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Multi-focus design of underwater noise control linings based on finite element analysis

Panigrahi, SN and Jog, CS and Munjal, ML (2008) Multi-focus design of underwater noise control linings based on finite element analysis. In: Applied Acoustics, 69 (12). pp. 1141-1153.

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Varied, counter-demanding objectives in designing the underwater noise control linings are addressed using a finite element model based methodology. Four different kinds of designs are proposed to attend to diverse and conflicting requirements concerning echo reduction (ER) and transmission loss (TL) performance of these linings. In this regard a slightly modified hybrid type finite element based on the Pian and Tong (PT) formulation has been used to make the computational efforts less demanding as compared to the original one. The adequacy of this formulation has been shown by comparing its results with the analytical, finite element analysis based, and experimental results. Different unit cell representations for different types of distributions of air cavities on the linings are discussed with respect to their limitations and applicability. Effect of static pressure is studied by using a simplified technique which can be used to simulate deep sea testing environment. Performance variation of different designs is investigated under different water depths to study their applicability in such situations.

Item Type: Journal Article
Publication: Applied Acoustics
Publisher: Elsevier Science
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Underwater acoustics;Noise control;Anechoic lining; Insulation lining;Combination lining.
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 29 Oct 2009 07:08
Last Modified: 19 Sep 2010 04:57
URI: http://eprints.iisc.ac.in/id/eprint/17552

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