CN113032965B

CN113032965B - Method for dividing tetrahedral meshes of tire with equal-pitch complex patterns

Info

Publication number: CN113032965B
Application number: CN202110219273.5A
Authority: CN
Inventors: 张维雁; 徐晓鹏; 侯丹丹; 袁梦丹; 童晓茜; 黄继文; 危银涛; 穆龙海; 王昊
Original assignee: Zhongce Rubber Group Co Ltd; Hangzhou Chaoyang Rubber Co Ltd
Current assignee: Zhongce Rubber Group Co Ltd; Hangzhou Chaoyang Rubber Co Ltd
Priority date: 2021-02-26
Filing date: 2021-02-26
Publication date: 2022-05-27
Anticipated expiration: 2041-02-26
Also published as: CN113032965A

Abstract

The invention relates to a tire pattern design method, in particular to a tetrahedral mesh division method for a tire with equal-pitch complex patterns. The method comprises the steps of judging the overall pattern of the tire tread, dividing a pattern pitch boundary line again and cutting a single-pitch pattern block which is relatively geometrically regular. Then, the single pitch pattern geometry is subjected to grid division, and a complete circle of pattern grids are generated by a rotary replication method. The method has the advantages of simple modeling, high efficiency and good generated grid quality, and can process the radial tire with complicated geometric structure patterns.

Description

Method for dividing tetrahedral meshes of tire with equal-pitch complex patterns

Technical Field

The invention relates to a tire pattern design method, in particular to a tetrahedral mesh division method for a tire with equal-pitch complex patterns.

Background

With the rapid development of the automobile and tire industry, radial tires widely occupy the market with excellent wear resistance and economy, become standard automobile tires, and play a significant role in the whole tire industry. In addition, with the great progress of computer science technology, the application of finite element analysis technology in complex engineering structures shows great role more and more. At present, three-dimensional modeling of finite element analysis of radial tires is mainly that a two-dimensional tire material diagram is drawn firstly, and then a three-dimensional tire model is generated through rotation. The method has the advantages of simple modeling and obvious defects, and the radial tire with complicated geometric structural patterns cannot be processed. The other common three-dimensional modeling method for finite element analysis of radial tires is to use three-dimensional drawing software to model tires, intercept pattern parts and guide the pattern parts into the finite element preprocessing software to automatically mesh and divide. The method also has the problems of low modeling efficiency, incapability of solving due to poor quality of the generated grids and the like.

Disclosure of Invention

Aiming at the problems, the invention provides a tetrahedral mesh division method for a tire with equal-pitch complex patterns, which has the advantages of simple modeling, high efficiency and good generated mesh quality and can process the radial tire with complex geometric structure patterns.

In order to achieve the above object, the present application adopts the following technical solutions:

a tetrahedral mesh dividing method for a tire with equal-pitch complex patterns comprises the following steps:

s1, drawing pattern dividing lines by combining the tire material distribution diagram, and dividing the tire into a smooth tire part and a pattern part;

s2, segmenting the tire model in three-dimensional software according to the position of the pattern segmentation line to obtain a pattern geometric model;

s3, importing the pattern geometric model into hypermesh software, and checking whether the model has the problems of no sealing and the like;

s4, if the tire pattern model axis is not Y axis, adjusting to Y axis, if the tire pattern model axis is Y axis, skipping the step;

s5, geometrically cutting the pattern model according to the pattern trend, cutting out pattern block geometry with one pitch, and reserving the pattern block geometry to delete the rest pattern geometries;

s6, adopting Hypermesh to clean the pattern block geometry, and hiding edges which do not need to distribute nodes by using a toggle command;

s7, setting one side of the pattern block as a source surface and the other side of the pattern block as a slave surface, and carrying out triangular mesh division on the source surface to obtain a source surface mesh;

s8, copying the source surface grid to obtain a slave surface grid, rotating to enable the slave surface grid to coincide with the slave surface geometry in space position, projecting the slave surface unit node to the slave surface geometry through a projection function, and at the moment, establishing a dependency relationship between the slave surface grid and the source grid;

s9, selecting the outer surface of the pattern except the source surface and the slave surface, and carrying out triangular surface mesh division;

s10, carrying out tetrahedral mesh division on the pattern block geometry by means of a Volume tetra mesh tool to obtain pattern block tetrahedral meshes;

s11 the pattern block grid generates a whole circle of pattern grid through copying and rotating, and each pitch grid is separated from each other at the moment;

and S12, carrying out node combination on the pattern grids of a whole circle by means of the face command to obtain the tetrahedral grids with the complex patterns and the equal pitch of the tire.

The invention adopts the technical scheme that the method firstly judges the overall pattern of the tire tread, divides the pattern pitch dividing line again and intercepts a single-pitch pattern block which is relatively geometrically regular. Then based on hypermesh software, carrying out grid division on the single-pitch pattern geometry, and generating a whole circle of pattern grids by a rotary replication method. The method has the advantages of simple modeling, high efficiency and good generated grid quality, and can process the radial tire with complicated geometric structure patterns.

Drawings

FIG. 1 is a flow chart of the method of the present invention.

Fig. 2 is a block geometry diagram processed in step S6.

Fig. 3 is a source grid diagram of the processing in step S7.

Fig. 4 is a diagram showing the result of the processing in step S8.

Fig. 5 is a diagram showing the result of the processing in step S9.

Fig. 6 is a diagram showing the result of the processing in step S10.

Fig. 7 is a diagram showing the result of the processing in step S11.

Fig. 8 is a diagram showing the result of the processing in step S12.

FIG. 9 is a schematic structural diagram of a pattern dividing line according to the present invention.

Figure 10 is a schematic structural view of the block geometric model of the invention.

FIG. 11 is a schematic structural view of a primary side grid according to the present invention.

Fig. 12 is a schematic structural diagram of a pitch grid according to the present invention.

Fig. 13 is a schematic structural view of the integral tessellated lattice of the present invention.

Detailed Description

A tetrahedral mesh partitioning method for a tire with equal-pitch complex patterns, as shown in fig. 1, the method comprising the steps of:

s1, drawing pattern dividing lines (as shown in figure 9) by combining the tire material distribution diagram, and dividing the tire into a plain tire and a pattern;

s3, importing the pattern geometric model into hypermesh, and checking whether the model has the problems of unclosed property and the like;

s5, geometrically cutting the pattern model according to the pattern trend to obtain a pattern geometry with a pitch, which is referred to as pattern block geometry (shown in figure 10) for short, and keeping the pattern block geometry to delete the rest pattern geometries;

s6, adopting Hypermesh to clean the pattern block geometry, and hiding edges which do not need to distribute nodes by using a toggle command; the results are shown in FIG. 2;

s7, setting one side of a pattern block, hereinafter referred to as a source surface for short, and the other side of the pattern block referred to as a slave surface for short, and performing triangular meshing on the source surface to obtain a source surface mesh; the results are shown in FIG. 3;

s8, copying the source surface grid to obtain a slave surface grid, rotating to enable the slave surface grid to coincide with the slave surface geometry in space position, projecting the slave surface unit node to the slave surface geometry through a projection function, and at the moment, establishing a dependency relationship between the slave surface grid and the source grid; the results are shown in FIG. 4;

s9, selecting the outer surface of the pattern except the source surface and the slave surface, and carrying out triangular surface mesh division; the results are shown in FIG. 5;

s10, carrying out tetrahedral mesh division on the pattern block geometry by means of a Volume tetra mesh tool to obtain pattern block tetrahedral meshes; the results are shown in FIG. 6;

the block grid of S11 is rotated by duplication to generate a full circle of pattern grid (as shown in fig. 13), when each pitch grid (as shown in fig. 12) is separated from each other; the results are shown in FIG. 7;

s12 combines the nodes of the pattern mesh of a complete circle by the face command to obtain the regular pitch complex pattern tetrahedral mesh of the tire, and the result is shown in fig. 8.

In the invention, the step S6, the step S7 and the step S9 can ensure the quality of the pattern grids. Through step S8, it can be ensured that after the single pitch grid rotates, the two adjacent pitch grids are almost overlapped or have a small tolerance on the interface.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention, including any reference to the above-mentioned embodiments. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tetrahedral mesh dividing method for a tire with equal-pitch complex patterns is characterized by comprising the following steps:

s3, importing the pattern geometric model into hypermesh software, and checking whether the model has the problem of unclosed;

s5, geometrically cutting the pattern model by combining the pattern trend, cutting out pattern block geometry with one pitch, reserving the pattern block geometry and deleting the rest pattern geometries;

s7, setting one side of the pattern block as a source surface and the other side of the pattern block as a slave surface, and performing triangular meshing on the source surface to obtain a source surface mesh;

s12, carrying out node combination on the pattern meshes of a whole circle by means of the face command to obtain the tire equal pitch complex pattern tetrahedral mesh.