Abstract:

In a Case-Based Reasoning(CBR)system,the case learning makes the case base expand quickly,which results in the redundancy of the case base and the decrease of the searching eficiency.Thus,the system function is weakened.To SO]Ve this problem.this paper analyzes the traditional methods of case base maintenance and proposes a case-saving strategy based on case cover capability to limit the infinite expanding of the case base.Moreover,a case fitness function is defined to describe the subsistence of a case in the base,by which some cases with small fitness degree aye deleted.Therefore,the storage structure of the case base is optimized and the system performance is improved.A CAD system of punch die design is finally presented to verify the correctness and the rationality of the proposed method.

Key words: case-based reasoning, case base maintenance, case cover capability, case fitness degree, punch die