By Guran, Ardéshir; Ripoche, Jean; Ziegler, Franz (Eds.)
The interplay of acoustic fields with submerged elastic buildings, either by way of propagation and scattering, is being investigated at numerous associations and laboratories world-wide with ever-increasing sophistication of experiments and research. This e-book bargains a suite of contributions from those learn facilities that signify the current state of the art within the examine of acoustic elastic interplay, being at the innovative of those investigations. This contains the outline of acoustic scattering from submerged elastic gadgets and shells by means of the Resonance Scattering idea of Flax, Dragonette and Überall, and the interplay of those phenomena by way of interface waves. it is usually using this thought for the aim of inverse scattering; i.e. the selection of the scattered gadgets 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 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 obstacles is studied experimentally either in laboratory tanks, and within the box, and is analyzed theoretically. Ultrasonic nondestructive checking out, together with such features like probe modeling, scattering by means of numerous kinds of cracks, receiving probes and calibration through a side-drilled gap is additionally studied in info.
desk of Contents
1. The Resonances: From Nuclear Physics to Underwater Acoustics
2. RST and Peripheral Waves
three. Acoustic Scattering from Internally Loaded Cylindrical Shells
four. Scattering through Cylindrical items at indirect occurrence
five. Nonspecular Reflection-Transmission Phenomena of Bounded Beams defined by way of Inhomogeneous airplane Waves
6. mirrored image and Refraction of the Inhomogeneous airplane Wave
7. idea of the Acoustic Bounded Beam
eight. Sound Scattering via a Fluid-Loaded Cylindrical Shell with an inner Axial Stiffener
nine. Interferences in Elastic Plates
10. Vibrations of Shells Contacting Fluid: Asymptotic research
application of the Symposium in Honor of Professor Herbert Überall
in regards to the Editors
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Extra info for Acoustic Interactions with Submerged Elastic Structures
On this basis the characteristic, but non-standard, features of the scattering process are considered. 1. Normal and Peripheral Waves In a plane "dry" (without any contact with a liquid) layer the normal (Lamb-type) harmonica1 waves can be generated. They can be divided into two groups: in one of them the displacements of the layer are symmetrical with respect to the middle surface of the layer, and in the other they are antisymmetrical. From the boundary conditions on the free surfaces the dispersion equations can be obtained, which we shall write in the form56 E=0, F=O (1) for symmetrical and antisymmetrical waves correspondingly.
At scattering by an ”acoustic soft” body t h e halfwidth of the modal resonance is nearly twice as big as the relevant value at scattering by an ”acoustic rigid” body. Although the main carrier of the Franz waves is the ambient liquid, nevertheless t h e waves ”feel” that, they are propagating on t h e compliant (elastic) boundary. With large values of h ( h 1) the parameters of t h e modal resonances are close to those at scattering by an acoustic rigid body; with t h e diminishing of the relative thickness of the shell they change: the resonance frequency diminishes, and t h e halfwidth increases; a t small values of h ( h 1/1000) t h e parameters of t h e modal resonances are close to those a t scattering by an acoustic soft body (Table 1).
A. E. Ushleghi, Electromagnetic and Acoustic Scattering by Simple Shapes (North-Holland, Amsterdam, 1969). 14. Felsen and N. Marcuvitz, Radiation and Scattering of Waves (Prentice-Hall, Englewood Cliffs, New York, 1973). 15. -H. C. Mow, Diffraction of Elastic Waves and Dynamic Stress Concentrations (Crane and Russak, New York, 1973). 16. K. V. Varadan (Pergamon, New York, 1980). 17. C. Junger and D. Feit, Sound, Structures, and Their Interaction (MIT, Cambridge, MA, 1986). 18. N. Gespa, La digusion acoustique (Cedocar, Paris, 1987).
Acoustic Interactions with Submerged Elastic Structures by Guran, Ardéshir; Ripoche, Jean; Ziegler, Franz (Eds.)