HYDROACOUSTICS
ANNUAL JOURNAL
START NEW VOL 20 SEARCH STATISTICS PAS - GDANSK DIVISION

Numerical methods in underwater acoustics - sound propagation and backscattering

pp. 127-140, vol. 18, 2015

Bodo Nolte
Embassy of the Federal Republic of Germany in Poland, Warsaw, Germany
Bundeswehr Technical Centre for Ships and Naval Weapons, Maritime Technology and Research, Eckernförde, Germany

Jan Ehrlich
Bundeswehr Technical Centre for Ships and Naval Weapons, Maritime Technology and Research, Eckernförde, Germany

Hans-Günter Hofmann
Bundeswehr Technical Centre for Ships and Naval Weapons, Maritime Technology and Research, Eckernförde, Germany

Ingo Schäfer
Bundeswehr Technical Centre for Ships and Naval Weapons, Maritime Technology and Research, Eckernförde, Germany

Alexandra Schäfke
Bundeswehr Technical Centre for Ships and Naval Weapons, Maritime Technology and Research, Eckernförde, Germany

Arne Stoltenberg
Bundeswehr Technical Centre for Ships and Naval Weapons, Maritime Technology and Research, Eckernförde, Germany

Ralf Burgschweiger
Beuth University for Applied Sciences, Berlin, Germany

Key words: stochastic ray tracing; the German Navy

Abstract: This report summarizes an overview given at the XXXII Symposium on Hydroacoustics (SHA 2015) over several modeling techniques that are used in the context of military applications at the Research Department FWG of the German Bundeswehr Technical Centre for Ships and Naval Weapons, Maritime Technology and Research (WTD 71). For the modeling and understanding of sound propagation, a physical model consisting of a tank for the scaled measurements and the corresponding numerical simulation is presented. The basic formalism of the stochastic ray tracing of the German Navy sonar simulation MOCASSIN is explained and compared to traditional deterministic ray tracing, and this includes comparisons with measurements. Strategies for the approximate calculation of the sonar target strength of large underwater objects with the use of boundary element methods, fast multipole methods as well as a ray-based algorithm, are all presented here and the results of the calculations of several test objects are shown.

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© Polish Acoustical Society - Gdansk Department, Polish Academy of Sciences. This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported. (CC BY-NC-SA 3.0)