北京航空航天大学学报 ›› 2016, Vol. 42 ›› Issue (1): 201-210.doi: 10.13700/j.bh.1001-5965.2015.0049

• 论文 • 上一篇    

基于约束Delaunay三角剖分的筋特征识别与构建算法

周敏1, 郑国磊1, 罗智波2, 陈树林3   

  1. 1. 北京航空航天大学机械工程及自动化学院, 北京 100083;
    2. 麦吉尔大学机械工程系, 蒙特利尔 H3A0G4;
    3. 沈阳飞机工业(集团)有限公司, 沈阳 110034
  • 收稿日期:2015-01-26 出版日期:2016-01-20 发布日期:2016-01-28
  • 通讯作者: 郑国磊,Tel.:010-82339128E-mail:zhengguolei@buaa.edu.cn E-mail:zhengguolei@buaa.edu.cn
  • 作者简介:周敏女,博士。主要研究方向:CAD/CAM、数字化设计与制造、计算几何。E-mail:zhoumin.buaa@139.com;郑国磊男,博士,教授,博士生导师。主要研究方向:智能CAD、数控自动编程技术、工装智能设计。Tel.:010-82339128E-mail:zhengguolei@buaa.edu.cn
  • 基金资助:
    国家科技重大专项子课题(2012ZX04010051)

Algorithm for recognizing and constructing rib feature based on constrained Delaunay triangulation

ZHOU Min1, ZHENG Guolei1, LUO Zhibo2, CHEN Shulin3   

  1. 1. School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
    2. Department of Mechanical Engineering, Mcgill University, Montreal H3A0G4, Canada;
    3. Shenyang Aircraft Industry(Group) Corporation Ltd, Shenyang 110034, China
  • Received:2015-01-26 Online:2016-01-20 Published:2016-01-28
  • Supported by:
    National Science and Technology Major Project of the Ministry of Science and Technology of China (2012ZX04010051)

摘要: 为识别飞机结构件中的筋特征,提出一种基于Delaunay三角剖分的识别与构建算法。首先,根据飞机结构件腹板和平顶筋加工方式的不同以及二者几何上的相似性,引入广义腹板概念表示腹板面和平顶筋,并建立筋的表示模型;其次,利用约束Delaunay三角剖分算法,剖分广义腹板面,进行平顶筋面和腹板面的识别与区分,并提取平顶筋面的中轴线;最后,利用中轴线拆分平顶筋并将斜顶筋作为广义腹板的子特征进行识别与构建。实例结果表明,该算法是正确和有效的。

关键词: 数控编程, 特征识别, 飞机结构件, 筋, Delaunay三角剖分

Abstract: In order to recognize the rib feature in aircraft structural parts, a recognition and construction algorithm based on the constrained Delaunay triangulation is presented. First, according to the different machining methods between the real bottom plane and the flat rib as well as the similar geometric characters of these two features, the concept of generalized bottom plane is introduced to represent the real bottom plane and the flat rib. Moreover, a representation model of the rib feature is established for further recognition and construction. Second, the constrained Delaunay triangulation method is adopted to decompose the generalized bottom plane, recognize and distinguish it as the flat rib or bottom plane, and then extract the medial axis of the flat rib. Finally, the flat rib is divided as per the medial axis while the declining rib is recognized and constructed as a sub-feature of the generalized bottom plane. The validity and efficiency of this algorithm have been verified through examples.

Key words: NC programming, feature recognition, aircraft structural part, rib, Delaunay triangulation

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