Identification and Classification of Multi-Degree-of-Freedom and Multi-Loop Mechanisms

[+] Author and Article Information
Tyng Liu, Chung-Huang Yu

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

J. Mech. Des 117(1), 104-111 (Mar 01, 1995) (8 pages) doi:10.1115/1.2826092 History: Received October 01, 1992; Revised September 01, 1993; Online January 25, 2008


This study concerns the degree-of-freedom, the arrangements of input and the type of mobility of multi-loop, multi-degree-of-freedom mechanisms. Firstly, “basic loops” are introduced, and a systematic scheme for identifying the actual degree-of-freedom of mechanisms is developed. The input, then, can be properly deployed, such that the mechanism has a totally constrained motion. Lastly, based on the input deployment, the mobility of mechanisms is classifed and identified into three types: total, partial and fractionated mobility. The procedure has been automated, and the atlas of all possible arrangements of input of up to eight-link planar mechanisms with only revolute joints is presented. The systematic method is helpful for the structural synthesis of multi-degree-of-freedom and multi-loop mechanisms, and for exploring their potential industrial applications.

Copyright © 1995 by The American Society of Mechanical Engineers
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