Fuzzy Robust Constrained Control for Nonlinear Systems With Input Saturation and External Disturbances

This article proposes a high-order disturbance observer (HODO) and dynamic surface control (DSC) technique-based adaptive fuzzy control scheme for nonlinear systems subjected to input saturation and external time-varying disturbances. First, based on a Sigmoid function, the saturation input is tackl...

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Bibliographic Details
Published inIEEE transactions on fuzzy systems Vol. 29; no. 2; pp. 345 - 356
Main Authors Yan, Xiaohui, Chen, Mou, Feng, Gang, Wu, Qingxian, Shao, Shuyi
Format Journal Article
LanguageEnglish
Published New York IEEE 01.02.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Adaptive control
Adaptive systems
Adaptive tracking control
Backstepping
backstepping control
Chemical reactors
Design parameters
Disturbance observers
Fuzzy control
Fuzzy logic
fuzzy logic systems (FLSs)
Fuzzy systems
high-order disturbance observer (HODO)
input saturation
MIMO communication
Nonlinear control
Nonlinear systems
Nonlinearity
Robust control
Saturation
Time-varying systems
Tracking control
Tracking errors
Uncertainty
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Summary:This article proposes a high-order disturbance observer (HODO) and dynamic surface control (DSC) technique-based adaptive fuzzy control scheme for nonlinear systems subjected to input saturation and external time-varying disturbances. First, based on a Sigmoid function, the saturation input is tackled by utilizing a well-defined nonlinear smooth function. Furthermore, HODO and fuzzy logic systems are used to estimate the external disturbances and to handle the lumped unknown functions, respectively. Then, by using the backstepping method and DSC technique, a HODO-based adaptive fuzzy tracking control scheme is proposed for nonlinear systems with saturation nonlinearity, uncertainties, and external disturbances. The Lyapunov analysis method is used to prove that all signals in the entire system are semiglobally uniformly ultimately bounded (SGUUB). In addition, the tracking error converges to a compact set with a tunable error bound determined by some design parameters. Finally, a numerical simulation of two-stage chemical reactor shows the effectiveness of the developed tracking control strategy.
ISSN:1063-6706
1941-0034
DOI:10.1109/TFUZZ.2019.2952794