支持网络化协同设计CAD关键技术与实现方法分析

1、支持网络化协同设计CAD的关键技术与实现方法分析1网络化协同cad设计的两大问题一、设计的冲突二、文件的传输速度2解决方法对于问题一 A Study on Collaborative Design Considering Features of Design利用数据包络分析方法（DEA）计算设计的效率和权衡的方法(STM)发现并解决冲突。3DEA STM 在约束条件下，使效率达到最大4解决方法对于问题二Geometric Simplification to Stream 3D Models for Collaborative Product Design利用三维流技术进行模型的简化、传输及还原

2、5解决方法对于问题二三维流技术6实现流技术的关键算法三维模型的几何简化在该文献中，提出了一种新的简化算法，来确定死亡顶点及崩溃边、崩溃方向7顶点分类8(the non-simple vertex here is either an interior edge one or a corner one).9Criterion 1A for exampleShortest edge -决定崩溃崩溃方向-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.10三维模型的几何简化11Simplification Framework简

4、化框架121314最小几何误差 最大几何误差15参考文献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