Brief Two results for adaptive output feedback stabilization of nonlinear systems

Authors:
D. Karagiannis;A. Astolfi;R. Ortega
Affiliations:
Department of Electrical and Electronic Engineering, Imperial College, London SW7 2BT, UK;Department of Electrical and Electronic Engineering, Imperial College, London SW7 2BT, UK and Dipartimento di Elettronica e Informazione, Politecnico di Milano, 20133 Milan, Italy;Laboratoire des Signaux et Systèmes, Supélec, Plateau de Moulon, 91192 Gif-sur-Yvette, France
Venue:
Automatica (Journal of IFAC)
Year:
2003

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Abstract

The problem of (adaptive) stabilization by means of output feedback of a class of nonlinear systems is addressed and solved. The proposed method relies on the asymptotic reconstruction of a stabilizing state feedback control law, does not require stable zero dynamics nor the construction of a Lyapunov function for the closed loop system, and treats in a unified way unknown parameters and unmeasured states. The applicability of the proposed method is discussed via theoretical examples. Finally, it is shown that the proposed method yields a solution to the problem of output feedback regulation for a DC-to-DC power converter and the efficacy of the resulting controller is verified via experiments.