An Improved BASIS Model for the BeTSSi Submarine

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Authors
  1. Nell, C.W.
  2. Gilroy, L.E.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
DRDC Atlantic and the US Naval Research Laboratory have developed a tool for Operations Research which will predict the low frequency acoustic target strength of a rigid submarine hull. The BASIS (Bistatic Acoustic Simple Integrated Structure) software uses analytical methods to combine the results from simple geometric shapes to approximate the response of the submarine hull. A BASIS target strength simulation model was developed for the Benchmark Target Strength Simulation Submarine (BeTSSi-Sub) and compared with reference data at 200 Hz, 1 kHz, 4kHz, and 8 kHz, to support an international workshop on target strength simulation methods. In general, it was found to outperform the generic model previously employed. However, there were three major discrepancies: at bow aspect angles and at higher frequencies, BASIS predicted significantly higher target strength than reference; between beam and stern aspects and especially at 1 kHz, a rise in target strength was present in the BASIS predictions but not reference; and at aspect angles normal to the rear of the sail and tailfins, BASIS target strength peaked higher and more sharply at high frequencies than reference. The source of all three of these discrepancies is likely inaccurate modeling of the sloped sail and tailfin; the first two discrepancies were resolved quite well by removing the front side and back side of the sail and tailfin respectively (BASIS assumes these components are true vertical), with the undesirable side

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Keywords
Target strength;BeTSSi-Sub (Benchmark Target Strength Simulation Submarine);BASIS (Bistatic Acoustic Simple Integrated Structure);Physical optics;Helmholtz-Kirchhoff theory
Report Number
DRDC-ATLANTIC-TR-2003-199 — Technical Report
Date of publication
01 Nov 2003
Number of Pages
25
DSTKIM No
CA023481
CANDIS No
520811
Format(s):
Hardcopy;CD ROM

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