Aircraft noise has become a major concern for communities around airports giving rise to stacked legislations and regulations at various levels. Current noise reduction technologies do not seem to achieve the targeted reductions set by the EC experts by the ACARE Flightpath 2050. Classical control methods can provide significant noise reduction but may add additional mass causing excess drag and degradation of the aircraft aerodynamic performance. The general goal of this proposal is to create meta-structures able to efficiently dissipate flow-induced noise without requiring increasing area or added weight. We have proposed a novel type of high performance acoustic treatment made up of Micro-Capillary Plate (MCP) absorbers. MCPs consist of highly porous panels made up of leaded glass, of high porosity (greater than 60%) since their surface contains millions of micro-channels per centimeter square, the holes or square channel dimensions varying between 5µm and 50µm. These characteristics provide them with exceptional acoustical properties compared to other classical absorbers or MPPs. For instance, if rigidly backed by an air cavity of 24 mm, a MCP device provides a half-bandwidth absorption over 12 octaves whereas a MPP device works only over two-three octaves. The project outcomes allow practical selection of the meta-material architecture that best suits specific applications. For instance, they can be used for duct geometries in air-conditioning and ventilations systems.
Publicaciones
GAA | Cost-efficient characterization of the aeroacoustic performance of micro-perforated wall-treatments in a wind tunnelCedric Maury, Teresa Bravo, Daniel Mazzoni, Muriel Amielh and Laurence PietriProc. Mtgs. Acoust. 42, 040001 (2020)https://doi.org/10.1121/2.0001378 |
GAA | Assessing the broadband absorption properties of micro-capillary plates through modelling and experimental studiesTeresa Bravo and Cedric MauryProc. Mtgs. Acoust. 42, 040002 (2020)https://doi.org/10.1121/2.0001380 |
GAA | Absorption and Transmission of Boundary Layer Noise through Micro-Perforated Structures: Measurements and ModellingsCédric Maury, Teresa Bravo & Daniel Mazzoni Flinovia—Flow Induced Noise and Vibration Issues and Aspects-III. FLINOVIA 2019. Springer, Chamhttps://doi.org/10.1007/978-3-030-64807-7_11 |
Congresos y reuniones, conferencias
GAA | Sound absorption through micro-capillary plates: modelling and experimental studiesConferencia invitada T. Bravo and C. Maury 24th Internationa Congress on Acoustics Del 24 al 28 de octubre de 2022, Gyeongju, Corea del Sur. |
GAA | Causal-based acoustic optimization of microperforated structures with rigid backingConferencia invitada T. Bravo and C. Maury Internoise 2022 August 2022, Glasgow, UK. |
GAA | Low-frequency broadband dissipation using Micro-Capillary PlatesConferencia invitada T. Bravo and C. Maury Symposium on the Acoustics of Poro-Elastic Materials, SAPEM 2020+I E-congress celebrado del 29 de marzo al 2 de abril de 2021. |
GAA | Investigation of Micro-Capillary Plates to Enhance Low-Frequency Sound AbsorptionConferencia invitada C. Maury and T. Bravo FORUM ACUSTICUM 2020, FA2020/35, E-congress celebrado del 7 al 11 de diciembre de 2020, Lyon, Francia. |
GAA | The Effect of a Micro-Perforated Cavity Floor on the Propagation of Tunnel-Cavity Modes in a Low-Speed Duct FlowConferencia invitada C. Maury, T. Bravo and D. Mazzoni FORUM ACUSTICUM 2020, FA2020/35, E-congress celebrado del 7 al 11 de diciembre de 2020, Lyon, Francia. |
GAA | Micro-capillary plate absorbers for broadband dissipation in the low frequency rangeConferencia invitada T. Bravo and C. Maury Internoise 2020. E-congress celebrado del 23 al 26 de agosto de 2020, Seúl, Corea. |
GAA | Optimised micro-perforated panels for broadband absorptivityConferencia invitada T. Bravo and C. Maury 26th International Congress on Sound and Vibration Del 7 al 11 de julio de 2019, Montreal, Canada. |
GAA | The Attenuation of Flow-Induced Cavity Noise in a Wind-Tunnel by Micro-PerforationsConferencia invitada C. Maury, T. Bravo and D. Mazzoni The 48th International Congress and Exhibition on Noise Control Engineering. INTERNOISE 2019. Del 16 al 19 de junio de 2019, Madrid, España. |
GAA | Absorption and Transmission through Functionally-Graded Micro Perforated PanelsConferencia invitada T. Bravo, C. de la Colina and C. Maury The 48th International Congress and Exhibition on Noise Control Engineering. INTERNOISE 2019. Del 16 al 19 de junio de 2019, Madrid, España. |
GAA | Sound Attenuation in a Flow Duct Periodically Loaded with Micro-Perforates Backed by Helmholtz ResonatorsConferencia invitada T. Bravo and C. Maury The 47th International Congress and Exhibition on Noise Control Engineering. INTERNOISE 2018. Del 26 al 29 de agosto de 2018, Chicago, Illinois, EE.UU. |