NONLINEAR DISTURBANCE ATTENUATION WITHGLOBAL STABILITY VIA OUTPUT FEEDBACK

摘要

This paper deals with the problem of disturbance attenuation with stability for a class ofminimum-phase nonlinear uncertain systems by output feedback. In contrast to the state-feedbackcase, a nonlinear, not necessarily linear L_2, gain is employed to characterize the disturbance rejectionlevel. A constructive output feedback design is described to achieve global asymptotic stability whilethe effect of the disturbance on the output is diminished to an arbitrary degree of accuracy. Sufficientconditions are additionally provided to yield a nonlinear output feedback solving the standard L_2-gaindisturbance attenuation problem with internal stability.