EP2054562A1 - Sound-absorbing assembly - Google Patents

Sound-absorbing assembly

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Publication number
EP2054562A1
EP2054562A1 EP06794322A EP06794322A EP2054562A1 EP 2054562 A1 EP2054562 A1 EP 2054562A1 EP 06794322 A EP06794322 A EP 06794322A EP 06794322 A EP06794322 A EP 06794322A EP 2054562 A1 EP2054562 A1 EP 2054562A1
Authority
EP
European Patent Office
Prior art keywords
micro
perforations
acoustic assembly
support
assembly according
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
Application number
EP06794322A
Other languages
German (de)
French (fr)
Other versions
EP2054562B1 (en
Inventor
Jean-Marc Scherrer
Christian Nocke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brevetix SARL
Original Assignee
Brevetix SARL
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Filing date
Publication date
Application filed by Brevetix SARL filed Critical Brevetix SARL
Publication of EP2054562A1 publication Critical patent/EP2054562A1/en
Application granted granted Critical
Publication of EP2054562B1 publication Critical patent/EP2054562B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F13/00—Coverings or linings, e.g. for walls or ceilings
    • E04F13/07—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor
    • E04F13/08—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements
    • E04F13/0867—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements having acoustic absorption means on the visible surface
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B1/8409—Sound-absorbing elements sheet-shaped
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B2001/8263—Mounting of acoustical elements on supporting structure, e.g. framework or wall surface
    • E04B2001/8281—Flat elements mounted parallel to a supporting surface with an acoustically active air gap between the elements and the mounting surface

Definitions

  • the absorption spectrum that is to say the curve representing the variation of the absorption of the wall ⁇ g iobai e as a function of the sound frequency emitted is related to the diameter of the micro-perforations , and that, all the parameters being equal elsewhere, the cigiohaie absorption was better in the high frequencies when the diameters of the micro-perforations were greater. Conversely, for microperforations of smaller diameter absorption was improved in the low frequencies.
  • the present invention aims to provide an acoustic assembly for expanding the effective acoustic absorption band of an acoustic assembly using one or more walls pierced with microperforations, this acoustic assembly being intended to constitute for example a false wall of a room that is to say a partition or a ceiling, but also a lining of a vehicle etc. ..
  • the present invention thus relates to an acoustic absorbent assembly intended to constitute, within an enclosure, at least one wall element, this assembly comprising at least one support provided with micro-perforations whose diameter is less than 2 mm. characterized in that
  • the support extends substantially parallel to an adjacent wall
  • the acoustic assembly comprises at least two sets of micro-perforations distributing on said support.
  • the micro-perforations may be distributed on one or more supports.
  • the series of micro-perforations will have respective different surfaces and, when this absorbent assembly will have several supports, the series of micro-perforations may be identical on the two supports, are identical on each support but different from one medium to another, or different on each of the supports.
  • the acoustic assembly may also of course be constituted by at least two parallel flat or non-planar walls each comprising a combination of two series of microperforations, of different surfaces.
  • FIG. 2 is a schematic vertical sectional drawing of an example of an arrangement of a micro-perforated stretched fabric with respect to a ceiling
  • FIG. 3 is a graph showing the variation of the sound absorption of a micro-perforated fabric. perforated of the type shown in Figure 1 implemented according to Figure 2, depending on the sound frequency,
  • FIG. 4 is a schematic partial perspective view of a micro-perforated fabric according to the prior art and comprising larger microperforations and spacings than in the embodiment shown in FIG. 1.
  • FIG. 5 is a graph showing the variation of the sound absorption of a micro-perforated fabric of the type represented in FIG. 4 implemented according to FIG. 2, as a function of the sound frequency
  • FIGS. 6a and 6b are partial diagrammatic plan views of a micro-perforated fabric according to the invention which is provided with orifices of the same types as those respectively shown in Figures 1 and 4, respectively with a square mesh and a triangular mesh.
  • FIG. 7 is a graph showing the variation of the sound absorption of an acoustic assembly according to the invention consisting of a micro-perforated cloth of the type of that represented in FIGS. 6a and 6b implemented in an embodiment according to FIG. Figure 1, depending on the sound frequency.
  • FIG. 8 is a schematic vertical sectional drawing of an example of an arrangement of two micro-perforated canvases with respect to a ceiling
  • FIG. 9 is a graph showing the variation of the sound absorption of an acoustic assembly according to FIG. invention consisting of two micro-perforated superimposed and identical fabrics.
  • FIG. 10 is a graph showing the variation of the sound absorption of an acoustic assembly according to the invention consisting of two superimposed micro-perforated canvases, the diameter and the spacing of the microperforations being different.
  • FIGS. 6a and 6b show an acoustic absorbent assembly produced according to the invention and which consists of a single wall 3 formed of a thin polyvinyl chloride (PVC) cloth (0.17 mm) intended to to constitute a false ceiling of a room and which, for this purpose, is stretched at a distance D of 100 mm under the true ceiling 1 thereof as shown in Figure 1.
  • PVC polyvinyl chloride
  • FIG. 9 shows the acoustic absorption spectrum of such an assembly. It can also be seen that such an arrangement makes it possible to obtain a consequent absorption ⁇ of 0.5 in a range of frequencies extending from about 300 Hz up to 5000 Hz, or over a frequency range of about 4700 Hz.
  • the acoustic assembly also consists of two webs 3a and 3b of the same respective thicknesses and which are arranged as before.
  • the first web 3a is uniformly perforated by holes 0.2 mm in diameter which are distributed uniformly over its surface and are separated from each other by a distance of 2 mm.
  • the second fabric 3b is uniformly perforated by larger holes, 0.5 mm in diameter, which are distributed uniformly over its surface and which are separated from each other by a distance of 14 mm.
  • FIG. 10 shows the acoustic absorption spectrum of such an assembly. It can be seen that such an arrangement makes it possible to obtain a consequent absorption of 0.5 in a frequency range extending from about 150 Hz to 5000 Hz, ie over a frequency range of the order of 4850 Hz.
  • the present invention thus makes it possible to extend the range of frequencies that are absorbed by thin walls provided with micro-perforations.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Electromagnetism (AREA)
  • Building Environments (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

The present invention relates to a sound-absorbing assembly designed to form, within an enclosure, at least one wall element, the assembly comprising at least one support provided with microperforations whose diameter is less than 2 mm. The assembly is characterized in that: the support (3, 3a, 3b) extends approximately parallel to an adjacent wall (1), and the sound assembly comprises at least two series of micro-perforations (d<SUB>1</SUB>, d<SUB>2</SUB>) distributed over said support (3, 3a, 3b).

Description

ENSEMBLE ACOUSTIQUEMENT ABSORBANT ACOUSTICALLY ABSORBENT ASSEMBLY
La présente invention concerne un ensemble acoustiquement absorbant destiné à constituer un élément de paroi disposé dans une enceinte, telle que par exemple un appartement, une salle de concert, l'habitacle d'un véhicule etc, et permettant de contrôler l'état d'absorption acoustique de celle-ci.The present invention relates to an acoustically absorbent assembly intended to constitute a wall element disposed in an enclosure, such as for example an apartment, a concert hall, the passenger compartment of a vehicle, etc., and for controlling the state of sound absorption thereof.
On sait que le contrôle de l'absorption des sons par des parois a fait appel à des dispositifs divers comprenant des éléments d'absorption passifs constitués de matériaux poreux présentant la propriété de transformer en chaleur les vibrations sonores qu'ils recevaient en raison des phénomènes de friction auxquels ces matériaux étaient soumis du fait de ces vibrations. On sait que l'utilisation de tels éléments absorbants présente un certain nombre d'inconvénients, à savoir notamment leur encombrement et leur poids ainsi que leur faculté de n'absorber les vibrations sonores que dans des domaines réduits du spectre. On a également proposé de faire appel à des éléments de paroi rigides perforés d'une série de trous répartis régulièrement sur leur surface, ces trous perforés ayant des diamètres de l'ordre de 5 à 6 mm. On a constaté que de tels éléments absorbants présentaient de notables inconvénients et notamment une très faible efficacité s'ils n'étaient combinés à des éléments poreux.It is known that the control of the absorption of sounds by walls has made use of various devices comprising passive absorption elements made of porous materials having the property of transforming into heat the sound vibrations they received due to the phenomena of friction to which these materials were subjected because of these vibrations. It is known that the use of such absorbent elements has a certain number of disadvantages, namely in particular their bulk and weight and their ability to absorb sound vibrations only in small areas of the spectrum. It has also been proposed to use rigid wall elements perforated with a series of holes regularly distributed on their surface, these perforated holes having diameters of the order of 5 to 6 mm. It has been found that such absorbent elements have significant drawbacks and in particular a very low efficiency if they were not combined with porous elements.
On a ensuite proposé (Publications Dah-You Maa "Theory and design of microperforated panel sound-absorbing constructions". Scientia Sinica 18(1):55-71 -1975-) de faire appel à des parois percées de perforations de faible diamètre, dénommées "micro-perforations", dont les diamètres sont inférieurs à 2 mm, et préférentiellement supérieurs à 0,1 mm, qui sont réparties de façon régulière sur la surface d'un panneau ou d'une toile absorbante, à des distances déterminées les unes des autres, les parois ayant elles-mêmes une épaisseur déterminée et étant disposées à une distance déterminée de la surface d'une paroi arrière pleine. II a été établi que l'on pouvait déterminer une impédance acoustique _Z de l'ensemble constitué de la toile et du volume d'air compris entre celle-ci et la paroi arrière pleine de sorte que l'on a : (impédance de la toile)It was then proposed (Publications Dah-You Maa "Theory and design of microperforated panel sound-absorbing constructions" Scientia Sinica 18 (1): 55-71 -1975-) to use walls pierced with small diameter perforations, referred to as "micro-perforations", whose diameters are less than 2 mm, and preferably greater than 0.1 mm, which are evenly distributed on the surface of a panel or an absorbent fabric, determined distances from each other, the walls themselves having a predetermined thickness and being disposed at a determined distance from the surface of a solid rear wall. It has been established that it is possible to determine an acoustic impedance Z of the assembly consisting of the fabric and the volume of air between it and the solid back wall so that: (impedance of the canvas)
Zair= -j cot(coD /cocos(θ) (impédance de l'air)Z a i r = -j cot (coD / cocos (θ) (impedance of the air)
Z(θ) = Zair(θ) + Zmpp cosθZ (θ) = Z air (θ) + Z mpp cosθ
On obtient ainsi le coefficient d'absorption α(θ) c'est-à- dire l'impédance pour un panneau d'incidence θ déterminé :This gives the absorption coefficient α (θ), that is to say the impedance for a panel of incidence θ determined:
α(θ)= 4Re{Z(θ)} / [l+Re{ZMPA(θ)}]2 + [lm{Z (θ) } ] 2 et de façon statistique en intégrant la valeur de α(θ) on obtient l'absorption globale d'un panneau, à savoir:α (θ) = 4Re {Z (θ)} / [l + Re {Z MPA (θ)}] 2 + [lm {Z (θ)}] 2 and statistically integrating the value of α (θ) we obtain the overall absorption of a panel, namely:
(Xglcbale = Jo ° OC ( θ ) . s in 2θ . dθ ( Xglcbale = Jo OC (θ). S in 2θ. Dθ
On a ainsi été établi que le spectre d'absorption, c'est-à-dire la courbe représentant la variation de l'absorption de la paroi αgiobaie en fonction de la fréquence sonore émise est liée au diamètre des micro-perforations, et que, tous les paramètres étant égaux par ailleurs, l'absorption cigiohaie était meilleure dans les hautes fréquences lorsque les diamètres des micro-perforations étaient plus importants. A l'inverse, pour des microperforations de plus faible diamètre l'absorption était améliorée dans les basses fréquences.It has thus been established that the absorption spectrum, that is to say the curve representing the variation of the absorption of the wall α g iobai e as a function of the sound frequency emitted is related to the diameter of the micro-perforations , and that, all the parameters being equal elsewhere, the cigiohaie absorption was better in the high frequencies when the diameters of the micro-perforations were greater. Conversely, for microperforations of smaller diameter absorption was improved in the low frequencies.
La présente invention a pour but de proposer un ensemble acoustique permettant d'élargir la bande d'absorption acoustique efficace d'un ensemble acoustique faisant appel à une ou plusieurs parois percées de microperforations, cet ensemble acoustique étant destiné à constituer par exemple une fausse paroi d'une pièce c'est- à-dire une cloison ou un plafond, mais également un revêtement intérieur d'un véhicule etc..The present invention aims to provide an acoustic assembly for expanding the effective acoustic absorption band of an acoustic assembly using one or more walls pierced with microperforations, this acoustic assembly being intended to constitute for example a false wall of a room that is to say a partition or a ceiling, but also a lining of a vehicle etc. ..
La présente invention a ainsi pour objet un ensemble absorbant acoustique destiné à constituer, à l'intérieur d'une enceinte, au moins un élément de paroi, cet ensemble comportant au moins un support pourvu de micro-perforations dont le diamètre est inférieur à 2mm, caractérisé en ce que:The present invention thus relates to an acoustic absorbent assembly intended to constitute, within an enclosure, at least one wall element, this assembly comprising at least one support provided with micro-perforations whose diameter is less than 2 mm. characterized in that
- le support s'étend sensiblement parallèlement à une paroi adjacente,the support extends substantially parallel to an adjacent wall,
- l'ensemble acoustique comprend au moins deux séries de micro-perforations se distribuant sur ledit support. Suivant l'invention les micro-perforations pourront se distribuer sur un ou sur plusieurs supports. Ainsi, lorsque l'ensemble absorbant ne comportera qu'un seul support, les séries de micro-perforations auront des surfaces respectives différentes et, lorsque cet ensemble absorbant aura plusieurs supports les séries de micro-perforations pourront être soit identiques sur les deux supports, soit identiques sur chaque support mais différentes d'un support à l'autre, soit différentes sur chacun des supports.the acoustic assembly comprises at least two sets of micro-perforations distributing on said support. According to the invention the micro-perforations may be distributed on one or more supports. Thus, when the absorbent assembly will comprise only one support, the series of micro-perforations will have respective different surfaces and, when this absorbent assembly will have several supports, the series of micro-perforations may be identical on the two supports, are identical on each support but different from one medium to another, or different on each of the supports.
Ainsi, dans un premier mode de mise en œuvre de l'invention, l'ensemble acoustique pourra être constitué d'une paroi unique (paroi rigide ou toile tendue) pourvue d'au moins deux séries d'orifices de surfaces différentes qui se distribuent de façon régulière sur la surface de la paroi en formant des maillages respectifs soit de forme carrée soit de forme triangulaire.Thus, in a first mode of implementation of the invention, the acoustic assembly may consist of a single wall (rigid wall or stretched fabric) provided with at least two sets of orifices of different surfaces that are distributed in a regular manner on the surface of the wall, forming respective meshes either of square shape or of triangular shape.
Préférentiellement les supports de l'ensemble acoustique suivant l'invention seront constitués de nappes tendues, notamment constituées de films en polychlorure de vinyle (PVC), dont l'épaisseur sera préférentiellement comprise -A -Preferably, the supports of the acoustic assembly according to the invention will consist of stretched sheets, in particular made of polyvinyl chloride (PVC) films, the thickness of which will preferably be comprised -AT -
entre 0,1 et 0,3 mm, mais pourront également être formés d'éléments rigides.between 0.1 and 0.3 mm, but may also be formed of rigid elements.
Lorsque, suivant l'invention, l'ensemble acoustique sera constitué de deux parois, et lorsque les micro-perforations de chacune de ces parois auront des surfaces différentes, la paroi pourvue des micro-perforation de plus petite surface sera située du côté de la paroi pleine.When, according to the invention, the acoustic assembly will consist of two walls, and when the micro-perforations of each of these walls will have different surfaces, the wall provided with micro-perforation of smaller surface will be located on the side of the wall. solid wall.
L'ensemble acoustique pourra également bien entendu être constitué d'au moins deux parois parallèles planes ou non comportant chacune une association de deux séries de microperforations, de surfaces différentes.The acoustic assembly may also of course be constituted by at least two parallel flat or non-planar walls each comprising a combination of two series of microperforations, of different surfaces.
Préférentiellement les micro-perforations seront de forme circulaire et se distribueront préférentiellement suivant un maillage de forme carrée ou rectangulaire. On décrira ci-après, à titre d'exemple non limitatif, une forme d'exécution de la présente invention, en référence au dessin annexé sur lequel :Preferentially, the micro-perforations will be circular in shape and will preferably be distributed in a square or rectangular mesh. An embodiment of the present invention will be described hereinafter by way of nonlimiting example, with reference to the appended drawing in which:
La figure 1 est une vue partielle schématique en perspective d'une toile micro-perforée suivant l'état antérieur de la technique qui est mise en œuvre ainsi que représenté sur la figure 2,FIG. 1 is a schematic partial perspective view of a micro-perforated fabric according to the prior art which is implemented as shown in FIG. 2,
La figure 2 est un dessin schématique en coupe verticale d'un exemple de disposition d'une toile tendue micro-perforée par rapport à un plafond, La figure 3 est un graphique représentant la variation de l'absorption sonore d'une toile micro-perforée du type de celle représentée sur la figure 1 mise en œuvre suivant la figure 2, en fonction de la fréquence sonore,FIG. 2 is a schematic vertical sectional drawing of an example of an arrangement of a micro-perforated stretched fabric with respect to a ceiling, FIG. 3 is a graph showing the variation of the sound absorption of a micro-perforated fabric. perforated of the type shown in Figure 1 implemented according to Figure 2, depending on the sound frequency,
La figure 4 est une vue partielle schématique en perspective d'une toile micro-perforée suivant l'état antérieur de la technique et comportant des microperforations et des écartements plus importants que dans le mode de mise en œuvre représenté sur la figure 1. La figure 5 est un graphique représentant la variation de l'absorption sonore d'une toile micro-perforée du type de celle représentée sur la figure 4 mise en œuvre suivant la figure 2, en fonction de la fréquence sonore, Les figures 6a et 6b sont des vue partielles schématiques en plan d'une toile micro-perforée suivant l'invention qui est pourvue d'orifices de même types que ceux représentés respectivement sur les figures 1 et 4, respectivement avec un maillage carré et un maillage triangulaire.FIG. 4 is a schematic partial perspective view of a micro-perforated fabric according to the prior art and comprising larger microperforations and spacings than in the embodiment shown in FIG. 1. FIG. 5 is a graph showing the variation of the sound absorption of a micro-perforated fabric of the type represented in FIG. 4 implemented according to FIG. 2, as a function of the sound frequency, FIGS. 6a and 6b are partial diagrammatic plan views of a micro-perforated fabric according to the invention which is provided with orifices of the same types as those respectively shown in Figures 1 and 4, respectively with a square mesh and a triangular mesh.
La figure 7 est un graphique représentant la variation de l'absorption sonore d'un ensemble acoustique suivant l'invention constitué d'une toile micro-perforée du type de celle représentée sur les figures 6a et 6b mise en œuvre dans une réalisation suivant la figure 1, en fonction de la fréquence sonore.FIG. 7 is a graph showing the variation of the sound absorption of an acoustic assembly according to the invention consisting of a micro-perforated cloth of the type of that represented in FIGS. 6a and 6b implemented in an embodiment according to FIG. Figure 1, depending on the sound frequency.
La figure 8 est un dessin schématique en coupe verticale d'un exemple de disposition de deux toiles micro- perforées par rapport à un plafond, La figure 9 est un graphique représentant la variation de l'absorption sonore d'un ensemble acoustique suivant l'invention constitué de deux toiles micro-perforées superposées et identiques.FIG. 8 is a schematic vertical sectional drawing of an example of an arrangement of two micro-perforated canvases with respect to a ceiling, FIG. 9 is a graph showing the variation of the sound absorption of an acoustic assembly according to FIG. invention consisting of two micro-perforated superimposed and identical fabrics.
La figure 10 est un graphique représentant la variation de l'absorption sonore d'un ensemble acoustique suivant l'invention constitué de deux toiles micro-perforées superposées, dont le diamètre et l'écartement des microperforations sont différents.FIG. 10 is a graph showing the variation of the sound absorption of an acoustic assembly according to the invention consisting of two superimposed micro-perforated canvases, the diameter and the spacing of the microperforations being different.
On a représenté sur la figure 1 une toile 3 qui est pourvue de micro-perforations di qui sont régulièrement réparties, sur toute sa surface. Ces perforations, qui sont de forme circulaire, ont un diamètre de 0,2 mm et sont espacées les unes des autres d'une distance bi de 2 mm. Ainsi que représenté sur la figure 2, cette toile 3 est tendue parallèlement à un plafond 1 d'une pièce à une distance O de celui-ci égale à 100 mm.FIG. 1 shows a fabric 3 which is provided with micro-perforations di which are evenly distributed over its entire surface. These perforations, which are circular in shape, have a diameter of 0.2 mm and are spaced from each other by a distance of 2 mm bi. As shown in FIG. 2, this fabric 3 is stretched parallel to a ceiling 1 of a room at a distance O thereof equal to 100 mm.
On a représenté sur la figure 3 un schéma montrant le spectre d'absorption obtenu par l'ensemble acoustique ainsi constitué en fonction de la fréquence sonore appliquée. On constate ainsi sur cette figure que le maximum d'absorption de cet ensemble se situe à une fréquence de l'ordre de 900FIG. 3 shows a diagram showing the absorption spectrum obtained by the acoustic assembly thus constituted as a function of the sound frequency applied. It can thus be seen in this figure that the maximum absorption of this set is at a frequency of the order of 900
Hz et que pour une absorption de 0,5 celle-ci s'étend d'une fréquence d'environ 350 Hz jusqu'à environ 2.700 Hz, soit environ un intervalle de fréquence de l'ordre de 2.350 Hz.Hz and that for an absorption of 0.5 it extends from a frequency of about 350 Hz to about 2.700 Hz, or about a frequency interval of the order of 2.350 Hz.
De même on a représenté sur la figure 5 le spectre d'absorption d'un ensemble acoustique comprenant une toile de nature et d'épaisseur identique à la précédente et qui est pourvue de micro-perforations de 0,5 mm de diamètre qui sont espacées les unes des autres d'une distance 12 égale à 14 mm et qui, comme la première, est disposée à une distance du plafond 1 égale à 100 mm, en fonction de la fréquence, et l'on constate que sur celle-ci le maximum d'absorption se situe à une fréquence voisine de 300 Hz et que pour une absorption de 0,5 celle-ci s'étend d'une fréquence d'environ 170 Hz jusqu'à environ 500 Hz, soit environ un intervalle de fréquence de l'ordre de 330 Hz.Similarly, FIG. 5 shows the absorption spectrum of an acoustic assembly comprising a fabric of a nature and thickness identical to the preceding one and which is provided with micro-perforations of 0.5 mm in diameter which are spaced apart. each other by a distance equal to 14 mm and which, like the first, is arranged at a distance from the ceiling 1 equal to 100 mm, depending on the frequency, and it is found that on this one the absorption maximum is at a frequency close to 300 Hz and for an absorption of 0.5 it extends from a frequency of about 170 Hz to about 500 Hz, or about a frequency interval of the order of 330 Hz.
On a représenté sur les figures 6a et 6b un ensemble absorbant acoustique réalisé suivant l'invention et qui est constitué d'une paroi unique 3 formée d'une toile en polychlorure de vinyle (PVC) de faible épaisseur (0,17 mm) destinée à constituer un faux plafond d'une pièce et qui, à cet effet, est tendue à une distance D de 100 mm sous le vrai plafond 1 de celle-ci ainsi que représenté sur la figure 1. On a réalisé au travers de cette toile 3 deux séries de micro-perforations, qui se distribuent de façon régulière sur la totalité de sa surface, à savoir d'une part des perforations di dont le diamètre est de 0,2mm et qui se répartissent suivant un maillage de forme carrée (figure 6a) ou triangulaire (figure 6b) et d'autre part des perfσrations d2 de diamètre 0,5mm, ces perforations étant disposées à des distances respectives de leurs homologues de 2mm et 14mm.FIGS. 6a and 6b show an acoustic absorbent assembly produced according to the invention and which consists of a single wall 3 formed of a thin polyvinyl chloride (PVC) cloth (0.17 mm) intended to to constitute a false ceiling of a room and which, for this purpose, is stretched at a distance D of 100 mm under the true ceiling 1 thereof as shown in Figure 1. It was realized through this canvas Two sets of micro-perforations, which are evenly distributed over its entire surface, namely on the one hand di perforations whose diameter is 0.2 mm and which are distributed in a square-shaped mesh (FIG. 6a) or triangular (Figure 6b) and on the other hand perforations d 2 with a diameter of 0.5 mm, these perforations being arranged at respective distances from their homologs of 2 mm and 14 mm.
On a représenté sur la figure 7 la courbe représentant l'absorption de cet ensemble acoustique. On constate sur cette figure que, si l'on prend en compte une absorption de l'ordre de 0,5, celle-ci s'étend d'une fréquence d'environ 180 Hz jusqu'à environ 3.000 Hz, soit environ un intervalle de fréquence de l'ordre de 2.800 Hz alors que cet intervalle de fréquence était seulement de 1.600 Hz pour le premier ensemble acoustique mettant en œuvre des perforations de 0,2 mm et d'environ 330 Hz pour le second ensemble acoustique mettant en œuvre des perforations de 0, 5 mm. La présente invention permet donc bien d'étendre de façon substantielle la largeur du spectre sonore pour lequel l'absorption obtenue est efficace.FIG. 7 shows the curve representing the absorption of this acoustic assembly. It can be seen from this figure that, if an absorption of the order of 0.5 is taken into account, it extends from a frequency of approximately 180 Hz to approximately 3,000 Hz, ie approximately one frequency range of the order of 2,800 Hz, whereas this frequency interval was only 1,600 Hz for the first acoustic assembly implementing perforations of 0.2 mm and about 330 Hz for the second acoustic assembly implementing perforations of 0, 5 mm. The present invention therefore makes it possible to substantially extend the width of the sound spectrum for which the absorption obtained is effective.
Dans un autre mode de mise en œuvre de l'invention, représenté sur la figure 8, les micro-perforations se distribuent sur deux toiles 3a et 3b de même épaisseur égale à 0,17 mm qui sont parallèles entre elles et à la paroi pleine formée par le plafond 1. Suivant l'invention la première toile 3a est disposée à une distance Di du plafond 1 égale à 80 mm et est percée de micro-perforations de 2 mm de diamètre qui se répartissent uniformément sur celle-ci et qui forment un maillage de forme triangulaire, et la seconde toile 3b est disposée sous la première à une distance D2 de celle-ci égale à 20 mm et est percée de micro-perforations également de 2 mm de diamètre qui se répartissent comme les précédentes.In another embodiment of the invention, shown in FIG. 8, the micro-perforations are distributed on two webs 3a and 3b of the same thickness equal to 0.17 mm which are parallel to each other and to the solid wall. formed by the ceiling 1. According to the invention the first fabric 3a is disposed at a distance Di from the ceiling 1 equal to 80 mm and is pierced with micro-perforations 2 mm in diameter which are distributed uniformly thereon and which form a mesh of triangular shape, and the second fabric 3b is disposed under the first at a distance D 2 thereof equal to 20 mm and is pierced with micro-perforations also 2 mm in diameter which are distributed as the previous ones.
On a représenté sur la figure 9 le spectre d'absorption acoustique d'un tel ensemble. On constate également qu'une telle disposition permet d' obtenir une absorption α conséquente de 0,5 dans un domaine de fréquences s'étendant d' environ 300 Hz jusqu'à 5000 Hz, soit sur une plage de fréquences de l'ordre de 4700 Hz.FIG. 9 shows the acoustic absorption spectrum of such an assembly. It can also be seen that such an arrangement makes it possible to obtain a consequent absorption α of 0.5 in a range of frequencies extending from about 300 Hz up to 5000 Hz, or over a frequency range of about 4700 Hz.
Dans un autre mode de mise en œuvre de l'invention l'ensemble acoustique est également constitué de deux toiles 3a et 3b de mêmes épaisseurs respectives et qui sont disposées ainsi que précédemment. La première toile 3a est uniformément perforée par des trous de 0,2 mm de diamètre qui sont répartis de façon uniforme sur sa surface et sont écartés les uns des autres d'une distance de 2 mm. La seconde toile 3b quant à elle est uniformément perforée par des trous plus gros, de 0,5 mm de diamètre, qui sont répartis de façon uniforme sur sa surface et qui sont écartés les uns des autres d'une distance de 14 mm.In another embodiment of the invention the acoustic assembly also consists of two webs 3a and 3b of the same respective thicknesses and which are arranged as before. The first web 3a is uniformly perforated by holes 0.2 mm in diameter which are distributed uniformly over its surface and are separated from each other by a distance of 2 mm. The second fabric 3b is uniformly perforated by larger holes, 0.5 mm in diameter, which are distributed uniformly over its surface and which are separated from each other by a distance of 14 mm.
On a représenté sur la figure 10 le spectre d'absorption acoustique d'un tel ensemble. On constate qu'une telle disposition permet d'obtenir une absorption ce conséquente de 0,5 dans un domaine de fréquences s' étendant d'environ 150 Hz à 5000 Hz soit sur une plage de fréquences de l'ordre de 4850 Hz. La présente invention permet bien ainsi d'étendre l'intervalle des fréquences qui sont absorbées par des parois minces pourvues de micro-perforations.FIG. 10 shows the acoustic absorption spectrum of such an assembly. It can be seen that such an arrangement makes it possible to obtain a consequent absorption of 0.5 in a frequency range extending from about 150 Hz to 5000 Hz, ie over a frequency range of the order of 4850 Hz. The present invention thus makes it possible to extend the range of frequencies that are absorbed by thin walls provided with micro-perforations.
On pourrait également bien entendu suivant l'invention réaliser un ensemble acoustique à deux parois superposées dont chacune comporte des micro-perforations de diamètres différents . One could also of course according to the invention realize an acoustic assembly with two superimposed walls each of which has micro-perforations of different diameters.

Claims

RESVENDICATIONS RESVENDICATIONS
1.- Ensemble absorbant acoustique destiné à constituer, à l'intérieur d'une enceinte, au moins un élément de paroi, cet ensemble comportant au moins un support pourvu de microperforations dont le diamètre est inférieur à 2mm, caractérisé en ce que:1.- Acoustic absorbing assembly intended to constitute, within an enclosure, at least one wall element, this assembly comprising at least one support provided with microperforations whose diameter is less than 2 mm, characterized in that:
- le support (3, 3a, 3b) s'étend sensiblement parallèlement à une paroi adjacente (1), - l'ensemble acoustique comprend au moins deux séries de micro-perforations (di,d2) se distribuant sur ledit support (3, 3a, 3b)the support (3, 3a, 3b) extends substantially parallel to an adjacent wall (1), the acoustic assembly comprises at least two series of micro-perforations (di, d2) distributed on said support (3, 3a, 3b)
2.- Ensemble acoustique suivant la revendication 1, caractérisé en ce que ladite paroi adjacente est une paroi pleine.2. The acoustic assembly of claim 1, characterized in that said adjacent wall is a solid wall.
3.- Ensemble acoustique suivant l'une des revendications 1 ou 2 caractérisé en ce que les séries de microperforations (di,d2) ont des surfaces différentes et se distribuent sur un seul support (3) . 3.- acoustic assembly according to one of claims 1 or 2 characterized in that the series of microperforations (di, d 2 ) have different surfaces and are distributed on a single support (3).
4.- Ensemble acoustique suivant l'une des revendications 1 ou 2, caractérisé en ce que les séries de microperforations (di,d2) se distribuent sur au moins deux supports (3a, 3b).4.- acoustic assembly according to one of claims 1 or 2, characterized in that the series of microperforations (di, d2) are distributed over at least two supports (3a, 3b).
5.- Ensemble acoustique suivant la revendication 4 caractérisé en ce que les micro-perforations (di) ont des surfaces identiques.5.- acoustic assembly according to claim 4 characterized in that the micro-perforations (di) have identical surfaces.
6.~ Ensemble acoustique suivant l'une des revendications précédentes caractérisé en ce que le support est constitué d'une nappe tendue (3, 3a, 3b). 6. ~ acoustic assembly according to one of the preceding claims characterized in that the support consists of a stretched web (3, 3a, 3b).
7.- Ensemble acoustique suivant l'une des revendications 1 à 5, caractérisé en ce que le support est constitué d'un élément rigide. 7.- acoustic assembly according to one of claims 1 to 5, characterized in that the support consists of a rigid element.
8.- Ensemble acoustique suivant l'une des revendications 4 à 6 caractérisé en ce que les supports (3a, 3b) sont parallèles .8.- acoustic assembly according to one of claims 4 to 6 characterized in that the supports (3a, 3b) are parallel.
9.- Ensemble acoustique suivant la revendication 3 caractérisé en ce que les micro-perforations (d2) de plus grande surface se distribuent sur le support suivant un maillage de forme carrée ou rectangulaire.9. An acoustic assembly according to claim 3 characterized in that the micro-perforations (d2) of larger area are distributed on the support in a mesh of square or rectangular shape.
10.- Ensemble acoustique suivant la revendication 3 caractérisé en ce que les micro-perforations (di) de plus petite surface se distribuent sur le seul support suivant un maillage de forme carrée ou triangulaire. 10. An acoustic assembly according to claim 3 characterized in that the micro-perforations (di) of smaller area are distributed on the single support in a mesh of square or triangular shape.
EP06794322A 2006-08-10 2006-08-10 Sound-absorbing assembly Active EP2054562B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FR2006/001940 WO2008017737A1 (en) 2006-08-10 2006-08-10 Sound-absorbing assembly

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EP2054562A1 true EP2054562A1 (en) 2009-05-06
EP2054562B1 EP2054562B1 (en) 2013-02-13

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Publication number Priority date Publication date Assignee Title
FR2970009B1 (en) * 2010-12-30 2021-06-11 Normalu ACOUSTICALLY ABSORBENT PACKAGE
FR3000509B1 (en) * 2012-12-31 2015-01-16 Jean-Marc Scherrer SEALED AND ACOUSTICALLY ABSORBENT ASSEMBLY FOR FALSE WALL
FR3018384B1 (en) * 2014-03-04 2016-03-11 Scherrer Jean Marc ACOUSTIC ABSORPTION ASSEMBLY WITH HIGH AND LOW FREQUENCIES
US11608291B2 (en) 2016-11-04 2023-03-21 Corning Incorporated Micro-perforated panel systems, applications, and methods of making micro-perforated panel systems
US20220148550A1 (en) * 2019-03-04 2022-05-12 Corning Incorporated Micro-perforated panel systems, applications, and methods of making micro-perforated panel systems

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FR1090617A (en) 1953-09-29 1955-04-01 Fibrociment Et Des Revetements Improvements in coating materials for sound absorption
DE1738778U (en) * 1954-11-13 1957-01-31 Acieroid Fa SELF-SUPPORTING PANEL FOR ROOFS.
DE9320543U1 (en) 1993-04-20 1994-11-03 Fraunhofer Ges Forschung Sound absorbing component
DE4315759C1 (en) * 1993-05-11 1994-05-05 Fraunhofer Ges Forschung Sound-absorbent glazing for building - comprises perforated plate with small-diameter holes close together
US5700727A (en) 1995-07-24 1997-12-23 Micron Technology, Inc. Method of forming a thin film transistor
EP0816483A1 (en) 1996-06-27 1998-01-07 The Procter & Gamble Company Granular bleaching compositions
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DK2054562T3 (en) 2013-05-27
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