关键词: 方案设计, 距离测度, 模糊数, 综合评价

Abstract: A new evaluation method to kinematic scheme of mechanical system is presented by means of a fuzzy distance measure. Taking the garment machinery in light industry as an example, the factor sets restricted in the conceptual design are established, and the hierarchy relationship among them is set up in terms of usability, dynamic performance as well as manu-facturability. And then the evaluation criterion is proposed for all basic mechanical units. The ratings of various alternatives and their importance weights under different criteria are de-scribed in linguistic terms which are represented by the trian-gular fuzzy numbers. Secondly, the standard membership func-tion is set up for the evaluate factors and their importance weights. Based on the factor hierarchy relationship, a three-grade fuzzy comprehensive evaluation model is set up for solving the problem, which characters multi-factors, multi-hierarchy features, multi-experts involving as well as various units composing. The concept of fuzzy distance meas-ure is introduced to decide the final ranking of alternatives. Therefore, a comprehensive evaluation algorithm is proposed. Finally, an example is carried out to demonstrate the validation of the new method.

Key words: Comprehensive evaluation, Conceptual design, Distance measure, Fuzzy numbers