Abstract
Backscattering of monochromatic plane sound waves from a soft cylinder of finite length reinforced with N rigid ribs are considered. The Kirchhoff and the Keller approximations are used in various different combinations to produce plots of the target strength (TS) versus incidence angle for purposes of comparison. The angular scattering patterns which result from the combination of methods considered here, agree fairly well away from the broadside incidence where the strongest differences appear. It is felt that some of the predictions of these combinations of methods represent good estimates for the numerical solution corresponding to an elastic cylindrical shell with flat ends and N internal ribs. This paper derives all the formulas used and compares the predictions they yield in various graphs.
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