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Prediction of the break-out noise of the cylindrical sandwich plate muffler shells

Munjal, ML (1998) Prediction of the break-out noise of the cylindrical sandwich plate muffler shells. In: Applied Acoustics, 53 (1-3). pp. 153-161.


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Break-out noise from the shell often puts a limit on the (net) transmission loss that can be obtained from an engine exhaust muffler. One of the best ways of reducing break-out noise is use of a sandwich plate shell. This short paper presents an analytical model for prediction of transverse transmission loss of sandwich plate shells. Four-pole parameters of the porous layer are used along with an impedance approach for relating radial velocity of the outer (exposed) metallic layer to acoustic pressure of a plane progressive wave inside the muffler shell. This is combined with radiation impedance for outgoing cylindrical waves to predict transverse transmission loss. Thus, a sandwich plate shell is compared with a single layer shell without and with wrapping of another metallic layer by means of a transverse insertion loss. Finally, results of a parametric study are reported to help the muffler designers.

Item Type: Journal Article
Publication: Applied Acoustics
Publisher: Elsevier Science Ltd
Additional Information: The copyright for this article belongs to Elsevier Science Ltd
Keywords: Break-out noise;muffler;sandwich plate;noise control
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 13 Aug 2004
Last Modified: 19 Sep 2010 04:14
URI: http://eprints.iisc.ac.in/id/eprint/1269

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