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Acoustic performance of hoses - A parametric study

Munjal, ML and Thawani, PT (1996) Acoustic performance of hoses - A parametric study. In: Noise Control Engineering Journal (NCEJ), 44 (6). pp. 274-280.

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Official URL: http://www.inceusa.org/publications/ncej

Abstract

Modeling of wave propagation in hoses, unlike in rigid pipes or waveguides, introduces a coupling between the inside medium, the hose wall, and the outside medium, This alters the axial wave number and thence the corresponding effective speed of sound inside the hose resulting in sound radiation into the outside medium, also called the breakout or shell noise, The existing literature on the subject is such that a hose cannot be integrated into the,whole piping system made up of sections of hoses, pipes, and mufflers to predict the acoustical performance in terms of transmission loss (TL), The present paper seeks to fill this gap, Three one-dimensional coupled wave equations are written to account for the presence of a yielding wall with a finite lumped transverse impedance of the hose material, The resulting wave equation can readily be reduced to a transfer matrix form using an effective wave number for a moving medium in a hose section, Incorporating the effect of fluid loading due to the outside medium also allows prediction of the transverse TL and the breakout noise, Axial TL and transverse TL have been combined into net TL needed by designers, Predictions of the axial as well as transverse TL are shown to compare well with those of a rigorous 3-D analysis using only one-hundredth of the computation time, Finally, results of some parametric studies are reported for engineers involved in the acoustical design of hoses. (C) 1996 Institute of Noise Control Engineering.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to The Institute of Noise Control Engineering of the USA (INCE/USA).
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Others
Date Deposited: 19 May 2011 08:27
Last Modified: 19 May 2011 08:27
URI: http://eprints.iisc.ernet.in/id/eprint/36996

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