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Shock and Vibration
Volume 14, Issue 2, Pages 81-88
http://dx.doi.org/10.1155/2007/102371

Radiation Efficiencies for Steel Plates in Water

M.L. Rumerman

Naval Surface Warfare Center Carderock Division, Ship Signatures Department – Code 7204, 9500 MacArthur Boulevard, West Bethesda, MD 20817-5700, USA

Received 3 April 2007; Revised 3 April 2007

Copyright © 2007 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Statistical Energy (or similar) Analysis may use radiation efficiencies as a means of estimating acoustic power radiated by plates in bending vibration. It is common to calculate them using uncoupled sinusoidal mode shapes of simply supported plates to account for the plate boundaries and rib stiffeners. This paper shows that, when applied to steel plates bounded by water on one side, this procedure can significantly overestimate the acoustic power radiated for frequencies below about one-eighth of the coincidence frequency. With water on both sides of the plate, the cutoff is increased to about one-fourth of coincidence.