Abstract: In consideration of the characteristics of a huge number and multifarious assembly process knowledge for some aerospace enterprise, a classification framework of process knowledge was established after collating the knowledge of assembly process. By analyzing the modeling methods of assembly process knowledge based on ontology, the ontology model of assembly process was constructed and encoded by Ontology Web Language (OWL). After that, in order to calculate semantic similarity among different concept of the domain ontology, a semantic similarity algorithm based on the ontology was put forward, which integrated semantic similarity based on distance and semantic similarity based on attribute, and the effectiveness of its result was verified through a calculation to some fragment of the process knowledge. At last, the knowledge model and the semantic similarity algorithm were applied to the knowledge base of the assembly process, which implemented the orderly management and sharing and reuse of assembly process knowledge for a type product.

Key words: aerospace products, assembly process knowledge, ontology, semantic similarity