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Shock and Vibration
Volume 2014, Article ID 687340, 7 pages
Research Article

Confinement of Vibrations in Variable-Geometry Nonlinear Flexible Beam

1Applied Mechanics and Systems Research Laboratory, Tunisia Polytechnic School, BP 743, 2078 La Marsa, Tunisia
2National Engineering School of Sfax, BP 1137, 3038 Sfax, Tunisia
3Tunisia Polytechnic School, BP 743, 2078 La Marsa, Tunisia

Received 5 July 2012; Accepted 3 October 2013; Published 9 April 2014

Academic Editor: Mehdi Ahmadian

Copyright © 2014 W. Gafsi 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.


In this paper, we propose a novel strategy for controlling a flexible nonlinear beam with the confinement of vibrations. We focus principally on design issues related to the passive control of the beam by proper selection of its geometrical and physical parameters. Due to large deflections within the regions where the vibrations are to be confined, we admit a nonlinear model that describes with precision the beam dynamics. In order to design a set of physical and geometrical parameters of the beam, we first formulate an inverse eigenvalue problem. To this end, we linearize the beam model and determine the linearly assumed modes that guarantee vibration confinement in selected spatial zones and satisfy the boundary conditions of the beam to be controlled. The approximation of the physical and geometrical parameters is based on the orthogonality of the assumed linear mode shapes. To validate the strategy, we input the resulting parameters into the nonlinear integral-partial differential equation that describes the beam dynamics. The nonlinear frequency response curves of the beam are approximated using the differential quadrature method and the finite difference method. We confirm that using the linear model, the strategy of vibration confinement remains valid for the nonlinear beam.