving the stress calculation accuracy.

Description

Technical Field

[0001] The present invention belongs to the technical field of mesh division of finite element analysis, and in particular relates to a mesh division method between metal and rubber parts of a rod end joint. Background Art

[0002] A rod end joint is a flexible connection installed at the end of a rod, including a connecting rod joint, a traction rod joint, and a rotor flexible connection. It is widely used in control and power transmission systems in fields such as rail transportation and aerospace. Rod end joints are usually composed of a core shaft, a spacer, an external joint, and rubber vulcanization. According to the structural form, they are divided into single-layer rod end joints and multi-layer rod end joints. Among them, multi-layer rod end joints refer to metal rubber vulcanized rod end joints containing multiple layers of rubber and multiple layers of spacers. Multi-layer rod end joints have better multi-axis load-bearing capacity and can simultaneously withstand large radial loads, axial loads, torsional loads, deflection loads and other composite loads.

[0003] During the development of multi-layer rod ends, assessing the fatigue life of the rod ends is a critical consideration. Both experimental and finite element simulation methods are used for this purpose. Given the time and cost associated with experimental methods, finite element simulation is becoming increasingly popular. Using finite element simulation in place of experimental testing during the preliminary research and design phases reduces the number of trials and tests, improves the first-time design success rate for rod ends, shortens the development cycle, and reduces development costs.

[0004] The difficulty in simulating the fatigue life of multi-layer rod-end joints lies in the accuracy and efficiency of the analysis. Meshing is crucial for ensuring both accurate calculation results and improved efficiency. Conventional meshing methods create separate 2D and 3D meshes for each rubber layer and each spacer layer. This method is inefficient for these multi-layer rod-end joints, especially for rotor flexible connection rod-end joints with more than 30 layers of rubber and spacers, where meshing alone can take a week. Therefore, conventional meshing methods struggle to achieve a balanced balance between simulation accuracy and efficiency for these multi-layer rod-end joints. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a mesh division method between the metal and rubber parts of the rod end joint. By not dividing the rubber and the metal, the dividing surface of the product is set inside the metal part, which avoids the problem of non-common nodes during the binding process of the metal and rubber, and improves the stress calculation accuracy.

[0006] The technical solutions adopted by the present invention to solve the problems of the prior art are as follows:

[0007] Provided is a meshing method for metal and rubber parts of a rod end joint, wherein the rod end joint includes rubber, a spacer, a core shaft and an external joint;

[0008] Performing two-dimensional cross-section processing on the rubber, spacer, core shaft, and external joint, wherein the two-dimensional cross-section includes the entire cross-section of the rubber and spacer and a partial cross-section of the core shaft and external joint, which is defined as the first part, and the remaining part is defined as the second part, wherein the first part is axisymmetric and the second part is non-axisymmetric;

[0009] Performing two-dimensional cross-sectional meshing on the first portion;

[0010] The two-dimensional cross-sectional mesh after meshing is rotated into a three-dimensional mesh, completing the first part of meshing and obtaining the first part of the three-dimensional mesh model;

[0011] performing geometric model processing on the second part, and performing mesh division on the second part after the geometric model processing to obtain a three-dimensional mesh model of the second part;

[0012] The first three-dimensional mesh model and the second three-dimensional mesh model are assembled and bound to complete mesh division.

[0013] Furthermore, the two-dimensional cross-section processing includes extracting two-dimensional cross-sections of the entire cross-section of the rubber and spacer of the first part and the cross-section of the core shaft and the outer joint, and the extracted part is half of the cross-section to the right of the center line.

[0014] Furthermore, the rotation is based on Hypermesh software and specifically includes the following steps:

[0015] S1. Use the spin command to rotate the 2D cross-section mesh 360 degrees around the X-axis to obtain a 3D mesh model of half the first section.

[0016] S2. Use the reflect command to map the half of the three-dimensional mesh model to the YZ plane to obtain a complete three-dimensional mesh model;

[0017] S3. The two halves of the three-dimensional mesh model obtained through mapping are then subjected to common node processing on the YZ plane to obtain the three-dimensional mesh model of the first part.

[0018] Furthermore, the geometric model processing is based on Proe software, and the geometric model processing simplifies the core shaft and the external joint of the second part into one-quarter of the core shaft and the external joint.

[0019] Furthermore, the meshing of the second part after the geometric model processing is performed based on Hypermesh software, including:

[0020] T1. After simplifying the geometric model, export the quarter core shaft and external joint in STP format. Import this file into Hypermesh software for surface meshing and 3D meshing to create a 3D mesh model of the quarter core shaft and external joint.

[0021] T2. The three-dimensional mesh model of the quarter mandrel and the outer joint is divided into four parts using the reflect command and mapped to the XY plane and YZ plane to obtain four quarter three-dimensional mesh models;

[0022] T3. Perform common node processing on the four quarter three-dimensional mesh models on the XY plane and the YZ plane.

[0023] The beneficial effects are as follows:

[0024] During the meshing process of the present invention, the rubber and the metal are not divided, and the dividing surface of the product is set inside the metal part, which avoids the problem of non-common nodes during the binding process of the metal and rubber and improves the stress calculation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a flow chart of the grid division method of this embodiment;

[0026] Figure 2 is a two-dimensional cross-sectional view of the rod end joint of this embodiment;

[0027] Figure 3 is a two-dimensional cross-section of the first portion of this embodiment;

[0028] Figure 4 A mesh division diagram of a two-dimensional cross section of the first part of this embodiment;

[0029] Figure 5 A three-dimensional mesh model of the first part of this embodiment;

[0030] Figure 6 The three-dimensional mesh model of the second part of this embodiment;

[0031] Figure 7 This is the overall three-dimensional mesh model after the first and second parts of the rod end joint are bound together in this embodiment. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with specific embodiments. Example

[0033] like Figure 1 As shown, this embodiment provides a meshing method for metal and rubber parts of a rod end joint, wherein the rod end joint includes a rubber 1, a spacer 2, a core shaft 3 and an external joint 4;

[0034] Perform two-dimensional cross-section processing on the rubber 1, spacer 2, core shaft 3, and external joint 4. The two-dimensional cross-section includes the entire cross-section Q of the rubber 1 and spacer 2 and a partial cross-section B of the core shaft 3 and external joint 4, which is defined as the first section Y. The remaining section is defined as the second section R. The first section Y is axisymmetric, and the second section R is non-axisymmetric.

[0035] Performing two-dimensional cross-sectional meshing on the first portion Y;

[0036] The two-dimensional cross-sectional mesh after meshing is rotated into a three-dimensional mesh, completing the first part of meshing and obtaining the first part Y three-dimensional mesh model;

[0037] Performing geometric model processing on the second part R, and meshing the second part R after the geometric model processing to obtain a three-dimensional mesh model of the second part R;

[0038] The first three-dimensional mesh model and the second three-dimensional mesh model are assembled and bound to complete mesh division.

[0039] like Figure 2 The three-dimensional model of the rod end joint is shown. By analyzing its structural characteristics, the rod end joint is divided into a first part Y and a second part R, wherein the first part Y includes the entire cross-section Q of the rubber 1 and the spacer 2 and a partial cross-section B of the core shaft 3 and the external joint 4.

[0040] like Figure 3 As shown, the two-dimensional section of the first part Y is extracted, and a dwg file is generated. It is processed using Cad software. Considering the left-right symmetry, half of the section to the right of the center line is taken.

[0041] like Figures 3 and 4 As shown, for the two-dimensional cross-section of the first part that has been processed, the dxf format file is exported and imported into the Hypermesh software for meshing.

[0042] like Figure 5 As shown, the completed Figure 4 The two-dimensional cross-sectional mesh shown in the figure is rotated 360 degrees around the X axis using the spin command in the Hypermesh software to obtain a three-dimensional mesh model of the half of the axisymmetric part; then, the half of the three-dimensional mesh model is mapped to the YZ plane using the reflect command to obtain a complete three-dimensional mesh model; the nodes of the two halves of the three-dimensional mesh model on the YZ plane are then processed as common nodes to obtain the following: Figure 5 The three-dimensional mesh model of the first part Y is shown.

[0043] The core shaft 1 and the external joint 4 of the second part Q are processed by Proe software. The symmetry of the core shaft 1 and the external joint 4 of the second part R is analyzed, and the quarter geometric model is meshed.

[0044] The geometric model of the processed quarter core shaft 1 and the external joint 4 of the second part R is exported as an stp format file and imported into Hypermesh software for surface mesh division.

[0045] like Figure 6 As shown in the figure, after the surface mesh division is completed, the second part is divided into three-dimensional meshes by using Hypermesh software to obtain a three-dimensional mesh model of one quarter of the second part R, and then the reflect command is used to map it with the XY plane and YZ plane to obtain a complete three-dimensional mesh model; then the nodes of these four quarters of the three-dimensional mesh models on the XY plane and YZ plane are processed as common nodes to obtain the three-dimensional mesh model of the second part R.

[0046] like Figure 7 As shown, the obtained three-dimensional mesh model of the first part Y and the obtained three-dimensional mesh model of the second part R are assembled and bound; the mesh model of the entire rod end joint is obtained, and the mesh division is completed.

[0047] Obviously, the above embodiments are merely examples for the purpose of clearly illustrating the technical solutions of the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be protected by the claims of the present invention.

Claims

1. A method for meshing between metal and rubber parts of a rod end joint, characterized in that: The rod end joint includes rubber, a spacer, a core shaft and an external joint; Performing two-dimensional cross-section processing on the rubber, spacer, core shaft, and external joint, wherein the two-dimensional cross-section includes the entire cross-section of the rubber and spacer and a partial cross-section of the core shaft and external joint, which is defined as the first part, and the remaining part is defined as the second part, wherein the first part is axisymmetric and the second part is non-axisymmetric; Performing two-dimensional cross-sectional meshing on the first portion; The two-dimensional cross-sectional mesh after meshing is rotated into a three-dimensional mesh, completing the first part of meshing and obtaining the first part of the three-dimensional mesh model; performing geometric model processing on the second part, and performing mesh division on the second part after the geometric model processing to obtain a three-dimensional mesh model of the second part; Assembling and binding the first three-dimensional mesh model and the second three-dimensional mesh model to complete mesh division; The two-dimensional cross-section processing includes extracting two-dimensional cross-sections of the entire cross-section of the rubber and the spacer of the first part and the cross-section of the core shaft and the external joint, and the extracted part is the half cross-section to the right of the center line; The rotation is based on Hypermesh software and specifically includes the following steps: S1. Use the spin command to rotate the 2D cross-section mesh 360 degrees around the X-axis to obtain a 3D mesh model of half the first section. S2. Use the reflect command to map the half of the three-dimensional mesh model to the YZ plane to obtain a complete three-dimensional mesh model; S3. The two halves of the three-dimensional mesh model obtained by mapping are then processed in the YZ plane to obtain a common node to obtain a three-dimensional mesh model of the first part; the geometric model processing is based on Proe software, and the geometric model processing simplifies the mandrel and the outer joint of the second part into a quarter of the mandrel and the outer joint; The meshing of the second part after the geometric model processing is performed based on Hypermesh software, including: T1. After simplifying the geometric model, export the quarter core shaft and external joint in STP format. Import this file into Hypermesh software for surface meshing and 3D meshing to create a 3D mesh model of the quarter core shaft and external joint. T2. The three-dimensional mesh model of the quarter mandrel and the outer joint is divided into four parts using the reflect command and mapped to the XY plane and YZ plane to obtain four quarter three-dimensional mesh models; T3. Perform common node processing on the four quarter three-dimensional mesh models on the XY plane and the YZ plane.

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