摘要
传统的基于历程的特征造型中,容易出现设计意图和设计结果前后不一致的问题,为此文中采取了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。这种方法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,在现有的开发平台上和CAD系统中具有一定的可行性。
In this paper,a new structure,Feature Dependency Graph（FDG）,is 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 makes the time for re-executing can reduce much,Furthermore,the relations among features persist forever,not associated with the constructive sequence,The paper analyzes and defines the dependency relation and proposes the structure of FDG expressed by the data structure of graph,then offers the arithmetic of the manipulating actions on FDG,eonsisting of inserting,modifying and deleting for features and constraints.
出处
《机械工程师》
2005年第10期53-56,共4页
Mechanical Engineer
基金
国家自然科学基金资助项目(60173055)
关键词
语义特征
特征造型
依赖图
semantic feature
feature modeling
dependency graph
