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Proceedings Paper

Critical frequencies for large-scale resonance signatures from elastic bodies
Author(s): Michael F. Werby; Guillermo C. Gaunaurd
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Paper Abstract

Acoustic signals scattered from submerged elastic targets have produced interesting back- scattered signals in the appropriate frequency region, particularly because of the presence of resonances. Considerable work has been done for spherically and cylindrically shaped objects out to moderate frequencies for both solids and shells. Only recently, however, have researchers been reporting on results for elongated objects such as spheroidal solids and shells. Further, the higher frequency region for spheres has not been investigated extensively. This paper reports on a series of calculations that the authors have been involved with that are characteristic of elongated targets or of spherical shells at the higher frequency region. Some of the results that are discussed involve bending resonances due to obliquely incident plane waves on elongated objects and their relation to flexural resonances of beams (classes of resonances that are related to waves creeping along the longest and shortest meridians of a spheroid) flexural resonances (A0 resonances) for shells in the time domain at coincidence frequency, and high-frequency thickness effects when scattering from shells and their prediction based on flat plate theory. Several numerical examples are shown.

Paper Details

Date Published: 1 August 1991
PDF: 16 pages
Proc. SPIE 1471, Automatic Object Recognition, (1 August 1991);
Show Author Affiliations
Michael F. Werby, Naval Oceanographic and Atmospheric Research Lab. (United States)
Guillermo C. Gaunaurd, Naval Surface Warfare Ctr. (United States)

Published in SPIE Proceedings Vol. 1471:
Automatic Object Recognition
Firooz A. Sadjadi, Editor(s)

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