| Citation: | DONG Xinlei, QI Ruiyun, LU Shan, et al. Event-triggered attitude control of liquid-filled spacecraft[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(2): 382-390. doi: 10.13700/j.bh.1001-5965.2020.0282(in Chinese)
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Aimed at the attitude system of liquid-filled spacecraft with large-amplitude liquid sloshing and limited communication resources, a control strategy combining adaptive sliding mode control and event-triggering mechanism is proposed. First, sliding mode variable structure control is used to weaken the nonlinear effect of large-amplitude liquid sloshing for a liquid-solid coupled spacecraft attitude system, and an adaptive updating law is designed to estimate the uncertain parameters online to improve the robustness of the system. Then, considering the limitation of onboard computer resources, an event-triggering mechanism with relative threshold is designed to determine the update of control input signal, so as to reduce the occupation of communication network caused by signal update between controller and actuator. Finally, the simulation results show that, under large-amplitude liquid sloshing, the control strategy can not only make the spacecraft attitude system converge to an arbitrary small boundary, but also reduce the control signal transmission by 96% and reduce the communication load of spacecraft.
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