EP3384487A1 - Métamatériau acoustique absorbant - Google Patents
Métamatériau acoustique absorbantInfo
- Publication number
- EP3384487A1 EP3384487A1 EP16819595.6A EP16819595A EP3384487A1 EP 3384487 A1 EP3384487 A1 EP 3384487A1 EP 16819595 A EP16819595 A EP 16819595A EP 3384487 A1 EP3384487 A1 EP 3384487A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cell
- groove
- width
- depth
- acoustic
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 230000002745 absorbent Effects 0.000 title description 3
- 239000002250 absorbent Substances 0.000 title description 3
- 238000010521 absorption reaction Methods 0.000 claims abstract description 35
- 239000011343 solid material Substances 0.000 claims abstract description 12
- 210000004027 cell Anatomy 0.000 claims description 75
- 229920000642 polymer Polymers 0.000 claims description 5
- 210000005056 cell body Anatomy 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 description 14
- 239000007787 solid Substances 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000007799 cork Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000006262 metallic foam Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
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
- 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
- G10K11/02—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
- G10K11/162—Selection of materials
- G10K11/168—Plural layers of different materials, e.g. sandwiches
Definitions
- the invention relates to the field of acoustic insulators.
- the invention relates to an elementary cell of an acoustic metamaterial, and acoustic screen comprising such a cell.
- Noise pollution in everyday life for example from the outside environment, such as the proximity of a road or air, or inside as the noise of home appliances, are stressors that deteriorate the comfort of life.
- the acoustic insulants known from the state of the art rely 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 metal foams or polymeric materials, rockwool, glass, cotton, cork or agglomerated wood fibers.
- a problem with the use of such materials is that the choice of the material to be used is dictated by the intrinsic characteristics of the material, which limits the possibility of choice of material with respect to a given application. Moreover, relying on the intrinsic properties of the material also limits the frequency range of response of the material as well as the manufacturing techniques.
- acoustic panels made from such materials are heavy and bulky, especially those used for low frequencies.
- the objective of the present invention is to solve the problems of acoustic insulation known from the state of the art.
- the invention aims to provide an acoustic insulation solution, effective and to have flexibility in the choice of material and the frequency range.
- the invention also aims to reduce the size and weight of acoustic panels
- the subject of the invention is an elementary acoustic metamaterial cell comprising:
- At least one resonator in the form of a groove of width 1 and of depth p, said groove being open at the surface of said body of solid material.
- the open groove on the surface of the solid material body constitutes a reasoning cavity that makes it possible to have a high degree of spatial confinement of the acoustic energy. This confinement consequently makes it possible to have a good absorption of the sound waves. This also allows to reduce the reflection and transmission of sound waves.
- solid materials for example: wood, glass, metals and polymers. This therefore allows a large margin of maneuver as to the manufacturing techniques used.
- the elementary cell according to the invention can be used for a wide range of frequencies, ranging from 100 Hz to 10 kHz, which respectively corresponds to wavelengths between 3.5 meters and 3.5 centimeters.
- the length p p sff of the cavity is also the depth of the groove defining the cavity.
- the inventors have, moreover, found that the opening width of the cavities "1" plays a decisive role in the dissipation of acoustic energy.
- the width 1 corresponding to the gap between the walls of the groove.
- the maximum energy density reached calculated as the sum of the kinetic energy and the potential energy, evolves logarithmically with respect to the width of the openings E ms: x "log (Î)
- the energy density confined in the cavity is controlled by the cavity width.
- FIG. 9 illustrates the effect of the width 1 on the variation of the maximum energy density in a cavity for which the effective length determines a resonant frequency of 1 kHz.
- the groove is cylindrical, polygonal or rectilinear.
- the flexibility in terms of geometry of the groove allows to choose the pattern that one wants, for example to improve the aesthetics of the global structure.
- said groove is discontinuous and is in the form of sectors separated by the solid material constituting the body. This makes it possible to widen the frequency band of absorption.
- the cell body has a plurality of grooves. This increases the absorption of sound waves.
- said grooves are concentric. This mode of distribution has the advantage of ensuring a spatial homogeneity of absorption of sound waves due to symmetry.
- the groove (s) present (s) a width 1 constant over the entire depth p of said (said) groove (s).
- At least two grooves have widths 1 and depths p different from each other. This makes it possible to broaden the frequency band of absorption and to control the absorption efficiency by frequency. In fact, the geometric dimensions of the grooves make it possible to control both the frequency and the efficiency of the absorption.
- the depth p determines the absorption frequency of each groove, and the width 1 determines its absorption efficiency.
- the body of solid material comprises at least one through cut.
- a notch allows the circulation of air and promotes heat exchange between two media separated by the cell or a panel comprising the cell.
- the groove (s) is (are) folded (s) so as to have only one opening and several folds inside the cell.
- the thickness of the structure defined by the depth of the groove, can be divided by 10, while maintaining the same absorption performance.
- At least one groove contains a fluid or polymer.
- Said fluid or polymer may be contained by means of a thin membrane on the surface of said cell. This allows to induce or increase the sound absorption at even lower frequencies, depending on the nature of the fluid, that is to say gas or liquid, or the polymer.
- the cell body is cylindrical, parallelepipedal or pyramidal. This flexibility regarding the overall shape of the cell facilitates the design.
- the invention also relates to an acoustic screen in the form of a panel comprising at least one elementary cell of metamaterial according to the invention.
- a screen can comprise only absorbent elementary cells according to the invention, but it can also include other acoustic elements, for example reflective acoustic cells.
- said acoustic screen comprises a multitude of elementary cells according to the invention, arranged so that each cell is able to act on another neighboring cell, so as to modify the resonance frequencies. This also makes it possible to generate a favorable interaction for the absorption of sound waves.
- the interaction between cells makes it possible to widen the absorption spectrum and locally increase the transmission or reflection, which makes it possible to isolate a chamber better or to suppress the noise.
- plane of the panel means, in the sense of the present application, the surface of the panel which can be flat or curved.
- the elementary cells are arranged in said panel periodically.
- the patterns of periodicity make it possible to promote the emergence of an attenuation effect due to the network arrangement of resonant units.
- FIGS. 1a to 1c show a first exemplary embodiment of an elementary cell according to the invention, comprising a simple groove in the form of a cylinder;
- - Figures 2a and 2c show a second embodiment, wherein the elementary cell is parallelepiped and comprises a linear groove;
- FIGS. 3a to 3d show an exemplary embodiment, in which the elementary cell is cylindrical and comprises three concentric cylindrical grooves;
- FIG. 4a to 4c show an embodiment, wherein the cell is parallelepiped and comprises three linear grooves;
- FIGS. 5a to 5c show an exemplary embodiment, in which the cell is cylindrical and comprises a folded cylindrical groove
- FIG. 6a to 6c show an embodiment, wherein the cell is parallelepiped and comprises a folded linear groove.
- FIG. 7 represents the sound wave absorption response of an elementary cell according to the invention.
- FIG. 8 shows a comparison of absorption curves obtained with elementary cells according to the invention, the grooves of which have different widths.
- FIG. 9 shows a variation of the energy density confined as a function of the width of a groove for which the effective length determines a resonant frequency of 1 kHz, according to the invention.
- FIG. 1a is an isometric view of an elementary cell 1 of an acoustic metamaterial according to the invention.
- Figures lb and represent respectively a top view and a view of a longitudinal section along the axis AA of the cell 1.
- Cell 1 comprises a cylindrical solid body 2 comprising a groove 3 which is also cylindrical.
- the groove 3 is characterized by a depth p and a width 1, as shown in FIG.
- the width 1 being the distance between the side walls of the groove 3.
- the presence of the groove which constitutes a reasoning cavity, makes it possible to have a high degree of spatial confinement of the acoustic energy, which consequently makes it possible to absorb the sound waves and to induce a reduction of the reflection and the transmission.
- the depth p defines the resonance frequency and the width 1 determines the efficiency of the cell. It is therefore possible to play on these two parameters to adjust the frequency and the absorption efficiency of the sound waves by the elementary cell 1.
- Figure 2a shows an isometric view of an elementary cell parallelepiped.
- Figures 2b and 2c respectively show a top view and a view of a longitudinal section along the axis A 'A' of the cell 1 '.
- the cell comprises a parallelepiped solid body 2 'comprising a linear groove 3'.
- the groove 3 ' is characterized by a depth p' and a width l ', as in the case of the example of FIG.
- FIG. 3a shows an isometric view of an elementary cell 10 comprising a cylindrical solid body and three concentric cylindrical grooves 30, 31, 32.
- FIGS. 3b and 3c represent respectively a view from above and a view of a longitudinal section along the axis BB, of the cell 10.
- the three grooves 30, 31, 32 have the same depth and the same width as shown in FIG. 3c.
- Figure 3d illustrates a view of a section similar to the view illustrated in Figure 3c, of a cell 10 'which comprises a cylindrical solid body 20' and three concentric cylindrical grooves 30 ', 31', 32 '.
- the cell 10 ' is identical to the one 10 shown in Figures 3a to 3C, except for the depths and widths of the grooves 30', 31 ', 32' which are different for each of the three grooves 31 ', 32' , 33 '. This makes it possible to have a different resonant frequency and absorption efficiency for each groove.
- FIG. 4a is an isometric view of a parallelepipedal cell 10.
- Figures 4b and 4c show respectively a top view and a longitudinal sectional view along the B “B" axis of the cell 10 ".
- the cell 10 "comprises a parallelepipedic solid body 20 comprising three grooves 30", 31 ", 32" which have the same depth and the same width as shown in the sectional view of FIG. 4c.
- FIGS. 5a is an isometric view of an elementary cell 100 according to an exemplary embodiment, in which the cell 100 comprises a cylindrical solid body 200 and a folded cylindrical groove 300.
- FIGS. 5b and 5c respectively represent a view from above and a view of a longitudinal section along the axis CC of the cell 100.
- FIG. 5c illustrates the folds of the groove 300.
- the folding of the groove 300 makes it possible to considerably reduce the thickness of the cell 100, while keeping the absorption efficiency of a groove whose depth corresponds to the length of the grooves. walls of the groove 300.
- FIG. 6a represents an isometric view of a parallelepipedal elementary cell 100 'comprising a parallelepipedal solid body 200' and a folded linear groove 300 '.
- Figures 6b and 6c respectively show a top view and a longitudinal sectional view along the axis C'C 'of the cell 100'.
- the parallelepiped shape has the advantage of allowing a better filling of the surface of an acoustic panel.
- FIG. 7 illustrates the absorption response of an elementary cell according to the embodiment shown in the diagrams of FIGS. 3a to 3c, but with a different depth for each groove.
- This elementary cell has an overall height of 196.5 mm and comprises 3 resonant cavities in the form of concentric cylindrical grooves with a fixed width of 2.7 mm, and different depths of 160.5 mm, 177 mm, and 193.5 mm, respectively.
- This cell was manufactured by the Project SD3500 3D printer, whose characteristics of the Visijet Crystal resin used are presented below:
- the diameter of the transmission tube used is 100 mm, which makes it possible to take measurements for frequency intervals of [50: 1600] -Hz.
- a loudspeaker placed at one end of the tube, generates white noise on the frequency band of interest.
- the pressure measurements are performed using two terminations provided different impedance.
- Figure 7 shows in particular the first three resonance frequencies for which an exalted absorption takes place, with absorption coefficients reaching up to 0.97.
- the absorption values obtained are:
- Figure 8 is a comparison of the absorption curves obtained for different width of grooves for four cells according to the embodiment shown in Figures la to le.
- Said cells each have a cylindrical groove with a depth of 100 mm and groove widths of 15 mm, 10 mm, 5 mm, and 2 mm, respectively.
- the radius of each cell is 25 mm.
- Figure 8 shows an increase in absorption as the groove width decreases. This absorption increases respectively from 0.05 to 0.08 to 0.26 then to 0.37 simply by decreasing the parameter of dimension 1.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1561744A FR3044812B1 (fr) | 2015-12-02 | 2015-12-02 | Metamateriau acoustique absorbant |
PCT/FR2016/053190 WO2017093693A1 (fr) | 2015-12-02 | 2016-12-02 | Métamatériau acoustique absorbant |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3384487A1 true EP3384487A1 (fr) | 2018-10-10 |
EP3384487B1 EP3384487B1 (fr) | 2023-04-19 |
Family
ID=55300607
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16819595.6A Active EP3384487B1 (fr) | 2015-12-02 | 2016-12-02 | Métamatériau acoustique absorbant |
Country Status (5)
Country | Link |
---|---|
US (1) | US11081095B2 (fr) |
EP (1) | EP3384487B1 (fr) |
JP (1) | JP6822643B2 (fr) |
FR (1) | FR3044812B1 (fr) |
WO (1) | WO2017093693A1 (fr) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101825480B1 (ko) * | 2016-04-29 | 2018-03-23 | 서울대학교산학협력단 | 음향 파라미터 제어형 메타 원자 및 이를 포함하는 메타 물질 |
WO2018146489A1 (fr) | 2017-02-09 | 2018-08-16 | The University Of Sussex | Manipulation d'ondes acoustiques à l'aide d'un réseau temporisateur |
CN110880312B (zh) * | 2018-09-05 | 2023-10-27 | 湖南大学 | 一种水下亚波长局域共振型声学超材料 |
CN110011068B (zh) * | 2019-04-26 | 2021-04-02 | 内蒙古大学 | 一种频率可主动调谐的太赫兹超材料吸波器及其制造方法 |
CN111105774A (zh) * | 2019-10-29 | 2020-05-05 | 同济大学 | 亥姆霍兹共振器及基于其的低频宽带吸声降噪结构 |
TWI818224B (zh) * | 2021-01-13 | 2023-10-11 | 逸陞有限公司 | 降噪模組 |
CN114104234B (zh) * | 2021-11-30 | 2023-08-08 | 浙江大学 | 覆盖层漫反射式吸声超结构单元及超结构 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1031671A3 (fr) * | 1999-02-24 | 2002-11-13 | William Garrard (Leighton Buzzard) Limited | Eléments porteurs insonorisants |
US20050258000A1 (en) * | 2004-05-20 | 2005-11-24 | Hiroshi Yano | Noise reducing equipment |
CN102016977A (zh) * | 2008-03-03 | 2011-04-13 | 3M创新有限公司 | 管理气体流动系统中的可听声频的方法 |
KR20110004418A (ko) * | 2008-04-14 | 2011-01-13 | 쓰리엠 이노베이티브 프로퍼티즈 컴파니 | 다층 흡음 시트 |
GB0901982D0 (en) * | 2009-02-06 | 2009-03-11 | Univ Loughborough | Attenuators, arrangements of attenuators, acoustic barriers and methods for constructing acoustic barriers |
KR102046102B1 (ko) * | 2012-03-16 | 2019-12-02 | 삼성전자주식회사 | 메타물질의 코일 기반 인공원자, 이를 포함하는 메타물질 및 소자 |
US9179220B2 (en) * | 2012-07-10 | 2015-11-03 | Google Inc. | Life safety device with folded resonant cavity for low frequency alarm tones |
US9330651B1 (en) * | 2015-07-16 | 2016-05-03 | Hong Jen Wang | Acoustic absorbing combination |
WO2019021483A1 (fr) * | 2017-07-28 | 2019-01-31 | イビデン株式会社 | Élément absorbant acoustique, composant pour véhicule, et automobile |
-
2015
- 2015-12-02 FR FR1561744A patent/FR3044812B1/fr active Active
-
2016
- 2016-12-02 US US15/781,394 patent/US11081095B2/en active Active
- 2016-12-02 EP EP16819595.6A patent/EP3384487B1/fr active Active
- 2016-12-02 JP JP2018528797A patent/JP6822643B2/ja active Active
- 2016-12-02 WO PCT/FR2016/053190 patent/WO2017093693A1/fr active Application Filing
Also Published As
Publication number | Publication date |
---|---|
FR3044812A1 (fr) | 2017-06-09 |
JP2018536201A (ja) | 2018-12-06 |
FR3044812B1 (fr) | 2018-11-02 |
US20180357994A1 (en) | 2018-12-13 |
JP6822643B2 (ja) | 2021-01-27 |
EP3384487B1 (fr) | 2023-04-19 |
US11081095B2 (en) | 2021-08-03 |
WO2017093693A1 (fr) | 2017-06-08 |
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