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A new approach to determine the maximal singularity-free zone of 3-RPR planar parallel manipulator

Published online by Cambridge University Press:  05 December 2011

G. Abbasnejad ,
H. M. Daniali  and
S. M. Kazemi
G. Abbasnejad
Affiliation:
Department of Mechanical Engineering, Babol University of Technology, P.O. Box 484, Babol, Iran
H. M. Daniali*
Affiliation:
Department of Mechanical Engineering, Babol University of Technology, P.O. Box 484, Babol, Iran
S. M. Kazemi
Affiliation:
Department of Mechanical Engineering, Babol University of Technology, P.O. Box 484, Babol, Iran
*
*Corresponding author. E-mail: mohammadi@nit.ac.ir
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Summary

This paper presents a new algorithm to find the singularity-free cylindrical workspace of parallel manipulators. Because of the limited workspace of parallel manipulators cluttered with different types of singularities, a simple and robust technique to determine continuous singularity-free zones in the workspace of parallel manipulators is required. Here, the largest singularity-free cylinder within the workspace for any prescribed orientation ranging around a reference orientation angle of moving platform is determined. To this end, Particle Swarm Optimization is utilized to find the closest point on the singularity surface to the axis of the cylinder. By implementing the algorithm on 3-RPR planar parallel manipulator, the results show that this algorithm improves the efficiency and leads to significantly larger singularity-free workspace than those reported earlier.

Keywords

Parallel manipulatorWorkspaceSingularity-freeOptimizationPSO
Type
Articles
Information
Robotica , Volume 30 , Issue 6 , October 2012 , pp. 1005 - 1012
Copyright
Copyright © Cambridge University Press 2011

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