[EN] The optimal absorption of flexural energy by the critical coupling of a locally resonant grating embedded in a thin plate is reported in this work for the reflection and transmission problems. The grating is made of ...
Herrero Durá, Juan Manuel; Garcia-Nieto, Sergio; Blasco, Xavier; Romero García, Vicente; Sánchez Pérez, Juan Vicente; García-Raffi, L. M.(Springer-Verlag, 2009-08)
[EN] This paper shows a promising method for acoustic barrier design using a new acoustic material called Sonic Crystals (SCs). The configuration of these SCs is set as a multiobjective optimization problem which is very ...
Castiñeira Ibáñez, Sergio; Romero García, Vicente; Sánchez Pérez, Juan Vicente; García-Raffi, L. M.(European Physical Society, 2010-11)
The transmission of acoustic waves in a fractal distribution of rigid scatterers embedded in air is reported in this work. The Sierpinsky fractal is used to produce a compact small device containing several periodicities, ...
[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 ...
[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 ...
[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 ...
Romero García, Vicente; Sánchez Pérez, Juan Vicente; García-Raffi, L. M.(IOP Publishing: Open Access Journals, 2010-08)
Complex band structures and multiple scattering theory have been
used in this paper to analyze the overlapping of the evanescent waves localized
in point defects in sonic crystals (SCs). The extended plane wave ...
[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 ...
García-Raffi, L. M.; Salmerón-Contreras, L. J.; Herrero-Durá, Iván; Picó Vila, Rubén; Redondo, Javier; Sánchez Morcillo, Víctor José; Cebrecos, Alejandro; Jimenez, Noe; Romero García, Vicente; Staliunas, K.(Universidade do Porto, 2016-06-15)
[EN] From the acoustical point of view one of the most extreme events is the lift-off of a rocket. In such events, an enormous amount of energy is liberated in the form of acoustic waves that are reflected in the launch ...
The propagation of nonlinear compressional waves in a one-dimensional granular chain driven at one end by a harmonic excitation is studied. The chain is described by a Fermi-Pasta-Ulam (FPU) lattice model with quadratic ...
Jimenez, Noe; Romero García, Vicente; García-Raffi, L. M.; Camarena Femenia, Francisco; Staliunas, Kestutis(American Institute of Physics, 2018-05)
[EN] We report the optimal focusing of acoustic vortex beams by using flat lenses based on a Fresnelspiral
diffraction grating. The flat lenses are designed by spiral-shaped Fresnel zone plates composed
of one or several ...
Malléjac, M.; Sheng, P.; Tournat, V.; Romero-García, Vicente; Groby, J. P.(American Physical Society, 2022-04-19)
[EN] Periodic structures composed of quarter-wavelength or Helmholtz resonators have been widely used in the design of acoustic metamaterials. An interesting phenomenon achievable through hybridization in such structures ...
[EN] Dispersion and scattering properties of a soft solid plate with solid cylindrical inclusions embedded in are theoretically and numerically reported in this work. The system is numerically analyzed considering both the ...
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 ...
[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 ...
Kuznetsova, S.; Groby, J. P.; García-Raffi, L. M.; Romero-García, Vicente(Taylor & Francis, 2021-07)
[EN] We report a procedure to design two-dimensional acoustic structures with prescribed scattering properties. The structures are designed from targeted properties in the reciprocal space so that their structure factors, ...
Fuster García, Elíes; Romero García, Vicente; Sánchez Pérez, Juan Vicente; García-Raffi, L. M.(American Institute of Physics (AIP), 2007)
[EN] Sonic crystals are periodic structures that have acoustic band gaps centred at frequencies depending on the lattice constant of the array and on the direction of the incident acoustic wave. To eliminate this dependence, ...
[EN] The finite-element time-domain method for elastic band-structure calculations is presented in this paper. The method is based on discretizing the appropriate equations of motion by finite elements, applying Bloch ...
Romero García, Vicente; VASSEUR, J.O; García-Raffi, L. M.; Hladky-Hennion, A.C.(IOP Publishing: Open Access Journals, 2012-02)
The complex band structures calculated using the extended plane
wave expansion (EPWE) reveal the presence of evanescent modes in periodic
systems, never predicted by the classical ω(kE) methods, providing novel
interpretations ...
Romero García, Vicente; Sánchez Pérez, Juan Vicente; García-Raffi, L. M.(American Institute of Physics (AIP), 2011)
The physical properties of a periodic distribution of absorbent resonators is used in this work to design a tunable wideband bandstop acoustic filter. Analytical and numerical simulations as well as experimental validations ...