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Collision-free workspace of parallel mechanisms based on an interval analysis approach

Published online by Cambridge University Press:  22 August 2016

MohammadHadi FarzanehKaloorazi*
Affiliation:
CoRo, École de Technologie Supérieure, Montréal, Quebec, Canada
Mehdi Tale Masouleh
Affiliation:
Human-Robot Interaction Laboratory, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran. E-mail: m.t.masouleh@ut.ac.ir
Stéphane Caro
Affiliation:
CNRS-IRCCyN, UMR 6597, 1 rue de la Noë, 44321 Nantes, France. E-mail: stephane.caro@irccyn.ec-nantes.fr
*
*Corresponding author. E-mail: hamidfarzane88@gmail.com
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Summary

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This paper proposes an interval-based approach in order to obtain the obstacle-free workspace of parallel mechanisms containing one prismatic actuated joint per limb, which connects the base to the end-effector. This approach is represented through two cases studies, namely a 3-RPR planar parallel mechanism and the so-called 6-DOF Gough–Stewart platform. Three main features of the obstacle-free workspace are taken into account: mechanical stroke of actuators, collision between limbs and obstacles and limb interference. In this paper, a circle(planar case)/spherical(spatial case) shaped obstacle is considered and its mechanical interference with limbs and edges of the end-effector is analyzed. It should be noted that considering a circle/spherical shape would not degrade the generality of the problem, since any kind of obstacle could be replaced by its circumscribed circle/sphere. Two illustrative examples are given to highlight the contributions of the paper.

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Type
Articles
Copyright
Copyright © Cambridge University Press 2016