摘要
本文分析了并行工程的特点以及当前机械ＣＡＤ系统的现状，尝试建立产品的装配模型以支持现有ＣＡＤ系统进行并行设计。根据并行工程对ＣＡＤ系统提出的新要求，建立了描述机械产品的层次关系、装配关系以及参数约束关系数据模型，并初步讨论了应用装配模型的ＣＡＤ系统具有的基本功能。
The characteristics of Concurrent Engineering and the status of existing mechanical CAD systems are discussed at the beginning.In order to support the Concurrent Engineering design proced ure, a STEP based assembly model is presented. The data model,which can describe the hierachical, assembly and parameter relations among the parts and components in a mechanical product, is built. Also the main functions that the assemby model supported CAD system can provide are discussed.
