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Title: Damping of flexural vibrations in plates containing ensembles of tapered indentations of power-law profile
Authors: Bowyer, E.P.
O'Boy, D.J.
Krylov, Victor V.
Issue Date: 2013
Publisher: © Acoustical Society of America (Published by the Acoustical Society of America through the American Institute of Physics)
Citation: BOWYER, E.P., O'BOY, D.J. and KRYLOV, V.V., 2013. Damping of flexural vibrations in plates containing ensembles of tapered indentations of power-law profile. Proceedings of Meetings on Acoustics - 164th Meeting of the Acoustical Society of America, Kansas City, Missouri, 22-26 October 2012, 18, 030003, 11pp.
Abstract: In this work, we report experimental results on damping flexural vibrations in rectangular plates containing tapered indentations (pits) of power-law profile, the centres of which are covered by a small amount of absorbing material. In the case of quadratic or higher-order profiles, such indentations materialise two-dimensional acoustic 'black holes' for flexural waves. Initially, the effects of single pits have been investigated. It has been found that, in order to increase the damping efficiency of power-law profiled indentations, their absorption crossections should be enlarged by drilling a central hole of sufficiently large size (14 mm), while keeping the edges sharp. Such pits, being in fact curved power-law wedges, result in substantially increased damping. The next and the major part of this investigation involved using multiple indentations in the same rectangular plates to increase damping. Plates with combinations from two to six equal indentations have been investigated. The results show that, when multiple indentations are used, the associated damping increases substantially with the increase of a number of indentations. For the plate with 6 indentations, the resulting damping becomes comparable if not greater than that achieved by a wedge of power-law profile.
Description: This article was published in the Proceedings of Meetings on Acoustics - 164th Meeting of the Acoustical Society of America [© Acoustical Society of America]. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.
Version: Published
DOI: 10.1121/1.4776153
URI: https://dspace.lboro.ac.uk/2134/11512
Publisher Link: http://dx.doi.org/10.1121/1.4776153
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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