Broadband monostatic acoustic scattering simulations of underwater unexploded ordnance using time-domain spectral-elements
| Autor: | W. A. Kuperman, Sandrine T. Rakotonarivo, Earl G. Williams, Alexis Bottero |
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| Přispěvatelé: | Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2019 |
| Předmět: |
business.product_category
Acoustics and Ultrasonics Computer simulation Scattering Computer science Acoustics Finite element method [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph] Unexploded ordnance Arts and Humanities (miscellaneous) Rocket Time domain Underwater business Underwater acoustics ComputingMilieux_MISCELLANEOUS Parametric statistics |
| Zdroj: | 178th Meeting of the Acoustical Society of America 178th Meeting of the Acoustical Society of America, 2019, San Diego, United States. pp.3005-3005, ⟨10.1121/1.5137405⟩ |
| ISSN: | 0001-4966 |
| DOI: | 10.1121/1.5137405 |
| Popis: | Acoustic detection of unexploded ordnance (UXO) that contaminate the world’s waterways is vital. Critical to the implementation of detection methods is the numerical simulation of the scattering response of these targets using finite element methods. We introduce a parametric approach based on the time-domain spectral finite element method (SEM). This technique allows for the computation of broadband acoustic response of complex heterogeneous 3-D fluid-solid objects, in particular a 5 inch rocket UXO used for this study. The scattered field is obtained at arbitrary distances using the Kirchhoff–Helmholtz integral. The main interest of the SEM is that it is particularly adapted to high-performance computing (CPU or GPU). Contrary to most of the other finite element methods it scales perfectly; using twice as many processors leads to a halving of computing time. In addition, working in the time domain is a direct simulation of common sonars and experiments. The method is first benchmarked against the commercial finite-element code COMSOL on the monostatic response of a rigid target over a full 180 deg. Finally, results obtained for the 5 inch rocket are compared to actual measurements obtained in the NRL underwater acoustics tank facility. [Work partially supported by the Office of Naval Research.] |
| Databáze: | OpenAIRE |
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