Dynamic Modeling, Workspace Analysis and Multi-Objective Structural Optimization of the Large-Span High-Speed Cable-Driven Parallel Camera Robot

Yu Su; Yuanying Qiu; Peng Liu; Junwei Tian; Qin Wang; Xingang Wang

doi:10.3390/machines10070565

Machines (Jul 2022)

Dynamic Modeling, Workspace Analysis and Multi-Objective Structural Optimization of the Large-Span High-Speed Cable-Driven Parallel Camera Robot

Yu Su,
Yuanying Qiu,
Peng Liu,
Junwei Tian,
Qin Wang,
Xingang Wang

Affiliations

Yu Su: Department of Intelligent Manufacturing Engineering, School of Mechatronic Engineering, Xi’an Technological University, Xi’an 710021, China
Yuanying Qiu: Key Laboratory of Electronic, Equipment Structure Design, Xidian University, Xi’an 710071, China
Peng Liu: School of Mechanical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Junwei Tian: Department of Intelligent Manufacturing Engineering, School of Mechatronic Engineering, Xi’an Technological University, Xi’an 710021, China
Qin Wang: Department of Intelligent Manufacturing Engineering, School of Mechatronic Engineering, Xi’an Technological University, Xi’an 710021, China
Xingang Wang: Department of Intelligent Manufacturing Engineering, School of Mechatronic Engineering, Xi’an Technological University, Xi’an 710021, China

DOI: https://doi.org/10.3390/machines10070565
Journal volume & issue: Vol. 10, no. 7
p. 565

Abstract

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Since most of the cable-driven parallel manipulators (CDPMs) are small in dimension or low in speed, the self-weight or inertia of the cable is neglected when dealing with the problems of kinematics, dynamics and workspace. The cable is treated as a massless straight line, and the inertia of the cable is not discussed. However, the camera robot is a large-span high-speed CDPM. Thus, the self-weight and inertia of the cable cannot be negligible. The curved cable due to the self-weight is modeled as a catenary to accurately account for its sagging effect. Moreover, the dynamic model of the camera robot is derived by decomposing the motion of the cable into an in-plane motion and an out-plane motion, based on which an iterative-based tension distribution algorithm and a workspace generation algorithm are presented. An optimization model is presented to simultaneously improve the workspace volume, anti-wind disturbance ability and impulse of tensions on the camera and pan–tilt device system (CPTDS) by selecting the proper optimal variables under the linear and nonlinear constraints. An improved genetic algorithm (GA) is proposed, and the simulation results demonstrate that the improved GA offers a stronger ability in global optimization compared to the standard genetic algorithm (SGA). The ideal-point method is employed to avoid the subjective influence of the designer when performing the multi-objective optimization, and a remarkable improvement of the performance is obtained through the optimization. Furthermore, the distribution characteristics of the optimization objects are studied, and some valuable conclusions are summarized, which will provide some valuable references in designing large-span high-speed CDPMs.

Published in Machines

ISSN: 2075-1702 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Mechanical engineering and machinery
Website: http://www.mdpi.com/journal/machines

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