面向协同设计的CAD模型层次表达与渐进传输  

Hierarchy Representation and Progressive Transmission of CAD Model for Collaborative Design

作　　者：刘俊[1] 王启富[1] 刘云华[1] 陈立平[1] 

机构地区：[1]华中科技大学国家CAD支撑软件工程技术研究中心,湖北武汉430074

出　　处：《工程图学学报》2006年第6期7-14,共8页Journal of Engineering Graphics

基　　金：国家自然科学基金资助项目(5027506060573178);国家"八六三"高技术研究发展计划资助项目(2002AA4Z3370)

摘　　要：提出一种面向协同设计的基于边界表达的层次表达模型,利用该模型对传统CAD产品数据模型的几何、拓扑、特征进行重组。研究层次表达模型中曲线、曲面简化算法,该算法采用最小二乘逼近减少自由曲线、曲面控制点数目,达到减少模型数据量的目的。实现基于精确几何描述的CAD产品数据模型的层次表达、简化及渐进传输。实验结果表明,该模型及算法具有数据量小、网络传输快速等优点。A hierarchy representation model （HRM） based on boundary representation （B-rep） is presented for collaborative design. Reconstruct the geometry, topology and feature of traditional CAD product data model based on HRM. A simplification algorithm of curve and surface is studied. This algorithm use least-square approximation to reduce the control point number of free form curve and surface, thus achieve the purpose of reducing data quantity of CAD model. The hierarchy representation, simplification and progressive transmission of CAD product data model based on accurate geometry representation is realized. Experimental results show that this model and algorithm can achieve less data quantity and transmit faster through network.

关 键 词：计算机应用 协同设计 层次表达模型 曲线曲面简化 渐进传输 CAD产品模型 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]