2023_programme: High-performance calculation of the acoustic backscattering strength based on the Kirchhoff high-frequency approximation

• Session: 14. Target Echo Strength – Measurements and Modelling
  Organiser(s): David Nunn
• Lecture: High-performance calculation of the acoustic backscattering strength based on the Kirchhoff high-frequency approximation
  Paper ID: 1870
  Author(s): Burgschweiger Ralf, Schäfer Ingo, Sachau Delf, Ehrlich Jan
  Presenter: Burgschweiger Ralf
  Abstract: The acoustic backscatter strength (target echo strength, TES) of underwater objects, which is important for sonar applications, can be determined by different numerical methods (boundary element method, finite element method, ray tracing and approximate methods).\nThese are capable of taking into account both the hull and, to some extent, the internal structures of the object under consideration, although the computational effort required increases significantly with higher complexity.\nIn order to make a fast prediction for the radiation behavior of mostly concave objects, e.g., the outer hull of a submarine, the Kirchhoff high-frequency approximation (KIA) method has been widely used since the middle of the last century, which uses optical analogies and is primarily suitable for high frequencies.\nThe extension of the instruction sets of current CPUs allows the parallel execution of floating point operations (Advanced Vector Extensions) with 8 or 16 real numbers within one machine instruction.\nIn the context of the research project "Computational Acoustics", an existing conventional code was optimized accordingly using the AVX2 variant.\nIn this presentation, the fundamentals, results, and computation times for a very fast variant of the Kirchhoff high-frequency approximation (KIA) are presented and compared with results of other methods.
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• Corresponding author: Dr Ralf Burgschweiger
  Affiliation: Helmut-Schmidt-University (Uni/Bw-H), Hamburg
  Country: Germany
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