Numerical methods in underwater acoustics - sound propagation and backscattering

• Autorzy: Nolte B. , Ehrlich J. , Hofmann H.-G. , Schäfer I. , Schäfke A. , Stoltenberg A. , Burgschweiger R.
• Języki publikacji: EN

Abstrakty

EN

This report summarizes an overview given at the XXXII Symposium on Hydroacoustics (SHA 2015) over several modelling 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 modelling and understanding of sound propagation a physical model consisting of a tank for scaled measurements and the corresponding numerical simulation is presented. The basic formalism of stochastic ray tracing of the German Navy sonar simulation MOCASSIN is explained and compared to traditional deterministic ray tracing including the comparison 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 and a ray-based algorithm are presented and the results of the calculations of several test objects are shown.

Słowa kluczowe

EN

stochastic ray tracing; German Navy

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 2015
• Tom: Vol. 18
• Strony: 127--140
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Nolte B.

• Embassy of the Federal Republic of Germany in Poland, Jazdów 12, 00-467 Warsaw
• Bundeswehr Technical Centre for Ships and Naval Weapons, Maritime Technology and Research, Berliner Straße 115, 24340 Eckernförde, Germany

autor

Ehrlich J.

• Bundeswehr Technical Centre for Ships and Naval Weapons, Maritime Technology and Research, Berliner Straße 115, 24340 Eckernförde, Germany

autor

Hofmann H.-G.

• Bundeswehr Technical Centre for Ships and Naval Weapons, Maritime Technology and Research, Berliner Straße 115, 24340 Eckernförde, Germany

autor

Schäfer I.

• Bundeswehr Technical Centre for Ships and Naval Weapons, Maritime Technology and Research, Berliner Straße 115, 24340 Eckernförde, Germany

autor

Schäfke A.

• Bundeswehr Technical Centre for Ships and Naval Weapons, Maritime Technology and Research, Berliner Straße 115, 24340 Eckernförde, Germany

autor

Stoltenberg A.

• Bundeswehr Technical Centre for Ships and Naval Weapons, Maritime Technology and Research, Berliner Straße 115, 24340 Eckernförde, Germany

autor

Burgschweiger R.

• Beuth University for Applied Sciences, Luxemburger Straße 10, 13353 Berlin

Bibliografia

• [1] H.G. Schneider, Rough boundary scattering in raytracing computations, Acoustica 35, p. 18, 1976.
• [2] H.G. Schneider, Excess sound propagation loss in a stochastic environment, J. Acoust. Soc. Am., Vol. 62, 871-877, 1977.
• [3] J. Sellschopp, Stochastic raytracing in thermoclines, In Ocean Variability and Acoustic Propagation, Potter and Warn-Varnas (ed.), Kluwer, 1991.
• [4] R. Thiele, A comparative test of shallow water sound propagation models against real data, SACLANTCEN Report SR 149, La Spezia, Italy, 1989.
• [5] F. Gerdes, H.G. Hofmann, I. Nissen, Comparison of measured and modelled acoustic propagation loss in the Baltic Sea, In Seventh European Conference on Underwater Acoustics, D.G. Simmons, pp 51-56, 2004.
• [6] H.G. Hofmann, D. Brecht, F. Gerdes, Propagation loss modelling and measurements under conditions with high spatial variability, In UDT Europe, Naples, Italy, 2007.
• [7] F. Gerdes, H.G. Hofmann, W. Jans, S. Künzel, I. Nissen, H. Dol, Measurements and simulations of acoustic propagation loss in the Baltic Sea, Proc. Underwater Acoustic Measurements: Technologies & Results, Papadakis (ed.), Greece, 2009.
• [8] R. Burgschweiger, I. Schäfer, M. Ochmann, B. Nolte, BEAM: A ray-tracing based solver for the approximate determination of acoustic backscattering of thin-walled objects - Basics and Implementation, Proceedings of Forum Acusticum, Krakow, Poland, 2014.
• [9] B. Nolte, I. Schäfer, C. de Jong, L. Gilroy, BeTSSi II Benchmark on Target Strength Simulation, Proceedings of Forum Acusticum, Krakow, Poland, 2014.
• [10] R. Burgschweiger, I. Schäfer, M. Ochmann, B. Nolte, Results of the ray-tracing based solver BEAM for the approximate determination of acoustic backscattering from thinwalled objects, Proceedings of the Inter-noise, Melbourne, Australia, 2014.