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Method for automatically recognizing minim hole characteristic facing to engineering analysis

A technology of automatic identification and micro-holes, applied in image data processing, 3D modeling, instruments, etc., can solve problems such as imperfections

Inactive Publication Date: 2008-10-01
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, the process of judging hole characteristics through closed loops is still incomplete.

Method used

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  • Method for automatically recognizing minim hole characteristic facing to engineering analysis
  • Method for automatically recognizing minim hole characteristic facing to engineering analysis
  • Method for automatically recognizing minim hole characteristic facing to engineering analysis

Examples

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Embodiment Construction

[0035] Figure 1- Figure 14 shown. An engineering analysis-oriented automatic identification method for micro-hole features, including the steps of loading the ACIS16 development software package on a known computer with a VC++6.0 platform and converting the model into an aggregate with a surface as a unit, which It is characterized in that it also includes the following steps:

[0036] (1.1) Based on the principle of conditional matching, search for hole features for each surface unit;

[0037] (1.2) Calculate the perimeter of the inner ring corresponding to the hole feature, set a threshold or customize a threshold, exclude the hole features with a larger perimeter, color the hole features that meet the conditions, and put them in the list.

[0038] Below in conjunction with accompanying drawing, its technical process is described in detail:

[0039] The invention utilizes the ACIS16 development kit, is realized in the VC++6.0 development environment, and uses the HOOPS gr...

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Abstract

The invention discloses a project analysis-oriented micro-hole character automatic recognition method, which is suitable for being used in a pre-processing stage of generation of a finite element grid. The method comprises a step of installing an ACI16 development software package on a known computer with a VC++6.0 platform, and a step of transforming a model into an aggregation using faces as units. The method is characterized by further comprises steps of: performing hole character searching for each face unit based on a condition matching rule, calculating circumferences of inner rings at entry positions corresponding to the hole characters, setting or self-defining a threshold value from the circumferences, excluding bigger hole characters, coloring hole characters satisfying the conditions, putting the hole characters in a list, and finally saving the model file. According to the invention, two classes of hole characters can be recognized well, and micro-hole characters affecting the project analysis efficiency can be automatically recognized because of using a method for setting the threshold value for the hole characters based on the circumferences of the inner rings at the entry positions corresponding to the hole characters.

Description

technical field [0001] The invention relates to an engineering analysis-oriented automatic identification method for micro-hole features, and is especially suitable for the pre-processing stage of finite element mesh generation. Background technique [0002] The research content involved in the present invention is a research focus at home and abroad, and people have done a lot of work in this respect. [0003] The most representative one is the circular hole feature recognition method proposed by Xiuzhi Qu, which identifies the hole feature by identifying the sharp edge of each edge in the model part to find a closed loop. But this method is only suitable for round hole feature recognition, and only for the recognition of boreholes in the STL model. [0004] The recognition of hole features is mentioned in the free-form surface model simplification method proposed by Nikhil Joshi et al. This method first finds all the free edges in the model parts, and forms a closed loop ...

Claims

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Application Information

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IPC IPC(8): G06T17/40G06T19/00
Inventor 李吉平童刚朱华伟施殿波耿梦
Owner DALIAN POLYTECHNIC UNIVERSITY
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