• CN:11-2187/TH
  • ISSN:0577-6686

›› 2008, Vol. 44 ›› Issue (9): 205-208.

• 论文 • 上一篇    下一篇



  1. 吉林大学材料科学与工程学院;北华大学交通建筑工程学院;大连理工大学汽车工程学院
  • 发布日期:2008-09-15

Normal Consistent Arithmetic of Surface Based on Topology of Grid Edge

LIU Ruijun;HU Ping;SONG Yuquan;GUO Wei   

  1. School of Materials Science and Engineering, Jilin University College of Transportation and Civil Engineering, Beihua University School of Automotive Engineering, Dalian University of Technology
  • Published:2008-09-15

摘要: 提出基于曲面网格重构拓扑关系的自动翻法线算法,该算法的设计思想源于ACIS曲面缝合和拓扑重构中有向边的概念,通过调整相邻单元公共边的节点,使相邻单元公共边所属的有向边方向相反,实现曲面单元法向快速、准确一致化。通过对曲面上的裂纹、孤立单元、孤立单元群和重叠单元等缺陷进行有效处理,具有很好的适应性。这种算法能够准确完成冲压工具单元法向的一致操作,可为后续板料成形数值模拟中的接触算法提供前提条件。应用算法对复杂汽车覆盖件进行自动翻法线操作,结果验证了算法的有效性。

关键词: 翻法线, 曲面, 拓扑重构, 有向边

Abstract: The algorithm of automatically reversing normal which is based on topology after surface mesh repairing is presented. This algorithm of automatically reversing normal comes from the concept of coedge during ACIS’s surface healing and topology repairing is proposed. This algorithm can rapidly and accurately achieve the consistency of surface element normals by adjusting nodes of common edges of neighboring elements to make the two coedges belonging to the same common edge have the opposite directions. This algorithm has good adaptability by effectively dealing with faults such as crack between elements, isolated element(s) and element group(s), overlap element(s). This algorithm can accurately achieve consistency mesh normal of punch tools and provide necessary precondition for the follow contact algorithm before numerical simulation technology of sheet forming process. The validity is confirmed by results which the complex automobile panels normal are automatically reversed.

Key words: Coedge, Repairing topology, Reverse normal, Surface