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 ...
Herrero Durá, Iván; Zaragozá Dolz, José Javier; Picó Vila, Rubén; Sánchez Morcillo, Víctor José; García-Raffi, L. M.(Sociedad Española de Acústica (SEA), 2015)
[EN] In this experimental study the attenuation properties
of the sound transmitted through a multilayer structure is
analyzed. The layers consist of a saturated gas-vapordroplet
suspension with a known size distribution. ...
Romero García, Vicente; Fuster García, Elíes; García-Raffi, L. M.; Sánchez Pérez, Enrique Alfonso; Sopena Novales, Mario; Llinares Galiana, Jaime; Sánchez Pérez, Juan Vicente(American Institute of Physics (AIP), 2006)
It is well known that sonic crystals are periodic structures that present acoustic band gaps attenuation centered at frequencies related with the lattice constant of the structure. We present an approach based on genetic ...
Lázaro, Mario; García-Raffi, L. M.(MDPI AG, 2022-03)
[EN] In this paper, a new methodology for the determination of the boundaries between oscillatory and non-oscillatory motion for nonviscously damped nonproportional systems is proposed. It is assumed that the damping forces ...
This work theoretically analyzes the sound absorption properties of a chirped multi-layer porous material including transmission, in particular showing the broadband unidirectional absorption properties of the system. Using ...
[EN] The broadband reduction of the specular reflections by sonic crystals (SCs) is theoretically and experimentally reported in this work. The analysed system consists of a sound source radiating a SC made of acoustically ...
Romero García, Vicente; Krynkin, A.; García-Raffi, L. M.(Sociedad Española de Acústica (SEA), 2010)
[EN] During the last few years there has been increasing interest in designing devices for controlling noise. In this work experimental data and numerical simulations are presented for the noise attenuation provided by ...
Gallardo Pardo, Eduardo(Universitat Politècnica de València, 2019-10-17)
[ES] Supondría una mejora para los ciudadanos la creación de un modelo matemático
predictivo, que proporcionara la inteligencia necesaria para el diseño de un programa
chatbot. Dicho robot ofrecería un servicio ininterrumpido ...
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 ...
Escartí-Guillem, M. S.; Hoyas, S; García-Raffi, L. M.(Elsevier, 2023-12)
[EN] The acoustic pressure level generated during lift-off and the associated vibrations can significantly affect the payload of a launch vehicle. Optimizing the plume deflector is one of the most effective methods to ...
Aguilar Fuertes, José Javier(Universitat Politècnica de València, 2019-11-18)
[ES] En este trabajo se ha desarrollado e implementado en Fortran un algoritmo en paralelo
para detectar y seguir la evolución temporal de los vórtices presentes en un
ujo turbulento
calculado mediante simulaciones ...
Castiñeira Ibáñez, Sergio; Rubio Michavila, Constanza; Romero García, Vicente; Sánchez Pérez, Juan Vicente; García Raffi, Luis Miguel(De Gruyter, 2012)
In this work we present the design and the manufacturing processes, as well as the acoustics standard-ization tests, of an acoustic barrier formed by a set of multi-phenomena cylindrical scatterers. Periodic arrangements ...
Calabuig, J. M.; Falciani, Hervé; Ferrer Sapena, Antonia; García-Raffi, L. M.; Raso, E.; Sánchez del Toro, I.; Sánchez Pérez, Enrique Alfonso(Transparencia Internacional España, 2018)
[EN] In this article reference is made to the possible use of mathematical tools in the
prevention and detection of fraud.
The detection of fraud is considered one of the biggest challenges for public
administrations. ...
[EN] the introduction of modeling in the secondary level
demands the reconsideration about the teaching
methodology that promotes and stimulates this
activity in classroom. In this paper we present a
classroom experience ...
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 ...
Cebrecos Ruiz, Alejandro; Picó Vila, Rubén; Sánchez Morcillo, Víctor José; Staliünas, Kestutis; Romero García, Vicente; García-Raffi, L. M.(American Institute of Physics (AIP): Open Access Journals, 2014-12)
The enhancement of sound inside a two dimensional exponentially chirped crystal during the soft reflections of waves is experimentally and theoretically explored in this work. The control of this enhancement is achieved ...
Arnau Notari, Andres Roger; García Raffi, Luis Miguel; Calabuig Rodriguez, Jose Manuel; Sánchez Pérez, Enrique Alfonso(Editorial Universitat Politècnica de València, 2023-10-06)
[ES] En este trabajo se presenta una sesión a modo de taller orientada al estudiantado universitarios para que entiendan los fundamentos del aprendizaje por refuerzo (RL). Esta técnica de inteligencia artificial no es ...
García Melero, Carlos(Universitat Politècnica de València, 2020-10-15)
[ES] Uno de los puntos más críticos durante el lanzamiento de un vehículo espacial se encuentra en los primeros instantes. En este periodo en el que se produce una gran aceleración, esta genera una gran cantidad de ruido ...
Romero García, Vicente; Sánchez Pérez, Juan Vicente; García Raffi, Luis Miguel(American Institute of Physics (AIP), 2010)
Evanescent modes in complete sonic crystals (SCs) and SC with point defects are reported both theoretically and experimentally in this paper. Plane wave expansion (PWE) and in general, ω(k)ω(k) methods have been used to ...
Romero García, Vicente; García Raffi, Luis Miguel; Sánchez Pérez, Juan Vicente(American Institute of Physics, 2011)
The properties of sonic crystals (SC) are theoretically investigated in this work by solving the inverse problem k(¿) using the extended plane wave expansion (EPWE). The solution of the resulting eigenvalue problem gives ...