Abstract: Design history is helpful in product structure design.It studies the representation and reuse of product design knowledge,and presents a case-based knowledge reuse method in structure design of product components.First,according to the research based on the different attributes of similarity calculation in the case retrieval,the hybrid similarity calculation models for crisp and fuzzy attribute type demands are structured.Then,in the study of the weight coefficients,the objective and subjective weights methods are integrated,which overcomes the limitations of a single weighting method.Subsequently,the global similarity was established by combining the hybrid similarity measure and the synthesis weight method.Finally,a case study of the missile is introduced to illustrate the use of the proposed method.The results show that the hybrid similarity and the distribution of weight coefficients could improve the accuracy and reliability of case retrieval.

Key words: case-based reasoning, knowledge reuse, hybrid similarity calculation, attribute weight