Abstract
Numerical results are presented here to the problem of scattering of acoustic waves from infinite elastic elliptic cylinders under water. The T-matrix (or null field) method has been used to evaluate the scattered field coefficients. Comparisons have been drawn between the form functions of a rigid (acoustically hard) cylinder and an elastic cylinder of similar geometry. The smooth periodic form function of the rigid cylinder is analyzed on the basis of the existence of Franz waves (creeping waves), while the sharp peaks in the elastic cylinder case have been interpreted as due to resonance effects of the submerged cylinder. Though, in general, it is possible to distinguish between the two kinds of targets from the scattering pattern (polar plots at fixed frequencies), it is observed that at ka = 5.0, one cannot distinguish between a rigid cylinder and an elastic cylinder.
Published Version
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