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Acoustic analysis and parametric studies of lagged pipes

Munjal, ML (1997) Acoustic analysis and parametric studies of lagged pipes. In: Noise Control Engineering Journal, 45 (3). pp. 113-118.

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Pipelines of noisy air or steam flow systems are often lagged on the outside with an acoustically absorptive, highly porous material which in turn is covered with a thin impervious (metallic) jacket. Prediction of transverse insertion loss (reduction in break-out noise) due to this composite lagging is the subject of the present paper. A transfer matrix for the porous absorptive layer is derived for cylindrical waves in the radial direction. Making use of an impedance model, radial velocities of the bare pipe and the outer jacket for the lagged pipe are calculated. These are then combined with respective radiation impedances to calculate insertion loss due to the composite lagging as well as the bare (unconstrained) lagging. Predicted values of insertion loss are compared with the measured values from literature. Finally results of parametric studies are presented.

Item Type: Journal Article
Publication: Noise Control Engineering Journal
Publisher: Cairo Univ
Additional Information: Copyright of this article belongs to Cairo Univ.
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 07 Mar 2007
Last Modified: 25 Oct 2011 12:00
URI: http://eprints.iisc.ac.in/id/eprint/9564

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