Adaptive Fixed-time Fault-tolerant Control of Nonstrict-Feedback Nonlinear Systems

In this paper, a fixed-time fault-tolerant tracking control method for nonstrict-feedback nonlinear systems is proposed. Firstly, fuzzy logic systems are employed to approximate unknown nonlinear functions and handle nonstrict-feedback structures. Additionally, the command filter technique is utilized to address the issue of "complexity explosion". Furthermore, a novel adaptive estimation law is developed to effectively compensate for actuator faults. It is proved that the proposed fixed-time control method ensures a known and independent upper bound of dwell time and the boundedness of all signals in the closed- loop system can be ensured. Finally, a simulation example is presented to demonstrate the effectiveness of the proposed control method.