High-performance calculation of the acoustic backscattering strength based on the Kirchhoff high-frequency approximation
Publication date
2023
Document type
Konferenzbeitrag
Author
Organisational unit
Conference
7th Underwater Acoustics Conference and Exhibition, UACE2023 ; Kalamata, Greece ; June 25–30, 2023
Book title
7th Underwater Acoustics Conference and Exhibition, UACE2023 : Conference proceedings
First page
303
Last page
310
Part of the university bibliography
✅
Keyword
Kirchhoff approximation
Target echo strength
High performance calculation
Advanced vector extensions
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). These are capable of considering 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. In 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. The 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. In the context of the research project "Computational Acoustics", an existing conventional code was optimized accordingly using the AVX2 variant. In 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.
Version
Published version
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