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Mathematical Problems in Engineering
Volume 2014, Article ID 621783, 8 pages
Research Article

Disturbance Attenuation via Output Feedback for Uncertain Nonlinear Systems with Output and Input Depending Growth Rate

1School of Control Science and Engineering, Shandong University, Jinan 250061, China
2School of Electrical Engineering and Automation, Qilu University of Technology, Jinan 250353, China

Received 22 June 2014; Revised 19 September 2014; Accepted 3 October 2014; Published 6 November 2014

Academic Editor: Haranath Kar

Copyright © 2014 Weiyong Yu and Fangfang Zhang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The problem of output feedback disturbance attenuation is investigated for a class of uncertain nonlinear systems. The uncertainties of the considered systems are bounded by unmeasured states with growth rate function of output and input multiplying an unknown constant. Based on a dynamic gain observer, an adaptive output feedback controller is proposed such that the states of the closed-loop system are globally bounded, and the disturbance attenuation is achieved in the L2-gain sense. An example is provided to demonstrate the effectiveness of the proposed design scheme.