EP1750250A1 - Air-space type acoustic board - Google Patents

Air-space type acoustic board Download PDF

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Publication number
EP1750250A1
EP1750250A1 EP06291186A EP06291186A EP1750250A1 EP 1750250 A1 EP1750250 A1 EP 1750250A1 EP 06291186 A EP06291186 A EP 06291186A EP 06291186 A EP06291186 A EP 06291186A EP 1750250 A1 EP1750250 A1 EP 1750250A1
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EP
European Patent Office
Prior art keywords
acoustic panel
panel according
plates
spacer
central plate
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.)
Withdrawn
Application number
EP06291186A
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German (de)
French (fr)
Inventor
Michel Pompei
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.)
Hutchinson SA
Original Assignee
Hutchinson SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hutchinson SA filed Critical Hutchinson SA
Publication of EP1750250A1 publication Critical patent/EP1750250A1/en
Withdrawn legal-status Critical Current

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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
    • G10K11/162—Selection of materials
    • G10K11/168—Plural layers of different materials, e.g. sandwiches

Definitions

  • the present invention relates to an acoustic panel type air knife in which a spacer (or more spacers) maintains separate two plates (or more plates).
  • the problem is to have a spacer whose mass is reduced and which has sufficient mechanical strength to ensure a good separation of the walls while having a reduced contact surface with the plates to minimize acoustic and possibly thermal transfers between the plaques.
  • the embossing may be inclined, for example 45 °, with respect to two opposite edges of the spacer.
  • the embossing can be advantageously carried out in two dimensions.
  • the knitted or woven element may be in the form of a sleeve. This can be laid flat so as to have two superimposed embossed thicknesses.
  • the sleeve constituting the knitted or woven element forms a net in which is disposed a said plate, for example a central plate disposed between two external plates, which defines two spacers and two blades of air.
  • the knitted or woven element is advantageously an embossed fabric of metal wire, in particular of aluminum.
  • the central plate is constituted by a foam, preferably a melamine foam and / or by the low density wool in an aramid fiber casing.
  • the two outer plates may be an epoxy / fiberglass composite.
  • the acoustic panel shown in Figure 1 comprises a central panel 1 of melamine foam, for example 5 mm thick, and two outer plates 2 and 3 epoxy composite / glass fiber 5 ply.
  • the spacers 4 and 5 are formed of an embossed knit of aluminum wire. This is a laminated thread of diameter 0.37 mm which is then knitted and then embossed so as to give it a thickness for example of 2 to 4 mm.
  • the acoustic panel thus formed has a total thickness of about 15 mm.
  • Figure 2 shows a detail view of the embossed knit.
  • the shape of the mesh is not important: it is the embossing that minimizes the contact between the outer plate 2 or 3 and the central plate 1 which provides sound insulation. Indeed, the corrugations that constitute the embossing effect an almost point contact between the wire and the plates.
  • the material constituting the knit or the fabric is chosen according to the particular environmental constraints of the application envisaged, but the material must be such as to allow a mechanical deformation to cold or hot.
  • a knit thus produced makes it possible to ensure good spacing of the walls while the spacer remains flexible enough to follow the possible rounded contours of the acoustic panel.
  • Aluminum also has the combined advantage of good rigidity for a relatively low mass, as well as flammability.
  • the spacer according to the invention avoids the contact between the inner walls of the plates 2 and 3 and the walls of the central panel.
  • a metal and in particular of a thin mesh (for example, the order of a few mm), allows resistance to a non-rasping incidence flame.
  • the knit or embossed fabric may be glued to one or both of the plates it separates. It is also possible not to perform bonding, in which case the sandwich can be held on the periphery of the outer plates 2 and 3.
  • the central plate 1 may be a block of acoustic foam (eg polyurethane foam).
  • the central plate 1 can also be made of a particularly low density glass wool, optionally contained in a thin envelope of aramid fibers ("Mylar").
  • FIG. 3 is a TL damping test expressed in dB on the ordinate as a function of the frequency (expressed in Hertz) as abscissa.
  • Curve A illustrates the case of the panel of FIG. 1 (outer plates 2 and 3, made of epoxy / fiberglass composite, central plate 1 made of melamine foam and spacers 4 and 5 made of embossed knit of aluminum wire), while that the curve B illustrates the case of the panel of Figure 1, but in the absence of spacer (panels 1, 2 and 3 coming edge to edge).
  • the acoustic panel shown in Figure 1 (outer plates 2 and 3 made of epoxy / fiberglass composite, central plate 1 of melamine foam, and spacers 4 and 5 embossed knit of aluminum wire), allows to pass the test FA 25-863 (application for 12 s of a flame on the edge of the panel).
  • Melamine foam has a very good fire resistance, as well as the fiberglass / epoxy composite and the embossed knit of aluminum wire, and the blades of air on both sides promote cooling.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Laminated Bodies (AREA)
  • Building Environments (AREA)

Abstract

The panel has a central plate (1) made of melamine foam, and outer plates (2, 3) spaced apart by spacers (4, 5) to form air sheets. The spacers are constituted by a knitted element which is an embossed aluminum wire knit. The embossing is inclined at 45 degrees with respect to two opposite edges of the spacers. The outer plates (2, 3) can be made of glass fiber/epoxy composite.

Description

La présente invention a pour objet un panneau acoustique du type à lame d'air dans lequel un écarteur (ou plusieurs écarteurs) maintient séparées deux plaques (ou plusieurs plaques).The present invention relates to an acoustic panel type air knife in which a spacer (or more spacers) maintains separate two plates (or more plates).

Il est connu que l'efficacité d'un absorbant tel qu'un matériau poreux est accrue si une lame d'air est créée notamment entre celui-ci et la paroi qui reçoit une excitation acoustique.It is known that the effectiveness of an absorbent such as a porous material is increased if an air gap is created especially between it and the wall that receives an acoustic excitation.

Le problème posé est de disposer d'un écarteur dont la masse soit réduite et qui ait suffisamment de tenue mécanique pour assurer un bon écartement des parois tout en présentant une surface de contact réduite avec les plaques afin de minimiser les transferts acoustiques et éventuellement thermiques entre les plaques.The problem is to have a spacer whose mass is reduced and which has sufficient mechanical strength to ensure a good separation of the walls while having a reduced contact surface with the plates to minimize acoustic and possibly thermal transfers between the plaques.

L'invention concerne ainsi un panneau acoustique présentant au moins deux plaques, ainsi qu'au moins un écarteur pour maintenir séparées lesdites deux plaques pour former au moins une lame d'air, caractérisé en ce que ledit écarteur est constitué par un élément tricoté ou tissé qui présente un gaufrage.The invention thus relates to an acoustic panel having at least two plates, and at least one spacer for keeping said two plates separate to form at least one air gap, characterized in that said spacer is constituted by a knitted element or woven which has an embossing.

Le gaufrage peut être incliné, par exemple 45°, par rapport à deux bords opposés de l'écarteur.The embossing may be inclined, for example 45 °, with respect to two opposite edges of the spacer.

Le gaufrage peut être avantageusement réalisé selon-deux dimensions.The embossing can be advantageously carried out in two dimensions.

L'élément tricoté ou tissé peut se présenter sous la forme d'un manchon. Celui-ci peut être mis à plat de manière à présenter deux épaisseurs gaufrées superposées. Alternativement le manchon qui constitue l'élément tricoté ou tissé forme un filet dans lequel est disposé une dite plaque, par exemple une plaque centrale disposée entre deux plaques externes, ce qui définit deux écarteurs et deux lames d'air.The knitted or woven element may be in the form of a sleeve. This can be laid flat so as to have two superimposed embossed thicknesses. Alternatively, the sleeve constituting the knitted or woven element forms a net in which is disposed a said plate, for example a central plate disposed between two external plates, which defines two spacers and two blades of air.

L'élément tricoté ou tissé est avantageusement un tissu gaufré de fil métallique, notamment en aluminium.The knitted or woven element is advantageously an embossed fabric of metal wire, in particular of aluminum.

Dans le cas où le panneau acoustique se caractérise par la présence d'une plaque centrale et deux plaques externes séparées par lesdits écarteur, il est avantageux que la plaque centrale soit constituée par une mousse, de préférence une mousse de mélamine et/ou par de la laine de faible densité dans une enveloppe en fibre aramide.In the case where the acoustic panel is characterized by the presence of a central plate and two external plates separated by said spacer, it is advantageous that the central plate is constituted by a foam, preferably a melamine foam and / or by the low density wool in an aramid fiber casing.

Les deux plaques externes peuvent être en un composite epoxy/fibre de verre.The two outer plates may be an epoxy / fiberglass composite.

D'autres caractéristiques et avantages de l'invention apparaîtront mieux à la lecture de la description ci-après, en liaison avec les dessins dans lesquels :

  • les figures 1 et 2 représentent respectivement une vue en coupe d'un panneau acoustique selon un mode de réalisation de l'invention et une vue d'un écarteur selon un mode de réalisation de l'invention.
  • la figure 3 illustre l'avantage apporté par le dispositif écarteur par rapport à un panneau sans lame d'air.
Other features and advantages of the invention will appear better on reading the description below, in conjunction with the drawings in which:
  • Figures 1 and 2 respectively show a sectional view of an acoustic panel according to one embodiment of the invention and a view of a spacer according to one embodiment of the invention.
  • Figure 3 illustrates the advantage of the spacer device over a panel without an air gap.

Le panneau acoustique représenté à la figure 1 comporte un panneau central 1 en mousse de mélamine, par exemple de 5 mm d'épaisseur, et deux plaques externes 2 et 3 en composite époxy/fibres de verre 5 plis. Les écarteurs 4 et 5 sont formés d'un tricot gaufré de fil d'aluminium. Il s'agit ici d'un fil laminé de diamètre 0,37 mm qui est ensuite tricoté, puis gaufré de manière à lui conférer une épaisseur par exemple de 2 à 4 mm.The acoustic panel shown in Figure 1 comprises a central panel 1 of melamine foam, for example 5 mm thick, and two outer plates 2 and 3 epoxy composite / glass fiber 5 ply. The spacers 4 and 5 are formed of an embossed knit of aluminum wire. This is a laminated thread of diameter 0.37 mm which is then knitted and then embossed so as to give it a thickness for example of 2 to 4 mm.

Le panneau acoustique ainsi constitué présente une épaisseur totale de 15 mm environ.The acoustic panel thus formed has a total thickness of about 15 mm.

La figure 2 représente une vue de détail du tricot gaufré. La forme de la maille n'est pas importante : c'est le gaufrage qui permet de minimiser le contact entre la plaque externe 2 ou 3 et la plaque centrale 1 qui apporte l'isolation acoustique. En effet, les ondulations qui constituent le gaufrage ont pour effet un contact quasi ponctuel entre le fil et les plaques.Figure 2 shows a detail view of the embossed knit. The shape of the mesh is not important: it is the embossing that minimizes the contact between the outer plate 2 or 3 and the central plate 1 which provides sound insulation. Indeed, the corrugations that constitute the embossing effect an almost point contact between the wire and the plates.

Le matériau constituant le tricot ou le tissu est choisi en fonction des contraintes notamment d'environnement de l'application envisagée, mais le matériau doit être de nature à permettre une déformation mécanique à froid ou à chaud. On pourra choisir par exemple un matériau métallique ou bien un matériau plastique, notamment thermoplastique.The material constituting the knit or the fabric is chosen according to the particular environmental constraints of the application envisaged, but the material must be such as to allow a mechanical deformation to cold or hot. We can choose for example a metal material or a plastic material, especially thermoplastic.

Un tricot ainsi réalisé permet d'assurer un bon écartement des parois alors que l'écarteur reste suffisamment souple pour suivre les contours arrondis éventuels du panneau acoustique.A knit thus produced makes it possible to ensure good spacing of the walls while the spacer remains flexible enough to follow the possible rounded contours of the acoustic panel.

L'aluminium présente de plus l'avantage combiné d'une bonne rigidité pour une masse relativement faible, ainsi que de l'inflammabilité.Aluminum also has the combined advantage of good rigidity for a relatively low mass, as well as flammability.

L'écarteur selon l'invention évite le contact entre les parois internes des plaques 2 et 3 et les parois du panneau central.The spacer according to the invention avoids the contact between the inner walls of the plates 2 and 3 and the walls of the central panel.

La mise en oeuvre d'un métal, et notamment d'une maille fine (par exemple l'ordre de quelques mm), permet une résistance à une flamme d'incidence non rasante.The use of a metal, and in particular of a thin mesh (for example, the order of a few mm), allows resistance to a non-rasping incidence flame.

Le tricot ou le tissu gaufré peut être collé à l'une des deux plaques qu'il sépare ou bien aux deux. Il est également possible de ne pas effectuer de collage, auquel cas le maintien du sandwich peut être réalisé sur le pourtour des plaques externes 2 et 3.The knit or embossed fabric may be glued to one or both of the plates it separates. It is also possible not to perform bonding, in which case the sandwich can be held on the periphery of the outer plates 2 and 3.

En variante, la plaque centrale 1 peut être un bloc de mousse acoustique (par exemple mousse polyuréthane). La plaque centrale 1 peut être aussi réalisée en une laine de verre notamment de faible densité, éventuellement contenue dans une fine enveloppe en fibres aramides ("Mylar").Alternatively, the central plate 1 may be a block of acoustic foam (eg polyurethane foam). The central plate 1 can also be made of a particularly low density glass wool, optionally contained in a thin envelope of aramid fibers ("Mylar").

La figure 3 est un test d'amortissement TL exprimé en dB en ordonnée en fonction de la fréquence (exprimé en Hertz) en abscisse. La courbe A illustre le cas du panneau de la figure 1 (plaques externes 2 et 3, en composite époxy/fibres de verre, plaque centrale 1 en mousse de mélamine et écarteurs 4 et 5 en tricot gaufré de fil d'aluminium), alors que la courbe B illustre le cas du panneau de la figure 1, mais en l'absence d'écarteur (panneau 1, 2 et 3 venant bord à bord).FIG. 3 is a TL damping test expressed in dB on the ordinate as a function of the frequency (expressed in Hertz) as abscissa. Curve A illustrates the case of the panel of FIG. 1 (outer plates 2 and 3, made of epoxy / fiberglass composite, central plate 1 made of melamine foam and spacers 4 and 5 made of embossed knit of aluminum wire), while that the curve B illustrates the case of the panel of Figure 1, but in the absence of spacer (panels 1, 2 and 3 coming edge to edge).

On constate une amélioration de l'amortissement au-delà d'un certaine fréquence (ici 800 Hz) et en particulier la suppression de la région où l'amortissement diminue jusqu'à un point bas situé ici à 2000 Hz.There is an improvement in the damping beyond a certain frequency (here 800 Hz) and in particular the suppression of the region where the damping decreases to a low point located here at 2000 Hz.

Le panneau acoustique illustré à la figure 1 (plaques externes 2 et 3 en composite époxy/fibres de verre, plaque centrale 1 en mousse de mélamine, et écarteurs 4 et 5 en tricot gaufré de fil d'aluminium), permet de passer le test FA 25-863 (application pendant 12 s d'une flamme sur la tranche du panneau). La mousse de mélamine présente une très bonne résistance au feu, de même que le composite fibres de verre/époxy et que le tricot gaufré de fil d'aluminium, et les lames d'air de part et d'autre favorisent le refroidissement.The acoustic panel shown in Figure 1 (outer plates 2 and 3 made of epoxy / fiberglass composite, central plate 1 of melamine foam, and spacers 4 and 5 embossed knit of aluminum wire), allows to pass the test FA 25-863 (application for 12 s of a flame on the edge of the panel). Melamine foam has a very good fire resistance, as well as the fiberglass / epoxy composite and the embossed knit of aluminum wire, and the blades of air on both sides promote cooling.

Claims (10)

Panneau acoustique présentant au moins deux plaques, ainsi qu'au moins un écarteur pour maintenir séparées lesdites deux plaques pour former au moins une lame d'air, caractérisé en ce que ledit écarteur (4, 5) est constitué par un élément tricoté qui est un tricot gaufré de fil métallique.Acoustic panel having at least two plates, and at least one spacer for keeping said two plates separate to form at least one air gap, characterized in that said spacer (4, 5) is constituted by a knitted element which is an embossed knit of wire. Panneau acoustique selon la revendication 1, caractérisé en ce que le fil métallique est en aluminium.Acoustic panel according to claim 1, characterized in that the wire is of aluminum. Panneau acoustique selon une des revendications 1 ou 2, caractérisé en ce que le gaufrage est incliné, par exemple 45°, par rapport à deux bords opposés de l'écarteur.Acoustic panel according to one of claims 1 or 2, characterized in that the embossing is inclined, for example 45 °, with respect to two opposite edges of the spacer. Panneau acoustique selon une des revendications 1 à 3, caractérisé en ce que l'écarteur (4, 5) est gaufré selon deux dimensions.Acoustic panel according to one of claims 1 to 3, characterized in that the spacer (4, 5) is embossed in two dimensions. Panneau acoustique selon une des revendications 1 à 4, caractérisé en ce que l'élément tricoté se présente sous la forme d'un manchon mis à plat de manière à présenter deux épaisseurs gaufrées superposées.Acoustic panel according to one of claims 1 to 4, characterized in that the knitted element is in the form of a sleeve laid flat so as to have two superimposed embossed thicknesses. Panneau acoustique selon une des revendications 1 à 4, caractérisé en ce que l'élément tricoté constitue un filet dans lequel est disposée une dite plaque.Acoustic panel according to one of claims 1 to 4, characterized in that the knitted element constitutes a net in which is disposed a said plate. Panneau acoustique selon une des revendications précédentes, caractérisé en ce qu'il présente une plaque centrale (1) et deux plaques externes (2, 3), la plaque centrale (1) et les deux plaques externes (2, 3) étant maintenues séparées par desdits écarteurs (4, 5).Acoustic panel according to one of the preceding claims, characterized in that it has a central plate (1) and two external plates (2, 3), the central plate (1) and the two outer plates (2, 3) being kept separate by said spacers (4, 5). Panneau acoustique selon la revendication 7, caractérisé en ce que la plaque centrale (1) est en mousse, notamment en mousse de mélamine.Acoustic panel according to claim 7, characterized in that the central plate (1) is made of foam, in particular of melamine foam. Panneau acoustique selon la revendication 7, caractérisé en ce que la plaque centrale (1) est en laine de verre de faible densité dans une enveloppe en fibres aramides.Acoustic panel according to claim 7, characterized in that the central plate (1) is of low density glass wool in an aramid fiber casing. Panneau acoustique selon une des revendications 8 ou 9, caractérisé en ce que les deux plaques externes (2, 3) sont en un composite époxy/fibre de verre.Acoustic panel according to one of claims 8 or 9, characterized in that the two outer plates (2, 3) are made of an epoxy / fiberglass composite.
EP06291186A 2005-08-02 2006-07-21 Air-space type acoustic board Withdrawn EP1750250A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0508264A FR2889616B1 (en) 2005-08-02 2005-08-02 ACOUSTIC PANEL OF TYPE A BLADE OF AIR

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EP1750250A1 true EP1750250A1 (en) 2007-02-07

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EP06291186A Withdrawn EP1750250A1 (en) 2005-08-02 2006-07-21 Air-space type acoustic board

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EP (1) EP1750250A1 (en)
FR (1) FR2889616B1 (en)

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
DE102016118589A1 (en) * 2016-09-30 2018-04-05 Phoncoat Gmbh Soundproof hood for musicians and office workers

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EP0262092A1 (en) * 1986-09-26 1988-03-30 Matec Holding Ag Noise-reducing building element
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FR2889616A1 (en) 2007-02-09
US20070034445A1 (en) 2007-02-15
FR2889616B1 (en) 2008-05-30

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