Enhancing the absorption properties of acoustic porous plates by periodically embedding Helmholtz resonators
| العنوان: | Enhancing the absorption properties of acoustic porous plates by periodically embedding Helmholtz resonators |
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| المؤلفون: | B. Brouard, Jean-Philippe Groby, Olivier Dazel, Benoit Nennig, C. Lagarrigue, Vincent Tournat |
| المساهمون: | Laboratoire d'Acoustique de l'Université du Mans (LAUM), Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM), Laboratoire QUARTZ (QUARTZ ), Université Paris 8 Vincennes-Saint-Denis (UP8)-SUPMECA - Institut supérieur de mécanique de Paris-Ecole Nationale Supérieure de l'Electronique et de ses Applications (ENSEA)-Ecole Internationale des Sciences du Traitement de l'Information (EISTI), Laboratoire d'Ingénierie des Systèmes Mécaniques et des MAtériaux (LISMMA), Université Paris 8 Vincennes-Saint-Denis (UP8)-SUPMECA - Institut supérieur de mécanique de Paris (SUPMECA) |
| المصدر: | Journal of the Acoustical Society of America Journal of the Acoustical Society of America, Acoustical Society of America, 2015, 137 (6), pp.273-280. ⟨10.1121/1.4904534⟩ |
| بيانات النشر: | HAL CCSD, 2015. |
| سنة النشر: | 2015 |
| مصطلحات موضوعية: | Materials science, Acoustics and Ultrasonics, Helmholtz resonator, Porous media, Optical metamaterials, Telecommunications engineering, law.invention, Resonator, symbols.namesake, Optics, Arts and Humanities (miscellaneous), law, Velocity gradient tensor, Organic compounds, Ultrasonics, Absorption (electromagnetic radiation), ComputingMilieux_MISCELLANEOUS, business.industry, Optical absorption, Acoustics, [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph], Wavelength, Attenuation coefficient, Helmholtz free energy, symbols, Flow rate measurement, Porous medium, business, Acoustic resonance |
| الوصف: | International audience; This paper studies the acoustical properties of hard-backed porous layers with periodically embedded air filled Helmholtz resonators. It is demonstrated that some enhancements in the acoustic absorption coefficient can be achieved in the viscous and inertial regimes at wavelengths much larger than the layer thickness. This enhancement is attributed to the excitation of two specific modes: Helmholtz resonance in the viscous regime and a trapped mode in the inertial regime. The enhancement in the absorption that is attributed to the Helmholtz resonance can be further improved when a small amount of porous material is removed from the resonator necks. In this way the frequency range in which these porous materials exhibit high values of the absorption coefficient can be extended by using Helmholtz resonators with a range of carefully tuned neck lengths. |
| اللغة: | English |
| تدمد: | 0001-4966 1520-8524 |
| DOI: | 10.1121/1.4904534⟩ |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1c3a905f866f86bd68e429558084aa45 https://hal.archives-ouvertes.fr/hal-01179024 |
| رقم الانضمام: | edsair.doi.dedup.....1c3a905f866f86bd68e429558084aa45 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 00014966 15208524 |
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| DOI: | 10.1121/1.4904534⟩ |