Optimization of quasi-periodically ribbed structures to improve stealth and discreteness of underwater vehicles

Autor: Bertrand Dubus, Charles Croënne, Samuel Deleplanque, Anne-Christine Hladky-Hennion
Přispěvatelé: Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Acoustique - IEMN (ACOUSTIQUE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Acoustique - IEMN
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Journal of the Acoustical Society of America
178th Meeting of the Acoustical Society of America
178th Meeting of the Acoustical Society of America, Dec 2019, San Diego, CA, United States. paper 2aPA3, 2828-2828, ⟨10.1121/1.5136797⟩
ISSN: 0001-4966
1520-8524
Popis: Conference invitée du 178th Meeting of the Acoustical Society of America, San Diego, CA, USA, december 2-6, 2019; International audience; Acoustic stealth and discreteness of underwater vehicles are important issues in underwater acoustics. These vehicles are constituted of shells which are periodically reinforced by ribs. Acoustic fields radiated or scattered by such structures are strongly affected by phenomena related to this periodicity such as Bragg diffraction and Bloch-Floquet waves. The introduction of a slight modification of each rib is considered here to reduce this signature for radiation problem, scattering problem or both radiation and scattering problems. Geometrical and material parameter variations used to obtain these new solutions may also be constrained by technological limitations. In a classical process, the design would be realized by experts using tools and methodologies that have been developed over the years. Another approach of the problem consists in using optimization algorithms (genetic, greedy, etc.) which have to be coupled to simulation models of the acoustic radiation and scattering problems. This approach is considered here in the case of a plate periodically reinforced by ribs. Simulation results are reported and the impact of the choice of the objective function, the parameter to be varied, the simulation model and the optimization algorithm on the final performance are also discussed.
Databáze: OpenAIRE
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