基于特征依赖图的仪器仪表特征造型建模

The Research on Feature Dependent Graph in the Feature Modeling of Instrument and Meter

仪器仪表计算机辅助设计系统中因器件精密关系复杂而导致在建模的过程当中容易出现不能正确维护设计者的意图的缺陷,本文针对这个问题,采用变量化特征造型方法设计系统,并提出用特征依赖图的数据模型来组织各种仪器仪表特征,以正确无误实现设计者的思想。特征信息用各种完全语义约束来保存和维护,而且特征的语义约束能够双向保持,从而保证了语义的完整性和双向一致性,仪器仪表的可靠性设计,维修性设计,现代化设计在一定的程度上得到了极大的提高。

Feature Dependency Graph （FDG） is suggested to preserve the feature informarion and relations among all features. The unique advantage 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 makes the time for re-executing can reduce much. The relations among features persist forever and are not associated with the constructive sequence. Analyze and define the dependency relation, propose the structure of FDG expressed by the data structure of grapy in programming language C＋＋, offer the arithmetic of the manipulating actions on FDG, and consist of inserting, modifying and deleting for features and constraints.