Acoustic scattering from finite elastic cylinders

Abstract

Tank experiments on acoustic bistatic and backscattering from elastic cylinders with hemispherical endcaps have been performed at the University of Le Havre and at Catholic University. The resonances apparent in these experiments have been interpreted on the basis of the phase‐matching principle [H. Überall et al., J. Acoust. Soc. Am. 61, 771 (1977)] for surface waves that encircle these objects along closed geodesics. Upon axial incidence, the resonances of meridionally propagating surface waves are visible. Upon axial incidence, the resonances of meridionally propagating surface waves are visible. Upon broadside incidence, circumferential wave resonances are visible as well as the meridional ones. The frequencies of both types of resonances are explained very well by the phase‐matching principle. [Work supported in part by the David Taylor Res. Ctr.]