Estimation of Vibration Characteristics of a Space Manipulator From Air Bearing Supported Test Data

Haiquan Li; Qingqing Wei; Jianxun Liang; Weiyan Ren; Zixin Tang; Delun Li

doi:10.3389/frobt.2021.641165

Estimation of Vibration Characteristics of a Space Manipulator From Air Bearing Supported Test Data

Front Robot AI. 2021 May 13:8:641165. doi: 10.3389/frobt.2021.641165. eCollection 2021.

Authors

Haiquan Li¹, Qingqing Wei^{2

3}, Jianxun Liang¹, Weiyan Ren¹, Zixin Tang^{2

3}, Delun Li^{2

3}

Affiliations

¹ School of Aerospace Engineering, Tsinghua University, Beijing, China.
² Beijing Key Laboratory of Intelligent Space Robotic System Technology and Applications, Beijing, China.
³ Beijing Institute of Spacecraft System Engineering, Beijing, China.

Abstract

Space manipulators have attracted much attention due to their implications in on-orbit servicing in recent years. Air bearing based support equipment is widely used for ground test to offset the effect of gravity. However, an air bearing support introduces a new problem caused by additional inertial and mass properties. Additional mass and inertial load will influence the dynamics behavior, especially stiffness information and vibration response of the whole ground test system. In this paper, a set of procedures are presented to remove the influence of air bearings and identify the true equivalent joint stiffness and damping from the test data of a motor-braked space manipulator with an air bearing support. First, inertia parameters are identified. Then, the equivalent joint stiffness and damping are determined by using a genetic algorithm (GA) method. Finally, true vibration characteristics of the manipulator are estimated by removing the additional inertia caused by the air bearings. Moreover, simulations and experiments are carried out to validate the presented procedures.

Keywords: air bearing; ground-test; identification; space manipulator; vibration.