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Advances in Materials Science and Engineering
Volume 2015, Article ID 162782, 12 pages
http://dx.doi.org/10.1155/2015/162782
Research Article

Parallel Piezoelectric Shunt Damping of Rotationally Periodic Structures

1Active Structures Laboratory, Université Libre de Bruxelles, 50 Avenue Franklin Roosevelt, 1050 Brussels, Belgium
2Technical University “Gheorghe Asachi”, 67 Boulevard Professor Dimitrie Mangeron, 700050 Iasi, Romania
3Babes Bolyai University, 1 Mihail Kogalniceanu Street, 400084 Cluj-Napoca, Romania
4Groupe SAFRAN, Techspace Aero, 121 Route de Liers, 4041 Liège, Belgium

Received 15 December 2014; Revised 24 March 2015; Accepted 24 March 2015

Academic Editor: João P. Davim

Copyright © 2015 Bilal Mokrani 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.

Abstract

This paper considers the RL shunt damping of rotationally periodic structures with an array of regularly spaced piezoelectric patches. The technique is targeted to the damping of a specific mode with nodal diameters. For this particular case, one can take advantage of the shape of the targeted mode to organize the piezoelectric patches as a modal filter (in parallel loops) which reduces the demand on the inductors of the tuned inductive shunt. In the case of a perfectly rotationally periodic structure, it is possible to organize 4 piezoelectric transducers (PZT patches) in two parallel loops of 2 patches each. In this way, the demand on the inductors is reduced by as compared to independent loops, which may allow a fully passive integration of the RL shunt in a turbomachinery application. The method is first illustrated experimentally on a circular plate; it is then applied to a prototype of an industrial bladed drum. The influence of blade mistuning is investigated.