Comparative Study of Representation Structures for Modeling Function and Behavior of Mechanical Devices

Abstract

Engineering design is focussed on the development of artifacts and systems to satisfy specified functions. Current CAD systems provide little support integrating the modeling of the function, behavior, and form of designed artifacts throughout the design process. The focus of this paper is to investigate four representations for use in function representation for conceptual design, embodiment design, and design for manufacturing. These four representations include: Graph Grammars, Exemplars, Bond Graphs, and Function Converters. It is shown that different representations are more suited for different phases of design depending upon required design tasks and for representing different types of function knowledge. Finally, an approach for integration of these representations is proposed, synthesizing a hybrid representation based upon the strengths of the four identified strategies.

Function modeling using the system state flow diagram

“…There are also two special types of vertices called junctions that represent series and parallel connection. Bond graphs support the analysis of complex systems across disciplines (Summers et al, 2001). Triengo and Bos (1985) note that it is difficult to model mechanical systems, while Umeda et al (1990) pointed out that the model focuses on structure and behavior of a system, but not on its functions.…”

Design for Manufacture and Integrated Manufacturability Evaluation System

“…--DfM is the approach to design of mechanical parts, components, and systems that addresses the manufacturability issues during the early stages of conceptual and embodiment design with tradeoffs performed between design and manufacturing objectives [5] .…”