Hans A Bethe; A Guran; Herbert Überall; et al's Acoustic interactions with submerged elastic structures. : PDF

By Hans A Bethe; A Guran; Herbert Überall; et al

ISBN-10: 9812810757

ISBN-13: 9789812810755

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Additional resources for Acoustic interactions with submerged elastic structures. : Part III, Acoustic propagation and scattering, wavelets, and time frequency analysis a Herbert Überall festschrift volume

Sample text

At 25Hz, the wavelength is nearly equal to the sediment thickness. 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.

X^ j=l j=l ;=1 ^=1 where (28) ^')=2AXn, ;=i A = -;'wag(Z)/^ 18 S. /I. L. CZegg and J. M. R^ey The acoustic field is then obtained as before by writing the field in the form (29) ^=Ax n'^y)' i J ^ — ^ ^ - n^^/)' i J -—^—^*; U=i J-^-=. ^y where the angle of incidence onto each surface is n o w taken as die angle from the source displaced by x,/-" rather than the actual source position. This leads to an expression for the acoustic field which is identical to (21) but with -V replaced by the magnitude of the reflection coefficient and the source images shifted by x/-')=(x/-",y/^,0).

Acci^f. &3C. , 95, pp 2437-2440, 1994 Acoustic Interactions with Submerged Elastic Structures, Part III, pp. 31-54 edited by A. Guran, A. D e Hoop, D. Guicking and F. on and Control of Systems Series B/ Vo^. ) World Scientific Publishing Company M O D E L I N G O F S O U N D PROPAGATION O V E R A SHEAR-SUPPORTING SEDIMENT LAYER A N D SUBSTRATE J U A N I. , D C 20064 A series of model tank measurements carried out by Glegg et al. at Florida Atlantic University (FAU) has furnished data for range-independent and for downslope sound propagation over consolidated bottom sediments simulating the ocean floor.

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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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