关键词: 适应性修改, 可拓集合, 物元模型, 基元有向图, 综合传导度

Abstract: For lack of effective analysis method for effect conduction process of modifying operation in product internal units,which led to the indeterminacy of prior modified object,a recognition method of product adaptive modification unit was proposed.A quantified matching model between functional requirements and case functions was established,and the matched results were divided into three domains with extension set.The underlying mapping relation from functions to structures of product was obtained through vertical decomposition with multi-layer Function-Behavior-Structure(FBS) method.The parts of product were refined to feature layer,and the matter-element expression models of parts and their features were expressed.On this basis,basic-element digraph with part features as nodes was constructed,and the comprehensive conductivity of feature nodes in basic-element digraph could be calculated to recognize product modification unit.The effectiveness of the proposed method was verified by applying to a snail tail cutting machine.

Key words: adaptive modification, extension set, matter-element model, basic-element digraph, comprehensive conductivity