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Optimal design of a new redundant spherical parallel manipulator with an unlimited self-rotation capability

Published online by Cambridge University Press:  30 October 2024

Chaima Lahdiri ,
Houssem Saafi Open the ORCID record for Houssem Saafi [Opens in a new window] ,
Abdelfattah Mlika Open the ORCID record for Abdelfattah Mlika [Opens in a new window]  and
Med Amine Laribi Open the ORCID record for Med Amine Laribi [Opens in a new window]
Chaima Lahdiri
Affiliation:
Mechanical Laboratory of Sousse, University of Sousse, Sousse, Tunisia.
Houssem Saafi*
Affiliation:
Mechanical Laboratory of Sousse, University of Sousse, Sousse, Tunisia. Preparatory institute for engineering studies of Gafsa, University of Gafsa, Gafsa, Tunisia.
Abdelfattah Mlika
Affiliation:
Mechanical Laboratory of Sousse, University of Sousse, Sousse, Tunisia.
Med Amine Laribi
Affiliation:
Department of GMSC, Pprime Institute, CNRS– University of Poitiers, ENSMA– UPR 3346, Poitiers, France
*
Corresponding author: Houssem Saafi; Email: houssem.saafi@gmail.com
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Abstract

This paper deals with the optimization of a new redundant spherical parallel manipulator (New SPM). This manipulator consists of two spherical five-bar mechanisms connected by the end-effector, providing three degrees of freedom, and has an unlimited self-rotation capability. Three optimization procedures based on the genetic algorithm method were carried out to improve the dexterity of the New SPM. The first and the second optimizations were applied to a symmetric New SPM structure, while the third was applied to an asymmetric New SPM structure. In both cases, the optimization was performed using an objective function defined by the quadratic sum of link angles. In addition, certain criteria and constraints were implemented. The obtained results demonstrate significant improvements in the dexterity of the New SPM and its capability of an unlimited self-rotate in an extended workspace. A comparison of the self-rotation performances between the classical 3-RRR SPM (R for revolute joint) and the New SPM is also presented.

Keywords

spherical parallel manipulatorunlimited self-rotationoptimizationgenetic algorithmdexterity

Information

Type
Research Article
Information
Robotica , Volume 43 , Issue 1 , January 2025 , pp. 300 - 315
Copyright
© The Author(s), 2024. Published by Cambridge University Press

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