PID Dynamic Sliding Mode Fault-Tolerant Control with Time-Delay Estimation for Liquid-Filled Spacecraft with Large-Amplitude Sloshing

This paper investigates the attitude tracking control of a liquid-filled spacecraft, addressing the challenges such as large-amplitude liquid sloshing, external disturbances, and actuator faults. To overcome these issues, a novel proportional-integral-derivative (PID) dynamic sliding mode fault-tolerant control with time-delay estimation (TDE-PID-DSM-FTC) is proposed. In this regard, the attitude dynamics model of liquid-filled spacecraft with large-amplitude liquid sloshing is constructed. Then, a PID dynamic sliding mode fault-tolerant control is developed for high-precision attitude tracking. Furthermore, a time-delay estimation method is developed to estimate the unknown dynamics model. The simulation results demonstrate that a TDE-PID-DSM-FTC can not only achieve fixed-time convergence of the system state, but also eliminate the chattering phenomenon caused by the switching control action. Finally, the simulation is performed to verify the feasibility and advantages of the proposed control scheme.