关键词: 模糊综合决策, 阈值, 知识表示, 机械设计

Abstract: It is widely agreed that an important problem in AI is the representation of commonsense knowledge. combined withthe study on the mechanical design expert system, a new knowledge representation method used to select the material ofspare parts based fuzzy decisions is presented in this paper. With the quantification of the knowledge and experienceof designing engineers, the expert system with the aid of this method can make decisions to select the most suitable materi-al after making simple numerical calculation and judgement of threshold value. It is indicated that the new method has leftout the complex inference and raised the design efficiency.

Key words: fuzzy decision, threshold value, knowledge representation, mechanical design