Adaptive fuzzy fault‐tolerant control for non‐linear systems under actuator and sensor faults: the practical fixed‐time stability. Issue 19 (17th February 2021)

• Record Type: Journal Article
• Authors: Yang, Yekai; Niu, Yugang; Zhang, Zhina
• Is Part Of: IET control theory & applications. Volume 14:Issue 19(2020)
• Page Start: 3291
• Page End: 3300
• Publication Date: 2021-02-17
• Subjects: linear systems -- fault diagnosis -- actuators -- fault tolerance -- closed loop systems -- feedback -- control nonlinearities -- control system synthesis -- fuzzy control -- adaptive control -- uncertain systems -- stability -- nonlinear control systems; multiplicative faults -- effectiveness faults -- multiple sensor faults -- faulted states -- fuzzy approximation -- nonlinear functions -- adaptive fuzzy fault‐tolerant control strategy -- fixed‐time stability -- closed‐loop system -- initial states -- control performance -- fault‐tolerant control scheme -- nonlinear systems -- actuator -- adaptive fault‐tolerate control -- strict‐feedback nonlinear system -- additive faults; Control theory -- Periodicals; Automatic control -- Periodicals; 629.8312
• DOI: 10.1049/iet-cta.2020.0689
• Languages: English
• ISSNs: 1751-8644

Abstract

Abstract : This study investigates the adaptive fault‐tolerate control for strict‐feedback non‐linear system, in which actuator and sensor faults may happen simultaneously. Moreover, the additive and multiplicative faults are considered, which cover the bias, drift, loss of accuracy, and loss of effectiveness faults. Under the multiple sensor faults, a modified backstepping technique involving in the faulted states is proposed by utilising the fuzzy approximation to the unknown non‐linear functions. Later, the adaptive fuzzy fault‐tolerant control strategy is designed to ensure the practical fixed‐time stability of the closed‐loop system. Meanwhile, the convergence time is independent of the initial states of the system, and the control performance can be ensured for arbitrary bounded initial states in this study. Finally, the Buck converter circuit is employed to demonstrate the effectiveness of the proposed fault‐tolerant control scheme.