Analytical prediction of break-out noise from a reactive rectangular plenum with four flexible walls

Venkatesham, B and Tiwari, Mayank and Munjal, ML (2010) Analytical prediction of break-out noise from a reactive rectangular plenum with four flexible walls. In: Journal of the Acoustical Society of America, 128 (4). pp. 1789-1799.

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Abstract

This paper describes an analytical calculation of break-out noise from a rectangular plenum with four flexible walls by incorporating three-dimensional effects along with the acoustical and structural wave coupling phenomena. The breakout noise from rectangular plenums is important and the coupling between acoustic waves within the plenum and structural waves in the flexible plenum walls plays a critical role in prediction of the transverse transmission loss. The first step in breakout noise prediction is to calculate the inside plenum pressure field and the normal flexible plenum wall vibration by using an impedance-mobility approach, which results in a compact matrix formulation. In the impedance-mobility compact matrix (IMCM) approach, it is presumed that the coupled response can be described in terms of finite sets of the uncoupled acoustic subsystem and the structural subsystem. The flexible walls of the plenum are modeled as an unfolded plate to calculate natural frequencies and mode shapes of the uncoupled structural subsystem. The second step is to calculate the radiated sound power from the flexible walls using Kirchhoff-Helmholtz (KH) integral formulation. Analytical results are validated with finite element and boundary element (FEM-BEM) numerical models. (C) 2010 Acoustical Society of America. DOI: 10.1121/1.3463801]

Item Type:	Journal Article
Publication:	Journal of the Acoustical Society of America
Publisher:	American Institute of Physics
Additional Information:	Copyright of this article belongs to American Institute of Physics.
Keywords:	acoustic impedance, acoustic noise, boundary-elements methods, finite element analysis, structural acoustics
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	13 Nov 2010 10:16
Last Modified:	13 Nov 2010 10:16
URI:	http://eprints.iisc.ac.in/id/eprint/33655

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