用户自定义特征库分类模型研究

Research on classification model in user-defined feature library

针对传统CAD系统中用户自定义特征库分类不支持特征共享的问题,提出了基于有向无环图的用户自定义特征库分类模型。通过将特征信息作为公共子节点附加到分类树中形成有向无环图,实现了特征的分类和共享,并利用中性的XML文档实现了模型的存储,提高了模型的移植性;最后给出了模型的建立过程。实例表明,该模型简单灵活,极大地提高了用户自定义特征库的分类和共享能力。

This paper proposed a classification model of user-defined feature library based on directed acyclic graph in order to solve the problem that classification of user-defined feature library did not support user-defined feature sharing in traditional CAD system. In the model,implemented classification and sharing of feature through a directed acyclic graph formed by attaching feature information as common sub-node into classification tree,and stored the model by neutral XML document in order to improve the portability of model,at last provided the process of establishing the model. Instance shows that the model is simple and flexible,classification and sharing capabilities of user-defined feature library are improved extremely.