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Kinematic accuracy research of 2(3HUS+S) parallel manipulator for simulation of hip joint motion

Published online by Cambridge University Press:  06 June 2018

Huizhen Zhang
Affiliation:
School of Mechatronic Engineering, China University of Mining and Technology, 221116 Xuzhou, P. R. China
Gang Cheng*
Affiliation:
School of Mechatronic Engineering, China University of Mining and Technology, 221116 Xuzhou, P. R. China
Xianlei Shan
Affiliation:
School of Mechatronic Engineering, China University of Mining and Technology, 221116 Xuzhou, P. R. China
Feng Guo
Affiliation:
School of Mechatronic Engineering, China University of Mining and Technology, 221116 Xuzhou, P. R. China
*
*Corresponding author. E-mail: chgcumt@gmail.com, chg@cumt.edu.cn

Summary

In this paper, the kinematic accuracy problem caused by geometric errors of a 2(3HUS+S) parallel manipulator is described. The kinematic equation of the manipulator is obtained by establishing a D–H (Denavit–Hartenberg) coordinate system. A D–H transformation matrix is used as the error-modeling tool, and the kinematic error model of the manipulator integrating manufacturing and assembly errors is established based on the perturbation theory. The iterative Levenberg–Marquardt algorithm is used to identify the geometric errors in the error model. According to the experimentally measured attitudes, the kinematic calibration process is simulated using MATLAB software. The simulation and experiment results show that the attitude errors of the moving platforms after calibration are reduced compared with before the calibration, and the kinematic accuracy of the manipulator is significantly improved. The correctness and effectiveness of the error model and the kinematic calibration method of the 2(3HUS+S) parallel manipulator for simulation of hip joint motion are verified.

Type
Articles
Copyright
Copyright © Cambridge University Press 2018 

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