基于特征依赖图的语义特征造型建模的研究

针对传统的基于历程的特征造型中设计意图和设计结果容易前后不一致问题,采取基于完全双向语义约束的变量化特征造型,并提出用特征依赖图的数据模型来保存和维护设计中的各种特征信息及其之间的关系。它的形成是基于特征间的各种依赖关系而不是基于特征创建的先后顺序,并且根据依赖关系完成特征实体和约束的添加,编辑,删除等操作。使得特征信息随时根据相关特征信息协调变化,特征语义能够始终保持一致。最后展示了一个实例。

Research of Feature Dependent Graph on Semantic Feature Modeling

A new structure, Feature Dependency Graph (FDG), was suggested to preserve feature information and relations among all features. The unique advantage of it is that it organizes the features by the dependency relation, instead of the constructive sequence. According to FDG, it is easy to found the related features set for any feature, and the re-evaluation can only confine to the related set, as making the time for re-executing can reduce much. Furthermore, the relations among features persist forever,not associated with the constructive sequence. The dependency relation was analyzed and defined through the data structure of graph, and then the arithmetic of the manipulating actions on FDG was offered, consisting of inserting, modifying and deleting features and constraints. An example was introduced.