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		Buzhou WU,Zhengtao DING.[en_title][J].Control Theory and Technology,2010,8(3):382~389.[Copy]

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BuzhouWU,ZhengtaoDING
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DOI：10.1007/s11768-010-0048-1

Received:February 26, 2010Revised:February 26, 2010

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Practical disturbance rejection of a class of nonlinear systems via sampled output

Buzhou WU,Zhengtao DING

(Control Systems Centre, School of E&EE, The University of Manchester, PO Box 88, Sackville Street, Manchester, M60, 1QD,UK)

Abstract:

This paper presents a sampled-data control scheme for the disturbance rejection of nonlinear systems in the output feedback form. The continuous-time controller is designed first using a filtered transformation and the internal model technique. Using the emulation approach, the proposed sampled-data control uses the sampled output and a discretetime implementation of the filter, and the internal model is involved. The proposed control is shown to render the overall system stable in a spirit of fast sampling. In particular, the disturbance is practically rejected in the sense that the ultimate bound of the output is allowed to be arbitrarily small by choosing appropriate gain parameters.

Key words: Sampled-data control Disturbance rejection Nonlinear systems