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backlash clearance

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1 results

Joint dynamic analysis of space manipulator with planetary gear train transmission
Tianfu Yang, Shaoze Yan, Wei Ma, Zengyao Han
Journal:

Robotica / Volume 34 / Issue 5 / May 2016

Published online by Cambridge University Press:

30 July 2014, pp. 1042-1058
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Joints of space manipulators are usually simplified as torsional springs in modeling motion equations, and the nonlinear behaviors of the reducer in the joints are generally neglected. In this study, a dynamic model of a space manipulator that considers the joints that are transmitted through a typical 2K-H planetary gear reducer is developed using the Lagrangian method. The backlash clearances, gear tooth profile error, and time-variant meshing stiffness are integrated into the process. The simulation results show that the backlash clearances lead to the accumulation of positioning errors in the space manipulator when the joints rotate back and forth. The tooth profile error is the main cause of severe acceleration fluctuations and meshing force impacts. These fluctuations influence torque instability, which may accelerate gear system failure.