特征模型中的特征父子关系图及其应用

The Parent Child Graph for Parametric and Feature Based Design

提出的特征模型由五块构成：实体模型、测量要素、定形尺寸、定位尺寸、行为约束．建立了特征父子关系算子以便捕捉特征间的依存关系．提出了父子关系图的概念以便表达基于特征的零件模型；给出了访问父子关系图的算法以便实现参数化特征设计．介绍了以本文思想为基础开发的一个应用系统的特点．

The feature model presented here consists of five components:solid model,measure elements,size dimensions,and location dimensions as well as constrains behaviour.The PCO(Parent Child Operator) is proposed for capturing the dependency between features.A PCG(Parent Child Graph) is presented for the representation of the feature based parts model.The algorithm is given for the accessing to PCG.