Conceptual Design Knowledge Retrieval, Reuse and Innovation Based on Case and Constraint

This paper researches on knowledge retrieval, reuse and innovation in product conceptual design. First, userpsilas design requirement is translated and decomposed using function-method tree. Second, design case and constraint are used to describe a two-layer process of knowledge retrieval. One is to get the similarity of case function through matching function unitspsila attribute values that is weighted. Another, a similarity constraint retrieval algorithm is proposed for similarity case retrieval. And then, Patch case is defined. Patch case for userpsilas design requirement is attained through a patch algorithm. Knowledge reuse and innovation is based on patch case. At last, system framework and application are constructed to explain this process.