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Mostrando ítems 1-20 de 21

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Acoustic Bessel-like beam formation by an axisymmetric grating

Jimenez, Noe; Romero García, Vicente; Picó Vila, Rubén; Cebrecos Ruiz, Alejandro; Sánchez Morcillo, Víctor José; García-Raffi, L. M.; Sánchez Pérez, Juan Vicente; Staliünas, Kestutis (European Physical Society, 2014-04)

We report Bessel-like beam formation of acoustic waves by means of an axisymmetric grating of rigid tori. The results show that the generated beam pattern is similar to that of Bessel beams, characterized by elongated ...
Acoustically penetrable sonic crystals based on fluid-like scatterers

Cebrecos Ruiz, Alejandro; Romero García, Vicente; Picó Vila, Rubén; Sánchez Morcillo, Víctor José; Botey, M.; Herrero, R.; Cheng, Y. C.; Staliünas, Kestutis (IOP Publishing: Hybrid Open Access, 2015-01-21)

We propose a periodic structure that behaves as a fluid fluid composite for sound waves, where the building blocks are clusters of rigid scatterers. Such building-blocks are penetrable for acoustic waves, and their properties ...
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 ...
Asymmetric propagation using enhanced self-demodulation in a chirped phononic crystal

Cebrecos, Alejandro; Jimenez, Noe; Romero García, Vicente; Picó Vila, Rubén; Sánchez Morcillo, Víctor José; García-Raffi, L. M. (AIP Publishing, 2016-12)

Asymmetric propagation of acoustic waves is theoretically reported in a chirped phononic crystal made of the combination of two different nonlinear solids. The dispersion of the system is spatially dependent and allows the ...
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 ...
Critical relationships in nonviscous systems with proportional damping

Lázaro, Mario; García-Raffi, L. M. (Elsevier, 2020-10-27)

[EN] Materials with time-dependent dissipative behavior currently play an important role in the design of new mechanisms for vibration control in civil, automotive, aeronautical and mechanical engineering. Damping forces ...
Delay time of waves performing Levy walks in 1D random media

Razo-López, L. A.; Fernández-Marín, A. A.; Mendez-Bermudez, J. A.; Sánchez-Dehesa Moreno-Cid, José; Gopar, V. A. (Nature Publishing Group, 2020-11-30)

[EN] The time that waves spend inside 1D random media with the possibility of performing Lévy walks is experimentally and theoretically studied. The dynamics of quantum and classical wave diffusion has been investigated ...
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. ...
Elastodynamical properties of Sturmian structured media

Lázaro, Mario; Niemczynowicz, A.; Siemaszko, A.; García-Raffi, L. M. (Elsevier, 2022-01-20)

[EN] In this paper, wave propagation in structured media with quasiperiodic patterns is investigated. We propose a methodology based on Sturmian sequences for the generation of structured mechanical systems from a given ...
Enhanced transmission band in periodic media with loss modulation

Cebrecos Ruiz, Alejandro; Picó Vila, Rubén; Romero García, Vicente; Yasser, A. M.; Maigyte, L.; Herrero, R.; Botey, M.; Sánchez Morcillo, Víctor José; Staliünas, Kestutis (American Institute of Physics (AIP), 2014-11-17)

We study the propagation of waves in a periodic array of absorbing layers. We report an anomalous increase of wave transmission through the structure related to a decrease of the absorption around the Bragg frequencies. ...
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 ...
Hot-air ultrasound-assisted drying of green wheat and barley malts to enhance process kinetics, amylase activity and their application in bread formulation

Carregari-Polachini, Tiago; Carcel, J. A.; Norwood, Eve Anne; Chevallier, Sylvie Swyngedau; Le-Bail, Patricia; Le-Bail, Alain (Elsevier, 2023-11)

[EN] Malting produces techno-functional cereal ingredients but it is considered a time-con-suming process. The assistance of ultrasound (US) appears to enhance the drying step of the green malts. In this sense, partially ...
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 ...
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 ...
NaCl precleaning of microfiltration membranes fouled with oil-in-water emulsions: Impact on fouling dislodgment

Rouquié, C.; Szymczyk, A.; Rabiller-Baudry, M.; Roberge, H.; Abellan, P.; Riaublanc, A.; Frappart, M.; Alvarez Blanco, Silvia; Couallier, E. (Elsevier, 2022-03-15)

[EN] Despite the growing interest in membrane filtration for biorefining of microalgae, few works have dealt with membrane regeneration after fouling by such specific vegetable products. The current procedure still requires ...
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 ...
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 ...
Sound absorption and diffusion by 2D arrays of Helmholtz resonators

Herrero-Durá, Iván; Cebrecos, Alejandro; Picó Vila, Rubén; Romero-García, Vicente; García-Raffi, L. M.; Sánchez Morcillo, Víctor José (MDPI AG, 2020-03)

[EN] We report a theoretical and experimental study of an array of Helmholtz resonators optimized to achieve both efficient sound absorption and diffusion. The analysis starts with a simplified 1D model where the plane ...
Stealth Acoustic Materials

Romero-García, V.; Lamothe, N.; Theocharis, G.; Richoux, O.; García-Raffi, L. M. (American Physical Society, 2019-05-28)

[EN] We report the experimental design of a one-dimensional stealth acoustic material, namely a material that suppresses the acoustic scattering for a given set of incident wave vectors. The material consists of multiple ...
Sub-Diffractive Acoustic Vortices by Nonlinear Mixing

Jimenez, Noe; Ealo, Joao; Muelas-Hurtado, Rubén; Duclos, Aroune; Romero-García, Vicent (IEEE, 2021-09-16)

[EN] Vortex beams, characterized by a collimated wavefront with a phase dislocation at their principal axis, have found practical applications to construct acoustic tweezers for particle trapping and manipulation, or ...