Paper Info
Title
Fuzzy Robust Constrained Control for Nonlinear Systems With Input Saturation and External Disturbances
Abstract
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.
Year
DOI
Venue
2021
10.1109/TFUZZ.2019.2952794
IEEE Transactions on Fuzzy Systems
Keywords
DocType
Volume
Adaptive tracking control,backstepping control,fuzzy logic systems (FLSs),high-order disturbance observer (HODO),input saturation
Journal
29
Issue
ISSN
Citations 
2
1063-6706
5
PageRank 
References 
Authors
0.41
16
5
Name
Order
Citations
PageRank
Xiaohui Yan150.75
Mou Chen2125159.31
Gang Feng37753468.09
Qingxian Wu4161.93
Shuyi Shao5564.12