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Shock and Vibration
Volume 2014, Article ID 809173, 8 pages
Research Article

Improving Delay-Margin of Noncollocated Vibration Control of Piezo-Actuated Flexible Beams via a Fractional-Order Controller

1Department of Mechanical and Aerospace Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
2Institute of General Mechanics, RWTH Aachen University, D-52056 Aachen, Germany

Received 27 February 2014; Accepted 19 March 2014; Published 31 March 2014

Academic Editor: Vadim V. Silberschmidt

Copyright © 2014 Teerawat Sangpet et al. 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.


Noncollocated control of flexible structures results in nonminimum-phase systems because the separation between the actuator and the sensor creates an input-output delay. The delay can deteriorate stability of closed-loop systems. This paper presents a simple approach to improve the delay-margin of the noncollocated vibration control of piezo-actuated flexible beams using a fractional-order controller. Results of real life experiments illustrate efficiency of the controller and show that the fractional-order controller has better stability robustness than the integer-order controller.