It is well known that when measuring sound transmission loss (STL) in a laboratory, among all test conditions, the location of a specimen in an aperture affects the results, due to the tunneling effect. Previous studies have considered this effect for flat single panels and double walls but the case of a panel with attached sound package seems to have received very little attention. This paper deals with the application of a modal approach to study the STL of a rectangular plate coupled with a porous material located inside a tunnel. The sound absorbing material is supposed to be described by a transfer matrix calculated using a Transfer Matrix Method, which relates interstitial pressure and total normal stress on both sides of the material. The model is validated by comparison with finite element/boundary element computations. Numerical results are shown to illustrate the validity of the proposed hybrid modal-TMM methodology and its use to investigate the niche effect in the presence of a sound absorbing material.
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May 2013
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May 01 2013
Tunneling effect on the sound transmission loss of a flat structure coupled with a porous material
Franck C. Sgard;
Franck C. Sgard
Direction Scientifique, IRSST, 505 Boulvd de Maisonneuve O, Montreal, QC H3A3C2, [email protected]
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Noureddine Atalla;
Noureddine Atalla
GAUS, Univ. of Sherbrooke, Montreal, QC, Canada
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Mohammad Gholami;
Mohammad Gholami
GAUS, Univ. of Sherbrooke, Montreal, QC, Canada
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Hugues Nelisse
Hugues Nelisse
Direction Scientifique, IRSST, Montreal, QC, Canada
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J. Acoust. Soc. Am. 133, 3241 (2013)
Citation
Franck C. Sgard, Noureddine Atalla, Mohammad Gholami, Hugues Nelisse; Tunneling effect on the sound transmission loss of a flat structure coupled with a porous material. J. Acoust. Soc. Am. 1 May 2013; 133 (5_Supplement): 3241. https://doi.org/10.1121/1.4805186
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