Comparison between the Tap Model and Sara-2d Results.
NAVAL RESEARCH LAB WASHINGTON DC PHYSICAL ACOUSTICS BRANCH
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The Technical Advisory Panel TAP has developed a simple model for the bistatic response of a submarine consisting of four scattering mechanisms the backscattering response from a finite cylinder, forward scattering from a finite cylinder, scattering from hemispherical end-caps and scattering of elastic waves in the cylinder. Scattering results using the TAP model are compared to computations made using finite elementsinfinite elements method for a finite cylindrical shell with hemispherical end-caps for two different cases. In the first case the cylinder does not contain ribs. In the second case the cylinder contains eighty-five ribs with equal spacing between any two adjacent ribs. Comparisons show that major scattering features such as a strong specular reflection or the strong forward scattering field look similar using the two approaches but differences can be observed between the two results. The TAP model predicts a lower forward scattered field at some angles, specially near end incidence.
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