Acoustic Interactions With Submerged Elastic Structures: by Ardeshir Guran, Adrianus De Hoop, Dieter Guicking, Francesco

By Ardeshir Guran, Adrianus De Hoop, Dieter Guicking, Francesco Mainardi

The interplay of acoustic fields with submerged elastic buildings, either via propagation and scattering, is being investigated at numerous associations and laboratories world-wide with ever-increasing sophistication of experiments and research. This e-book deals a set of contributions from those examine centres that signify the current cutting-edge within the learn of acoustic elastic interplay, being at the leading edge of those investigations. This contains the outline of acoustic scattering from submerged elastic items and shells by way of the resonance scattering conception of Flax, Dragonette and Uberall, and the interplay of those phenomena when it comes to interface waves. it is usually using this thought for the aim of inverse scattering, i.e. the decision of the scattered gadgets homes from the obtained acoustic backscattered indications. the matter of acoustically excited waves in inhomogeneous and anisotropic fabrics, and of inhomogeneous propagating waves is taken into account. Vibrations and resonances of elastic shells, together with shells with different types of inner attachments, are analyzed. Acoustic scattering experiments are defined within the time area, and at the foundation of the Wigner-Ville distribution. Acoustic propagation within the water column over elastic barriers is studied experimentally either in laboratory tanks, and within the box, and is analyzed theoretically. Ultrasonic nondestructive checking out, together with such facets like probe modelling, scattering by means of numerous forms of cracks, receiving probes and calibration by way of a side-drilled gap is additionally studied in info. A complete photograph of those complicated phenomena and different facets is gifted within the ebook by means of researchers which are specialists in every one of those domain names, giving up to date money owed of the sector in a majority of these points.

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Extra resources for Acoustic Interactions With Submerged Elastic Structures: Acoustic Propagation and Scattering, Wavelets and Time Frequency Analysis (Series on Stability, ... and Control of Systems. Series B, V. 5)

Example text

8 R A N G E (km) i . . 2 Figure 5c. Predicted propagation field by K R A K E N C for 2 0 H z signal. Figure 5d. Predicted propagation field by F E P E S for 2 0 H z signal. S A F A R t at ranges shorter than about ten times the water depth for the expected contribution of the radiating wavenumber spectra. The agreement in these figures indicates that the waveguide's hard layered bottom is damping this energy faster than expected. Figures 5 display the results at 20Hz. Note that S A F A R t predicts that sound propagates farther 3.

This correction is precisely the same as was proposed by Buckingham'^ for the penetrable wedge problem. In that theory only a fluid bottom w a s considered and so the reflection coefficient was taken as having unit amplitude for small grazing angles. Buckingham was then able to derive equivalent wedge modes for the penetrable wedge. This theory was based on intuitive arguments and here w e have shown that by using the method of images the same correction for the penetrable bottom can be achieved.

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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