DocumentCode :
3551108
Title :
Adaptive output-feedback for nonlinear systems with no a priori bounds on parameters
Author :
Krishnamurthy, P. ; Khorrami, F.
Author_Institution :
Dept. of Electr. & Comput. Eng., Polytech. Univ., Brooklyn, NY, USA
fYear :
2005
fDate :
8-10 June 2005
Firstpage :
3713
Abstract :
In a result by P. Krishnamurthy and F. Khorrami (2004), we proposed a dynamic high-gain observer/controller architecture for nonlinear systems of the generalized output-feedback canonical form. The design of P. Krishnamurthy and F. Khorrami (2004) utilized the dual architecture of a high-gain observer and controller and incorporated a single dynamic scaling. The designed output-feedback controller was shown to be robust to functional and parametric uncertainties coupled with all states. However, a magnitude bound on the unknown parameters was required. In this paper, we propose a time-varying output-feedback controller that can handle time-varying nonlinear parametric uncertainty coupled with all states without requiring any a priori magnitude bounds on the unknown parameters. This is achieved using a novel time-varying dynamics of the high-gain scaling parameter. The proposed observer/controller structure provides a globally asymptotically stabilizing output-feedback solution for the benchmark open problem proposed in our earlier work with no magnitude bounds or sign information on the unknown parameter being necessary.
Keywords :
adaptive control; asymptotic stability; control system synthesis; feedback; nonlinear control systems; observers; time-varying systems; adaptive output-feedback; asymptotic stability; high-gain observer; nonlinear parametric uncertainty; nonlinear system; time varying output-feedback controller; Control systems; Couplings; Lyapunov method; Nonlinear control systems; Nonlinear systems; Observers; Programmable control; Riccati equations; Robust control; Uncertainty;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
American Control Conference, 2005. Proceedings of the 2005
ISSN :
0743-1619
Print_ISBN :
0-7803-9098-9
Electronic_ISBN :
0743-1619
Type :
conf
DOI :
10.1109/ACC.2005.1470552
Filename :
1470552
Link To Document :
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