Download e-book for kindle: Acoustic interactions with submerged elastic structures. : by Hans A Bethe; A Guran; Herbert Überall; et al

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

ISBN-10: 9812810757

ISBN-13: 9789812810755

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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

Example text

V'E^ 2V/j-s. of' f being an externa] force, O = V-^, and the strain tensor is (t = transpose) This equation must be solved for a waveguide with a pressure-release surface and an elastic layered bottom. At low frequencies, bottom penetration is expected and wave-theory based models are suitable. The S A F A R I model' is a fast-field approach developed by Henrik Schmidt. This rangeindependent model uses a direct, global matrix approach to determine the depth-dependent Green function. It directly evaluates the contour integral numerically to obtain the acoustic pressure field.

T o obtain the sound field characteristics, the glass plate was painted with a water soluble paint. W h e n the region w a s insonified using a frequency of 1 M H z , the variation of the sound level on the sloping bottom appeared on the painted surface, showing the interference pattern illustrated in figure 2. T o evaluate the acoustic Held in the water column Tindle et al" measured the propagation of modes directly downslope of the source. They generated individual modes by using an array of transducers which preferentially excited only one m o d e in the water column.

5 c m from the w e d g e apex, and the receiver w a s traversed through the acoustic field. Both transducers were placed at middepth to maximize the acoustic field and signal-to-noise ratio. A typical result is illustrated in figure 16, which shows a comparison between the measurement and the theoretical calculations discussed in the previous section. This result shows h o w the level changes as the observer m o v e s in the across-slope z direction at two different fixed down-slope ranges. 66 c m , respecdvely.

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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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