Analyses and Improvement of Case-Based Decision Model of Product Conceptual Design

The present article describes a case-based decision model at the background of product conceptual design. The notion of the bounded rationality in the process of estimating similarity is used for proposing an improved similarity algorithm based on a distance threshold. The general algorithm and the improved algorithm are used to analyze the similarity between new target and finished products for conceptual design of circular gear reducers. An example validates the improved algorithm can effectively exclude useless cases.