Simultaneous design of AWC and nonlinear controller for uncertain nonlinear systems under input saturation

2019 ◽  
Vol 29 (10) ◽  
pp. 2877-2897 ◽  
Author(s):  
Muntazir Hussain ◽  
Muhammad Rehan ◽  
Choon Ki Ahn ◽  
Keum‐Shik Hong ◽  
Najam us Saqib
Keyword(s):  
Nonlinear Systems ◽  
Input Saturation ◽  
Uncertain Nonlinear Systems ◽  
Nonlinear Controller ◽  
Simultaneous Design

scholarly journals Robust Control of Uncertain Nonlinear Systems: A Nonlinear DOBC Approach

2016 ◽  
Vol 138 (7) ◽  
Author(s):  
Wen-Hua Chen ◽  
Jun Yang ◽  
Zhenhua Zhao
Keyword(s):  
Robust Control ◽  
Nonlinear Systems ◽  
Disturbance Observer ◽  
External Disturbance ◽  
Uncertain Nonlinear Systems ◽  
Nonlinear Controller ◽  
Nonlinear Disturbance Observer ◽  
Spring System ◽  
Mass Spring ◽  
Distinct Features

This paper advocates disturbance observer-based control (DOBC) for uncertain nonlinear systems. Within this framework, a nonlinear controller is designed based on the nominal model in the absence of disturbance and uncertainty where the main design specifications are to stabilize the system and achieve good tracking performance. Then, a nonlinear disturbance observer is designed to not only estimate external disturbance but also system uncertainty/unmodeled dynamics. With described uncertainty, rigorous stability analysis of the closed-loop system under the composite controller is established in this paper. Finally, the robust control problems of a missile roll stabilization and a mass spring system are addressed to illustrative the distinct features of the nonlinear DOBC approach.

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