Anti-Disturbance Fault-Tolerant Adaptive Output Feedback Control for Uncertain Nonlinear Systems With Disturbance Observer

Abstract

This work aims at the adaptive fuzzy fault-tolerant control (FTC) issue of nonlinear singular systems subject to external disturbances. First, we decompose the nonlinear singular system into two coupled subsystems: 1) differential subsystem and 2) algebraic subsystem. Then, an error system is denoted through designing state and disturbance observers, and the regularization and impulse-free conditions are derived. Combined with the state and disturbance observers, a novel output feedback-based adaptive fault-tolerant controller with the multi-input fault compensation technique and fuzzy approximation method is proposed, and the boundedness of the nonlinear singular system is guaranteed. Finally, the designed control scheme is utilized to a numerical system and a nonlinear circuit to validate the effectiveness and feasibility.