ADAPTIVE PRACTICAL TRACKING CONTROL BY OUTPUT FEEDBACK FOR ACLASS OF NONLINEAR SYSTEMS

doi:10.1007/s11424-010-7243-5

Journal of Systems Science and Complexity ›› 2010, Vol. 23 ›› Issue (6): 1210-1220.DOI: 10.1007/s11424-010-7243-5

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ADAPTIVE PRACTICAL TRACKING CONTROL BY OUTPUT FEEDBACK FOR ACLASS OF NONLINEAR SYSTEMS

Fang SHANG, Yungang LIU, Chenghui ZHANG

School of Control Science and Engineering, Shandong University

Received:2007-12-03 Revised:1900-01-01 Online:2010-12-25 Published:2010-12-25

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Fang SHANG;Yungang LIU;Chenghui ZHANG. ADAPTIVE PRACTICAL TRACKING CONTROL BY OUTPUT FEEDBACK FOR ACLASS OF NONLINEAR SYSTEMS[J]. Journal of Systems Science and Complexity, 2010, 23(6): 1210-1220.

This paper investigates the problem of adaptive practical
tracking control by output feedback for a class of nonlinear
systems in which the nonlinearities are restricted to be upper
bounded by a constant plus a polynomial function of the output
multiplied by unmeasured states. To solve the problem, an observer
with a dynamic high-gain is first introduced, and then an adaptive
output feedback tracking controller is successfully designed using
the universal control methodology. It is shown that all the states
of the closed-loop system are bounded, and the tracking error can
be made arbitrarily small by an appropriate choice of the design
parameters after some large enough time. A simulation example is
also provided to illustrate the correctness of the theoretical
results.

Key words: Adaptive practical tracking, dynamic high-gain, nonlinear systems, output feedback.

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