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Stiffness Analysis of Parallel Cable-Driven Upper Limb Rehabilitation Robot
Yupeng Zou1,2, Xiangshu Wu1, Baolong Zhang1
1College of Mechanical and Electronic Engineering, China University of Petroleum (East China), Qingdao 266580, China.
Abstract:
This paper studies the stiffness of the parallel cable-driven upper limb rehabilitation robot (PCUR). Firstly, it was derived that the static stiffness expression of the PCUR was composed of platform pose stiffness T and cable pose stiffness S. It indicated that the static stiffness of the PCUR was related to the cable tension, the arrangement of the cable, and the cable stiffness. Secondly, a simulation model in MATLAB/Simscape Multibody was built. Cable tension was applied to make the moving platform in a static equilibrium state. The stiffness of the PCUR and the external force on the moving platform were changed, and the motion characteristics of the moving platform were obtained. Finally, the position changes of the moving platform under different external forces were analyzed, and the motion laws of the moving platform under different stiffnesses were summarized.
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