Two results for adaptive output feedback stabilization of nonlinear systems (Q1400322)

The authors consider the problem of (adaptive) stabilization by means of output feedback of a class of nonlinear systems. 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 also discussed via theoretical examples. In addition, the authors show 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.