A Methodology for Conceptual Design of Mechanisms by Parsing Design Specifications

[+] Author and Article Information
Dar-Zen Chen1

Department of Mechanical Engineering,  National Taiwan University, Taipei, Taiwan 10660, Republic of Chinadzchen@ntu.edu.tw

Wei-Ming Pai

Department of Mechanical Engineering,  National Taiwan University, Taipei, Taiwan 10660, Republic of China


Corresponding author.

J. Mech. Des 127(6), 1039-1044 (Mar 08, 2005) (6 pages) doi:10.1115/1.2044767 History: Received June 03, 2004; Revised March 08, 2005

In this paper, design specifications for the conceptual design of mechanisms are parsed into three coherent categories: functional requirements, structural requirements, and design constraints. Based on functional requirements, the functioning kinematic chain of a mechanism can be constructed by connecting the functioning links accordingly. From structural requirements, admissible kinematic structures are searched from the existing atlases of kinematic structures. Those admissible kinematic structures, which comprise at least one segment with the same characteristics of the functioning kinematic chain, are identified as compatible kinematic structures. Thus, feasible mechanisms that fulfill design specifications can be yielded by labeling joints in the compatible kinematic structures subject to design constraints. With this methodology, classified design specifications are used to guide designer through various stages of the conceptual design process in a systematic manner. The creation of the variable-stroke engine mechanism [Freudenstein, F., Maki, E. R., 1983, “Development of an Optimum Variable-Stroke Internal-Combustion Engine Mechanism From the Viewpoint of Kinematic Structure  ,” ASME J. Mech., Trans., Automat., Des., Vol. 105, pp. 259–267] is used as an illustrative example.

Copyright © 2005 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 4

(a) Identification of the functioning kinematic chain; (b) Labeling of unspecified joints

Grahic Jump Location
Figure 1

Conceptual design approach by Freudenstein and Maki (2)

Grahic Jump Location
Figure 2

Proposed conceptual design approach

Grahic Jump Location
Figure 3

Construction of the functioning kinematic chain



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