Recognition of virtual loops on 3D CAD models based on the B-rep model

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• 作者：Jiing-Yih Lai ; Ming-Hsuan Wang ; Zi-Wei You ; Yu-Kai Chiu…
• 关键词：Virtual loop ; Loop recognition ; Feature recognition ; Blend ; face recognition
• 刊名：Engineering with Computers
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：32
• 期：4
• 页码：593-606
• 全文大小：1,791 KB
• 刊物类别：Computer Science
• 刊物主题：Computer-Aided Engineering and Design
  Mathematical Applications in Chemistry
  Systems Theory and Control
  Calculus of Variations and Optimal Control
  Mechanics
  Applied Mathematics and Computational Methods of Engineering
  
• 出版者：Springer London
• ISSN：1435-5663
• 卷排序：32

文摘

Loops are critical elements in boundary representation (B-rep) models because they link all edges corresponding to a face. Loops can be used in feature recognition for identifying depressions or protrusions. In real 3D CAD models, however, features typically lie across multiple faces, which is beyond the data structure of current B-rep models. This study presents a virtual loop concept to account for all loop types used in CAD models, and develops algorithms for recognizing them. In accordance with the complexity of the recognition algorithm, this study defines three types of loop: single, virtual, and multivirtual. A single loop is the current loop recorded in the B-rep model. A virtual loop lies across faces that are at least G1 continuous. Finally, a multivirtual loop lies across faces that are either G0 or G1 continuous. The proposed loop structure provides a more complete data structure for recognizing various types of features in feature-recognition modules. Several realistic CAD models are presented to confirm the feasibility of the proposed loop-recognition and feature-recognition methods.