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A Finite Element Mesh Transformation Method Based on Surface Feature Recognition

A feature recognition and finite element technology, applied in the field of finite element structure modeling, can solve the problems of numerous operations, error-prone, cumbersome update process, etc., to ensure the design quality, avoid missing parts, and shorten the design cycle.

Active Publication Date: 2021-10-08
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is cumbersome and error-prone, and it is difficult to avoid problems such as incomplete search of a multi-purpose part or wrong selection of geometric feature points. Especially when the structural design is iteratively changed, the update process of the finite element mesh of a multi-purpose part will become difficult. It is extremely cumbersome, and the time and labor costs are huge

Method used

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  • A Finite Element Mesh Transformation Method Based on Surface Feature Recognition
  • A Finite Element Mesh Transformation Method Based on Surface Feature Recognition
  • A Finite Element Mesh Transformation Method Based on Surface Feature Recognition

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Embodiment 1

[0042]This embodiment proposes a finite element mesh transformation method based on surface feature recognition, which is used to transform the geometry to be transformed in the finite element mesh to the geometry to be feature recognition, such as figure 1 As shown, the finite element mesh transformation method includes the following steps:

[0043] Step S1: Obtain and mark the geometry to be transformed in the finite element grid;

[0044] Step S2: Extracting the external surface of the geometry to be transformed, and marking the geometric feature points on the geometry to be identified;

[0045] Step S3: extracting all external surfaces of the geometry to be transformed;

[0046] Step S4: Summarize all the geometries to be feature-recognized, establish a circular list, filter out a geometric body to be feature-recognized in turn according to the circular list, and extract each external surface of the filtered geometry to be feature-recognized;

[0047] Step S5: Calculatin...

Embodiment 2

[0052] This embodiment is based on the above-mentioned embodiment 1, in order to better realize the present invention, further, as figure 1 As shown, the method specifically includes:

[0053] Step S1: Obtain the group of the geometry Part_0 to be transformed corresponding to the finite element grid F_0 to be transformed and record it as Comp_0;

[0054] Step S2: Extract all external surfaces of the geometry Part_0 to be transformed ,in m is the total number of external surfaces of the geometry Part_0 to be transformed; mark the 3 geometric feature points in the geometry Part_0 to be transformed, and record them as ;

[0055] Step S3: Record the geometry to be recognized as Part_ x ( x =1,2,⋯, k ), the geometry to be identified Part_ x The group in which it is located is recorded as Comp_ x ( x =1,2,⋯, k ),in k is the total number of geometries to be identified.

[0056] Step S4: Extract the geometry Part_ for feature recognition x all exterior surfaces of ,in...

Embodiment 3

[0063] This embodiment is based on any one of the above-mentioned embodiments 1-2, such as figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 As shown, this method uses Tcl language for program development, and runs under the HyperMesh software platform. The specific implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0064] According to one aspect of the present invention, a finite element mesh transformation method based on surface feature recognition is proposed. The method takes all external surfaces of the part geometry as objects, and calculates the similarity matrix of the part by identifying the surface feature parameters, and In this way, it is judged whether the geometric features of the parts to be recognized are consistent with those of the original parts. For parts with completely consistent surface features, the following transformation of the finite element mesh of the...

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Abstract

The present invention proposes a finite element grid transformation method based on surface feature recognition, by proposing the combined body to be transformed and the external surface of the geometry to be feature recognized, the similarity is judged by the surface features, and the judgment is consistent For the combined body to be transformed and the geometry to be characterized, by setting the corresponding geometric feature points and completing the transformation of the finite element mesh through the geometric feature points, automatic identification and change can be realized. The method of the present invention can quickly and automatically divide a finite element model with completely consistent mesh form for a multi-purpose part, which can greatly reduce the modeling process compared with the traditional manual modeling method, and effectively avoid common problems such as part omission and mesh mismatch. Human error.

Description

technical field [0001] The invention belongs to the technical field of finite element structure modeling, in particular to a finite element grid transformation method based on surface feature recognition. Background technique [0002] In professional fields such as aviation, aerospace, vehicles, ships, machinery, etc., the same structural parts are often used multiple times in the entire system components. This design can reduce the number of system parts and CAE (Computer Aided Engineering, computer-aided engineering) structure The memory of the digital model is occupied, and it is beneficial to the process and assembly. This kind of parts is usually called a multi-purpose part. [0003] The structural strength design specification requires that the finite element mesh of a multi-purpose part must be completely consistent. At present, the finite element modeling method for a multi-purpose part is usually: divide the finite element mesh for the initial part, manually find t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F30/15G06F30/17
CPCG06F30/15G06F30/17G06F30/23
Inventor 王彬唐维朱小龙陈晓峰王玖刘晓明
Owner CHENGDU AIRCRAFT INDUSTRY GROUP