NDLI: Robust output feedback control for unknown non-linear systems with external disturbance

Content Provider	IET Digital Library
Author	Kim, Wonhee Chung, Chung Choo
Abstract	The authors propose a robust output feedback control for unknown non-linear systems with external disturbance. The main contribution of this study is that the proposed method guarantees the global uniform ultimate boundedness of the output tracking error using only output feedback for unknown non-linear systems with external disturbance. The key idea of the proposed method is that the plant non-linearities and external disturbance, and their derivatives are lumped into augmented state variables. The robust high order augmented observer (RHOAOB) is developed to estimate the lumped augmented state variables and full state. The benefit to using the RHOAOB is that the estimation error can be reduced without increasing the bandwidth of the RHOAOB. The backstepping controller is designed to guarantee the global uniform ultimate boundedness of the output tracking error occurred by the disturbance estimation error. To the best of the authors' knowledge, it might be the first attempt of the analysis of the estimation and output tracking performance of the RHOAOB-based controller with the measurement noise in both time and frequency domains. The analysis shows that very small estimation error is not necessarily required to obtain the precise output tracking using an input-to-state stability property. This merit results in avoiding the amplification of the measurement noise.
Starting Page	173
Ending Page	182
Page Count	10
ISSN	17518644
Volume Number	10
e-ISSN	17518652
Issue Number	Issue 2, Jan (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-cta/10/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-cta.2014.1299
Journal	IET Control Theory & Applications
Publisher Date	2016-01-19
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Backstepping Controller Design Control Nonlinearities Control System Analysis Control System Synthesis Disturbance Estimation Error Error Statistics External Disturbance Feedback Frequency Domain Analysis Global Uniform Ultimate Boundedness Input-output Stability Input-to-state Stability Lumped Augmented State Variable Estimation Measurement Error Measurement Noise Modelling And Identification Nonlinear Control System Observers Output Tracking Error Plant Nonlinearities RHOAOB RHOAOB-based Controller Robust Control Robust High Order Augmented Observer Robust Output Feedback Control Simulation Stability in Control Theory Statistics Synthesis Method Time Domain Analysis Time-frequency Analysis Unknown Nonlinear System
Content Type	Text
Resource Type	Article
Subject	Control and Optimization Control and Systems Engineering Human-Computer Interaction Electrical and Electronic Engineering Computer Science Applications

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