Accession Number : ADA329259

Title :   Comparison between the Tap Model and Sara-2d Results.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC PHYSICAL ACOUSTICS BRANCH

Personal Author(s) : Sarkissian, Angie

PDF Url : ADA329259

Report Date : 12 SEP 1997

Pagination or Media Count : 13

Abstract : 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 elements/infinite 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.

Descriptors :   *ACOUSTIC SCATTERING, *TARGET STRENGTH, ACOUSTIC WAVES, FINITE ELEMENT ANALYSIS, BACKSCATTERING, SUBMARINES, ACOUSTIC FIELDS, BISTATIC DETECTION, SPECULAR REFLECTION, FORWARD SCATTERING.

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE