Authors: Wu Liu; Yanli Du; Erwin Mooij; Haibing Lin
Addresses: College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, 211106, China ' College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, 211106, China ' Faculty of Aerospace Engineering, Delft University of Technology Delft, 2629 HS, Netherlands ' Data Transmission Department, Shanghai Aerospace Electronic Technology Institute, Shanghai, 201109, China
Abstract: Aiming at unknown disturbances/uncertainties, partial effectiveness loss fault (PELF) and stuck failure (SF) of the actuator, a composite robust fault-tolerant control strategy based on incremental backstepping (IBS) is proposed for a reusable launch vehicle (RLV) during re-entry. By converting PELF to disturbances/uncertainties, this paper presents an incremental form of disturbance observer based on an improved inverse hyperbolic sine tracking differentiator (IHSTD) to compensate these interference terms originally ignored in the IBS design process. Furthermore, a failure symbol matrix is set to control the on-off states of the reaction control system of the RLV to make up for the missing torque of the actuator SF, which can strengthen the fault-tolerance capability of the control system. The simulation results show that the tracking effect of the proposed method on the attitude-angle commands is better than traditional backstepping with disturbance observer, and the presented control allocation strategy is capable of timely resolving the actuator SF problem to ensure stability of flight.
Keywords: RLV; reusable launch vehicle; fault-tolerant control; IBS; incremental backstepping; tracking differentiator disturbance observer; reaction control system; partial effectiveness loss fault; stuck failure; robust control; re-entry control system.
International Journal of Modelling, Identification and Control, 2020 Vol.35 No.3, pp.226 - 240
Received: 08 Jan 2020
Accepted: 10 Jun 2020
Published online: 09 Apr 2021 *