关键词: 装配公差类型, 自动生成, 表示模型, 空间关系, 本体

Abstract:

To reduce the uncertainty in assembly tolerance design and to satisfy the requirements of tolerance information passing through heterogeneous systems in collaborative environment, ontology technology was introduced to the research of automatic generation of assembly tolerance types. First of all, an assembly tolerance representation model based on spatial relations was constructed. The constraint relations in each layer of the model were represented by OWL (Web ontology language) assertions. Next, by extracting the concepts and relations in the constructed model, an ontology for assembly tolerance representation was constructed and implemented. Based on the implemented ontology and mapping relations among spatial relations and assembly tolerance types, the rules for generating assembly tolerance types were defined by using SWRL (semantic Web rule language). Furthermore, a knowledge base system for generating optional assembly tolerance types was constructed based on the implemented ontology and defined rules. Based on this, an algorithm for automatic generating assembly tolerance types was designed. Finally, the effectiveness of the generation algorithm was demonstrated by a practical example.

Key words: assembly tolerance type, automatic generation, representation model, spatial relation, ontology