Active fault-tolerant control scheme for satellite with four reaction wheels: Multi actuator faults case

Abstract

This study outlines an approach to design an active fault tolerance control (FTC) system for satellite attitude systems that handle multiple actuator faults. First, a model is provided for the nonlinear attitude system of rigid satellites. Next, an actuator fault detection observer and a fault estimation observer are presented, which detects the time unknown actuator faults that occur and obtains estimated values. Using adaptive sliding mode control techniques, a fault tolerance attitude controller is designed that stabilizes the closed-loop attitude system of rigid satellites in the case of multiple actuator faults. Finally, an experiment is provided demonstrating the superior performance of the active FTC system proposed in this study.