EP3039672B1 - Akustikplatte - Google Patents

Akustikplatte Download PDF

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Publication number
EP3039672B1
EP3039672B1 EP14786988.7A EP14786988A EP3039672B1 EP 3039672 B1 EP3039672 B1 EP 3039672B1 EP 14786988 A EP14786988 A EP 14786988A EP 3039672 B1 EP3039672 B1 EP 3039672B1
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EP
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Prior art keywords
resonators
resonator
face
cell
cavity
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English (en)
French (fr)
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EP3039672A1 (de
Inventor
Clément LAGARRIGUE
Jean-Philippe GROBY
Vincent Tournat
Olivier DAZEL
Benoît NENNIG
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SUPMECA
Centre National de la Recherche Scientifique CNRS
Le Mans Universite
Original Assignee
Supmeca
Centre National de la Recherche Scientifique CNRS
Universite du Maine
University of Maine System
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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
    • G10K11/16—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

Definitions

  • the present invention relates to an absorbent acoustic cell as well as an absorbent acoustic panel comprising a plurality of cells.
  • the materials used for sound absorption are mostly materials with a porous matrix such as so-called porous materials (polyurethane foam, etc.) or so-called fibrous materials (glass wool, palm fiber ,).
  • porous materials polyurethane foam, etc.
  • fibrous materials glass wool, palm fiber ,
  • these materials do not allow good attenuation of very low frequency sounds, that is to say for frequencies of the order of 50 Hz to 1000 Hz for panels of thin thickness of thickness of the order 5 to 10 cm, corresponding for example to the noise emitted by an idling engine. This is especially true for frequencies whose corresponding wavelength is greater than four times the thickness of the material.
  • the solution commonly adopted consists in increasing the thickness and the mass of the porous matrix by combining layers of different porous materials.
  • the main drawback lies in the greater bulk and mass of the acoustic panel.
  • these structures make it possible to attenuate the acoustic energy by viscous and thermal losses.
  • the resonators integrated into the porous matrix act as diffusers, returning the incident acoustic wave in all directions. Part of the acoustic energy is also absorbed due to the resonance of the resonators at their resonant frequency as a function of the dimensional characteristics of the resonator.
  • the document EP 0 926 656 A1 discloses a sound-absorbing structure comprising a body of porous material absorbing acoustic energy.
  • the structure comprises at least one tubular element defining a cavity, said element being embedded in the middle of the mass of absorbent material and pierced with several holes regularly arranged on the wall of said element, each hole forming a resonator neck.
  • the object of the invention is in particular to provide a simple, effective and economical solution to these problems.
  • the invention thus proposes a particular arrangement of acoustic resonators inside a porous matrix.
  • the integration in the cell of at least two resonators arranged one behind the other in a direction perpendicular to the first and second faces of the cell makes it possible to achieve very good absorption of low-frequency sounds both by absorption of acoustic waves at the resonant frequencies of the resonators and by scattering of the incident acoustic waves in all directions on the external surface of each resonator due to the use of two rows of resonators increasing the rate of reflection and consequently the absorption coefficient of the cell.
  • the porous material is of the type with so-called open pores, that is to say that when the material is filled with air, the air can circulate between the pores.
  • the dimensional parameters of the resonators are determined so that the resonators are all different in pairs.
  • the distances separating two resonators are all different in pairs. This particular arrangement of the resonators makes it possible to increase the destructive interference between two given resonators, which increases the absorption coefficient of the cell.
  • the first face comprises a layer of a rigid material having for example a Young's modulus of at least 20 GPa.
  • the layer of rigid material forms a wall of the cell beyond which the incident acoustic waves are not transmitted.
  • This rigid layer can be used for attachment to a support intended for fixing the cell to an acoustic panel.
  • the thickness of the layer is determined so that the incident acoustic waves can be reflected on this layer.
  • the first face is shaped so as to include at least one recess forming a cavity extending in a direction opposite to the second face and emerging between the first and second faces.
  • cavities on one of the sides of the cell makes it possible to absorb sounds at low frequencies which are determined by the thickness, that is to say the dimension of the cavities in a direction transverse to the first side and the second side.
  • the resonant wavelength of each cavity corresponds to a quarter of the depth of each cavity.
  • the cavities each have a thickness of between 5 mm and 20mm.
  • the thicknesses of the cavities are determined so that the quarter-wave resonance frequencies are between the frequencies of the resonators whose dimensions are determined to be between 500 and 1500 Hz and the absorption frequencies of the porous matrix. between 2500 and 6000 Hz.
  • the second face is substantially planar and the cavity or cavities have a rectangular or square section.
  • the resonators each comprise at least one opening communicating a resonant cavity of the resonator with the porous matrix surrounding the resonator.
  • the opening of at least one of said at least one first resonator opens into the opening of a cavity of the first face.
  • the resonators each have an elongated shape in a given direction extending along the first and second faces of the cell.
  • the directions of elongation of the resonators are preferably substantially parallel to each other.
  • the resonators can be chosen from one or more of the types of resonators of the group comprising split tubes open at their ends and with a square, rectangular, circular, ellipsoidal or star-shaped section, Helmholtz resonance resonators comprising at least one neck tubular opening inside a cavity of the resonator.
  • the resonators are all of the same type.
  • the resonators are all tubes of circular section, split over their entire height.
  • the cell may comprise two first resonators forming a first row arranged between the first face and at least two second resonators forming a second row which is arranged between the first row of first resonators and the second face.
  • the first row and the second row can each comprise at least three resonators.
  • the invention also relates to an acoustically absorbing panel, characterized in that it comprises a plurality of cells as described above, the cells being arranged side by side so that the edges of the first faces of the cells are arranged facing each other and the edges of the second faces of the cells are arranged facing each other.
  • the panel can comprise five cells and preferably ten.
  • FIG 1 represents an acoustically absorbing cell 10 according to the prior art, comprising a layer 12 formed of a matrix of a porous material comprising a first 14 and a second 16 opposite faces facing each other and between which is arranged an acoustic resonator 18.
  • the dimensions of cell 10 are defined in the three perpendicular directions of space, in the direction X by its width I, in the direction Y by its thickness e and in the direction Z by its length L.
  • the acoustic resonator 18 is formed of a circular section tube open at its two opposite ends and comprising a slot 19 extending over the entire length of the tube.
  • the resonator 10 therefore has an elongated shape along a Z axis direction, the resonator 10 being arranged between the first 14 and second 16 faces so that the Z axis extends between along the first 14 and second 16 sides.
  • the first face 14 is covered with a layer 20 of a material more rigid than the porous matrix. In practice, it is desirable for the Young's modulus of layer 20 to be at least 20 GPa.
  • This rigid layer 20 can be made of brass or aluminum, or even wood, for example.
  • the porous matrix has a Young's modulus of the order of a few thousand kPa, which makes it possible to ensure a sufficiently large difference in impedance between the matrix and the rigid layer so as to guarantee total reflection of the acoustic waves at the 'interface.
  • the invention thus proposes an acoustically absorbing cell in which the resonators are ordered in a direction extending substantially perpendicularly to the first face and to the second face so that at least one first resonator is arranged between the first face and at least one second resonator which is arranged between the second face and the at least one first resonator.
  • the cell 22 comprises a first 24 and a second 26 rows of acoustic resonators between first 28 and second 30 faces of a layer 32 with a porous matrix.
  • the cell 22 comprises two opposite side faces 34, 36 substantially parallel and perpendicular to the first face 28 and second face 30.
  • the first row 24 is arranged, in a direction perpendicular to the first 28 and second 30 faces of the cell 22, between the first face 28 and the second row 26 of resonators, this second row 26 being arranged between the first row 24 and the second face 30 of the cell 22.
  • each of the first and second rows 24, 26 comprises two acoustic resonators A 1 , A 2 and A 3 , A 4 , respectively.
  • the resonators A 1 , A 2 and A 3 , A 4 used in this embodiment are split tubes as described above.
  • the tubes A 1 , A 2 , A 3 , A 4 thus each have an elongated shape in a direction Z extending along the first 28 and second 30 faces.
  • the Z axes of the tubes are substantially parallel to each other in the cell 22.
  • the first face 30 is also covered with a rigid layer as described with reference to the figure 1 .
  • the resonators A 1 , A 2 , A 3 , A 4 have dimensional parameters such that the resonators are all different in pairs.
  • the dimensional parameters considered are the thickness of the tube wall and the external radius mainly.
  • the angular opening of the slot of each ring also influences, but to a lesser extent, the resonant frequency of the resonators. By increasing the angular aperture, it is possible to slightly decrease the resonant frequency. However, the greater the angular opening, the lower the intensity of the resonance.
  • the distances d1-d5 separating two resonators A 1 , A 2 , A 3 , A 4 are all different in pairs so as to increase the destructive interference between two given resonators A 1 , A 2 , A 3 , A 4 , increasing correspondingly the absorption coefficient of the cell.
  • the first face 30 of the cell is shaped so as to include a recess defining a cavity 38 extending in a direction opposite to the second face 28 and emerging between the two first 28 and second 30 faces.
  • the split tube A 2 of the row 24 of resonators adjacent to the first face is located in the immediate vicinity of the cavity 38 and has its opening or slot 40 which opens in the direction of the outlet of the cavity 38.
  • This particular arrangement allows the The assembly formed by resonator A 2 and cavity 38 behaves like a resonator operating at a frequency lower than the resonant frequency of cavity 38 and resonator A2.
  • the cavity 38 of the first face 30 of the cell 22 extends along the Z axis substantially over the same distance as the split tube A 2 .
  • the table below summarizes the dimensional parameters of the four resonators A 1 , A 2 , A 3 and A 4 as well as their respective positioning in the cell. Angle values are measured with respect to the direction opposite to the direction of Y given on the picture 3 . The reference for the positions of the centers of the resonators is taken in R on the picture 3 .
  • E represents the thickness of the layer of porous material.
  • a represents the width of the cell along the X direction (see picture 3 ).
  • the following table summarizes the dimensional parameters of the cavity 38 and the positioning of the corner 37 of the cavity.
  • the values given for each column are those of a parameter x (without dimension) which constitutes a value of entry of a given equation in each column of interest.
  • the value in square brackets in each box indicates a preferred value within the range of values indicated.
  • the figure 4 represents the evolution of the absorption ⁇ (without unit) on the ordinate as a function of the frequency (in Hz) on the abscissa.
  • This graph comprises three curves, the first of which 42 relates to the absorption of a porous matrix alone in melamine, the second 44 relates to the absorption of the cell of the figure 1 with a melamine matrix and the third 46 relates to the absorption of the cell according to the invention of the picture 3 , also with a melamine matrix.
  • an absorption greater than 0.8 is obtained from 1000 Hz.
  • the absorption coefficient ⁇ increases to reach a value close to 1 from 1500 Hz, the absorption coefficient then remaining substantially constant and close to 1 up to frequencies of 6000 Hz and even beyond (not shown).
  • the figure 5 represents a second embodiment of a cell 48 according to the invention, comprising two rows 50, 52 of three resonators B 1 , B 2 , B 3 and B 4 , B 5 , B 6 each.
  • the first face 54 of the cell comprises two cavities 58, 60.
  • Each cavity 58, 60 opens directly in the direction of a resonator B 1 , B 2 whose diameter is substantially equal to the dimension of the cavity measured in the direction Y.
  • the opening 62 of the resonator B 2 emerges in the direction of the cavity 58 so as to create a resonant assembly (cavity 58 and resonator B 2 ) resonating at a lower frequency than each of the resonator B 2 and of the cavity 58, in isolation .
  • the table below summarizes the dimensional parameters of the six resonators B 1 , B 2 , B 3 , B 4 , B 5 and B 6 as well as their respective positioning in the cell. Angle values are measured with respect to the direction opposite to the direction of Y given on the figure 5 . The reference for the positions of the centers of the resonators is taken in R on the figure 5 .
  • the following table summarizes the dimensional parameters of the cavities 58, 60 and the positioning of the respective corners 59, 57 of these cavities.
  • the values given for each column are those of a parameter x (without dimension) which constitutes an input value d a given equation in each column of interest.
  • Values in square brackets in each box indicate a preferred value within the range of values shown.
  • the graph of the figure 6 is a graph similar to that of figure 4 .
  • Curve 64 represents the evolution of absorption ⁇ as a function of frequency and curves 42 and 44 are identical to those described with reference to the picture 3 .
  • the curve 64 comprises a first part 66 with a steeper slope than with the cell 22 of the picture 3 , demonstrating better absorption.
  • the absorption coefficient of cell 48 turns out to be slightly higher over almost all of the 0-6000 Hz frequency range than the absorption coefficient of cell 22.
  • the figure 7 is a graph representing the evolution of the absorption on the ordinate as a function of the frequency for the cell represented in figure 5 .
  • the various curves 68 represented each correspond to an angle of incidence value of the acoustic waves on the cell.
  • the curves 68a, 68b, 68c, 68d, 68e,... correspond to increasing angles and respectively at angle values of 90°, 85°, 80°, 75° and 70°.
  • the 70 curve of the figure 8 represents the evolution of the average absorption over the frequency range 0-6000 Hz as a function of the angle of incidence of the acoustic waves on the second face 54 of the cell 48 represented in figure 5 .
  • the absorption coefficient varies very little as a function of the angle of incidence and remains greater than 0.8 for angles between 0 and 75 degrees. Beyond 75 degrees, that is to say at incidence considered to be grazing, the absorption coefficient decreases until it reaches an average of 0.3 at 90 degrees. In the case of a grazing incidence, it is probable that the acoustic wave does not penetrate or hardly penetrates cell 48 but is on the contrary reflected by the second face and the first row of resonators B 4 , B 5 and B 6 .
  • this material can be considered almost omnidirectional and is totally suitable for use in a diffuse field, for example for building acoustics. Although not shown, a similar result is obtained for cell 22 of the picture 3 .
  • the "E" value of the thickness of the porous material is advantageously between 10 and 80 mm, preferably between 20 and 50 mm and more preferably is of the order of 40 mm. Indeed, for this last value it was found that for all types of cells, such as those described above, the absorption was between 0.58 and 0.60 on average over the frequency range 125-4000 Hz and from the order of 0.48 for this frequency range for a single porous element (without resonator) or a cell of the figure 1 .
  • “a” is advantageously between 1*E and 5*E, or alternatively between 10 and 400 mm, preferably between 20 and 160 mm and more preferably is of the order of 40 mm.
  • resonators can also be used instead of circular section tubes, such as split tubes open at their ends and with square, rectangular, ellipsoidal, star-shaped sections. It is also possible to use resonators formed from two split tubes 71, 72 with a section as described above and inserted one inside the other as shown in figure 9 . This type of resonator makes it possible to have lower resonance frequencies, but is difficult to achieve.
  • Helmholtz resonance resonators comprising at least one tubular neck open at both ends and emerging inside a cavity of the resonator.
  • An example of such a resonator 73 is shown in figures 10A and 10B .
  • This comprises a tubular part 74 closed at its ends by disks 76.
  • This type of so-called Helmholtz resonator is arranged in the same way as the tubes described with reference to the figure 3 and 5 with the axis of the tube extending along the Z direction.
  • a practical realization of a cell 80 with Helmholtz resonator is represented in figure 10C and comprises two rows 82, 84 of two resonators C 1 , C 2 , C 3 , C 4 between a first face 86 and a second face 88.
  • the first face 82 of the cell 80 comprises two cavities 90, 92.
  • the neck 94 of the resonators C 1 , C 2 emerges directly in the direction of a cavity 90, 92 so as to create a resonant assembly (cavity 90 and resonator C 1 as well as cavity 92 and resonator C 2 ) resonating at a lower frequency than each of the resonators C 1 , C 2 and cavities 90, 92 taken individually.
  • the table below summarizes the dimensional parameters of the four resonators C 1 , C 2 , C 3 , C 4 as well as their respective positioning in cell 80.
  • the angle values are measured with respect to the direction opposite to the direction of Y
  • the reference for the positions of the centers of the resonators is taken in R on the figure 10C .
  • the following table summarizes the dimensional parameters of the cavities 90, 92 and the positioning of the respective corners 96, 98 of these cavities 90, 92.
  • the values given for each column are those of a parameter x (without dimension) which constitutes an input value of an equation given in each column of interest.
  • Values in square brackets in each box indicate a preferred value within the range of values shown.
  • the figure 10D represents the evolution of the absorption ⁇ (without unit) on the ordinate as a function of the frequency (in Hz) on the abscissa. It can be seen that the absorption is greater than 0.9 from approximately 850 Hz and up to 3000 Hz, the absorption being even greater than that obtained with the cells of the figure 3 and 5 over this frequency range. However, it is noted that above 3000 Hz, the absorption decreases quite clearly.
  • the figures 11 and 12 represent two other embodiments of the invention in which the cell 100, 102 comprises only two acoustic resonators, which here are split tubes.
  • two resonators 104, 106 are arranged one behind the other in a direction (Y axis) perpendicular to the first 108 and second 110 faces of the cell 100.
  • a cavity 112 is formed on the first face 108 of the cell 100.
  • a first resonator 114 is arranged, in a direction (Y axis) perpendicular to the first face 118 and to the second face 120, between a second resonator 116 and the first face 118 of the cell, the second resonator 116 being arranged between the first resonator 114 and the second face 120 of the cell 102.
  • the first face 118 of the cell 102 comprises two cavities 122, 124.
  • the first resonator 114 is offset along the X axis with respect to the second resonator 116.
  • each of the first 114 and of the second 116 resonator is aligned in a direction parallel to the Y axis with a cavity of the first face.
  • the slot or opening of the first resonator 114 emerges in the direction of the cavity 124.
  • the table below summarizes the dimensional parameters of the two resonators D 1 , D 2 as well as their respective positioning in the cell of the figure 12 .
  • the angle values are measured with respect to the direction opposite to the positive direction of Y.
  • the reference for the positions of the centers of the resonators is taken in R on the figure 12 .
  • the table below summarizes the dimensional parameters of the cavities 124, 122 and the positioning of the respective corners 126, 128 of these cavities.
  • the values given for each column are those of a parameter x (without dimension) which constitutes an input value d a given equation in each column of interest.
  • Values in square brackets in each box indicate a preferred value within the range of values shown.
  • resonators A 1 -A 4 , B 1 -B 6 , C1-C4, D1-D2 all different in pairs by their dimensional parameters as shown and described with reference to figure 3 and 5 makes it possible to ensure absorption of each resonator at a different resonant frequency, which makes it possible to ensure absorption over a wide frequency range. For this, it is desirable for these different resonance frequencies to be sufficiently close to each other.
  • the cells 22, 48 are arranged next to each other so that the edges of the first faces 30, 54 of the cells are arranged opposite each other and the edges of the second faces 28, 56 of the cells are arranged opposite each other.
  • the figures 13 and 14 represent such an acoustic panel 130 with a cell similar to that of the picture 3 which comprises two rows of two acoustic resonators each. However, in the example of figures 13 and 14 , the cell comprises two cavities at its first face.
  • the acoustic panel thus obtained thus comprises a plurality of juxtaposed cells, for example five and preferably ten, which makes it possible to obtain the best absorption results for the different types of cells. It would still be possible to add a second thickness of cells, which would improve the absorption performance, mainly in the 500-4000 Hz range. However, this requires doubling the thickness of the acoustic panel and this type of configuration should therefore be reserved for specific applications, such as recording studios, for example.
  • the term “porous matrix” designates a material with a rigid skeleton saturated with a fluid which can be air in the case of an application in the building industry.
  • the saturation rate that is to say the ratio of the volume of fluid to the volume of liquid must be at least 80%.
  • the porous matrix 32 can be formed from at least one of the following materials: melamine, polyurethane foam, glass wool, rock wool, straw, hemp, cellulose wadding, palm fiber, coconut fiber.
  • the resonators A 1 -A 4 , B 1 -B 6 , C1-C4, D1-D2 can be made of steel, plastic, rubber or bamboo. Hollow reed can also be used.
  • the cavities of the cells 22, 48, 80, 100, 102 can be filled with the same material as the rest of the porous layer or else be filled with another porous material.
  • the cavities 38, 58, 60, 90, 92, 112, 122, 124 of the resonators 22, 48, 80, 100, 102 can be filled with the same porous material as that of the porous layer or else be filled with a different porous material.
  • the cells 22, 48, 80, 100, 102 according to the invention are produced in two stages.
  • the first consists in producing, in a block of porous material, several orifices whose sections correspond to the sections of the resonators using a suitable cutting tool, for example mounted on a drill press and in taking the cores of porous material thus obtained.
  • the resonators are then introduced into the corresponding orifices.
  • the block of porous material is then cut to the desired size of the cell using, for example, a band saw or by water jet cutting.
  • the invention can be defined as an acoustically absorbing cell for an acoustic panel, comprising a porous matrix layer incorporating a plurality of acoustic resonators (A1-A4, B1-B6) between a first face 30, 54, 86 and a second face 28, 56, 88 of the porous matrix 32, characterized in that the resonators A 1 -A 4 , B 1 -B 6 , C1-C4 are ordered so as to form at least two substantially parallel rows each comprising at least two resonators and extending along the first and second faces.
  • a first row 24, 50, 82 is arranged between the first face 30, 54, 86 and at least two second resonators forming a second row 26, 52, 88 which is arranged between the first row 24, 50, 82 of resonators and the second side 28, 56, 88.
  • the invention may also relate to an acoustically absorbing cell comprising a porous matrix layer incorporating a plurality of acoustic resonators between a first face and a second face of the porous matrix, the dimensional characteristics of the resonators being determined so that the resonators are all different two by two.
  • the invention may also relate to an acoustically absorbing cell comprising a porous matrix layer incorporating a plurality of acoustic resonators between a first face and a second face of the porous matrix, the first face being shaped so as to comprise at least one recess forming a cavity extending in a direction opposite to the second face and opening out between the two first and second faces.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
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  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Claims (13)

  1. Schallabsorbierende Zelle (22, 48, 80, 100, 102) für eine Akustikplatte, enthaltend eine Schicht (32) mit poröser Matrix, die eine Vielzahl von akustischen Resonatoren (A1-A4, B1-B6, C1-C4, D1-D2) zwischen einer ersten Seite (30, 54, 86, 108, 118) und einer zweiten Seite (28, 56, 88, 110, 120) der porösen Matrix (32) einschließt,
    wobei die Resonatoren (A1-A4, B1-B6, C1-C4, D1-D2) so angeordnet sind, dass in einer Richtung, die sich im Wesentlichen senkrecht zu der ersten Seite (30, 54, 86, 108, 118) und der zweiten Seite (28, 56, 88, 110, 120) erstreckt, zumindest ein erster Resonator zwischen der ersten Seite (30, 54, 86, 108, 118) und zumindest einem zweiten Resonator, der zwischen der zweiten Seite (28, 56, 88, 110, 120) und dem zumindest einen ersten Resonator angeordnet ist, angeordnet ist, wobei die Resonatoren (A1-A4, B1-B6) jeweils zumindest eine Öffnung aufweisen, die einen Resonanzhohlraum des Resonators mit der den Resonator umgebenden porösen Matrix in Verbindung bringt,
    dadurch gekennzeichnet, dass
    die Öffnung (40, 62) von zumindest einem des zumindest einen ersten Resonators (A2, B2) in die Öffnung eines Hohlraums (38, 58) der ersten Seite mündet.
  2. Zelle nach Anspruch 1,
    dadurch gekennzeichnet, dass die Abmessungsmerkmale der Resonatoren (A1-A4, B1-B6, C1-C4, D1-D2) so bestimmt sind, dass die Resonatoren (A1-A4, B1-B6, C1-C4, D1-D2) alle paarweise unterschiedlich sind.
  3. Zelle nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass die Abstände (d1-d5), die zwei Resonatoren (A1-A4, B1-B6, C1-C4, D1-D2) voneinander trennen, alle paarweise unterschiedlich sind.
  4. Zelle nach einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet, dass die erste Seite (30, 54, 86, 108, 118) eine Schicht (31) aus einem starren Material mit beispielsweise einem Elastizitätsmodul von zumindest 20GPa aufweist.
  5. Zelle nach einem der Ansprüche 1 bis 4,
    dadurch gekennzeichnet, dass die erste Seite (30, 54, 86, 108, 118) so ausgebildet ist, dass sie zumindest eine Vertiefung (38, 58, 60) aufweist, die einen Hohlraum bildet, der sich in einer zur zweiten Seite (28, 56) entgegengesetzten Richtung erstreckt und zwischen der ersten und der zweiten Seite ausmündet.
  6. Zelle nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass die Resonatoren (A1-A4, B1-B6) ausgewählt sind aus einem oder mehreren der Resonatortypen aus der Gruppe bestehend aus geschlitzten Rohren, die an ihren Enden offen sind und einen quadratischen, rechteckigen, kreisförmigen, ellipsoiden oder sternförmigen Querschnitt haben, aus Helmholtz-Resonatoren mit zumindest einem röhrenförmigen Hals, der in einen Hohlraum des Resonators mündet.
  7. Zelle nach Anspruch 6,
    dadurch gekennzeichnet, dass die Resonatoren (A1-A4, B1-B6) alle vom gleichen Typ sind.
  8. Zelle nach Anspruch 6,
    dadurch gekennzeichnet, dass die Resonatoren (A1-A4, B1-B6) alle Rohre mit kreisförmigem Querschnitt sind, die über ihre gesamte Höhe geschlitzt sind.
  9. Zelle nach einem der Ansprüche 1 bis 8,
    dadurch gekennzeichnet, dass sie zumindest zwei erste Resonatoren enthält, die eine erste Reihe (24, 50) bilden, welche zwischen der ersten Seite und zumindest zwei zweiten Resonatoren angeordnet ist, die eine zweite Reihe (26, 52) bilden, welche zwischen der ersten Reihe von Resonatoren und der zweiten Seite angeordnet ist.
  10. Zelle nach Anspruch 9,
    dadurch gekennzeichnet, dass die erste Reihe und die zweite Reihe jeweils zumindest drei Resonatoren umfassen.
  11. Zelle nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass die zweite Seite (28, 56) im Wesentlichen eben ist.
  12. Schallabsorbierende Platte,
    dadurch gekennzeichnet, dass sie eine Vielzahl von Zellen (22, 48) nach einem der vorhergehenden Ansprüche umfasst, wobei die Zellen (22, 48) so nebeneinander angeordnet sind, dass die Ränder der ersten Seiten der Zellen (22, 48) gegenüberliegend angeordnet sind und die Ränder der zweiten Seiten der Zellen (22, 48) gegenüberliegend angeordnet sind.
  13. Platte nach Anspruch 12,
    dadurch gekennzeichnet, dass sie zumindest fünf Zellen, vorzugsweise zehn Zellen, umfasst.
EP14786988.7A 2013-08-29 2014-08-29 Akustikplatte Active EP3039672B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1358261A FR3010225B1 (fr) 2013-08-29 2013-08-29 Panneau acoustique absorbant
PCT/FR2014/052149 WO2015028760A1 (fr) 2013-08-29 2014-08-29 Panneau acoustique

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EP3039672A1 EP3039672A1 (de) 2016-07-06
EP3039672B1 true EP3039672B1 (de) 2022-10-05

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US (1) US9818393B2 (de)
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FR (1) FR3010225B1 (de)
WO (1) WO2015028760A1 (de)

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FR3035737B1 (fr) 2015-04-29 2018-08-10 Centre National De La Recherche Scientifique Metamateriau acoustique pour l'isolation et son procede de fabrication
US10460714B1 (en) * 2016-02-05 2019-10-29 United States Of America As Represented By The Administrator Of National Aeronautics And Space Administration Broadband acoustic absorbers
KR20190011780A (ko) 2016-05-31 2019-02-07 블루에어 에이비 공기 여과기의 활용된 용량을 결정하기 위한 방법
DE102016124755B3 (de) * 2016-12-19 2018-02-15 Liaver Gmbh & Co. Kg Schallabsorbierendes Bauelement mit Löschungsprofilen sowie Schallschutzwand
USD855139S1 (en) * 2018-09-26 2019-07-30 David John Fischer Firearm holster support
US11320235B2 (en) 2018-09-26 2022-05-03 David John Fischer Barrel held firearm carrier
FR3090981B1 (fr) 2018-12-21 2022-01-28 Metacoustic Panneau acoustiquement isolant
EP4094251A4 (de) 2020-01-21 2024-02-21 ADBM Corp. Gleichzeitiges dämpfen hoher frequenzen und verstärken niedriger frequenzen von unterwassergeräuschen

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Also Published As

Publication number Publication date
EP3039672A1 (de) 2016-07-06
FR3010225A1 (fr) 2015-03-06
US9818393B2 (en) 2017-11-14
US20160210955A1 (en) 2016-07-21
WO2015028760A1 (fr) 2015-03-05
FR3010225B1 (fr) 2016-12-30

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