WO2011048484A1 - Acoustic shield - Google Patents

Acoustic shield Download PDF

Info

Publication number
WO2011048484A1
WO2011048484A1 PCT/IB2010/002719 IB2010002719W WO2011048484A1 WO 2011048484 A1 WO2011048484 A1 WO 2011048484A1 IB 2010002719 W IB2010002719 W IB 2010002719W WO 2011048484 A1 WO2011048484 A1 WO 2011048484A1
Authority
WO
WIPO (PCT)
Prior art keywords
fractal
acoustic
dispersing
acoustic screen
centers
Prior art date
Application number
PCT/IB2010/002719
Other languages
Spanish (es)
French (fr)
Inventor
Juan Vicente SANCHÉZ PÉREZ
Luis Miguel Garcia Raffi
Vicente Romero Garcia
Original Assignee
Universidad Politécnica De Valencia
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Universidad Politécnica De Valencia filed Critical Universidad Politécnica De Valencia
Publication of WO2011048484A1 publication Critical patent/WO2011048484A1/en

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
    • E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement

Definitions

  • the invention relates to an acoustic screen whose objective is the attenuation of sound in the audible range and in airborne transmission, intended to interpose between the source generating the sound and the receiver.
  • the screen is based on the so-called sound crystals, defined as a non-homogeneous composite medium formed by dispersing centers of the acoustic waves arranged periodically and immersed in another medium of different physical properties, so that they act on the sound waves preventing transmission through a mechanism of multiple reflection.
  • the invention has application in the screening of urban and interurban communication roads (roads, railways, ...) in order to isolate the surrounding areas from noise.
  • Sound crystals are structures formed by the orderly repetition of scattering centers for sound waves. These crystals have the characteristic of modifying the behavior of phenomena of a wave nature that are transmitted inside. In these crystals consistent dispersion of the acoustic wave propagating therein is produced, appearing propagation prohibited to determine frequency bands Nados intervals, depending on its position
  • CONFIBMATION CO py in the frequency range of the geometric characteristics of the crystal. In this way the acoustic waves whose frequency falls within one of these prohibited propagation bands will not be able to propagate inside the crystal and will be reflected when they hit it.
  • Fractal is understood as an object whose basic structure, fragmented or irregular, is repeated at different scales.
  • the present invention provides an acoustic screen that maximizes the attenuation of sound waves, especially affecting the range of low frequencies, through a smaller number of centers.
  • dispersers that those that present a distribution of the dispersing centers according to a crystalline network (sound crystals) lightening the screen and also achieving that the wind load that it supports is less. These two factors make the screen need no foundation.
  • this screen acts especially well in the low frequency range, which is usually the most difficult band to attenuate.
  • the acoustic screen object of the invention comprises dispersing centers for acoustic waves arranged on a support base.
  • the invention is characterized in that the dispersing centers are distributed on the base according to a modified fractal symmetry.
  • Fractal symmetry has been modified due to the fact that the dispersing centers belonging to each of the fractal orders have a different size section than the rest of the fractal orders. This implies that some of the original fractal cylinders have been removed to allow section variation.
  • each fractional order has a minimum mass of dispersing centers and therefore the width of the attenuated frequency band and the achieved attenuation level are maximized.
  • Each fractal order used has a network parameter, that is, a different distance between dispersing centers, which attenuates a different frequency band, achieving a wider attenuation band than in the case of a single sound crystal, which has A single network parameter.
  • Fractal symmetry makes the frequency attenuation band wider, so that the attenuated frequency band is also wider. That is, the properties of the multiple reflection of the network of dispersing centers are maximized, for the reasons set forth in the two preceding paragraphs. Due to what has been stated in the previous paragraphs, the higher fractal orders (of greater separation between dispersing centers) could have a very high separation. However, the fifth fractal order has been reached with a compromise between the width of the attenuated frequency band and the resulting width of the screen, which should be as small as possible.
  • the advantages obtained with the device object of the invention are: attenuation throughout the range the audible range especially the low fre ⁇ ences, obtaining a higher level of attenuation in a range wider frequency using fewer scattering centers. This last advantage allows to reduce the cost of the screen and increase its portability.
  • Figure 1 is a schematic plan representation of an embodiment of a cylinder arrangement according to a fractal symmetry, called the Sierpinski triangle.
  • Figure 2 is a representation of a plan section of a modified fractal unit that is part of the acoustic screen object of the invention.
  • Figure 3 is a plan representation of an acoustic screen module formed by three fractal units according to the example of embodiment corresponding to Figure 2.
  • Figure 4 is an elevation representation of the module corresponding to Figure 3.
  • the acoustic screen corresponding to the exemplary embodiment and shown in the figures comprises cylinders (1.1, 1.2, 1.3, 1.4, 1.5) as dispersed centers. sores (1) located on a socket (2).
  • the cylinders (1.1, 1.2, 1.3, 1.4, 1.5) are distributed according to a fractal symmetry in which the cylinders (1.1, 1.2, 1.3, 1.4, 1.5) corresponding to each fractal order have a different diameter than cylinders (1.1, 1.2, 1.3, 1.4, 1.5) corresponding to other fractal orders.
  • the exemplary embodiment comprises five fractal orders each formed by cylinders (1.1, 1.2, 1.3, 1.4, 1.5) of equal diameter.
  • the diameter of the cylinders (1.1, 1.2, 1.3, 1.4, 1.5) increases in each of the fractal orders.
  • the diameter of the cylinders (1.1, 1.2, 1.3, 1.4, 1.5) in each fractal order many of the cylinders (1.1, 1.2, 1.3, 1.4, 1.5) of the fractal called Sier-pinski triangle have been eliminated.
  • the cylinders (1.1) of the first fractal order have a larger diameter than the cylinders (1.2) of the second fractal order and so on with the rest of the cylinders (1.3, 1.4, 1.5) corresponding to the third, fourth and fourth fractal orders fifth.
  • the distribution of the cylinders (1.1, 1.2, 1.3, 1.4, 1.5) is carried out, in the example shown in the figures, according to a fractal symmetry called the Sierpinski triangle.
  • the acoustic screen of the exemplary embodiment is comprised of modules, according to Figure 3, which are formed by three fractal units of the modified Sierpinski triangle. In this way the modules can be placed one after the other allowing any length of the acoustic screen. Three fractal units are chosen to facilitate the transport of the module.
  • the screen of the embodiment could consist of cylinders (1.1, 1.2, 1.3, 1.4, 1.5) of different heights.
  • the cylinders (1.1, 1.2, 1.3, 1.4, 1.5) are made of a sound-reflective material, for example, galvanized iron, PVC, aluminum, steel, crushed and pressed tire rubber, plexiglass, concrete.
  • the acoustic screen object of the invention has sound attenuation by other phenomena such as resonance and absorption. These acoustic effects have been used to increase the attenuation power of the device.
  • the resonance that is to say, the destruction of acoustic waves by friction and vibration, is achieved by means of the longitudinal grooving (1.1.1, 1.2.1, 1.3.1, 1.4.1) of some of the cylinders that can be hollow. - throwing them in Helmholtz resonators. Not all cylinders (1.1, 1.2, 1.3, 1.4) have to present the aforementioned longitudinal grooving (1.1.1, 1.2.1, 1.3.1, 1.4.1), in the exemplary embodiment shown in Figure 3 they are arranged slotted cylinders (1.1, 1.2, 1.3, 1.4) of fractal orders first to fourth and those of smaller size (1.5) without grooving. Specifically, the slot opening can be between 45 ° and 180 °.
  • the dispersing centers (1) may also comprise acoustic absorbent material, such as, for example, rock wool, glass wool, wood or sugar cane fibers, expanded polystyrene, absorbent paints, plaster-based porous plasters or vermiculite or chopped tire rubber.
  • acoustic absorbent material such as, for example, rock wool, glass wool, wood or sugar cane fibers, expanded polystyrene, absorbent paints, plaster-based porous plasters or vermiculite or chopped tire rubber.
  • the absorbent material can be located on the outer face of the dispersing center (1) or on the inner face or both and cover all or part thereof.
  • the support base (2) is made of concrete and the cylinders (1.1, 1.2, 1.3, 1.4, 1.5) are arranged embedded in it so that it is achieved that they are arranged in an upright position. The set would rest on the ground directly without the need for any type of anchorage, which affects its portability. In this way the modules can be placed next to each other thus configuring an acoustic screen of the desired length.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Building Environments (AREA)

Abstract

The invention relates to an acoustic shield for attenuating sound in the audible range and upon aerial transmission, said shield being placed between the sound source and the receiver. Said shield is based on sonic crystals, which are defined as a non-homogeneous composite medium formed by sound-dispersing centres arranged in accordance with a crystalline symmetry. The dispersing centres have been arranged in said shield in accordance with a fractal symmetry modified by the increase in the cross section of some dispersers and the elimination of others, with a view to maximizing attenuation in a broader frequency range using a multiple reflection process. To potentiate this attenuation, the dispersing centres have been modified by being provided with absorbents and by being scored for the insertion of absorption and resonance mechanisms. The invention applies to the screening of urban and intercity highways, with a view to insulating against noise from adjacent areas.

Description

PANTALLA ACÚSTICA  ACOUSTIC SCREEN
DESCRIPCIÓN OBJETO DE LA INVENCIÓN DESCRIPTION OBJECT OF THE INVENTION
La invención se refiere a una pantalla acústica cuyo objetivo es la atenuación del sonido en el rango audible y en transmisión aérea, destinada a interponerse entre la fuente generadora del sonido y el receptor. The invention relates to an acoustic screen whose objective is the attenuation of sound in the audible range and in airborne transmission, intended to interpose between the source generating the sound and the receiver.
La pantalla está basada en los denominados cristales de sonido, definidos como un medio compuesto no homogéneo formado por centros dispersores de las on- das acústicas dispuestos periódicamente e inmersos en otro medio de distintas propiedades físicas, de modo que actúan sobre las ondas sonoras impidiendo la transmisión a su través mediante un mecanismo de reflexión múltiple. La invención posee aplicación en el apantalla- miento de vías de comunicación urbanas e interurbanas (carreteras, ferrocarriles,...) con el objeto de aislar de los ruidos las zonas colindantes. ANTECEDENTES DE LA INVENCIÓN The screen is based on the so-called sound crystals, defined as a non-homogeneous composite medium formed by dispersing centers of the acoustic waves arranged periodically and immersed in another medium of different physical properties, so that they act on the sound waves preventing transmission through a mechanism of multiple reflection. The invention has application in the screening of urban and interurban communication roads (roads, railways, ...) in order to isolate the surrounding areas from noise. BACKGROUND OF THE INVENTION
Los cristales de sonido son estructuras formadas por la repetición ordenada de centros dispersores para ondas sonoras. Estos cristales presentan la caracterís- tica de modificar el comportamiento de los fenómenos de naturaleza ondulatoria que se transmiten en su interior. En estos cristales se produce una dispersión coherente de la onda acústica que se propaga en su interior, ¡apareciendo bandas prohibidas de propagación para determi- nados intervalos de frecuencia, dependiendo su posición Sound crystals are structures formed by the orderly repetition of scattering centers for sound waves. These crystals have the characteristic of modifying the behavior of phenomena of a wave nature that are transmitted inside. In these crystals consistent dispersion of the acoustic wave propagating therein is produced, appearing propagation prohibited to determine frequency bands Nados intervals, depending on its position
CONFIBMATION COpy en el rango de frecuencias de las características geométricas del cristal. De este modo las ondas acústicas cuya frecuencia caiga dentro de una de estas bandas prohibidas de propagación no serán capaces de propagarse por el interior del cristal y serán reflejadas cuando incidan en él. CONFIBMATION CO py in the frequency range of the geometric characteristics of the crystal. In this way the acoustic waves whose frequency falls within one of these prohibited propagation bands will not be able to propagate inside the crystal and will be reflected when they hit it.
Se cita como antecedente la patente española de número de solicitud 200200398 del mismo solicitante y que divulga una pantalla acústica que está constituida por cristales de sonido bidimensionales o tridimensionales formando cualquier red cristalina. The Spanish patent of application number 200200398 of the same applicant is cited as antecedent and discloses an acoustic screen consisting of two-dimensional or three-dimensional sound crystals forming any crystalline network.
Es conocida también la utilización de cristales de sonido como pantallas acústicas que logran una atenuación mediante reflexión de la onda sonora junto con una atenuación por absorción al poseer un material aislante en el interior de los centros dispersores. Es conocida también la existencia de los llama dos cristales fotónicos en los que se utilizan simetrías bidimensionales fractales para la distribución de los centros dispersores de modo que atenúan o incluso eliminan la propagación de ondas electromagnéticas, aunque no es conocida su aplicación para el caso de ondas acústicas . It is also known to use sound crystals as acoustic screens that achieve an attenuation by reflection of the sound wave together with an attenuation by absorption by having an insulating material inside the dispersing centers. It is also known the existence of the two photonic crystals in which two-dimensional fractal symmetries are used for the distribution of the dispersing centers so that they attenuate or even eliminate the propagation of electromagnetic waves, although their application in the case of waves is not known. acoustic
Se entiende por fractal un objeto cuya estructura básica, fragmentada o irregular, se repite a diferen- tes escalas. Fractal is understood as an object whose basic structure, fragmented or irregular, is repeated at different scales.
La presente invención proporciona una pantalla acústica i que permite maximizar la atenuación de las ondas sonoras, incidiendo especialmente en el rango de las bajas frecuencias, mediante un menor número de centros dispersores que aquellas que presentan una distribución de los centros dispersores según una red cristalina (cristales de sonido) aligerándose la pantalla y consiguiendo además que la carga de viento que ésta soporta sea menor. Estos dos factores hacen que la pantalla no necesite cimentación. The present invention provides an acoustic screen that maximizes the attenuation of sound waves, especially affecting the range of low frequencies, through a smaller number of centers. dispersers that those that present a distribution of the dispersing centers according to a crystalline network (sound crystals) lightening the screen and also achieving that the wind load that it supports is less. These two factors make the screen need no foundation.
DESCRIPCIÓN DE LA INVENCIÓN El rango de frecuencias a atenuar está entreDESCRIPTION OF THE INVENTION The frequency range to be attenuated is between
0 Hz y 22000 Hz, correspondientes al rango de audición del oído humano. Sin embargo, esta pantalla actúa especialmente bien en el rango de las bajas frecuencias, que constituye habitualmente la banda más difícil de ate- nuar. 0 Hz and 22000 Hz, corresponding to the hearing range of the human ear. However, this screen acts especially well in the low frequency range, which is usually the most difficult band to attenuate.
La pantalla acústica objeto de la invención comprende centros dispersores para ondas acústicas dispuestos sobre un zócalo de sustentación. The acoustic screen object of the invention comprises dispersing centers for acoustic waves arranged on a support base.
La invención se caracteriza porque los centros dispersores se distribuyen sobre el zócalo según una simetría fractal modificada. La simetría fractal ha sido modificada debido a que los centros dispersores pertenecientes a cada uno de los órdenes fractales poseen una sección de distinto tamaño a la del resto de órdenes fractales. Esto implica que algunos de los cilindros del fractal original han sido eliminados para permitir la variación de secciones. Como consecuencia de esta modificación, cada orden frac- tal posee una masa mínima de centros dispersores y por tanto se maximizan el ancho de la banda |de frecuencias atenuada y el nivel de atenuación conseguido. Cada orden fractal utilizado posee un parámetro de red, es decir, una distancia entre centros disperso- res distinta, que atenúa una banda de frecuencias distinta, consiguiendo una banda de atenuación más amplia que en el caso de un único cristal de sonido, que posee un único parámetro de red. The invention is characterized in that the dispersing centers are distributed on the base according to a modified fractal symmetry. Fractal symmetry has been modified due to the fact that the dispersing centers belonging to each of the fractal orders have a different size section than the rest of the fractal orders. This implies that some of the original fractal cylinders have been removed to allow section variation. As a consequence of this modification, each fractional order has a minimum mass of dispersing centers and therefore the width of the attenuated frequency band and the achieved attenuation level are maximized. Each fractal order used has a network parameter, that is, a different distance between dispersing centers, which attenuates a different frequency band, achieving a wider attenuation band than in the case of a single sound crystal, which has A single network parameter.
La simetría fractal logra que la banda de atenuación de frecuencia sea más amplia, consiguiéndose por tanto que la banda de frecuencias atenuada sea también más amplia. Es decir, se maximizan las propiedades de la reflexión múltiple de la red de centros dispersores, por las razones expuestas en los dos párrafos precedentes. Debido a lo expuesto en los párrafos anteriores, los órdenes fractales superiores (de mayor separación entre centros dispersores) podrían tener una separación muy alta. Sin embargo, se ha llegado hasta el quinto orden fractal pensando en un compromiso entre la anchura de la banda de frecuencias atenuada y la anchura resultante de la pantalla, que debería ser lo más pequeña posible. Fractal symmetry makes the frequency attenuation band wider, so that the attenuated frequency band is also wider. That is, the properties of the multiple reflection of the network of dispersing centers are maximized, for the reasons set forth in the two preceding paragraphs. Due to what has been stated in the previous paragraphs, the higher fractal orders (of greater separation between dispersing centers) could have a very high separation. However, the fifth fractal order has been reached with a compromise between the width of the attenuated frequency band and the resulting width of the screen, which should be as small as possible.
Si se pretendiese atenuar la banda de frecuen- cias que se consigue con esta disposición fractal mediante cristales de sonido, sería necesario disponer de varios cristales de sonido con distintos parámetros de red uno a continuación de otro. Sin embargo, el espacio ocupado por esta distribución superaría los requisitos de anchura máxima exigibles a una pantalla acústica. Esta es una de las ventajas que presenta la utilización de , una distribución fractal de centros dispersores. If it were intended to attenuate the frequency band that is achieved with this fractal arrangement by means of sound crystals, it would be necessary to have several sound crystals with different network parameters one after the other. However, the space occupied by this distribution would exceed the maximum width requirements required of an acoustic screen. This is one of the advantages of using a fractal distribution of dispersing centers.
Las ventajas que se obtienen con el dispositivo objeto de la invención son: atenuación en todo el rango del audible especialmente el rango de las bajas frecuen¬ cias, la obtención de un mayor nivel de atenuación en un rango de frecuencias más amplio empleando un número menor de centros dispersores. Esta última ventaja permite disminuir el coste de la pantalla y aumentar su portabi- lidad. The advantages obtained with the device object of the invention are: attenuation throughout the range the audible range especially the low fre ¬ ences, obtaining a higher level of attenuation in a range wider frequency using fewer scattering centers. This last advantage allows to reduce the cost of the screen and increase its portability.
DESCRIPCIÓN DE LOS DIBUJOS Se complementa la presente memoria descriptiva, con unos planos, ilustrativos del ejemplo preferente y nunca limitativos de la invención. DESCRIPTION OF THE DRAWINGS The present specification is complemented, with drawings, illustrative of the preferred example and never limiting of the invention.
La figura 1 es una representación esquemática en planta de un ejemplo de realización de una disposición de cilindros según una simetría fractal, denominada triángulo de Sierpinski. Figure 1 is a schematic plan representation of an embodiment of a cylinder arrangement according to a fractal symmetry, called the Sierpinski triangle.
La figura 2 es una representación de una sección en planta de una unidad fractal modificada que forma parte de la pantalla acústica objeto de la invención. Figure 2 is a representation of a plan section of a modified fractal unit that is part of the acoustic screen object of the invention.
La figura 3 es una representación en planta de un módulo de pantalla acústica formado por tres unidades fractales según el ejemplo de realización correspondiente a la figura 2. Figure 3 is a plan representation of an acoustic screen module formed by three fractal units according to the example of embodiment corresponding to Figure 2.
La figura 4 es una representación en alzado del módulo correspondiente a la figura 3. Figure 4 is an elevation representation of the module corresponding to Figure 3.
REALIZACIÓN PREFERENTE DE LA INVENCIÓN PREFERRED EMBODIMENT OF THE INVENTION
La pantalla acústica correspondiente al ejemplo de realización y representada en las figuras comprende cilindros (1.1, 1.2, 1.3, 1.4, 1.5) como centros disper- sores (1) situados sobre un zócalo (2) . Los cilindros (1.1, 1.2, 1.3, 1.4, 1.5) se distribuyen según una si- metria fractal en la que los cilindros (1.1, 1.2, 1.3, 1.4, 1.5) correspondientes a cada orden fractal presen- tan un diámetro distinto a los cilindros (1.1, 1.2, 1.3, 1.4, 1.5) correspondientes a otros órdenes fractales. El ejemplo de realización comprende cinco órdenes fractales cada uno de ellos formado por cilindros (1.1, 1.2, 1.3, 1.4, 1.5) de igual diámetro. The acoustic screen corresponding to the exemplary embodiment and shown in the figures comprises cylinders (1.1, 1.2, 1.3, 1.4, 1.5) as dispersed centers. sores (1) located on a socket (2). The cylinders (1.1, 1.2, 1.3, 1.4, 1.5) are distributed according to a fractal symmetry in which the cylinders (1.1, 1.2, 1.3, 1.4, 1.5) corresponding to each fractal order have a different diameter than cylinders (1.1, 1.2, 1.3, 1.4, 1.5) corresponding to other fractal orders. The exemplary embodiment comprises five fractal orders each formed by cylinders (1.1, 1.2, 1.3, 1.4, 1.5) of equal diameter.
En el ejemplo de realización mostrado el diámetro de los cilindros (1.1, 1.2, 1.3, 1.4, 1.5) aumenta en cada uno de los órdenes fractales. Al aumentar el diámetro de los cilindros (1.1, 1.2, 1.3, 1.4, 1.5) en cada orden fractal muchos de los cilindros (1.1, 1.2, 1.3, 1.4, 1.5) del fractal denominado triángulo de Sier- pinski han sido eliminados. De este modo los cilindros (1.1) del primer orden fractal presentan un mayor diámetro que los cilindros (1.2) del segundo orden fractal y asi sucesivamente con el resto del cilindros (1.3, 1.4, 1.5) correspondientes a los órdenes fractales tercero, cuarto y quinto. In the embodiment shown, the diameter of the cylinders (1.1, 1.2, 1.3, 1.4, 1.5) increases in each of the fractal orders. By increasing the diameter of the cylinders (1.1, 1.2, 1.3, 1.4, 1.5) in each fractal order many of the cylinders (1.1, 1.2, 1.3, 1.4, 1.5) of the fractal called Sier-pinski triangle have been eliminated. Thus the cylinders (1.1) of the first fractal order have a larger diameter than the cylinders (1.2) of the second fractal order and so on with the rest of the cylinders (1.3, 1.4, 1.5) corresponding to the third, fourth and fourth fractal orders fifth.
La distribución de los cilindros (1.1, 1.2, 1.3, 1.4, 1.5) se realiza, en el ejemplo mostrado en las figuras, según una simetría fractal denominada triángulo de Sierpinski. The distribution of the cylinders (1.1, 1.2, 1.3, 1.4, 1.5) is carried out, in the example shown in the figures, according to a fractal symmetry called the Sierpinski triangle.
Se han realizado ensayos sobre dos ordenamientos fractales, triángulo y alfombra de Sierpinski, siendo el triángulo de Sierpinski el que ha demostrado una mayor capacidad de atenuación especialmente a bajas frecuencias. La disposición triangular es también más sencilla y posee menos masa por unidad de superficie, lo que in- cide en la portabilidad del módulo de la pantalla acús- tica. Trials have been carried out on two fractal systems, Sierpinski's triangle and carpet, with the Sierpinski triangle being the one that has shown a greater capacity for attenuation, especially at low frequencies. The triangular arrangement is also simpler and has less mass per unit area, which has an impact on the portability of the module on the screen. Ethics
La pantalla acústica del ejemplo de realización está comprendida por módulos, según la figura 3, que están formados por tres unidades fractales del triángulo de Sierpinski modificado. De este modo los módulos se pueden situar uno a continuación de otro permitiendo cualquier longitud de la pantalla acústica. Se eligen tres unidades fractales para facilitar el transporte del módulo. La pantalla del ejemplo de realización podría constar de cilindros (1.1, 1.2, 1.3, 1.4, 1.5) de distintas alturas. The acoustic screen of the exemplary embodiment is comprised of modules, according to Figure 3, which are formed by three fractal units of the modified Sierpinski triangle. In this way the modules can be placed one after the other allowing any length of the acoustic screen. Three fractal units are chosen to facilitate the transport of the module. The screen of the embodiment could consist of cylinders (1.1, 1.2, 1.3, 1.4, 1.5) of different heights.
Los cilindros (1.1, 1.2, 1.3, 1.4, 1.5) están fabricados en un material reflectante al sonido, por ejemplo, hierro galvanizado, PVC, aluminio, acero, goma de neumático triturada y prensada, plexiglás, hormigón. The cylinders (1.1, 1.2, 1.3, 1.4, 1.5) are made of a sound-reflective material, for example, galvanized iron, PVC, aluminum, steel, crushed and pressed tire rubber, plexiglass, concrete.
Además del mencionado efecto de atenuación me- diante reflexión, la pantalla acústica objeto de la invención presenta atenuación del sonido mediante otros fenómenos como la resonancia y la absorción. Estos efectos acústicos se han utilizado para aumentar la potencia de atenuación del dispositivo. In addition to the aforementioned effect of attenuation through reflection, the acoustic screen object of the invention has sound attenuation by other phenomena such as resonance and absorption. These acoustic effects have been used to increase the attenuation power of the device.
La resonancia, es decir, la destrucción de ondas acústicas por rozamiento y vibración, se logra mediante el ranurado longitudinal (1.1.1, 1.2.1, 1.3.1, 1.4.1) de algunos de los cilindros que pueden ser huecos, convir- tiéndolos en resonadores Helmholtz. No todos los cilindros (1.1, 1.2, 1.3, 1.4) tienen porqué presentar el mencionado ranurado longitudinal (1.1.1, 1.2.1, 1.3.1, 1.4.1), en el ejemplo de realización mostrado en la figura 3 se disponen ranurados los cilindros (1.1, 1.2, 1.3, 1.4) de órdenes fractales primero a cuarto y los de menor tamaño (1.5) sin ranurar. Concretamente la apertura de la ranura puede estar entre 45° y 180°. The resonance, that is to say, the destruction of acoustic waves by friction and vibration, is achieved by means of the longitudinal grooving (1.1.1, 1.2.1, 1.3.1, 1.4.1) of some of the cylinders that can be hollow. - throwing them in Helmholtz resonators. Not all cylinders (1.1, 1.2, 1.3, 1.4) have to present the aforementioned longitudinal grooving (1.1.1, 1.2.1, 1.3.1, 1.4.1), in the exemplary embodiment shown in Figure 3 they are arranged slotted cylinders (1.1, 1.2, 1.3, 1.4) of fractal orders first to fourth and those of smaller size (1.5) without grooving. Specifically, the slot opening can be between 45 ° and 180 °.
Los centros dispersores (1) pueden también com- prender material absorbente acústico, como por ejemplo, lana de roca, lana de vidrio, fibras de madera o caña de azúcar, poliestireno expandido, pinturas absorbentes, enlucidos porosos con base de yeso o vermiculita o goma de neumático picada. The dispersing centers (1) may also comprise acoustic absorbent material, such as, for example, rock wool, glass wool, wood or sugar cane fibers, expanded polystyrene, absorbent paints, plaster-based porous plasters or vermiculite or chopped tire rubber.
El material absorbente puede localizarse en la cara externa del centro dispersor (1) o bien en la cara interna o en ambas y cubrir todo o en parte el mismo. El zócalo (2) de sustentación es de hormigón y los cilindros (1.1, 1.2, 1.3, 1.4, 1.5) se disponen empotrados en el mismo de modo que asi se logra que se dispongan en posición vertical. El conjunto descansaría sobre el suelo directamente sin necesidad de ningún tipo de anclaje, hecho que incide en su portabilidad. De este modo los módulos se pueden situar unos a continuación de otros configurando así una pantalla acústica de la longitud deseada. The absorbent material can be located on the outer face of the dispersing center (1) or on the inner face or both and cover all or part thereof. The support base (2) is made of concrete and the cylinders (1.1, 1.2, 1.3, 1.4, 1.5) are arranged embedded in it so that it is achieved that they are arranged in an upright position. The set would rest on the ground directly without the need for any type of anchorage, which affects its portability. In this way the modules can be placed next to each other thus configuring an acoustic screen of the desired length.

Claims

REIVINDICACIONES
1. - Pantalla acústica, que comprende centros dispersores (1) para ondas acústicas dispuestos sobre un zócalo (2) de sustentación, caracterizado porque los centros dispersores (1) se distribuyen sobre el zócalo (2) según una simetría fractal modificada en la que los centros dispersores (1) pertenecientes a cada uno de los órdenes fractales poseen una sección de distinto tamaño a la del resto de órdenes fractales. 1. - Acoustic screen, comprising dispersing centers (1) for acoustic waves arranged on a support base (2), characterized in that the dispersing centers (1) are distributed on the base (2) according to a modified fractal symmetry in which The dispersing centers (1) belonging to each of the fractal orders have a section of different size from the rest of the fractal orders.
2. - Pantalla acústica, según la reivindicación 1, caracterizada porque los centros dispersores (1) de un orden fractal superior poseen una sección mayor que los de un orden fractal inferior. 2. - Acoustic screen according to claim 1, characterized in that the dispersing centers (1) of a higher fractal order have a larger section than those of a lower fractal order.
3. - Pantalla acústica, según cualquiera de las reivindicaciones anteriores, caracterizada porque la distribución de los centros dispersores (1) se realiza según una simetría fractal denominada triángulo de Sierpinski. 3. - Acoustic screen, according to any of the preceding claims, characterized in that the distribution of the dispersing centers (1) is carried out according to a fractal symmetry called Sierpinski's triangle.
4. - Pantalla acústica, según la reivindicación 3, caracterizada porque está comprendida por módulos que están formados por tres unidades fractales del triángulo de Sierpinski modificado que se disponen a continuación unos de otros. 4. - Acoustic screen according to claim 3, characterized in that it is comprised of modules that are formed by three fractal units of the modified Sierpinski triangle which are then arranged from each other.
5. - Pantalla acústica, según las reivindicaciones 1 6 2, caracterizada porque la distribución de los centros dis- persores (1) se realiza según una simetría fractal denominada alfombra de Sierpinski. 5. - Acoustic screen according to claims 1 6 2, characterized in that the distribution of the dispersing centers (1) is carried out according to a fractal symmetry called Sierpinski carpet.
6. - Pantalla acústica, según, cualquiera de las reivindicaciones anteriores, caracterizada porque los centros dispersores (1) son cilindros (1.1, 1.2, 1.3, 1.4, 1.5). 6. - Acoustic screen, according to any of the preceding claims, characterized in that the dispersing centers (1) are cylinders (1.1, 1.2, 1.3, 1.4, 1.5).
7. - Pantalla acústica, según cualquiera de las reivindicaciones anteriores, caracterizada porque comprende cinco órdenes fractales. 7. - Acoustic screen, according to any of the preceding claims, characterized in that it comprises five fractal orders.
8. - Pantalla acústica, según cualquiera de las reivindicaciones anteriores, caracterizada porque los centros dispersores (1) son huecos y comprenden un ranurado longitudinal {1.1.1, 1.2.1, 1.3.1, 1.4.1) de modo que atenúan las ondas sonoras por resonancia, 8. - Acoustic screen, according to any of the preceding claims, characterized in that the dispersing centers (1) are hollow and comprise a longitudinal groove {1.1.1, 1.2.1, 1.3.1, 1.4.1) so as to attenuate the resonance sound waves,
9. - Pantalla acústica, según cualquiera de las reivindicaciones anteriores, caracterizada porque los centros dispersores (1) comprenden material absorbente acústico. 9. - Acoustic screen, according to any of the preceding claims, characterized in that the dispersing centers (1) comprise acoustic absorbent material.
10. - Pantalla acústica, según la reivindicación 9, caracterizada porque el material absorbente acústico se dispone en la cara externa del centros dispersor (1) o en la cara interna o en ambas. 10. - Acoustic screen according to claim 9, characterized in that the acoustic absorbent material is disposed on the outer face of the dispersing centers (1) or on the inner face or both.
PCT/IB2010/002719 2009-10-23 2010-10-25 Acoustic shield WO2011048484A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200902074A ES2358143B1 (en) 2009-10-23 2009-10-23 ACOUSTIC SCREEN.
ES200902074 2009-10-23

Publications (1)

Publication Number Publication Date
WO2011048484A1 true WO2011048484A1 (en) 2011-04-28

Family

ID=43880327

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2010/002719 WO2011048484A1 (en) 2009-10-23 2010-10-25 Acoustic shield

Country Status (2)

Country Link
ES (1) ES2358143B1 (en)
WO (1) WO2011048484A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3017235A1 (en) * 2014-02-04 2015-08-07 Onera (Off Nat Aerospatiale) SOUNDPROOF PANEL
US9765516B2 (en) 2013-11-18 2017-09-19 Philips Lighting Holding B.V. Acoustically absorbing room divider

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2517215B2 (en) * 2014-06-25 2015-02-18 Universitat Politècnica De València Acoustic screen
CN113699907A (en) * 2021-09-22 2021-11-26 同济大学 Two-dimensional phonon crystal type sound barrier with energy supply

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5027920A (en) * 1989-11-06 1991-07-02 Rpg Diffusor Systems, Inc. Cinder block modular diffusor
ES2190904A1 (en) * 2002-02-13 2003-08-16 Univ Valencia Politecnica Acoustic screen.
US20050103568A1 (en) * 2002-03-19 2005-05-19 Bernard Sapoval Noise abatement wall

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6772859B2 (en) * 2002-09-26 2004-08-10 Rpg Diffusor Systems, Inc. Embodiments of aperiodic tiling of a single asymmetric diffusive base shape

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5027920A (en) * 1989-11-06 1991-07-02 Rpg Diffusor Systems, Inc. Cinder block modular diffusor
ES2190904A1 (en) * 2002-02-13 2003-08-16 Univ Valencia Politecnica Acoustic screen.
US20050103568A1 (en) * 2002-03-19 2005-05-19 Bernard Sapoval Noise abatement wall

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 200370, Derwent World Patents Index; AN 2003-733748, RETRIEVED *
DATABASE WPI Week 200426, Derwent World Patents Index; AN 2004-282181, RETRIEVED *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9765516B2 (en) 2013-11-18 2017-09-19 Philips Lighting Holding B.V. Acoustically absorbing room divider
FR3017235A1 (en) * 2014-02-04 2015-08-07 Onera (Off Nat Aerospatiale) SOUNDPROOF PANEL
WO2015117868A1 (en) * 2014-02-04 2015-08-13 ONERA (Office National d'Etudes et de Recherches Aérospatiales) Soundproof panel
US9640166B2 (en) 2014-02-04 2017-05-02 Onera (Office National D'etudes Et De Recherches Aerospatiales) Soundproof panel

Also Published As

Publication number Publication date
ES2358143B1 (en) 2012-03-26
ES2358143A1 (en) 2011-05-06

Similar Documents

Publication Publication Date Title
US8789652B2 (en) Attenuators, arrangements of attenuators, acoustic barriers and methods for constructing acoustic barriers
WO2011048484A1 (en) Acoustic shield
EP1571649A2 (en) Sound attenuating structures
ES1275530U (en) Acoustically insulating panel
KR100468296B1 (en) Panel for soundproofing and plate with numerous holes for the panel
RU2344490C1 (en) Sound-absorbing structure
US8132644B2 (en) Method and apparatus for the reduction of sound
ES2680844T3 (en) Sound proof public service, in particular a sound attenuation unit
CN108396668A (en) Denoising structure at the top of the anti-diffraction sound barrier of low frequency
US20120125711A1 (en) Sound absorbing panel and system
RU2282004C1 (en) Cylindrical acoustic absorbing member
RU2151839C1 (en) Roadside noise shield (versions)
CN106416882B (en) Noise reduction green belt adopting phononic crystal structure
KR101574295B1 (en) The gabion type soundproof panel and method for constructing soundproof structure using this same
KR200480057Y1 (en) Using micro-perforated plate and the soundproofing
RU2646251C1 (en) Acoustic screen
RU2648087C1 (en) Acoustic screen
RU2415824C2 (en) Sound absorbing light concrete
LT5270B (en) Double partition construction with sound insulation
RU2579022C2 (en) Kochetov(s acoustic screen
CN217053110U (en) Sound barrier with non-uniform sound absorber
KR101542483B1 (en) Transparent Sound Proofing Wall with Variable Sound Absorption Structure
RU2466885C1 (en) Acoustic and vibration isolating device
KR102635232B1 (en) Transparent soundproof panel with improved sound absorption
TWI818224B (en) Noise reduction module

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10824535

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 10824535

Country of ref document: EP

Kind code of ref document: A1