Fault-tolerant control for a class of n-order systems based on fast terminal sliding mode and extended state observer

Abstract

This paper focuses on fast terminal sliding mode fault-tolerant control for a class of n-order nonlinear systems. Firstly, when the actuator fault occurs, the extended state observer (ESO) is used to estimate the lumped uncertainty and its derivative of the system, so that the fault boundary is not needed to know. The convergence of ESO is proved theoretically. Secondly, a new type of fast terminal sliding surface is designed to achieve global fast convergence, non-singular control law and chattering reduction, and the Lyapunov stability criterion is used to prove that the system states converge to the origin of the sliding mode surface in finite time, which ensures the stability of the closed-loop system. Finally, the effectiveness and superiority of the proposed algorithm are verified by two simulation experiments of different order systems.

Fault-Tolerant Control for Carrier-Based Aircraft Based on Adaptive Fuzzy Sliding-Mode Method

“…However, the literature contains few relevant studies of landing control for CBA. In recent years, adaptive control theory has been applied widely to active FTC technology, and it has become a common theoretical method in FTC strategy after being combined with fuzzy theory [34], sliding-mode control theory [35,36], backstepping method [37], etc. Regarding establishing a fault-tolerant flight control system, modelling the controlled object and measuring uncertain parameters must be done first, and then the adaptiveness and robustness of the system should be ensured.…”