An Inferential Treatment of Resonance Scattering from Elastic Shells
NAVAL OCEANOGRAPHIC AND ATMOSPHERIC RESEARCH LAB STENNIS SPACE CENTER MS
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One can extract both the existence and nature of resonances on elastic shells by direct measurement of surface vibrations or one may infer this information by examining various aspects of farfield scattering via back scattered echos and residual bistatic angular distributions. The origin of the inferential method is contained in the prodigious work of Uberall over the past decades. In this study the later technique is taken and an analysis for recently studied resonances is presented. Use is made of the recently formulated acoustic background for elastic shells which makes it possible to examine residual back scattered echos characterized by pure resonance effects. One observes the lowest order symmetric and antisymmetric model or Lamb resonances as well as water borne and pseudo-Stoneley resonances and the higher order Lamb modes Ai and Si where i 1,2,3... Use of partial wave analysis will be made to investigate several relevant cases which infer the nature of the resonances. Acoustic scattering, shallow water, waveguide propagation.
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