基于B—rep模型的特征CAD系统

提出了一种特征分离表达模式，将几何信息与特征参数信息分别表达在Ｂ－ｒｅｐ模型和参数化数据模型中，但又互相关联，可较为完备地表达零件各层次信息。讨论了特征关系的表达策略，提出了特征设计中有效性检验的必要性和算法。

A Feature-based CAD System based on B-rep Solid Model

This paper proposes a separated representation schema. The geometric/topologic information and feature parametric information are separately represented in geometric model and parametric model, and these two models are connected each other, providing enough information for CAD, CAPP and CAM systems. The representation of feature relationships is discussed and the necessity and algorithm of feature validation are also proposed.