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Disturbance observer based control for nonlinear systems

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1 Author(s)
Wen-Hua Chen ; Dept. of Aeronaut. & Automotive Eng., Loughborough Univ., UK

This work presents a general framework for nonlinear systems subject to disturbances using disturbance observer based control (DOBC) techniques. A two-stage design procedure to improve disturbance attenuation ability of current linear/nonlinear controllers is proposed where the disturbance observer design is separated from the controller design. To facilitate this concept, a nonlinear disturbance observer is developed for disturbances generated by an exogenous system, and global exponential stability is established under certain condition. Furthermore, semiglobal stability condition of the composite controller consisting of a nonlinear controller and the nonlinear disturbance observer is established. The developed method is illustrated by the application to control of a two-link robotic manipulator.

Published in:

Mechatronics, IEEE/ASME Transactions on  (Volume:9 ,  Issue: 4 )

Date of Publication:

Dec. 2004

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