EP3384486B1 - Reflective acoustic metamaterial - Google Patents
Reflective acoustic metamaterial Download PDFInfo
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- EP3384486B1 EP3384486B1 EP16819152.6A EP16819152A EP3384486B1 EP 3384486 B1 EP3384486 B1 EP 3384486B1 EP 16819152 A EP16819152 A EP 16819152A EP 3384486 B1 EP3384486 B1 EP 3384486B1
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- cavity
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- fabry
- acoustic
- elementary
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Classifications
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- 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
- G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
- G10K11/04—Acoustic filters ; Acoustic resonators
-
- 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
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
-
- 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
- G10K11/162—Selection of materials
- G10K11/168—Plural layers of different materials, e.g. sandwiches
-
- 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
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/321—Physical
- G10K2210/3227—Resonators
Definitions
- Noise pollution in everyday life for example from the external environment, such as the proximity of a road or air axis, or interior such as the noise of household appliances, are stress factors which deteriorate the comfort of life.
- the invention also relates to an acoustic screen in the form of a panel, comprising at least one elementary cell according to the invention.
- a screen can only comprise elementary reflecting cells according to the invention, but it can also include other acoustic elements, for example absorbing acoustic cells.
- plane of the panel is meant in the sense of the present application the surface of the panel which may be flat or curved.
- the parallelepipedal shape of the elementary cell 100 has the advantage of allowing better filling of the surface of an acoustic panel.
- the invention also relates to an acoustic screen comprising one or more elementary cells in accordance with the invention and as described above.
- Pressure measurements are performed using two terminations with different impedance conditions.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Description
L'invention concerne le domaine des isolants acoustiques. En particulier, l'invention porte sur une cellule élémentaire d'un métamatériau acoustique, et un écran acoustique comprenant une telle cellule.The invention relates to the field of acoustic insulation. In particular, the invention relates to an elementary cell of an acoustic metamaterial, and an acoustic screen comprising such a cell.
Les nuisances sonores dans la vie quotidienne, provenant par exemple de l'environnement extérieur, comme la proximité d'un axe routier ou aérien, ou bien intérieur comme le bruit des appareils ménagers, sont des facteurs de stress qui détériorent le confort de vie.Noise pollution in everyday life, for example from the external environment, such as the proximity of a road or air axis, or interior such as the noise of household appliances, are stress factors which deteriorate the comfort of life.
Les nuisances sonores existent également dans le domaine du bâtiment et dans divers domaines industriels.Noise pollution also exists in the building sector and in various industrial fields.
Afin de retrouver le confort, il est souvent nécessaire d'isoler acoustiquement la source de bruit. Pour ce faire, des solutions permettant d'atténuer la propagation des ondes sonores existent. Cependant, les isolants acoustiques connus de l'état de la technique reposent sur l'utilisation de caractéristiques intrinsèques de matériaux en termes d'absorption ou de réflexion d'ondes sonores. Les matériaux classiquement utilisés à cette fin sont typiquement des matériaux poreux, telles que des mousses métalliques ou des matériaux polymères, la laine de roche, de verre, de coton, de liège ou de fibres de bois agglomérées.In order to regain comfort, it is often necessary to acoustically isolate the noise source. To do this, solutions for attenuating the propagation of sound waves exist. However, the acoustic insulators known from the state of the art are based on the use of intrinsic characteristics of materials in terms of absorption or reflection of sound waves. The materials conventionally used for this purpose are typically porous materials, such as metallic foams or polymer materials, rock wool, glass wool, cotton wool, cork or agglomerated wood fibers.
Un problème que pose l'utilisation de tels matériaux réside dans le fait que le choix du matériau à utiliser est dicté par les caractéristiques intrinsèques du matériau, ce qui limite la possibilité de choix du matériau par rapport à une application donnée. De plus, le fait de se baser sur les propriétés intrinsèques du matériau limite également la gamme de fréquences de réponse du matériau, ainsi que les techniques de fabrication.A problem with the use of such materials resides in the fact that the choice of the material to be used is dictated by the intrinsic characteristics of the material, which limits the possibility of choosing the material with respect to a given application. In addition, relying on the intrinsic properties of the material also limits the frequency range of material response, as well as manufacturing techniques.
En outre, les panneaux acoustiques fabriqués à partir de tels matériaux sont lourds et volumineux, notamment ceux utilisé pour les basses fréquences.In addition, acoustic panels made from such materials are heavy and bulky, especially those used for low frequencies.
Le document de l'art antérieur XP012202298 divulgue un métamatériau acoustique constitué par des cellules élémentaires comprenant chacune un canal qui traverse un corps solide, formant une cavité de type Fabry-Pérot, et une cavité résonante latérale de type Helmholtz en communication avec ladite cavité de type Fabry-Pérot.The document of the prior art XP012202298 discloses an acoustic metamaterial consisting of elementary cells each comprising a channel which passes through a solid body, forming a Fabry-Perot type cavity, and a lateral Helmholtz type resonant cavity in communication with said cavity of Fabry-Pérot type.
L'objectif de la présente invention est de résoudre les problèmes des isolants acoustiques connus de l'état de la technique. En particulier, l'invention a pour objectif de proposer une solution d'isolation acoustique, efficace et permettant d'avoir une flexibilité dans le choix du matériau et la gamme de fréquences.The objective of the present invention is to solve the problems of sound insulators known from the state of the art. In particular, the object of the invention is to provide an acoustic insulation solution that is efficient and allows flexibility in the choice of material and the range of frequencies.
L'invention vise également à réduire la dimension et le poids des panneaux acoustiques.The invention also aims to reduce the size and weight of acoustic panels.
À cet effet, l'invention a pour objet une cellule élémentaire de métamatériau acoustique comprenant :
- un corps en matériau solide,
- au moins une cavité, de type Fabry-Pérot dans ledit corps, et
- au moins une cavité résonante latérale communicant avec ladite cavité de type Fabry-Pérot.
- a body made of solid material,
- at least one cavity, of the Fabry-Pérot type in said body, and
- at least one lateral resonant cavity communicating with said Fabry-Pérot type cavity.
Par cavité de type Fabry-Pérot on entend une cavité ayant deux extrémités ouvertes. Une telle cavité permet un confinement élevé de l'énergie acoustique. Cette cavité étant couplée à une ou plusieurs cavité (s) résonante (s) latérale(s), une série d'antirésonances/résonances remplacent les résonances classiques des cavités de type Fabry-Pérot simples, induisant un effet accru de réflexion des ondes sonores. La cavité de type Fabry-Pérot est un conduit traversant ledit corps et la cavité résonante latérale est un résonateur acoustique de type Helmholtz qui est une cavité cylindrique concentrique avec le conduit traversant et communiquant avec ledit conduit par un cou. Un tel effet est obtenu indépendamment de la nature du matériau solide, ce qui permet donc de s'affranchir de la nature du matériau.By Fabry-Pérot type cavity is meant a cavity having two open ends. Such a cavity allows high confinement of the acoustic energy. This cavity being coupled to one or more lateral resonant cavity (s), a series of antiresonances / resonances replace the conventional resonances of single Fabry-Perot type cavities, inducing an increased reflection effect of sound waves. . The Fabry-Pérot type cavity is a duct passing through said body and the lateral resonant cavity is a Helmholtz type acoustic resonator which is a cylindrical cavity concentric with the through duct and communicating with said duct via a neck. Such an effect is obtained independently of the nature of the solid material, which therefore makes it possible to to free oneself from the nature of the material.
En d'autres termes, même en utilisant un matériau solide dont les propriétés de réflexion intrinsèques ne sont pas importantes, le fait de le structurer de manière à avoir un métamatériau comprenant une cavité de type Fabry-Pérot couplée à une ou plusieurs cavité(s) résonante(s) latérale(s) permet d'améliorer considérablement la réflexion d'ondes sonores par ce matériau.In other words, even using a solid material whose intrinsic reflective properties do not are not important, the fact of structuring it so as to have a metamaterial comprising a Fabry-Pérot type cavity coupled to one or more lateral resonant cavity (s) considerably improves the wave reflection sound by this material.
Pour avoir une réflexion importante, il est préférable que les dimensions de l'ouverture de la cavité de type Fabry-Pérot, par exemple le diamètre d'une cavité cylindrique, soient inférieures à la longueur d'onde ou à la gamme de longueurs d'ondes que l'on souhaite réfléchir.In order to have a significant reflection, it is preferable that the dimensions of the opening of the Fabry-Pérot type cavity, for example the diameter of a cylindrical cavity, are less than the wavelength or the range of lengths d waves that we want to reflect.
La cavité résonante latérale peut avoir une forme quelconque, la seule condition pour avoir une réflexion d'ondes sonores et que la cavité résonnante latérale communique avec la cavité de type Fabry-Pérot.
La cavité de type Fabry-Pérot permet de générer une transmission dont le profil peut être approximé par :
La résonance s'opère à la fréquence de
Ce qui donne :
The Fabry-Pérot type cavity makes it possible to generate a transmission whose profile can be approximated by:
Resonance takes place at the frequency of
Which give :
La cavité de type Fabry-Pérot est un conduit traversant ledit corps en matériau solide, qui est de préférence cylindrique. L'avantage d'avoir un conduit traversant réside dans le fait qu'il permet la circulation de l'air et favorise les échanges thermiques entre les deux milieux que la cellule élémentaire sépare.The Fabry-Pérot type cavity is a duct passing through said body of solid material, which is preferably cylindrical. The advantage of having a through duct lies in the fact that it allows air to circulate and promotes heat exchange between the two media that the elementary cell separates.
De préférence le conduit cylindrique a une section circulaire avec un diamètre inférieur aux longueurs d'ondes à réfléchir. Ceci permet d'avoir un haut confinement d'énergie.Preferably the cylindrical duct has a circular section with a diameter smaller than the wavelengths to be reflected. This makes it possible to have a high energy confinement.
Avantageusement, le corps de cellule est parallélépipédique ou cylindrique. Une telle forme est avantageuse, car elle permet d'inclure aisément la cellule dans une matrice, par exemple dans une matrice d'un panneau absorbant ou bien un panneau comprenant d'autres éléments acoustiques.Advantageously, the cell body is parallelepipedal or cylindrical. Such a form is advantageous, because it makes it possible to easily include the cell in a matrix, for example in a matrix of a absorbent panel or else a panel comprising other acoustic elements.
Avantageusement, le conduit traversant est coaxial avec la cellule cylindrique.Advantageously, the through duct is coaxial with the cylindrical cell.
Avantageusement, le résonateur d'Helmholtz est une cavité cylindrique concentrique avec le conduit traversant et communiquant avec ledit conduit traversant par un cou. Cette configuration favorise l'interaction entre la cavité de type Fabry-Pérot et la cavité latérale pour réaliser la fonction de réflecteur. La réflexion est notamment favorisée par la présence du cou reliant les deux cavités.Advantageously, the Helmholtz resonator is a cylindrical cavity concentric with the duct passing through and communicating with said duct passing through by a neck. This configuration promotes the interaction between the Fabry-Pérot type cavity and the lateral cavity to perform the function of reflector. Reflection is particularly favored by the presence of the neck connecting the two cavities.
Avantageusement, le corps en matériau solide comporte deux résonateurs d'Helmholtz ou plus, ayant des dimensions différentes. Le fait d'avoir plusieurs résonateurs d'Helmholtz avec des dimensions différentes permet d'augmenter la bande de fréquences dans laquelle la cellule est réflectrice, à travers des couplages intervenant à différentes fréquences. En effet, comme les résonateurs ont des dimensions différentes, chacun a une fréquence de résonance différente. De ce fait, le couplage de tels résonateurs d'Helmholtz permet d'élargir la bande de fréquences dans laquelle la cellule est réflectrice.Advantageously, the body of solid material comprises two or more Helmholtz resonators, having different dimensions. Having several Helmholtz resonators with different dimensions makes it possible to increase the frequency band in which the cell is reflective, through couplings occurring at different frequencies. Indeed, as the resonators have different dimensions, each one has a different resonant frequency. As a result, the coupling of such Helmholtz resonators makes it possible to widen the frequency band in which the cell is reflective.
Selon un mode de réalisation de l'invention, la cavité Fabry-Pérot et/ou la cavité résonante latérale est (sont) repliée(s) de manière à présenter au moins une entrée, au moins une sortie et au moins deux plis.According to one embodiment of the invention, the Fabry-Pérot cavity and / or the lateral resonant cavity is (are) folded up so as to present at least one inlet, at least one outlet and at least two folds.
Ces replies sont réalisés par une technique appelée, technique de repliement de l'espace, qui permet de réduire l'épaisseur de la cellule. Ainsi, grâce à ce repliement il est possible de fabriquer des cellules acoustiques conformes à l'invention, de faible épaisseur.These folds are made by a technique called, space folding technique, which reduces the thickness of the cell. Thus, thanks to this folding it is possible to manufacture acoustic cells according to the invention, of low thickness.
L'invention porte également sur un écran acoustique sous la forme d'un panneau, comprenant au moins une cellule élémentaire selon l'invention. Un tel écran peut comprendre uniquement des cellules élémentaires réflectrices selon l'invention, mais il peut également comprendre d'autres éléments acoustiques, par exemple des cellules acoustiques absorbantes.The invention also relates to an acoustic screen in the form of a panel, comprising at least one elementary cell according to the invention. Such a screen can only comprise elementary reflecting cells according to the invention, but it can also include other acoustic elements, for example absorbing acoustic cells.
Avantageusement, ledit écran acoustique comprend une multitude de cellules élémentaires, lesdites cellules étant agencées dans un plan du panneau de sorte que chaque cellule soit apte à agir sur une autre cellule voisine pour élargir la bande de fréquence de réflexion.Advantageously, said acoustic screen comprises a multitude of elementary cells, said cells being arranged in a plane of the panel so that each cell is able to act on another neighboring cell to widen the reflection frequency band.
Dans cette configuration, le fait d'augmenter le nombre de cellules par unité de surface, permet d'augmenter la réflexion des ondes sonores.In this configuration, the fact of increasing the number of cells per unit area makes it possible to increase the reflection of sound waves.
Par plan du panneau on entend dans le sens de la présente demande la surface du panneau qui peut être plate ou courbée.By plane of the panel is meant in the sense of the present application the surface of the panel which may be flat or curved.
Avantageusement, lesdites cellules élémentaires sont agencées dans ledit plan du panneau de manière périodique, par exemple selon un réseau particulier de type triangulaire, carré, hexagonal, ou en forme de nid d'abeille.Advantageously, said elementary cells are arranged in said plane of the panel periodically, for example according to a particular network of triangular, square, hexagonal, or honeycomb-shaped type.
L'invention sera mieux comprise à la lecture de la description suivante de modes de réalisation préférés donnés à titre d'exemples illustratifs, non limitatifs, en référence aux dessins parmi lesquels :
- Les figures la à 1c représentent un premier exemple de réalisation d'une cellule élémentaire selon l'invention, comprenant une cavité de type Fabry-Pérot et une cavité latérale ;
- Les
figures 2a et 2b représentent des vues de coupes de deux autre exemples dans lesquels la cellule comprend une seule cavité latérale ; - La
figure 3 représente un exemple de réalisation dans lequel la cellule élémentaire comprend en plus de la cavité de type Fabry-Pérot, trois cavités latérales ; - Les
figures 4a à 4c représentent un premier exemple de réalisation dans lequel la cavité latérale est repliée ; - Les
figures 5a à 5d représente un deuxième exemple de réalisation dans lequel la cavité de type Fabry-Pérot est repliée ; - La
figure 6 montre la réponse en transmission d'une cellule élémentaire conforme à l'invention.
- Figures la to 1c show a first embodiment of an elementary cell according to the invention, comprising a Fabry-Perot type cavity and a lateral cavity;
- The
figures 2a and 2b represent sectional views of two other examples in which the cell comprises a single lateral cavity; - The
figure 3 represents an exemplary embodiment in which the elementary cell comprises, in addition to the Fabry-Perot type cavity, three lateral cavities; - The
figures 4a to 4c show a first embodiment in which the lateral cavity is folded back; - The
figures 5a to 5d shows a second embodiment in which the Fabry-Pérot type cavity is folded; - The
figure 6 shows the transmission response of an elementary cell in accordance with the invention.
La figure la représente une vue isométrique d'une cellule élémentaire 1 de métamatériau acoustique conforme à l'invention. Les
La cellule 1 comporte un corps solide 2 cylindrique comprenant un conduit cylindrique 3 coaxial et traversant, formant une cavité de type Fabry-Pérot. La
Par mi-hauteur on entend, une distance située au milieu entre les deux extrémités du conduit traversant formant la cavité de Fabry-Pérot.By mid-height is meant a distance located in the middle between the two ends of the through duct forming the Fabry-Pérot cavity.
Une telle structuration de la cellule de métamatériau 1, notamment grâce à la présence du cou 5 qui relie les deux cavités, favorise l'interaction entre la cavité de type Fabry-Pérot et la cavité latérale pour réaliser une fonction de réflecteur.Such a structuring of the
Le cou 5 peut toutefois être remplacé par une ouverture d'un autre type entre la cavité traversante 3 et la cavité latérale 4.The
Les
Dans l'exemple de la
Dans l'exemple de réalisation illustré sur la
En modifiant les dimensions de la cavité latérale, on modifie sa fréquence de résonance et son facteur de qualité. De cette manière on peut ajuster la fréquence de réflexion.By modifying the dimensions of the lateral cavity, its resonant frequency and its factor of quality. In this way, the frequency of reflection can be adjusted.
Le mode de réalisation de la
Les trois cavités 41, 42, 43 comme elles ont des formes et/ou dimensions différentes, leurs fréquences de résonance sont également différentes. De ce fait, la bande de fréquences de réflexion de la cellule élémentaire 10 est plus importante que celle de la cellule élémentaire 1, qui comprend une seule cavité latérale 4 comme représenté dans la
Les
La
Le repliement de la cavité latérale 400 permet de réduire considérablement l'épaisseur de la cellule 100, tout en gardant l'efficacité réflexion.The folding of the
La
La
La forme parallélépipédique de la cellule élémentaire 100' présente l'avantage de permettre un meilleur remplissage de la surface d'un panneau acoustique.The parallelepipedal shape of the elementary cell 100 'has the advantage of allowing better filling of the surface of an acoustic panel.
Selon une variante, la cavité de type Fabry-Pérot et la cavité latérale sont repliées.According to one variant, the Fabry-Pérot type cavity and the lateral cavity are folded over.
L'invention concerne également un écran acoustique comprenant une ou plusieurs cellules élémentaires conforme(s)à l'invention et telle(s) que décrite(s) ci-dessus.The invention also relates to an acoustic screen comprising one or more elementary cells in accordance with the invention and as described above.
La
Ladite cellule a été fabriquée par l'imprimante 3D Projet SD3500, dont les caractéristiques de la résine Visijet Crystal utilisée sont présentées ci-dessous :
- Densité (g/cm) : 1.02 (liquide, à 80°)
- Module d'Young : 1463 MPa
- Contrainte-flexion : 49 MPa
- Density (g / cm): 1.02 (liquid, at 80 °)
- Young's modulus: 1463 MPa
- Bending stress: 49 MPa
La caractérisation présentée et qui permet d'étudier les propriétés acoustiques de ladite cellule pour les fréquences audibles, est obtenue grâce à un tube à ondes stationnaire muni de 4 microphones. Nous avons utilisé un kit de tube de transmission de type 4206-T de la marque Brüel&Kjær.The characterization presented and which makes it possible to study the acoustic properties of said cell for the audible frequencies, is obtained by means of a standing wave tube provided with 4 microphones. We used a 4206-T type transmission tube kit from Brüel & Kjær.
Le diamètre de tube de transmission utilisé est de 29 mm, ce qui permet de réaliser des mesures pour l'intervalle de fréquences de [500 :6400]-Hz.The diameter of the transmission tube used is 29 mm, which allows measurements to be made for the frequency interval of [500: 6400] -Hz.
Un haut-parleur, placé à une extrémité du tube, génère du bruit blanc sur la bande fréquentielle qui nous intéresse.A loudspeaker, placed at one end of the tube, generates white noise on the frequency band that interests us.
Les mesures en pression sont réalisées en utilisant deux terminaisons à condition d'impédance différente.Pressure measurements are performed using two terminations with different impedance conditions.
Comme le montre le spectre de transmission présenté en
Ce résultat représente une amélioration de 15 à 20 dB par rapport à la réflexion d'une cellule simplement munie d'une cavité de type Fabry-Pérot, et ce pour une fréquence allant de 1 à 5 kHz.This result represents an improvement of 15 to 20 dB compared to the reflection of a cell simply provided with a Fabry-Pérot type cavity, and this for a frequency ranging from 1 to 5 kHz.
Dans la description ci-dessous, nous désignons le corps en matériau solide indifféremment par corps en matériau solide, corps solide, corps de cellule ou simplement corps.In the description below, we denote the body of solid material indifferently by body of solid material, solid body, cell body or simply body.
Claims (8)
- Elementary cell (1; 1'; 1"; 10; 100; 100') made of acoustic metamaterial, comprising:- a body made of solid material (2; 2'; 2"; 20; 200; 200'),- at least one Fabry-Perot cavity (3; 3'; 3"; 30; 300; 300') in said body (2; 2'; 2"; 20; 200; 200'), and- at least one lateral resonant cavity (4; 4'; 4"; 41, 42, 43; 400; 400'), which is a Helmholtz acoustic resonator, and communicates with said Fabry-Perot cavity (3; 3'; 3"; 30; 300; 300'),characterized in that the Fabry-Perot cavity (3; 3'; 3"; 30; 300; 300') is a channel which passes through said body (2; 2'; 2"; 20; 200; 200'),
and in that the Helmholtz resonator is a cylindrical cavity (4; 4'; 4"; 41, 42, 43; 400; 400') which is concentric with the through-channel (3; 3'; 3"; 30; 300; 300') and communicates with said channel (3; 3'; 3"; 30; 300; 300') via a neck (5; 5'; 5"; 50; 500; 500'). - Cell (1; 1'; 1"; 10; 100; 100') according to claim 1, wherein the through-channel (3; 3'; 3"; 30; 300; 300') is cylindrical.
- Cell (1; 1'; 1"; 10; 100; 100') according to either claim 1 or claim 2, wherein the cell body (2; 2'; 2"; 20; 200; 200') is parallelepiped or cylindrical.
- Cell (10) according to any of claims 1 to 3, wherein the body made of solid material (20) comprises two or more Helmholtz resonators (41, 42, 43) having different dimensions.
- Cell (100; 100') according to any of claims 1 to 4, wherein the Fabry-Perot cavity (300') and/or the lateral resonant cavity (400) is/are folded so as to have at least one inlet, at least one outlet and at least two folds.
- Acoustic screen in the form of a panel comprising at least one elementary cell (1; 1'; 1"; 10; 100; 100') according to any of claims 1 to 5.
- Acoustic screen according to claim 6, comprising a plurality of elementary cells (1; 1'; 1"; 10; 100; 100'), said cells being arranged in a plane of the panel such that each elementary cell (1; 1'; 1"; 10; 100; 100') is capable of acting on another adjacent elementary cell (1; 1'; 1"; 10; 100; 100') in order to widen the reflection frequency band.
- Acoustic screen according to claim 7, wherein the elementary cells (1; 1'; 1"; 10; 100; 100') are arranged in said plane of the panel at regular intervals.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1561750A FR3044813B1 (en) | 2015-12-02 | 2015-12-02 | REFLECTOR ACOUSTIC METAMATERIAL |
PCT/FR2016/053187 WO2017093690A1 (en) | 2015-12-02 | 2016-12-02 | Reflective acoustic metamaterial |
Publications (2)
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EP3384486A1 EP3384486A1 (en) | 2018-10-10 |
EP3384486B1 true EP3384486B1 (en) | 2021-07-28 |
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EP16819152.6A Active EP3384486B1 (en) | 2015-12-02 | 2016-12-02 | Reflective acoustic metamaterial |
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EP (1) | EP3384486B1 (en) |
ES (1) | ES2894800T3 (en) |
FR (1) | FR3044813B1 (en) |
WO (1) | WO2017093690A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN114339535A (en) * | 2021-12-22 | 2022-04-12 | 南京大学 | Acoustic metamaterial filter |
Families Citing this family (8)
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KR101825480B1 (en) * | 2016-04-29 | 2018-03-23 | 서울대학교산학협력단 | Meta atom controlling acoustic parameters and metamaterials comprising the same |
US10873812B2 (en) | 2017-02-09 | 2020-12-22 | The University Of Sussex | Acoustic wave manipulation by means of a time delay array |
SE544189C2 (en) * | 2018-02-13 | 2022-02-22 | Faurecia Creo Ab | Acoustic damper for a gas duct system |
CN110895923B (en) * | 2018-09-13 | 2022-03-18 | 南京大学 | Sub-wavelength broadband metamaterial absorber for controlling low-frequency noise |
GB201905258D0 (en) * | 2019-04-12 | 2019-05-29 | Univ Of Sussex | acoustic metamaterial systems |
CN110609086B (en) * | 2019-09-24 | 2022-08-09 | 哈尔滨工程大学 | Experimental device for super material plate structure of acoustics |
CN113281402B (en) * | 2021-04-12 | 2024-03-12 | 西安理工大学 | Generalized magnetoelectric effect measuring probe and measuring method based on F-P |
IL315187A (en) * | 2022-03-01 | 2024-10-01 | Metadyna M?Hend?Sl?K Sanay? Ve T?Caret Anon?M ??Rket? | Meta cells and an acoustic metamaterial panel comprising at least one acoustic meta cell |
-
2015
- 2015-12-02 FR FR1561750A patent/FR3044813B1/en active Active
-
2016
- 2016-12-02 EP EP16819152.6A patent/EP3384486B1/en active Active
- 2016-12-02 ES ES16819152T patent/ES2894800T3/en active Active
- 2016-12-02 WO PCT/FR2016/053187 patent/WO2017093690A1/en active Application Filing
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN114339535A (en) * | 2021-12-22 | 2022-04-12 | 南京大学 | Acoustic metamaterial filter |
Also Published As
Publication number | Publication date |
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WO2017093690A1 (en) | 2017-06-08 |
FR3044813A1 (en) | 2017-06-09 |
ES2894800T3 (en) | 2022-02-15 |
FR3044813B1 (en) | 2018-11-02 |
EP3384486A1 (en) | 2018-10-10 |
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