Low frequency noise sources are increasingly present in guided flows, particularly in aeronautics where new engine architectures are driven by the reduction of energy consumption. Current acoustic treatments present a conflict between achieving both high acoustic and aerodynamic performance while respecting the constraints of reduced lined surface, low thickness and low embarked weight. This problematic is also present in automotive transports for the aero-acoustic optimisation of exhaust silencers, in heat and ventilation systems in buildings for low-frequency noise reduction with minimal air pressure losses and in wind-turbines. Emergence of acoustic metamaterials (AM) allowed the development of compact sub-wavelength absorbers that can provide solutions in terms of the required wideband low-frequency sound dissipation. AMs derive their unconventional properties from their anisotropic cellular architecture that can be translated into unusual effective density and bulk modulus parameters. However, despite the tremendous growth of AM studies during the last decade, the potential of AMs in presence of a low-speed flow has still not yet been fully explored. Previous results from the applicants have shown that even though the AM produce high noise attenuation in the no-flow case, their aeroacoustic performance are highly sensitive to interactions between the flow and the AM interface. For a micro-perforated interface, it was found that extra-noise generation may appear due to efficient back-scattering of the turbulent energy into sound. Moreover, the presence of flow in direct contact with a flush-mounted porous surface generates drag, flow-induced noise and aeroacoustic instabilities, as observed for micro-perforated liners or interferential helicoid metamaterials. To overcome these difficulties, the AEROSMEET project addresses two challenges. First, it aims at developing new generations of AM-flow compliant interfaces, with micro-grooved and micro-channelled structures, able to achieve low frictional losses in presence of a sheared or turbulent flow, but without hindering the metasilencer acoustic performance. Moreover, augmented metasilencers will be designed to achieve full broadband noise reduction down to low frequencies both in reflection and transmission in presence of a low-speed sheared flow, thereby achieving an Aeroacoustic Black Hole (ABH) effect. The AEROSMEET outcomes will contribute to the national strategic actions on Climate, Energy and Mobility 2021-23. Indeed, the newly designed metasilencers will comply with energy-saving requirements in contrast to other silencing solutions prone to high fluid pressure discharge that should be compensated by more powerful flow turbines. They will also provide solutions to the challenging tasks of lowering low-frequency noise emissions in aeronautical and surface transports as well as improving the combustion efficiency of hydrogen engines through the ABH effect.
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Publicaciones
Converging rainbow trapping silencers for broadband sound dissipation in a low-speed ducted flowT. Bravo and C. Maury Journal of Sound and Vibration, 589, 118524 (2024)https://doi.org/10.1016/j.jsv.2024.118524 | GAA |
Acoustic Pressure Amplification through In-Duct Sonic Black Holes C. Maury, T. Bravo, M. Amielh and D. MazzoniApplied Sciences 14(11), 4699 (2024)https://doi.org/10.3390/app14114699 | GAA |
Modelling and characterization of micro-porous resonating liners under a low speed flowCédric Maury, Teresa Bravo and Daniel MazzoniCapítulo en Flinovia—Flow Induced Noise and Vibration Issues and Aspects—IV (2024 ed.) Edited by Danielle Moreau,Con Doolan,Angus Wills. Springer International Publishing AGISBN-10 : 3031739345, ISBN-13 : 978-3031739347 | GAA |
Congresos y reuniones, conferencias
Influence of a low-speed flow on the acoustic performance of rainbow-trapping mufflersConferencia invitada Cedric Maury, Teresa Bravo, Daniel Mazzoni, Muriel Amielh |
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Noise attenuation and aerosol agglomeration by rib-designed silencers under a low-speed particle-laden flow Conferencia invitada Teresa Bravo, Cedric Maury, Muriel Amielh, Daniel Mazzoni 54rd International Congress & Exposition on Noise Control Engineering: Internoise 2025 Del 24 al 27 de septiembre de 2025, Sao Paulo, Brazil |
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Multi-functional rainbow trapping filters for particle acoustic agglomerationConferencia invitada Teresa Bravo, Cedric Maury, Muriel Amielh, Daniel Mazzoni |
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Low-drag rainbow-trapping filters for broadband sound dissipation in a low-speed ducted flowConferencia invitada Cedric Maury, Teresa Bravo, Fawad Ali, Daniel Mazzoni, Muriel Amielh |
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Effects of Volumetric Modes on the Optimization of Micro-Perforated Multi-Layer Absorber PanelsConferencia invitada Cedric Maury, Teresa Bravo, Daniel Mazzoni, Muriel Amielh |
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Silenciadores para sistemas de ventilación basados en agujeros negros acústicosConferencia invitada Teresa Bravo and Cedric Maury Internoise 2025 (https://www.fia2024.cl/) Del 2 al 4 de diciembre de 2024, Santiago de Chile, Chile. |
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ANALYTICAL PREDICTION AND IN-SITU EXPERIMENTAL CHARACTERIZATION OF ANISOTROPIC FIBROUS MATERIALSConferencia invitada Teresa Bravo, Cedric Maury, Daniel Mazzoni, Muriel Amielh XIII Congresso Ibérico de Acústica, 55.º Congreso Español de Acústica. TECNIACÚSTICA 2024 Del 11 al 13 de septiembre de 2024, Faro, Portugal. Puede descargar la comunicación presentada haciendo clic aquí (277.1 KB) |
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BROADBAND PERFORMANCE OF MICRO-PERFORATED ACOUSTIC BLACK HOLES IN DUCTSConferencia invitada Teresa Bravo, Cedric Maury, Daniel Mazzoni, Muriel Amielh, Fawad Ali XIII Congresso Ibérico de Acústica, 55.º Congreso Español de Acústica. TECNIACÚSTICA 2024 Del 11 al 13 de septiembre de 2024, Faro, Portugal. Puede descargar el artículo haciendo clic aquí (193.52 KB) |
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Elasticity and modal effects on the optimal performance of micro-perforated multi-layered absorbersConferencia invitada Cédric Maury, Teresa Bravo Exposition on Noise Control Engineering Del 25 al 29 de agosto de 2024, Nantes, Francia. Puede descargar la comunicación presentada haciendo clic aquí (2.34 MB) |
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Acoustic Black Hole silencers for broadband dissipation in ducted geometriesConferencia invitada Teresa Bravo, Cedric Maury, Daniel Mazzoni, Muriel Amielh Exposition on Noise Control Engineering Del 25 al 29 de agosto de 2024, Nantes, Francia. Puede descargar la comunicación presentada haciendo clic aquí (825.41 KB) |
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THE INFLUENCE OF VIBRATIONS ON THE OPTIMAL PERFORMANCE OF MICRO-PERFORATED ACOUSTIC METAMATERIALSConferencia invitada Cédric Maury, Teresa Bravo 30thInternational Congress on Sound and Vibration. ICSV'30 Del 8 al 11 de julio de 2024, Amsterdam, Países Bajos Puede descargar la comunicación presentada haciendo clic aquí (1.22 MB) |
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ATTENUATION OF LOW FREQUENCIES FOR DUCTED SYSTEMS BASED ON THE ACOUSTIC BLACK HOLE TECHNIQUEConferencia invitada Teresa Bravo, Cedric Maury, Daniel Mazzoni, Muriel Amielh 30thInternational Congress on Sound and Vibration. ICSV'30 Del 8 al 11 de julio de 2024, Amsterdam, Países Bajos Puede descargar la comunicación presentada haciendo clic aquí (1.13 MB) |
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