Comparison of three-dimensional and axisymmetric software for predicting acoustic target strength

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Authors
  1. Gilroy, L.E.
  2. Fawcett, J.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Recent work at the Defence Research Establishment Atlantic (DREA) has led to the development of software for predicting the target strength of underwater objects. This capability is incorporated into the general acoustic radiation prediction software tool, AVAST. While AVAST has been successfully validated against a limited set of theoretical dta, it has not been fully validated agsint experimental data or other numerical codes. In this report, AVAST predictions are compared to those made by an axisymmetric-base code (ASBIEM) developed at SACLANT-CEN for small cylinders with either flat or hemispherical endcaps. The results were compared at three frequencies for the full monostatic case and the bistatic case (with three different source locations). For the bistatic case, there was generally good agreement between AVAST, ASBIEM, and theoretical results for the specific source locations selected. The results from the cylinder with hemispherical end-caps showed slightly better agreement than those from the flat end cylinder. For the monostatic analyses, the AVAST and ASBIEM codes showed very good agreement at the lower frequencies for both cylinder models. TRUNCATED

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Keywords
Computer programs (AVAST);Computer programs (ASBIEM);Bistatic sonar;Monostatic sonar;Boundary element
Report Number
DREA-TM-2001-018 — Technical Memorandum
Date of publication
01 Nov 2001
Number of Pages
37
DSTKIM No
CA020090
CANDIS No
516761
Format(s):
Hardcopy;Document Image stored on Optical Disk

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