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A General Formula of Degree of Freedom for Parallel Mechanisms

[+] Author Affiliations
Ting-Li Yang, Dun-Jin Sun

SINOPIC Jinling Petrochemical Corporation, Nanjing, China

Paper No. DETC2008-49077, pp. 1379-1390; 12 pages
doi:10.1115/DETC2008-49077
From:
  • ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 2: 32nd Mechanisms and Robotics Conference, Parts A and B
  • Brooklyn, New York, USA, August 3–6, 2008
  • Conference Sponsors: Design Engineering Division and Computers in Engineering Division
  • ISBN: 978-0-7918-4326-0 | eISBN: 0-7918-3831-5
  • Copyright © 2008 by ASME

abstract

In this paper, a general formula of degree of freedom (DOF) for parallel mechanisms has been presented which could provide the full-cycle DOF. The key parameters in the formula can be determined via the position and orientation characteristic equations and their symbolic operations of serial and parallel mechanisms proposed by author and the symbolic operation is simple. It is totally different from the methods based on screw theory and based on displacement subgroup. The formula has been used for selection of driving pairs and determination of idle pairs. The formula may also be used for determining the DOF of other multi-loop mechanisms besides parallel mechanisms.

Copyright © 2008 by ASME

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