DocumentCode :
697420
Title :
Adaptive output feedback control of nonlinear time-varying systems
Author :
Marino, R. ; Tornei, P.
Author_Institution :
Dipt. di Ing. Elettron., Univ. di Roma `Tor Vergata´, Rome, Italy
fYear :
2001
fDate :
4-7 Sept. 2001
Firstpage :
2452
Lastpage :
2457
Abstract :
Single-input single-output nonlinear systems with unknown smooth, uniformly bounded, arbitrarily time-varying parameters and output dependent nonlinearities are considered: they include as a special case linear time-varying systems. The output, which is the only measured variable, is required to track a given smooth bounded reference trajectory. The system is supposed to be minimum-phase and to have known and constant relative degree, known sign of the high frequency gain and known upper bound on the system order. An output feedback control algorithm is designed which guarantees: i) boundedness of all closed loop signals; ii) arbitrarily improved transient performance of the tracking error, with respect to parameter estimation errors and parameter time derivatives; iii) asymptotically vanishing tracking errors when the parameters belong to a compact set pre-determined by the controller and their time derivatives are bounded L1 signals.
Keywords :
adaptive control; closed loop systems; control nonlinearities; control system synthesis; feedback; nonlinear control systems; parameter estimation; time-varying systems; adaptive output feedback control; asymptotically vanishing tracking errors; closed loop signals; linear time-varying systems; minimum-phase system; nonlinear time-varying systems; output dependent nonlinearities; output feedback control algorithm; parameter estimation errors; parameter time derivatives; single-input single-output nonlinear systems; smooth bounded reference trajectory; tracking error transient performance; Decision support systems; Erbium; Europe; Hafnium; Niobium; Zirconium; Nonlinear time-varying systems; adaptive control; output feedback; time-varying parameters; transient performance;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Control Conference (ECC), 2001 European
Conference_Location :
Porto
Print_ISBN :
978-3-9524173-6-2
Type :
conf
Filename :
7076295
Link To Document :
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