CN113987866A - Grid division method for metal and rubber parts of rod end joint - Google Patents
Grid division method for metal and rubber parts of rod end joint Download PDFInfo
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- CN113987866A CN113987866A CN202111207874.0A CN202111207874A CN113987866A CN 113987866 A CN113987866 A CN 113987866A CN 202111207874 A CN202111207874 A CN 202111207874A CN 113987866 A CN113987866 A CN 113987866A
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Abstract
The invention discloses a method for meshing between metal and rubber pieces of a rod end joint, which comprises the steps of carrying out two-dimensional cross section processing on rubber, a spacer, a mandrel and an outer joint, wherein the processed two-dimensional cross section comprises the whole cross sections of the rubber and the spacer and the partial cross sections of the mandrel and the outer joint, and is a first part, and the rest is a second part, and carrying out meshing on the two-dimensional cross section of the first part; rotating the two-dimensional section grid subjected to meshing into a three-dimensional grid to complete the first part of meshing so as to obtain a first part of three-dimensional grid 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 second part three-dimensional mesh model; assembling and binding the two parts of three-dimensional grid models to complete grid division; according to the invention, the rubber and the metal are not divided, and the dividing surface of the product is arranged in the metal piece, so that the problem of non-common node in the binding process of the metal and the rubber is avoided, and the stress calculation precision is improved.
Description
Technical Field
The invention belongs to the technical field of meshing of finite element analysis, and particularly relates to a meshing method for metal and rubber parts of a rod end joint.
Background
The rod end joint is a flexible connection arranged at the rod end, comprises a connecting rod joint, a traction rod joint and a rotor wing flexible connection, and is widely applied to control and power transmission systems in the fields of rail transit, aerospace and the like; the rod end joint is generally formed by vulcanizing a mandrel, a spacer, an external joint and rubber and is divided into a single-layer rod end joint and a multi-layer rod end joint according to the structural form, wherein the multi-layer rod end joint is a metal rubber vulcanized rod end joint comprising multiple layers of rubber and multiple layers of spacers, and the multi-layer rod end joint has better multi-axis bearing capacity and can simultaneously bear composite loads such as larger radial load, axial load, torsional load, deflection load and the like.
In the development process of the multilayer rod end joint, the fatigue life evaluation of the rod end joint is a very critical item. The fatigue life of the rod end joint is evaluated by a test method and a finite element simulation analysis method, and the finite element simulation analysis method is applied more and more widely at present in consideration of the period and the cost of the test method. A finite element simulation analysis method is adopted to replace a test in the early pre-research and design stages, so that trial production and test times are reduced, the one-time design success rate of the rod end joint is improved, the development period of the rod end joint is shortened, and the development cost of the rod end joint is reduced.
The difficulty of simulation analysis of the fatigue life of the multilayer rod end joint lies in the accuracy and efficiency of analysis, how to ensure the accuracy of a calculation result and improve the efficiency of simulation analysis is ensured, and the grid division is particularly important. According to a conventional meshing method, each layer of rubber and each layer of spacer are divided into two-dimensional and three-dimensional meshes independently, the meshing efficiency of the multi-layer structure rod end joint is low, particularly thirty layers of rubber and spacers are arranged on some rotor flexible connection rod end joints, and only one week of time is needed for meshing, so that the conventional meshing method is difficult to balance and meet the simulation accuracy and efficiency of the multi-layer rod end joint.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for dividing grids between metal and rubber pieces of a rod end joint, wherein the division surfaces of products are arranged in the metal pieces by not dividing the metal and the rubber pieces, so that the problem of non-common nodes in the process of binding the metal and the rubber is avoided, and the stress calculation precision is improved.
The technical scheme adopted for solving the problems in the prior art is as follows:
providing a grid dividing method used between metal and rubber pieces of a rod end joint, wherein the rod end joint comprises rubber, a spacer, a mandrel and an outer joint;
performing two-dimensional cross section processing on the rubber, the spacer, the mandrel and the outer joint, wherein the two-dimensional cross section comprises the whole cross section of the rubber and the spacer and the partial cross section of the mandrel and the outer joint and is defined as a first part, the rest parts are defined as a second part, the first part is axisymmetric, and the second part is not axisymmetric;
performing two-dimensional cross-sectional meshing on the first portion;
rotating the two-dimensional section grid subjected to meshing into a three-dimensional grid to complete the first part of meshing so as to obtain a first part of three-dimensional grid 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 second part three-dimensional mesh model;
and assembling and binding the first part of three-dimensional grid model and the second part of three-dimensional grid model to finish grid division.
Further, the two-dimensional section processing comprises the step of extracting two-dimensional sections of all sections of the rubber and the spacer of the first part and sections of the mandrel and the outer joint part, wherein the extracted part is a half section on the right side of the center line.
Further, the rotation is based on Hypermesh software, and specifically comprises the following steps:
s1, rotating the two-dimensional section grid for 360 degrees around an X axis by using a spin command to obtain a half three-dimensional grid model of the first part;
s2, mapping the half three-dimensional grid model by a reflex command in a YZ plane to obtain a complete three-dimensional grid model;
and S3, performing common node processing on the left half three-dimensional grid model and the right half three-dimensional grid model which are obtained through mapping on a YZ plane to obtain a first part three-dimensional grid model.
Further, 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.
Further, the meshing of the second part after the geometric model processing is based on Hypermesh software, and the meshing comprises:
t1, exporting one fourth of stp format files of the mandrel and the outer joint after geometric model simplification, importing the files into Hypermesh software, and carrying out surface meshing and three-dimensional meshing to form one fourth of three-dimensional mesh models of the mandrel and the outer joint;
t2, mapping the quarter of mandrel and outer joint three-dimensional grid division model by an XY plane and a YZ plane by using a reflex command to obtain four quarter of three-dimensional grid models;
and T3, performing common node processing on the four quarter three-dimensional grid models on an XY plane and a YZ plane.
The beneficial effects are as follows:
in the grid division process, the rubber and the metal are not divided, and the dividing surface of the product is arranged in the metal piece, so that the problem that the metal and the rubber are not in common node in the binding process is avoided, and the stress calculation precision is improved.
Drawings
FIG. 1 is a flowchart of a mesh division method according to the present embodiment;
FIG. 2 is a two-dimensional cross-sectional view of a rod end joint of the present embodiment;
FIG. 3 is a two-dimensional cross-section of a first portion of the present embodiment;
FIG. 4 is a grid-divided view of a two-dimensional cross-section of the first portion of the present embodiment;
FIG. 5 is a three-dimensional mesh model of the first part of the present embodiment;
FIG. 6 is a three-dimensional mesh model of the second part of the present embodiment;
fig. 7 is an overall three-dimensional mesh model of the rod end joint according to the embodiment after the first part and the second part are bound.
Detailed Description
The present invention will be further described with reference to the following embodiments.
Examples
As shown in fig. 1, the present embodiment provides a method for meshing metal and rubber members of a rod end joint, where the rod end joint includes a rubber 1, a spacer 2, a mandrel 3, and an outer joint 4;
performing two-dimensional cross section treatment on the rubber 1, the spacer 2, the mandrel 3 and the outer joint 4, wherein the two-dimensional cross section comprises the whole cross section Q of the rubber 1 and the spacer 2 and the partial cross section B of the mandrel 3 and the outer joint 4, and is defined as a first part Y, the rest part is defined as a second part R, the first part Y is axially symmetric, and the second part R is non-axially symmetric;
performing two-dimensional cross-sectional meshing on the first part Y;
rotating the two-dimensional cross section grid subjected to meshing into a three-dimensional grid to complete the meshing of the first part to obtain a Y three-dimensional grid model of the first part;
performing geometric model processing on the second part R, and performing grid division on the second part R after the geometric model processing to obtain a second part R three-dimensional grid model;
and assembling and binding the first part of three-dimensional grid model and the second part of three-dimensional grid model to finish grid division.
The three-dimensional model of the rod end joint shown in fig. 2 is analyzed for structural characteristics, and the rod end joint is divided into a first part Y and a second part R, wherein the first part Y comprises the whole section Q of the rubber 1 and the spacer 2 and the partial section B of the mandrel 3 and the outer joint 4.
As shown in fig. 3, a two-dimensional cross section is extracted from the first part Y to generate a dwg file, and the dwg file is processed by Cad software to take a half cross section on the right side of the center line in consideration of left-right symmetry.
As shown in fig. 3 to 4, a dxf format file is exported to the two-dimensional cross section of the processed first part, and is imported into Hypermesh software for mesh division.
As shown in fig. 5, the completed two-dimensional cross-sectional mesh shown in fig. 4 is rotated 360 degrees around the X-axis by using spin commands in Hypermesh software, so as to obtain a half three-dimensional mesh model of the axisymmetric part; then, mapping the half three-dimensional grid model by a reflex command in a YZ plane to obtain a complete three-dimensional grid model; then, the nodes of the left and right two half three-dimensional mesh models on the YZ plane are subjected to common node processing, so as to obtain the three-dimensional mesh model of the first part Y shown in fig. 5.
Carrying out geometric model processing on the mandrel 1 and the outer joint 4 of the second part Q by adopting Proe software; and analyzing the symmetry of the mandrel 1 and the outer joint 4 of the second part R, and meshing the quarter geometric model.
And exporting the geometric models of the mandrel 1 and the outer joint 4 which are one fourth of the second part R after the treatment, and importing the geometric models into Hypermesh software for surface mesh division.
As shown in fig. 6, for the second part after the surface meshing is completed, the Hypermesh software is used for performing three-dimensional meshing to obtain a quarter three-dimensional mesh model of the second part R, and then the quarter three-dimensional mesh model is mapped by using a reflex command with an XY plane and a YZ plane to obtain a complete three-dimensional mesh model; and carrying out common node processing on the nodes of the four quarter three-dimensional grid models on the XY plane and the YZ plane to obtain a three-dimensional grid model of the second part R.
As shown in fig. 7, the obtained three-dimensional mesh model of the first part Y and the three-dimensional mesh model of the second part R are subjected to assembly and binding processing; and obtaining a grid model of the whole rod end joint to complete grid division.
It should be understood that the above examples are only for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection of the claims of the present invention.
Claims (5)
1. A method for dividing grids between metal and rubber pieces of a rod end joint is characterized in that the rod end joint comprises rubber, a spacer, a mandrel and an outer joint;
performing two-dimensional cross section processing on the rubber, the spacer, the mandrel and the outer joint, wherein the two-dimensional cross section comprises the whole cross section of the rubber and the spacer and the partial cross section of the mandrel and the outer joint and is defined as a first part, the rest parts are defined as a second part, the first part is axisymmetric, and the second part is not axisymmetric;
performing two-dimensional cross-sectional meshing on the first portion;
rotating the two-dimensional section grid subjected to meshing into a three-dimensional grid to complete the first part of meshing so as to obtain a first part of three-dimensional grid 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 second part three-dimensional mesh model;
and assembling and binding the first part of three-dimensional grid model and the second part of three-dimensional grid model to finish grid division.
2. The method of claim 1, wherein the two-dimensional cross-sectional processing comprises two-dimensional cross-sectional extraction of the entire cross-section of the rubber and spacer of the first portion and the cross-section of the core shaft and outer joint portion, the extracted portion being a half cross-section to the right of the centerline.
3. The method for meshing between metal and rubber pieces of a rod end joint according to claim 1, wherein the rotation is based on Hypermesh software, comprising the steps of:
s1, rotating the two-dimensional section grid for 360 degrees around an X axis by using a spin command to obtain a half three-dimensional grid model of the first part;
s2, mapping the half three-dimensional grid model by a reflex command in a YZ plane to obtain a complete three-dimensional grid model;
and S3, performing common node processing on the left half three-dimensional grid model and the right half three-dimensional grid model which are obtained through mapping on a YZ plane to obtain a first part three-dimensional grid model.
4. The method of claim 1, wherein the geometric model process is based on Proe software, and wherein the geometric model process reduces the mandrel and outer joint of the second portion to one quarter of the mandrel and outer joint.
5. The method for meshing between metal and rubber members of a rod end joint according to claim 1, wherein the meshing of the second part after the geometric model processing is based on Hypermesh software, comprising:
t1, exporting one fourth of stp format files of the mandrel and the outer joint after geometric model simplification, importing the files into Hypermesh software, and carrying out surface meshing and three-dimensional meshing to form one fourth of three-dimensional mesh models of the mandrel and the outer joint;
t2, mapping the quarter of mandrel and outer joint three-dimensional grid division model by an XY plane and a YZ plane by using a reflex command to obtain four quarter of three-dimensional grid models;
and T3, performing common node processing on the four quarter three-dimensional grid models on an XY plane and a YZ plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111207874.0A CN113987866A (en) | 2021-10-18 | 2021-10-18 | Grid division method for metal and rubber parts of rod end joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111207874.0A CN113987866A (en) | 2021-10-18 | 2021-10-18 | Grid division method for metal and rubber parts of rod end joint |
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| Publication Number | Publication Date |
|---|---|
| CN113987866A true CN113987866A (en) | 2022-01-28 |
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|---|---|---|---|
| CN202111207874.0A Pending CN113987866A (en) | 2021-10-18 | 2021-10-18 | Grid division method for metal and rubber parts of rod end joint |
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| CN (1) | CN113987866A (en) |
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2021
- 2021-10-18 CN CN202111207874.0A patent/CN113987866A/en active Pending
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