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Joint dynamic analysis of space manipulator with planetary gear train transmission

Published online by Cambridge University Press:  30 July 2014

Tianfu Yang ,
Shaoze Yan ,
Wei Ma  and
Zengyao Han
Tianfu Yang
Affiliation:
State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China
Shaoze Yan*
Affiliation:
State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China
Wei Ma
Affiliation:
China Academy of Space Technology, Beijing, 100094, China
Zengyao Han
Affiliation:
China Academy of Space Technology, Beijing, 100094, China
*
*Corresponding author. E-mail: yansz@mail.tsinghua.edu.cn
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Summary

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.

Keywords

Robot dynamicsSpace roboticsManipulator jointPlanetary gear trainBacklash clearanceTooth profile error

Information

Type
Articles
Information
Robotica , Volume 34 , Issue 5: RAAD , May 2016 , pp. 1042 - 1058
Copyright
Copyright © Cambridge University Press 2014 

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