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Supporting conceptual design based on the function-behavior-state modeler

Published online by Cambridge University Press:  27 February 2009


Yasushi Umeda
Affiliation:
Department of Precision Machinery Engineering, Graduate School of Engineering, the University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113, Japan.
Masaki Ishii
Affiliation:
Department of Precision Machinery Engineering, Graduate School of Engineering, the University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113, Japan.
Masaharu Yoshioka
Affiliation:
Department of Precision Machinery Engineering, Graduate School of Engineering, the University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113, Japan.
Yoshiki Shimomura
Affiliation:
Mita Industrial Co., Ltd., Tamatsukuri 1-2-28, Chuo-ku, Osaka, Japan
Tetsuo Tomiyama
Affiliation:
Department of Precision Machinery Engineering, Graduate School of Engineering, the University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113, Japan.

Abstract

The relative significance of conceptual design to basic design or detail design is widely recognized, due to its influential roles in determining the product's fundamental features and development costs. Although there are some general methodologies dealing with functions in design, virtually no commercial CAD systems can support functional design, in particular so-called synthetic phase of design. Supporting the synthetic phase of conceptual design is one of the crucial issues of CAD systems with function modeling capabilities. In this paper, we propose a computer tool called a Function-Behavior-State (FBS) Modeler to support functional design not only in the analytical phase but also in the synthetic phase. To do so, the functional decomposition knowledge and physical features in the knowledge base of the modeler, and a subsystem Qualitative Process Abduction System (QPAS) play crucial roles. Modeling scheme of function in relation with behavior and structure and design process for conceptual design in the FBS Modeler are described. The advantages of the FBS Modeler are demonstrated by presenting two examples; namely, an experiment in which designers used this tool and the design of functionally redundant machines, which is a new design methodology for highly reliable machines, as its application.


Type
Articles
Copyright
Copyright © Cambridge University Press 1996

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