Resonance scattering of acoustic waves from cylindrical shells

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Abstract
The theory of resonance scattering, recently developed for acoustic wave scattering from elastic objects and elastic wave scattering from cavities, is applied to the problem of sound scattering from fluid-filled elastic cylindrical shells in a fluid; in particular, air-filled aluminum shells in water. The eigenvibrations of the shell appear as resonances in the scattering amplitude of each normal mode; these are superimposed on a smooth background which if the shell is made thinner, converts from the amplitude of a rigid to that of a soft cylinder. The resonances themselves are exhibited by subtracting the background from the total amplitude and are seen to become less numerous as the shell gets thinner. This paper is part of a series which investigates the excitation of target resonances in the scattering of acoustic and elastic waves using the theory of nuclear resonances [G. Breit and E. P. Wigner, Phys. Rev. 49, 519 (1936)]. [H. Überall was supported by the Office of Naval Research. Code 421 and E. D. Breitenbach by IR/IED at DTNSRDC.]

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