DocumentCode :
2519031
Title :
Adaptive regulation of a class of uncertain nonlinear systems by output feedback
Author :
Dong, Liang ; Ma, Hongjun ; Li, Lin
Author_Institution :
Coll. of Inf. Sci. & Eng., Northeastern Univ., Shenyang, China
fYear :
2011
fDate :
23-25 May 2011
Firstpage :
2447
Lastpage :
2452
Abstract :
This paper studies the problem of global stabilization by output feedback for a family of uncertain nonlinear systems without zero dynamics. The class of uncertain systems under consideration is assumed to be dominated by a bounding system, which is of polynomial growth in the unmeasurable states and can be a polynomial function of the system output, with unknown growth rate. To achieve global state regulation in the presence of parametric uncertainty, we propose a non-identifier based output feedback control scheme by employing the idea of universal control integrated with the design of a linear high-gain observer, whose gains are composed of two components, both of them are not constant and need to be dynamically updated. The novelty of this paper is that a universal-type adaptive output feedback controller is numerically constructed by using a sum of squares (SOS) optimization algorithm, which can globally regulate all the states of the uncertain systems while maintaining global boundedness of the closed-loop system. An example is presented to show the effectiveness of this methodology.
Keywords :
adaptive control; feedback; nonlinear control systems; observers; optimisation; polynomials; uncertain systems; closed loop system; global state regulation; linear high gain observer; parametric uncertainty; polynomial function; sum of squares optimization; uncertain nonlinear system; universal type adaptive output feedback controller; unmeasurable state; zero dynamics; Adaptive systems; Joints; Nonlinear dynamical systems; Observers; Output feedback; Polynomials; Nonlinear systems; output feedback; sum of squares; universal adaptive control;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Control and Decision Conference (CCDC), 2011 Chinese
Conference_Location :
Mianyang
Print_ISBN :
978-1-4244-8737-0
Type :
conf
DOI :
10.1109/CCDC.2011.5968619
Filename :
5968619
Link To Document :
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