By Guran, Ardéshir; Ripoche, Jean; Ziegler, Franz (Eds.)
The interplay of acoustic fields with submerged elastic constructions, either by means of propagation and scattering, is being investigated at quite a few associations and laboratories world-wide with ever-increasing sophistication of experiments and research. This publication bargains a set of contributions from those study facilities that symbolize the current state of the art within the examine 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 concept of Flax, Dragonette and Überall, and the interplay of those phenomena when it comes to interface waves. it's also 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 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 limitations 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 way of quite a few varieties of cracks, receiving probes and calibration via a side-drilled gap can also be 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 by means of Cylindrical gadgets at indirect occurrence
five. Nonspecular Reflection-Transmission Phenomena of Bounded Beams defined by means of Inhomogeneous airplane Waves
6. mirrored image and Refraction of the Inhomogeneous airplane Wave
7. thought of the Acoustic Bounded Beam
eight. Sound Scattering by means of 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
concerning the Editors
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Extra resources for Acoustic Interactions with Submerged Elastic Structures
Am. 96 (1994) 287. 2. RST and Peripheral Waves 43 67. D. Veksler, Acoustics Letters 16 (1992) 78. 68. C. F. Werby, J . Acoust. A m . 77 (1985) 2081. 69. C. F. Werby, J . Acoust. A m . 8 2 (1987) 2021. 70. S. H. H. Hackman, J . Acoust. A m . 85 (1989) 114. 71. D. Veksler, Proc. Estonian Acad. Sci. Phys. Math. 40 (1991) 288. 72. LA. Viktorov, Raylezgh and Lamb Waves (Plenum, New York, 1967). 73. D. Veksler, Acustica 80 (1994) 35. 74. N. Veksler, Proc. Estonian Acad. Sci. Phys. Math. 39 (1990) 258.
4,5]. 34 N. Veksler resonances with strongly overlapping resonance curves on the x axis, being almost in antiphase for the successive values of n numbers, are named hidden r e s o n i ~ n c e s . ~ ~ * ~ ~ As a rule, the positions of the extrema of the superposition of hidden resonances differ from those of modal resonance frequencies, and depend on the contributions inserted not by one, but by several resonances. It is typical that the maximum value of the contribution of the superposition of all the So wave resonances is smaller than the smallest amplitude of the resonance.
5. The form function of the pressure backscattered by a circular cylindrical shell. The computation is carried out for an aluminium shell (with h= 1/5) immersed in water [73,Fig. 21. N. Veksler 32 1 T In i xFig. 7. The modal resonances of the S1 wave [73,Fig. 31. 80 2. 00 I 1 I I I I 55 , , 1 \ I V 1 I I I 1 I 60 , ,, I I I I I I I I I I I I. 65 I 75 80 -X Fig. 8. The result of superposition of all modal resonances in a restricted frequency range 55 < z < 80 of a) So wave; b) S1 wave [73,Figs. 4,5].