Title

Robust control of nonlinear systems in the presence of unknown exogenous dynamics

Authors

Authors

Z. H. Qu;Y. F. Jin

Comments

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Abbreviated Journal Title

IEEE Trans. Autom. Control

Keywords

bounding function; estimation; Lyapunov direct method; nonlinear; uncertainty; observer; robust control; OUTPUT-FEEDBACK CONTROL; STABILIZATION; Automation & Control Systems; Engineering, Electrical & Electronic

Abstract

A robust control is designed for a class of uncertain systems, and it is distinct and novel that the proposed control does not require any information of a bounding function on nonlinear uncertainties in the system. Instead, the uncertainties to be compensated for are generated by an exogenous system whose dynamics are either completely unknown or partially unknown. The only requirements on the exogenous system are that its unknown dynamics are bounded by a known function and that its output is bounded. The proposed robust control is based on a nonlinear observer that estimates the uncertainties. It is shown that, under different sets of conditions, local, semiglobal, or global stability of uniform ultimate boundedness or asymptotic stability can be achieved.

Journal Title

Ieee Transactions on Automatic Control

Volume

48

Issue/Number

2

Publication Date

1-1-2003

Document Type

Article

Language

English

First Page

336

Last Page

343

WOS Identifier

WOS:000181099700024

ISSN

0018-9286

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