In the past two decades,a great deal of interest has been devoted to the design of stabilizing controllers for systems with incomplete or uncertain information.These uncertainties often arise as a result of approximation,imprecision,or imperfect knowledge introduced during the modelling procedure.Moreover,realistic processes are frequently subject to extraneous disturbanceswith known structural properties and with known bounds.Several hundred papers dealing with this subject have appeared in the literature.(We refer to Corless [7],Leitman [24],Dorato and Muscato [11] for overviews and the numerous references therein.) One possible approach is based on a constructive utilization of Lyapunov stability theory.
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