By Hans A Bethe; A Guran; Herbert Überall; et al
Read Online or Download Acoustic interactions with submerged elastic structures. : Part III, Acoustic propagation and scattering, wavelets, and time frequency analysis a Herbert Überall festschrift volume PDF
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Additional info for Acoustic interactions with submerged elastic structures. : Part III, Acoustic propagation and scattering, wavelets, and time frequency analysis a Herbert Überall festschrift volume
At the lower frequencies, basement interaction is no longer negligible and the erroneous inputs show their effects. A series of S A F A R I runs were made to determine the degree of influence of the semi-infinite concrete basement at the four frequencies of interest. These additional runs were m a d e without the concrete basement. Instead, the bottom was modeled as a semi-infinite epoxy basement. The resulting transmission loss contour showed a negligible variation of the field at 25 and 30Hz, a somewhat poorer propagation at 20Hz, and a totally different field at 15Hz.
The best agreement was obtained at high frequencies and a typical result is shown in figure 2 0 for a source frequency of 110kHz . The plot shows the propagation loss as function of across slope range. There is excellent agreement between the measurements and the predictions at this frequency, and the only discrepancy occurs where the experimental levels reach the noise floor at a propagation loss of 12dB. Note that the shadow zone is clearly identified and tiiat the details of the interference pattern in the acoustic field is well predicted by the source image theory.
Downstope enhancement was atso investigated by Dosso and Chapman^** off the west coast of Canada. This experiment took ptace over the deep ocean basin, at a depth of 2500 meters, the continental siope, which was etevated nominally at 5 degrees, and the continental shelf, at an average depth of 150 meters. O n the continental slope, a pinnacle from an ocean bottom ridge is present. T w o ships were used in the experiment, the first ship dropped S U S charges which were detonated at a depth of 22 meters.
Acoustic interactions with submerged elastic structures. : Part III, Acoustic propagation and scattering, wavelets, and time frequency analysis a Herbert Überall festschrift volume by Hans A Bethe; A Guran; Herbert Überall; et al
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