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Acoustic Interactions With Submerged Elastic Structures: by Ardeshir Guran, Gerard Maugin, Juri Engelbrecht, Michael

By Ardeshir Guran, Gerard Maugin, Juri Engelbrecht, Michael Werby, Herbert Uberall

The interplay of acoustic fields with submerged elastic constructions, either through propagation and scattering, is being investigated at a number of associations and laboratories world-wide with ever-increasing sophistication of experiments and research. This e-book deals a suite of contributions from those examine centres that symbolize the current state of the art within the research of acoustic elastic interplay, being at the leading edge of those investigations. This contains the outline of acoustic scattering from submerged elastic gadgets and shells through the resonance scattering concept of Flax, Dragonette and Uberall, and the interplay of those phenomena when it comes to interface waves. additionally it is using this conception for the aim of inverse scattering, i.e. the selection of the scattered items houses from the acquired 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 several 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 elements like probe modelling, scattering by means of a number of different types of cracks, receiving probes and calibration via a side-drilled gap is usually studied in information. A finished photo of those complicated phenomena and different facets is gifted within the e-book via researchers which are specialists in each one of those domain names, giving up to date debts of the sector in a majority of these facets.

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Extra info for Acoustic Interactions With Submerged Elastic Structures: Propagation, Ocean Acoustics and Scattering (Series on Stability, Vibration and Control of Systems, Series B, Vol 5) (v. 2)

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3. Theoretical and experimental investigations of modulation of plane, cylindrical, and spherical waves, as well as quasi-plane wave bundles by nonstationary dynamic fields have been carried out, which served as a basis when elaborating a new method of measuring dynamic stresses. 4. Theoretical study was performed of propagation of plane stationary elastic waves in a damaged medium. Relations between the main parameters of the wave (velocity, amplitude, frequency) and the material damage have been established.

5. J. A. Clarkson, Solitons, Nonlinear Evolution Equations and Inverse Scattering (Cambridge University Press, Cambridge, 1991). 6. T. Taniuti and K. , 1983). 7. J. Engelbrecht and Y. Khamidullin, Phys. Earth Plan. Inter. 50 (1988) 39. 8. B. Whitham, Linear and Nonlinear Waves (Wiley, New York, 1974). 9. A. Maugin, J. Non-Equilib. Thermodyn. 15 (1990) 173. 10. A. Maugin and W. Muschik, J. Non-Equilib. Thermodyn. 19 (1994) 217 (Part I) 250 (Part II). 11. A. Maugin, J. Mech. Phys. Solids 40 (1992) 1543.

T h e issues of elastic wave propagation in solids with m i c r o s t r u c t u r e have been t h e s u b j e c t of our s t u d y since 1984. T h e last some years saw t h e following m a j o r results: 41 42 V. I. Erofeyev 1. The equations of dynamics, the laws of variation of the energy and the wave momentum have been derived with the help of Hamilton-Ostrogradsky variational principle and using the hypotheses of the moment theory of elasticity and deformation thermodynamics for the solids with microstructure, damage,geometrical and physical nonlinearities, as well as interaction between deformation and magnetic fields.

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