XU Yun dou WANG Chao ZHAO Chun lin YANG Fan YAO Jian tao ZHAO Yong sheng ,. <div>Parameter calibration of five degree of freedom&nbsp;</div>,<div>hybrid robot 2RPU/UPR+RP</div>[J]. Editorial Office of Optics and Precision Engineering, 2020,28(1): 119-129
XU Yun dou WANG Chao ZHAO Chun lin YANG Fan YAO Jian tao ZHAO Yong sheng ,. <div>Parameter calibration of five degree of freedom&nbsp;</div>,<div>hybrid robot 2RPU/UPR+RP</div>[J]. Editorial Office of Optics and Precision Engineering, 2020,28(1): 119-129DOI:
In order to improve the accuracy of the 2RPU/UPR+RP over-constrained hybrid robot in practical application and meet the requirements of production practice
the error compensation research of the robot is carried out. Firstly
the motion principle of the over-constrained hybrid robot is introduced. Then the geometric error sources that affect the end precision of the hybrid robot are analyzed
and the zero calibration and full calibration method for improving the accuracy of the hybrid robot are introduced. The hybrid robot is divided into two parts: the parallel mechanism and the swing head with single-degree-of-freedom. Theoretical research on zero calibration and full calibration are conducted on these two parts respectively. Then the calibration experiment system is built up based on the laser tracker
and true values of error parameters are obtained by using genetic algorithm after calibration
which are compensated to the kinematics algorithm. As a result
the positioning accuracy of the robot is greatly improved
which indicates that the proposed full calibration and zero calibration method based on genetic algorithm can effectively improve the positioning accuracy of the hybrid robot.