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Listar por palabra clave "Acoustic impedance"

Mostrando ítems 1-12 de 12

A model for acoustic absorbent materials derived from coconut fiber

Ramis Soriano, Jaime; Rey Tormos, Romina María del; Alba Fernández, Jesús; Godinho, Luis; Carbajo, Jesús (CSIC, 2014)

[EN] In the present paper, a methodology is proposed for obtaining empirical equations describing the sound absorption characteristics of an absorbing material obtained from natural fibers, specifically from coconut. The ...
Acoustic characteristics of circular dissipative reversing chamber mufflers

Denia, F. D.; Antebas, Antoine; Selamet, A.; Pedrosa Sanchez, Ana Maria (Institute of Noise Control Engineering, 2011)

[EN] In this work, a three-dimensional analytical model is presented for the propagation of sound in circular dissipative reversing chamber mufflers with perforated frontal plates and bulk-reacting fibrous material. The ...
Acoustic properties of porous concrete made from arlite and vermiculite lightweight aggregates

Carbajo San Martín, Jesús; Esquerdo Lloret, Tomás Vicente; Ramis Soriano, Jaime; Nadal Gisbert, Antonio Vicente; Denia Guzmán, Francisco David (CSIC, 2015)

[EN] The use of sustainable materials is becoming a common practice for noise abatement in building and civil engineering industries. In this context, many applications have been found for porous concrete made from lightweight ...
Analysis of equivalent anisotropy arising from dual isotropic layers of acoustic media

Cai, Liang-Wu; Sánchez-Dehesa Moreno-Cid, José (Acoustical Society of America, 2012-10)

The equivalence between a single mass-anisotropic layer and two isotropic layers is analyzed by studying two systems: one consists of an anisotropic layer sandwiched between two arbitrarily chosen isotropic media; and the ...
Analytical model to predict the effect of a finite impedance surface on the propagation properties of 2D Sonic Crystals

Romero García, Vicente; Sánchez Pérez, Juan Vicente; García Raffi, Luis Miguel (IOP Publishing: Hybrid Open Access, 2011)

The use of sonic crystals (SCs) as environmental noise barriers has certain advantages from both the acoustical and the constructive points of view with regard to conventional ones. However, the interaction between the SCs ...
Evaluation of acoustic and dynamic behaviour of ethylene vinyl acetate panels

Nadal Gisbert, Antonio Vicente; Segura Alcaraz, Jorge Gabriel; Juliá Sanchis, Ernesto; Gadea Borrell, José Mª; Montava-Belda, Isaac (John Wiley & Sons, 2019-01)

[Otros] Ethylen-Vinylacetat-Platten mit hohem Vinylacetatgehalt und einer geschlossenen Zellenstruktur wurden durch verschiedene experimentelle Techniken als ein erster Ansatz zur Bewertung des Vibrations- und Akustikverhaltens ...
Experimental realization of broadband tunable resonators based on anisotropic metafluids

Spiousas, Ignacio; Torrent Martí, Daniel; Sánchez-Dehesa Moreno-Cid, José (American Institute of Physics, 2011-06-13)

This letter demonstrates the mechanical tuning of modes confined in two-dimensional acoustic cavities based on anisotropic metafluids. The employed metafluids have been designed with effective parameters such that the ...
High sound screening in low impedance slit arrays

Estrada, Héctor; Bravo Plana-Sala, José Mª; Meseguer Rico, Francisco Javier (IOP Publishing: Open Access Journals, 2011)

We report on the key role of the acoustical impedance ratio between the solid and the host fluid in the transmission properties of slit arrays. Numerical calculations predict huge sound screening effects up to 60 dB for ...
IMPACT ACOUSTIC ISOLATION OF ETHYLENE VINYL ACETATE PANELS

Segura Alcaraz, Jorge Gabriel; Juliá Sanchis, Ernesto; Gadea Borrell, José Mª (Asociatia Pentru Inginerie Integrata Si Management Industrial, 2015)

[EN] Ethylene Vinyl Acetate (EVA) foam is used in fitness facilities floors because of its shock absorption and isolation properties. Varying some material properties such as density and thickness, a range of these materials ...
Investigando las anomalías de un trombón de varas de alta gama en su respuesta en impedancia y en los resultados de un estudio perceptual

Esteve Rico, Juan Carlos; Castiñeira Ibáñez, Sergio; Vera Guarinos, Jenaro; Rubio Michavila, Constanza (Universidade do Porto, 2016-06-15)

[ES] A partir de la respuesta en impedancia de varios trombones de la misma tesitura, se obtuvo que el modelo Bach 42; que era uno de los instrumentos que mayor garantía ofrecían, a priori, dentro del conjunto estudiado, ...
Nuevos materiales absorbentes acústicos basados en fibra de kenaf

Ramis Soriano, Jaime; Alba Fernández, Jesús; Rey Tormos, Romina María del; Escuder Silla, Eva María; Sanchis Rico, Vicente Jorge (Consejo Superior de Investigaciones Científicas (CSIC), 2010)

Acoustic Standards in the building are responsible for, companies and individuals, propose new acoustic materials for the sound isolation. This paper presents a new sound-absorbent material, it is based on natural fibres, ...
Omnidirectional broadband acoustic absorber based on metamaterials

Climente Alarcón, Alfonso; Torrent Martí, Daniel; Sánchez-Dehesa Moreno-Cid, José (American Institute of Physics, 2012-04-06)

We present the design, construction, and experimental characterization of the acoustic analogue of the so called photonic black-hole. The fabricated sample has cylindrical symmetry and consists of two parts, a shell that ...