Premium
INDIRECT ADAPTIVE CONTROL FOR NONLINEAR SYSTEMS WITH SYSTEM PERTURBATION
Author(s) -
Chang KuoMing
Publication year - 1999
Publication title -
asian journal of control
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.769
H-Index - 53
eISSN - 1934-6093
pISSN - 1561-8625
DOI - 10.1111/j.1934-6093.1999.tb00011.x
Subject(s) - control theory (sociology) , nonlinear system , dead zone , estimator , adaptive control , perturbation (astronomy) , mathematics , control (management) , computer science , physics , statistics , geology , oceanography , quantum mechanics , artificial intelligence
This paper presents an indirect adaptive control scheme for a class of input‐output linearizable nonlinear systems subjected to system perturbations. System parameters are unknown and estimated recursively by a parameter estimator to obtain approximate system output and output derivatives, and then to derive an adaptive control law. In the parameter estimator, a dead‐zone approach is used to avoid the parameter drift problem. A positive switching gain is also set to decrease the dead‐zone value to obtain better output tracking performance. Under some assumptions, the indirect adaptive control scheme is proved to be stable.