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Effect of protective layer on the performance of absorptive ducts

Munjal, ML and Thawani, PT (1997) Effect of protective layer on the performance of absorptive ducts. In: Noise Control Engineering Journal, 45 (1). pp. 14-18.

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Acoustically absorptive lining in ducts and parallel-baffle mufflers is invariably protected from the abrasive effect of grazing flow and dust by means of a protective layer in the form of highly porous thin metallic plate or cloth, or a very thin impervious layer of synthetic material like Mylar. An investigation of effects of protective layers on the acoustic performance of lined circular ducts and parallel-baffle mufflers (modeled as two-dimensional rectangular ducts) is the subject of this paper. Analytical models are presented for both cases with bulk reacting as well as locally reacting absorptive linings protected by a perforated or un-perforated layer, These simple models based upon a stationary inviscid medium are then used in a parametric study to provide noise control engineers with necessary design information, The effect of grazing flow on the impedance of a perforated protective plate is duly accounted for in the model.

Item Type: Journal Article
Publication: Noise Control Engineering Journal
Publisher: Institute of Noise Control Engineering of the USA
Additional Information: Copyright of this article belongs to Institute of Noise Control Engineering of the USA.
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 02 Jun 2009 06:51
Last Modified: 02 Jun 2009 06:51
URI: http://eprints.iisc.ac.in/id/eprint/18901

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