关键词: 层次化信息, 产品特征, 工程图, 检索, CAD模型

Abstract: According to the hierarchical properties implicated in projective view of engineering drawings,the hierarchical information model of artifact was put forward.In the light of the projective principle and representative rules,the feature information implicating in engineering drawings of artifact were classified into three levels of feature view model,feature function model and feature semantic model,and the different levels'feature connotation were expressed by each level.The acquiring algorithm for feature view model based on the associative relationship of location and feature constrain was designed.The aggregating rules and aggregating algorithms for feature function model on the basis of feature view model were produced,and the aggregating algorithm for feature function model was accomplished.In accordance with the internal mechanism of engineering semantic implicated in engineering drawings,the feature semantic model was constructed,and its feature model was defined.The feature semantic ontology was built,and its acquiring algorithm was implemented.Through the experimentation,the feature information of each level could be gained,and the artifact hierarchical model was applied to the retrieval for engineering drawings based on the feature information.

Key words: hierarchical information, artifact feature, engineering drawings, retrieval, CAD model