Adaptive output feedback fault‐tolerant control for MIMO non‐affine non‐linear systems based on disturbance observer. Issue 18 (1st December 2016)

• Record Type: Journal Article
• Authors: Ma, Zhiyao; Tong, Shaocheng; Li, Yongming
• Is Part Of: IET control theory & applications. Volume 10:Issue 18(2016)
• Page Start: 2422
• Page End: 2436
• Publication Date: 2016-12-01
• Subjects: adaptive control -- MIMO systems -- nonlinear control systems -- feedback -- fault tolerant control -- observers -- nonlinear functions -- fuzzy logic -- fuzzy systems -- robust control -- compensation -- Lyapunov methods -- control nonlinearities -- control system synthesis -- closed loop systems -- fuzzy control; adaptive output feedback fault‐tolerant control -- MIMO nonaffine nonlinear systems -- nonaffine output‐constrained multiinput multiple‐output nonlinear systems -- actuator faults -- unknown nonlinear functions -- unknown external disturbance -- fuzzy logic systems -- robust compensation function -- state observer -- nonlinear disturbance observer -- unknown compounded disturbance -- barrier Lyapunov function -- adaptive backstepping output feedback control design -- adaptive fuzzy fault‐tolerant controller design -- closed‐loop system -- semiglobally uniformly bounded -- nonaffine nonlinear faults; Control theory -- Periodicals; Automatic control -- Periodicals; 629.8312
• DOI: 10.1049/iet-cta.2016.0612
• Languages: English
• ISSNs: 1751-8644

Abstract

Abstract : In this study, the fault‐tolerant control problem is investigated for a class of non‐affine output‐constrained multi‐input multiple‐output non‐linear systems with actuator faults. The controlled systems contain unknown non‐linear functions, unknown external disturbance and immeasurable states. The fuzzy logic systems and a robust compensation function are employed to deal with the unknown non‐linear functions and non‐affine non‐linear actuator fault problems. Then, the state observer and the non‐linear disturbance observer are developed for estimating the immeasurable states and unknown compounded disturbance, respectively. By using the barrier Lyapunov function method and in the unified framework of adaptive backstepping output feedback control design, a novel adaptive fuzzy fault‐tolerant controller design scheme is developed. It is shown that all the variables of the closed‐loop system are semi‐globally uniformly bounded. Moreover, the system outputs cannot violate their predefined bounds in the presence of the non‐affine non‐linear faults. A simulation is given to validate the effectiveness of the proposed approach.