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

Venkatesham, B. ; Tiwari, Mayank ; Munjal, M. L. (2010) Analytical prediction of break-out noise from a reactive rectangular plenum with four flexible walls Journal of the Acoustical Society of America, 128 (4). pp. 1789-1799. ISSN 0001-4966

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Official URL: http://asadl.org/jasa/resource/1/jasman/v128/i4/p1...

Related URL: http://dx.doi.org/10.1121/1.3463801

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.

Item Type:Article
Source:Copyright of this article belongs to Acoustical Society of America.
Keywords:Acoustic Impedance; Acoustic Noise; Boundary-elements Methods; Finite Element Analysis; Structural Acoustics
ID Code:73661
Deposited On:07 Dec 2011 05:32
Last Modified:07 Dec 2011 05:32

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