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Mathematical Problems in Engineering
Volume 2014 (2014), Article ID 361418, 14 pages
Research Article

Numerical and Experimental Modal Control of Flexible Rotor Using Electromagnetic Actuator

School of Mechanical Engineering, Federal University of Uberlândia, Avenue João Naves de Ávila 2121, Campus Santa Mônica, Uberlândia 38408-100, MG, Brazil

Received 11 February 2014; Revised 31 March 2014; Accepted 31 March 2014; Published 30 April 2014

Academic Editor: Weichao Sun

Copyright © 2014 Edson Hideki Koroishi 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.


The present work is dedicated to active modal control applied to flexible rotors. The effectiveness of the corresponding techniques for controlling a flexible rotor is tested numerically and experimentally. Two different approaches are used to determine the appropriate controllers. The first uses the linear quadratic regulator and the second approach is the fuzzy modal control. This paper is focused on the electromagnetic actuator, which in this case is part of a hybrid bearing. Due to numerical reasons it was necessary to reduce the size of the model of the rotating system so that the design of the controllers and estimator could be performed. The role of the Kalman estimator in the present contribution is to estimate the modal states of the system and to determine the displacement of the rotor at the position of the hybrid bearing. Finally, numerical and experimental results demonstrate the success of the methodology conveyed.