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Adaptive regulation of nonlinear systems with unmodeled dynamics

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4 Author(s)
Taylor, D.G. ; Sch. of Electr. Eng., Georgia Inst. of Technol., Atlanta, GA, USA ; Kokotovic, P.V. ; Marino, R. ; Kannellakopoulos, I.

A feedback linearization design is presented which includes unknown parameters and unmodeled dynamics. An adaptive update law which counteracts the effects of unknown parameters is shown to be robust to the unmodeled dynamics. The proposed design methodology is based on a conceptually simple stability analysis. Conditions are given for global stability of an adaptive control law designed for the reduced-order model of a class of nonlinear plants. In the presence of unmodeled dynamics, the regulation property is preserved in a stability region. The size of the region is estimated using bounds that not only prove robustness, but also allow a comparison between adaptive and nonadaptive nonlinear controls

Published in:

Automatic Control, IEEE Transactions on  (Volume:34 ,  Issue: 4 )