for its conceptual design

ZHAO Lin，He Hua-bo，DENG Yi-min

（The Faculty of Mechanical Engineering and Mechanics，Ningbo University，Ningbo 315211，China）

Abstract：Aiming at the similarity in mechanical system with variable functions which has compact structure，the expression form of similarity and similarity measurement model was studied，and the relation in time and space of the function，behavior and structure of mechanical system was researched. The systematic framework model was developed by basing on the“functional-behavior-structure” design model and the similarity theory. Function sequence structure and behavior sequence structure were defined，and their relationships were analyzed，to illustrate the similarity of the conceptual design. Finally the specific steps of developing a similar model were elaborated. The results show that the instance model comply with the cognitive process of design，can measure the similarity of different design layers. The model can be used to describe the similarity of variable-function mechanical system for its conceptual design.

Key words：variable function；mechanical system；conceptual design；similarity model