Sound Radiation of Stiffened and Unstiffened Plates in Water
Experimental investigations concerning the water-borne sound radiation from rectangular plates with free edges are carried out. For a plane steel plate 2 cm thick the bending wavelength is calculated according to the corrected plate equation with and without consideration of the radiation
load, and is compared with measurements. The effect of additional stiffenings, in the form of variously arranged ribs, on the resonance frequencies is experimentally determined by recording the velocity-frequency responses. From the measurement of the loss factors of the plates under free
and loaded conditions the radiation efficiency is calculated and compared with the Gosele approximations valid for the unstiffened plate. The directional distribution of the sound pressure in the far-field is computed using a simple valuation for the velocity distribution on the plate and
compared with the measured directional characteristic.
Document Type: Research Article
Publication date: 01 October 1974
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