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Title: Quasi-flat acoustic absorber enhanced by metamaterials
Authors: Azbaid El Ouahabi, Abdelhalim
Krylov, Victor V.
O'Boy, D.J.
Issue Date: 2015
Publisher: Acoustical Society of America
Citation: AZBAID EL OUAHABI, A., KRYLOV, V.V. and O'BOY, D.J., 2015. Quasi-flat acoustic absorber enhanced by metamaterials. Proceedings of Meetings on Acoustics, 22 (1), paper 040002, 14pp.
Abstract: In this paper, the design of a new quasi-flat acoustic absorber (QFAA) enhanced by the presence of the impedance matching metamaterial layer is described, and the results of the experimental investigation into the reflection of sound from such an absorber are reported. The gradient metamaterial layer is formed by a quasi-periodic array of brass cylindrical tubes with the diameters gradually increasing from the external row of tubes facing open air towards the internal row facing the absorbing layer made of a porous material. The QFAA is placed in a wooden box with the dimensions of 569 x 250 x 305 mm. All brass tubes are of the same length (305 mm) and fixed between the opposite sides of the box. Measurements of the sound reflection coefficients from the empty wooden box, from the box with an inserted porous absorbing layer, and from the full QFAA containing both the porous layer and the array of brass tubes have been carried out in an anechoic chamber at the frequency range of 500-3000 Hz. The results show that the presence of the metamaterial layer brings a noticeable reduction in the sound reflection coefficients in comparison with the reflection from the porous layer alone.
Description: Copyright 2015 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. This article appeared in Proceedings of Meetings on Acoustics and may be found at http://dx.doi.org/10.1121/2.0000010
Sponsor: The research reported here has been supported by EPSRC grant EP/K038214/1.
Version: Accepted for publication
DOI: 10.1121/2.0000010
URI: https://dspace.lboro.ac.uk/2134/18514
Publisher Link: http://dx.doi.org/10.1121/2.0000010
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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