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

Abstract: 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 topology 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.

Key words: engineering drawings, view model, similarity evaluation, reuse retrieval, computer aided design model