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RESEARCH PAPERS: Mechanisms Papers

Design and Analysis of Momentary-Dwell Mechanisms

[+] Author and Article Information
A. C. Wang

Equipment Development Division, Aluminum Company of America, Alcoa Technical Center, Alcoa Center, Pa 15069

T. W. Lee

Department of Mechanical Engineering, State University of New York at Stony Brook, Stony Brook, NY 11794

J. Mech., Trans., and Automation 107(1), 131-140 (Mar 01, 1985) (10 pages) doi:10.1115/1.3258676 History: Received July 12, 1984; Online November 19, 2009

Abstract

This paper presents a general theory for the dwell characteristics and for the synthesis of momentary-dwell mechanisms. Dwell conditions are obtained from the simultaneous solution of a set of equations derived recursively through the differentiations of a general form of displacement equation. A general synthesis approach is presented. It involves the use of analytical solutions of the lower-order dwell criteria as initial estimates and the development of a computer-aided procedure to subsequently readjust the mechanism proportions by heuristic optimization. The proportions thus obtained represent tradeoffs among higher orders of dwell and various prescribed kinematic and dynamic characteristics. For most practical purposes, such a solution is useful and acceptable. The coupler-dwell mechanism is used to illustrate the theory and approach. In particular, two mechanisms design problems are investigated. One deals with the kinematic synthesis of a six-bar coupler mechanism with shockless dwell and with prescribed unlimited crank rotations as well as optimum transmission; and the other concerns the design of a chain-linkage drive, including an analysis on the effect of the chain dynamics.

Copyright © 1985 by ASME
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