Open AccessActive fault tolerant control scheme for satellite attitude system subject to actuator time‐varying faults
Author(s) -
Gao Zhifeng,
Zhou Zepeng,
Qian Moshu S.,
Lin Jinxing
Publication year - 2018
Publication title -
iet control theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.059
H-Index - 108
eISSN - 1751-8652
pISSN - 1751-8644
DOI - 10.1049/iet-cta.2017.0969
Subject(s) - control theory (sociology) , backstepping , actuator , attitude control , fault tolerance , computer science , lyapunov function , fault (geology) , lyapunov stability , active fault , satellite , control engineering , engineering , adaptive control , control (management) , nonlinear system , artificial intelligence , distributed computing , seismology , aerospace engineering , geology , physics , quantum mechanics
This study investigates the active fault tolerant control (FTC) problem for the attitude system of a rigid satellite, which is affected by parameter uncertainty, unknown exogenous disturbance and actuator time‐varying faults. The upper bounds of the actuator time‐varying fault and the generalised perturbation are unknown. A novel adaptive non‐linear fault estimation observer is designed in order to obtain the estimated value of unknown time‐varying faults. Then, an active fault tolerant attitude control approach is proposed under the framework of both backstepping control and adaptive control theory. Consequently, the Lyapunov theory is used to prove the robust asymptotic stability for the closed‐loop attitude system of a faulty satellite under the proposed FTC scheme. Finally, simulation results on an in‐orbit rigid satellite are provided to show the good fault tolerant performance, which validate the effectiveness and feasibility of the proposed scheme.