基于特征CAD中的特征定位关系及算法

THE ALGORITHM AND RELATIONSHIP OF FEATURES IN FEATURE-BASED CAD SYSTEM

提出了以实体模型、测量要素、定形尺寸、定位尺寸、行为约束为构造成份的特征模型；为了捕获ＣＡＤ中特征之间的相互定位关系，建立了特征父子关系算子结构；提出了特征父子关系图的概念用于表达零件模型；给出了访问父子关系图的算法，讨论了算法实现的例子。

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