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Browsing by Author "Groby, Jean-Philippe"

Now showing items 1-19 of 19

Aerogel-based metasurfaces for perfect acoustic energy absorption

Fernandez-Marin, Antonio A.; Jimenez, Noe; Groby, Jean-Philippe; Sánchez-Dehesa Moreno-Cid, José; Romero García, Vicente (American Institute of Physics, 2019-08-05)

[EN] The unusual viscoelastic properties of silica aerogel plates are efficiently used to design subwavelength perfect sound absorbers. We theoretically, numerically and experimentally report a perfect absorbing metamaterial ...
Compact resonant systems for perfect and broadband sound absorption in wide waveguides in transmission problems

Boulvert, Jean; Gabard, Gwenael; Romero-García, Vicente; Groby, Jean-Philippe (Nature Publishing Group, 2022-06-15)

[EN] This work deals with wave absorption in reciprocal asymmetric scattering problem by addressing the acoustic problem of compact absorbers for perfect unidirectional absorption, flush mounted to the walls of wide ducts. ...
Complex Dispersion Relation Recovery from 2D Periodic Resonant Systems of Finite Size

Cebrecos, Alejandro; Romero-García, Vicente; Groby, Jean Philippe (MDPI AG, 2019-02-01)

[EN] The complex dispersion relations along the main symmetry directions of two-dimensional finite size periodic arrangements of resonant or non-resonant scatterers are recovered by using an extension of the SLaTCoW (Spatial ...
Control of bending wave reflection at beam terminations by thermally tunable subwavelength resonators

Raybaud, Guillaume; Ouisse, Morvan; Leng, Julien; Pelat, Adrien; Groby, Jean Philippe; Romero-García, Vicente; Picó Vila, Rubén; Gautier, François (Elsevier, 2022-07-21)

[EN] The perfect absorption of bending waves by thermally tunable subwavelength absorbers is analytically and experimentally demonstrated in this work for a reflection problem in beams. These absorbers are local resonators ...
Emerging topics in nanophononics and elastic, acoustic, and mechanical metamaterials: an overview

Krushynska, Anastasiia O.; Torrent, Daniel; Aragón, Alejandro M.; Ardito, Raffaele; Bilal, Osama R.; Bonello, Bernard; Bosia, Federico; Chen, Yi; Christensen, Johan; Colombi, Andrea; Cummer, Steven A.; Djafari-Rouhani, Bahram; Fraternali, Fernando; Galich, Pavel I.; García, Pedro David; Groby, Jean-Philippe; Jimenez, Noe; Picó Vila, Rubén (Walter de Gruyter GmbH, 2023-02-23)

[EN] This broad review summarizes recent advances and "hot " research topics in nanophononics and elastic, acoustic, and mechanical metamaterials based on results presented by the authors at the EUROMECH 610 Colloquium ...
Experimental characterization of rigid-scatterer hyperuniform distributions for audible acoustics

Chéron, Élie; Groby, Jean Philippe; Pagneux, Vincent; Félix, Simon; Romero-García, Vicente (AMERICAN PHYSICAL SOCIETY, 2022-08-16)

[EN] The wave transport properties of two-dimensional stealthy hyperuniform distributions of rigid scatterers embedded in a waveguide are experimentally characterized for scalar waves in airborne audible acoustics. The ...
Explicit Modeling and Optimization of Acoustic Metalenses for Baffled Sources

Cavalieri, Théo; Romero-García, Vicente; Melon, Manuel; Groby, Jean-Philippe; Chamard, Jean-Christophe (American Physical Society, 2023-08-04)

[EN] The steering and the focusing of acoustic beams are of increasing interest for personalized-sound-zone applications. Sound zones require the generation of a strong contrast in sound pressure level between different ...
Fundamental constraints on broadband passive acoustic treatments in unidimensional scattering problems

Meng, Yang; Romero-García, Vicente; Gabard, Gwénaël; Groby, Jean-Philippe; Bricault, Charlie; Goudé, Sébastien; Sheng, Ping (The Royal Society, 2022-09-28)

[EN] In a passive lossy acoustical system, sum rules derived from passivity explicitly relate the broadband response to the spatial dimension of the system, which provide important design criteria as well. In this work, ...
Iridescent Perfect Absorption in Critically-Coupled Acoustic Metamaterials Using the Transfer Matrix Method

Jimenez, Noe; Groby, Jean-Philippe; Pagneux, Vincent; Romero García, Vicente (MDPI AG, 2017)

[EN] The absorption performance of a locally-reacting acoustic metamaterial under oblique incidence is studied. The metamaterial is composed of a slotted panel, each slit being loaded by an array of Helmholtz resonators. ...
Non-locality of the Willis coupling in laminates

Malléjac, Matthieu; Cavalieri, Théo; Romero-García, Vicente; Merkel, Aurélien; Torrent, Daniel; Christensen, Johan; Li, Jensen; Groby, Jean-Philippe (Elsevier, 2022-03)

[EN] The closed form expressions of the effective properties in periodic fluid laminates are derived thanks to the Pade approximation of the transfer matrix. A second-order Taylor expansion of the transfer matrix elements ...
On the monopolar and dipolar acoustic responses of a passive single point scatterer subjected to low-Mach-number grazing air flow

Meng, Yang; Humbert, Thomas; Romero-García, Vicente; Groby, Jean Philippe; Gabard, Gwénaël (Elsevier, 2024-05-26)

[EN] The acoustic response of a passive single point scatterer under grazing flow is shown theoretically and experimentally to have both monopolar and dipolar contributions. The monopolar response is dominated by the ...
Perfect acoustic absorption in deep sub-wavelength structures for the ventilation problems with degenerate resonators

Romero García, Vicente; Jimenez, Noe; Richoux, Olivier; Theocharis, Georgios; Groby, Jean-Philippe; Pagneux, Vincent (German Acoustical Society, 2019-09-13)

[EN] In this work we report a mechanisms providing symmetric perfect acoustic absorption by sub-wavelength structures in the ventilation problem. While in the problem of reflection the mechanism consists in critically ...
Perfect, broadband, and sub-wavelength absorption with asymmetric absorbers: Realization for duct acoustics with 3D printed porous resonators

Boulvert, Jean; Humbert, Thomas; Romero-García, Vicente; Gabard, Gwenael; Fotsing, Edith Roland; Ross, Annie; Mardjono, Jacky; Groby, Jean Philippe (Elsevier, 2022-04-14)

[EN] This article explores, theoretically and experimentally, asymmetric absorbers made of detuned and folded quarter wavelength resonators filled with air or porous materials. When used as acoustic lining in ducts, their ...
Scattering Evaluation of Equivalent Surface Impedances of Acoustic Metamaterials in Large FDTD Volumes Using RLC Circuit Modelling

Ballestero, Eric; Hamilton, Brian; Jimenez, Noe; Romero-García, Vicent; Groby, Jean Philippe; Aygun, Haydar; Dance, Stephen (MDPI AG, 2021-09)

[EN] Most simulations involving metamaterials often require complex physics to be solved through refined meshing grids. However, it can prove challenging to simulate the effect of local physical conditions created by said ...
Spiral sound-diffusing metasurfaces based on holographic vortices

Jimenez, Noe; Groby, Jean-Philippe; Romero-García, Vicent (Nature Publishing Group, 2021-05-13)

[EN] In this work, we show that scattered acoustic vortices generated by metasurfaces with chiral symmetry present broadband unusual properties in the far-field. These metasurfaces are designed to encode the holographic ...
Subwavelength Broadband Perfect Absorption for Unidimensional Open-Duct Problems

Meng, Yang; Romero-García, Vicente; Gabard, Gwénaël; Groby, Jean-Philippe; Bricault, Charlie; Goudé, Sébastien (Wiley-VCH Verlag GmbH & Co. KGaA, 2023-06)

[EN] Passive metamaterials provide efficient solutions for sound absorption in the low-frequency regime with deep subwavelength dimensions. They have been extensively applied in unidimensional reciprocal problems considering ...
Underwater metamaterial absorber with impedance-matched composite

Qu, Sichao; Gao, Nan; Tinel, Alain; Morvan, Bruno; Romero-García, Vicente; Groby, Jean-Philippe; Sheng, Ping (American Association for the Advancement of Science, 2022-05-20)

[EN] By using a structured tungsten-polyurethane composite that is impedance matched to water while simultaneously having a much slower longitudinal sound speed, we have theoretically designed and experimentally realized ...
Wave transport in stealth hyperuniform materials: The diffusive regime and beyond

Chéron, Élie; Simon, Felix; Groby, Jean Philippe; Pagneux, Vincent; Romero-García, Vicente (American Institute of Physics, 2022-08-08)

[EN] By varying the degree of correlation in stealthy hyperuniform (SHU) materials, the continuous evolution from uncorrelated disorder to periodic media is possible and allows us, as such, to study the fate of the bimodal ...
Zero-phase propagation in realistic plate-type acoustic metamaterials

Malléjac, M.; Merkel, A.; Sánchez-Dehesa Moreno-Cid, José; Christensen, J.; Tournat, V.; Groby, Jean-Philippe; Romero García, Vicente (American Institute of Physics, 2019-09-23)

[EN] We theoretically, numerically, and experimentally analyze the Density-Near-Zero (DNZ) regime of a one-dimensional acoustic metamaterial. This acoustic metamaterial is composed of thin elastic plates periodically clamped ...