关键词: 关键结构, 装配体检索, 模块化设计

Abstract: Aiming at the problem that classification retrieval method was not available for assembly bodies,an assembly body retrieval method oriented to key structures was presented.The assembly body was divided by using assembly certainty and the concepts of connection structure,kinematic pair structure and assembly body structure were proposed.According to the fact that an assembly body structure probably contained minor ones,it could be further decomposed into basic assembly body structures and assembly body structure units.The definition,classification,decomposition and discrimination method of assembly body structure unit was proposed.Assembly body structures and assembly body structure units are used as the key structure of assembly bodies,while assembly structure models of assembly bodies were used as the feature to appraise the similarity of the key structure of assembly bodies.On the basis of the text information retrieval method,the inverted index of key structure was set up.Boolean model of key structure was used to retrieve assembly body,and the substructures of central parts and hierarchical topology model were proposed to realize computer automatic recognition and efficient indexing of units.The effectiveness of proposed method was verified by valve stem assembly.

Key words: key structure, assembly body retrieval, modular design