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Browsing by Author "Groby, J.-P."

Now showing items 1-14 of 14

Design of acoustic metamaterials made of Helmholtz resonators for perfect absorption by using the complex frequency plane

Romero-García, V.; Jimenez, Noe; Theocharis, G.; Achilleos, V.; Merkel, A.; Richoux, O.; Tournat, V.; Groby, J-P; Pagneux, V. (Elsevier, 2020)

[Otros] Dans cette revue, nous présentons des résultats sur l'absorption acoustique parfaite sub-longueur d'onde faisant appel à des métamatériaux acoustiques avec des résonateurs Helmholtz pour différentes configurations. ...
Experimental evidence of a hiding zone in a density-near-zero acoustic metamaterial

Malléjac, M.; Merkel, A.; Sánchez-Dehesa Moreno-Cid, José; Christensen, J.; Tournat, V.; Romero-García, V.; Groby, J.-P. (American Institute of Physics, 2021-04-14)

[EN] This paper examines the feasibility of cloaking an obstacle using Plate-type Acoustic Metamaterials (PAMs). We present two distinct strategies to cloak this obstacle, using either the near-zero-density regime of a ...
Interpretation of the Acoustic Black Hole effect based on the concept of critical coupling

Leng, J.; Romero García, Vicente; Pelat, A.; Picó Vila, Rubén; Groby, J.P.; GAUTIER, FRANÇOIS (Elsevier, 2020-04-14)

[EN] An Acoustic Black Hole (ABH) in a one-dimensional (1D) beam is a passive vibration damping device based on a local reduction of the beam thickness attached to a thin layer of attenuating material. This work aims at ...
Limits of flexural wave absorption by open lossy resonators: reflection and transmission problems

Leng, J.; Gautier, F.; Pelat, A.; Picó Vila, Rubén; Groby, J-P; Romero García, Vicente (IOP Publishing, 2019-05-06)

[EN] The limits of flexural wave absorption by open lossy resonators are analytically and numerically reported in this work for both the reflection and transmission problems. An experimental validation for the reflection ...
Metadiffusers for quasi-perfect and broadband sound diffusion

Ballestero, E.; Jimenez, Noe; Groby, J.-P.; Aygun, H.; Dance, S.; Romero-García, V. (American Institute of Physics, 2021-07-26)

[EN] Sound diffusion refers to the ability of a surface to evenly scatter sound energy in both time and space. However, omni-directional radiation of sound, or perfect diffusion, can be impractical or difficult to reach ...
Metadiffusers: Deep-subwavelength sound diffusers

Jimenez, Noe; Cox, Trevor J.; Romero García, Vicente; Groby, J.P. (Nature Publishing Group, 2017-07-14)

[EN] We present deep-subwavelength diffusing surfaces based on acoustic metamaterials, namely metadiffusers. These sound diffusers are rigidly backed slotted panels, with each slit being loaded by an array of Helmholtz ...
Metamateriaux pour l'acoustique audible : Absorption parfaite et diffusion sublongueur d'onde

Romero-García, Vicente; Pagneux, Vincent; Groby, J.P.; Jimenez, Noe; Ballestero, Eric (Centre d'information et de documentation sur le bruit (France), 2020)

[FR] Dans ce travail, nous montrons les possibilités des métamatériaux acoustiques pour la conception de matériaux structurés sublongueur d'onde dans les cas de l¿absorption parfaite et la diffusion du son. Basé sur les ...
Natural sonic crystal absorber constituted of seagrass (Posidonia Oceanica) fibrous spheres

Barguet, L.; Romero-García, V.; Jimenez, Noe; García-Raffi, L. M.; Sánchez Morcillo, Víctor José; Groby, J.-P. (Nature Publishing Group, 2021-01-12)

[EN] We present a 3-dimensional fully natural sonic crystal composed of spherical aggregates of fibers (called Aegagropilae) resulting from the decomposition of Posidonia Oceanica. The fiber network is first acoustically ...
Perfect Absorption in Mirror-Symmetric Acoustic Metascreens

Romero-García, V.; Jimenez, Noe; Groby, J.-P.; Merkel, A.; Tournat, V.; Theocharis, G.; Richoux, O.; Pagneux, V. (American Physical Society, 2020-11)

[EN] Mirror-symmetric acoustic metascreens producing perfect absorption independently of the incidence side are theoretically and experimentally reported in this work. The mirror-symmetric resonant building blocks of the ...
Perfect Absorption of Sound by Rigidly-Backed High-Porous Materials

Jimenez, Noe; Romero García, Vicente; Groby, J.P. (S. Hirzel Verlag, 2018-05)

[EN] We present the conditions to observe perfect sound absorption by rigidly-backed layers of rigid-frame highporous materials. We theoretically analyze different configurations of increasing complexity: a single layer ...
Quasi-perfect absorption by sub-wavelength acoustic panels in transmission using accumulation of resonances due to slow sound

Jimenez, Noe; Romero García, Vicente; Pagneux, Vincent; Groby, J.P. (AMERICAN PHYSICAL SOCIETY, 2017)

[EN] We theoretically and experimentally report sub-wavelength resonant panels for low-frequency quasi-perfect sound absorption including transmission by using the accumulation of cavity resonances due to the slow sound ...
Rainbow-trapping absorbers: Broadband, perfect and asymmetric sound absorption by subwavelength panels for transmission problems

Jimenez, Noe; Romero García, Vicente; Pagneux, Vincent; Groby, J.P. (Nature Publishing Group, 2017)

[EN] Perfect, broadband and asymmetric sound absorption is theoretically, numerically and experimentally reported by using subwavelength thickness panels in a transmission problem. The panels are composed of a periodic ...
Ultra-thin metamaterial for perfect and quasi-omnidirectional sound absorption

Jimenez, Noe; Huang, Weichung; Romero García, Vicente; Pagneux, Vincent; Groby, J.P. (American Institute of Physics, 2016)

[EN] Using the concepts of slow sound and critical coupling, an ultra-thin acoustic metamaterial panel for perfect and quasi-omnidirectional absorption is theoretically and experimentally conceived in this work. The system ...
Wave transport in 1D stealthy hyperuniform phononic materials made of non-resonant and resonant scatterers

Romero García, Vicente; Chéron, É.; Kuznetsova, S.; Groby, J.-P.; Félix, S.; Pagneux, V.; García-Raffi, L. M. (AIP Publishing LLC, 2021-10-01)

[EN] Stealthy hyperuniform point patterns are characterized by a vanishing spatial Fourier transform around the origin of the reciprocal vector space. The long-range point density fluctuations are suppressed as well in ...