TY - JOUR ID - 153372 TI - Fault Tolerant Attitude Control for a Satellite with Four Reaction Wheel JO - Space Science, Technology and Applications JA - JSSTA LA - en SN - AU - M. Sadigh, Sevil AU - Behesgti, Hossein AD - Space Thrusters Research Institute Y1 - 2022 PY - 2022 VL - 2 IS - 1 SP - 118 EP - 131 KW - Satellite attitude control# Fault tolerant control# Actuator faults# Reaction wheel DO - 10.22034/jssta.2022.328077.1072 N2 - In this paper, a passive fault tolerant control method is proposed for the satellite attitude tracking in the presence of external disturbances, the inertia matrix uncertainties, and reaction wheel faults. To achieve this goal, a modified fast terminal sliding model approach is used due to its robustness against the un-modeled uncertainties and being suitable for the nonlinear system model. The sliding surface variable is chosen to avoid singularity, converge to zero in a finite time, and also reduce the Chatting phenomenon. The stability and finite time convergence of the attitude variables are also demonstrated by the extended Lyapunov method. In order to increase the accuracy of the designed controller, the dynamic model of the mentioned actuators is considered. Finally, in order to evaluate the performance of the proposed method, the simulation is performed on a satellite with four reaction wheels under the mentioned conditions. The results show that the proposed method can maintain the stability of the system despite the occurrence of actuator faults, and it makes the state variables converge to the desired trajectories in a finite time and also produce chattering-free control signals. UR - https://journal.isrc.ac.ir/article_153372.html L1 - https://journal.isrc.ac.ir/article_153372_d63cd027966f60ee86301fd556292550.pdf ER -