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Dimensional multi-objective optimization design for 2RPU-RPS parallel mechanism

Published online by Cambridge University Press:  07 February 2025

Siyang Peng Open the ORCID record for Siyang Peng [Opens in a new window] ,
Li Du ,
Linxian Che  and
Zujin Jin Open the ORCID record for Zujin Jin [Opens in a new window]
Siyang Peng
Affiliation:
School of Mechanical Engineering, Chongqing Technology and Business University, Chongqing, China
Li Du*
Affiliation:
School of Mechanical Engineering, Chongqing Technology and Business University, Chongqing, China
Linxian Che*
Affiliation:
School of Intelligence Manufacturing and Traffic, Chongqing Vocational Institute of Engineering, Chongqing, China
Zujin Jin
Affiliation:
School of Mechanical and Electronic Engineering, Suzhou University, Suzhou, China
*
Corresponding authors: Li Du; Email: dulicq@126.com and Linxian Che; Email: lx.che@163.com
Corresponding authors: Li Du; Email: dulicq@126.com and Linxian Che; Email: lx.che@163.com
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Abstract

A modeling method of multi-objective optimization design for parallel mechanisms (PMs) is proposed, whose implementation is illustrated with 2RPU-RPS mechanism as an example. The orientation of biased output axis on moving platform is depicted by spherical attitude angles, and its kinematic model is deduced through vector method. With screw theory as mathematic tool, a comprehensive evaluation method of kinematic performance for PM is established. On this basis, the expensive constrained multi-objective optimization model of dimensional parameters for the discussed mechanism is constructed. The NSDE-II algorithm, formed by replacing the genetic algorithm operators in non-dominated sorting genetic algorithm II (NSGA-II) with DE operators, is utilized to solve this multi-objective optimization problem, thus obtaining multiple Pareto optimal solutions with engineering application significance, which proves the feasibility and effectiveness of the proposed modeling method and algorithm. Moreover, the normalization coverage space and the minimum adjacent vector angle are proposed to evaluate the computational performance of NSDE-II. Finally, the potential engineering application value for the optimized 2RPU-RPS PM is presented.

Keywords

parallel mechanismmotion/force transmission performanceregular transmission orientation workspacemulti-objective optimizationdifferential evolution algorithm

Information

Type
Research Article
Information
Robotica , Volume 43 , Issue 3 , March 2025 , pp. 1087 - 1109
Copyright
© The Author(s), 2025. Published by Cambridge University Press

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