Impedance of acoustic and structural waveguides at their cutoff frequencies

Junger, Miguel C.

doi:10.1121/1.381830

Cited by 3 publications

(4 citation statements)

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“…28-31. The pertinent relations are given by Eqs (81) and (82). The isobars, normalized to po, are displayed for kja = 10 in Fig.…”

Section: Experimental Implementation Of Rst Predictionsmentioning

confidence: 99%

“…We note in closing this section that resonance-type expressions containing certain denominators made up of two terms, one being the acoustic and the other the mechanical impedances of the structure, were developed in the past [85], but no attempt was ever made to extract from these expressions [82][83][84] a resonance-scattering formalism.…”

Section: P(b)mentioning

confidence: 99%

“…These have resulted in improvements in identification methods, and also in masking techniques. These bilateral advances have been ongoing for five decades in various regions of the acoustic spectrum [115,125,11,[80][81][82][83][84][85][86][87], Most targets of underwater acoustics interest are either solid elastic bodies or hollow elastic shells. We have already studied elastic solid bodies and inclusions in solids elsewhere [42,12,43], and it now remains to address the more important case of elastic shells.…”

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confidence: 99%

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Acoustic Resonance Scattering by Submerged Elastic Shells

Gaunaurd

Werby²

1990

Applied Mechanics Reviews

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We review a number of instances in which classical acoustic wave scattering from submerged elastic shells can be analyzed in the resonance region of their spectra. We recently reviewed (Refs 42,43,12) the cases dealing with acoustic resonance scattering from solid elastic bodies, or with elastic resonance scattering from fluid or solid inclusions in elastic media. It only remains for us to address the works dealing with submerged shells, which we analyze here. We study scattering by bare or viscoelastically coated spherical and cylindrical shells in water, by means of (exact) normal-mode solutions, and by spheroidal shells by numerical approaches, particularly via the T-matrix method. We consider the shell responses mostly in unbounded media and when the interrogating waves are plane and c.w., although some recent findings valid for pulsed incidences and in the vicinity of environmental boundaries are also included. We use the methodology of the resonance scattering theory (RST) as much as possible, emphasizing its post-1981 results. High-frequency findings, obtained by asymptotic methods, are extrapolated to lower frequencies, to confirm RST predictions for the intermediate spectral regions in which the most important structural resonances are known to reside. A large number of bibliographical entries are collected and discussed in connection with our approach.Downloaded From: http://appliedmechanicsreviews.asmedigitalcollection.asme.org/ on 05/24/2015 Terms of Use: http://asme.org/terms Gaunaurd and Werby: Acoustic resonance scattering

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“…28-31. The pertinent relations are given by Eqs (81) and (82). The isobars, normalized to po, are displayed for kja = 10 in Fig.…”

Section: Experimental Implementation Of Rst Predictionsmentioning

confidence: 99%

Section: P(b)mentioning

confidence: 99%

mentioning

confidence: 99%

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Acoustic Resonance Scattering by Submerged Elastic Shells

Gaunaurd

Werby²

1990

Applied Mechanics Reviews

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“…This frequency will be the natural frequency of the corresponding standing wave mode of the waveguide cross-section along the y axis , 18 and thus may be calculated by setting the x-direction wavenumber (k) equal to zero in the equation of motion (E q. 11).…”

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confidence: 99%