摘要
为了对工程图的局部信息进行有效检索,在正投影理论和投影规则的基础上,以拓扑层次树为评价模型构建了工程图重用检索系统。通过引入投影的视图模型概念,以反映产品某一基本视图投影的形状和几何属性的投影域获取为基础,构建了反映投影域空间位置关系的拓扑关系邻接矩阵。通过建立冗余包含关联对及单一包含关联对,达到对空间包含关系的聚合。以所建立基本视图中的投影域的拓扑位置关系为基础,构建体现投影域空间位置关系的拓扑层次树。以拓扑层次树为评价模型,对树的层间和层内相似性进行评价,达到对拓扑层次树进行整体相似评价的目的。实验结果表明,该检索方法具有较好的查全率和查准率,能有效支撑工程图的相似性评价。
To retrieve the local information of engineering drawing effectively, based on the orthographic projection theory and the projective rules, the reuse retrieval system for engineering drawings was constructed by taking the to- pology hierarchical tree as evaluating model. Through introducing the view model concept of projective drawing, the topological relation adjacency matrix representing the space position relationship of projective region was constructed based on the projective region acquirement of one basic view projection＇s shape and geometrical attribute. Through building the associative pairs of redundant relations and the associative pairs of single relations, the space inclusion relationship was aggregated. Based on topological position relationship among the projective regions in established basic view, the topological hierarchy tree of space position relationship was built. By taking the topological hierarchy tree as the evaluating model, the interlamination similarity and the intraformational similarity were evaluated, and the entire similarity of topology hierarchy tree was evaluated. Experimental results showed that the retrieval method had better recall and precision, and could effectively support and accomplish the similarity evaluation for engineering drawings.
出处
《计算机集成制造系统》
EI
CSCD
北大核心
2013年第8期1975-1983,共9页
Computer Integrated Manufacturing Systems
基金
国家自然科学基金资助项目(51075336)
陕西省教育厅专项科研基金资助项目(12JK0695)~~
关键词
工程图
视图模型
相似性评价
重用检索
计算机辅助设计模型
engineering drawings~ view model~ similarity evaluation
reuse retrieval~ computer aided design model
