1、支持網絡化協同設計CAD的關鍵技術與實現方法分析1網絡化協同cad設計的兩大問題一、設計的沖突二、文件的傳輸速度2解決方法對于問題一 A Study on Collaborative Design Considering Features of Design利用數據包絡分析方法（DEA）計算設計的效率和權衡的方法(STM)發現并解決沖突。3DEA STM 在約束條件下，使效率達到最大4解決方法對于問題二Geometric Simplification to Stream 3D Models for Collaborative Product Design利用三維流技術進行模型的簡化、傳輸及還原

2、5解決方法對于問題二三維流技術6實現流技術的關鍵算法三維模型的幾何簡化在該文獻中，提出了一種新的簡化算法，來確定死亡頂點及崩潰邊、崩潰方向7頂點分類8(the non-simple vertex here is either an interior edge one or a corner one).9Criterion 1A for exampleShortest edge -決定崩潰崩潰方向-Error Function: Ei = | Ai A0 | where i = 1 or 2 (1)Where A0 refers to the surface area of all triang

3、les sharing at least one of the vertices of the selected edge, and Ai refers to the surface area of all triangles sharing the final vertex after vertex i is collapsed. Hence, the edge will be collapsed in the direction that will produce the smallest error value.10三維模型的幾何簡化11Simplification Framework簡

4、化框架121314最小幾何誤差 最大幾何誤差15參考文獻A Study on Collaborative Design Considering Features of DesignTomoyuki Miyashita and Hiroshi YamakawaASME Conf. Proc. IDETC/CIE2002 (2002)Volume 2: 28th Design Automation ConferenceGeometric Simplification to Stream 3D Models for Collaborative Product DesignW. D. Li, W. F. Lu, and Y. L. CaiASME Conf. Proc. IDETC/CIE2005 (2005)Volume 3: 25th Co