EP1570139A1 - Double-wall acoustic panel - Google Patents

Double-wall acoustic panel

Info

Publication number
EP1570139A1
EP1570139A1 EP03789519A EP03789519A EP1570139A1 EP 1570139 A1 EP1570139 A1 EP 1570139A1 EP 03789519 A EP03789519 A EP 03789519A EP 03789519 A EP03789519 A EP 03789519A EP 1570139 A1 EP1570139 A1 EP 1570139A1
Authority
EP
European Patent Office
Prior art keywords
acoustic
absorbent
acoustic panel
panel according
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.)
Granted
Application number
EP03789519A
Other languages
German (de)
French (fr)
Other versions
EP1570139B1 (en
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 EP1570139A1 publication Critical patent/EP1570139A1/en
Application granted granted Critical
Publication of EP1570139B1 publication Critical patent/EP1570139B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • E04B1/86—Sound-absorbing elements slab-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
    • E04B1/88—Insulating elements for both heat and sound
    • E04B1/90—Insulating elements for both heat and sound slab-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
    • E04B1/84—Sound-absorbing elements
    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8461—Solid slabs or blocks layered
    • 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
    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8476—Solid slabs or blocks with acoustical cavities, with or without acoustical filling

Definitions

  • the present invention relates to an acoustic panel with two walls between which is arranged an acoustic absorbent.
  • the efficiency of the absorbent can be improved by creating an air space between the acoustic absorbent and the wall which receives the acoustic excitation.
  • the present invention relates to an acoustic panel of the aforementioned type, the structure of which makes it possible to advantageously create this air space.
  • the invention thus relates to an acoustic panel comprising a first and a second wall between which an acoustic absorbent is disposed, characterized in that, the first wall has, on an internal face directed towards the acoustic absorbent, a plate made of a viscoelastic material, as well as a counterplate, spacing elements (for example parallel ridges, honeycombs, embossing, and / or spikes) being distributed in at least one dimension and creating an air space between the absorbent and the counter plate.
  • spacing elements for example parallel ridges, honeycombs, embossing, and / or spikes
  • the spacing elements can form a two-dimensional network, for example a grid or a honeycomb or an embossing, or even pins distributed along these two dimensions.
  • the grid, the honeycomb or the embossing can constitute a net or a bag inside which the acoustic absorbent is placed.
  • the net or the bag may be made of a thermally conductive material so that it constitutes a heat sink between said walls.
  • a self-adhesive film carrying said network (for example grid, honeycomb, embossing and / or spikes) can be stuck on the acoustic absorbent, in particular on a packaging of the acoustic absorbent, or on the backplate.
  • the counterplate is stiffened by an embossing, ribs which may or may not be parallel, a honeycomb, spikes or bosses.
  • the acoustic panel has a first plate 1 which receives the acoustic excitation (arrow F) when the panel is put in place, a second wall 2 and an acoustic absorbent 3, for example glass wool which can be contained in a thin envelope
  • the plate 1 has on its internal face a plate 17 of viscoelastic material (for example the “Deltane” material from the company PAULSTRA).
  • the air gap is produced using a mechanical spacer constituted by a mesh or an embossing 5, which can be secured to a rigid counter plate 10, or else by an embossed counter plate.
  • the shape of the mesh can be any, on the other hand its size must be such that under the action of the pressures which the absorbent undergoes, this one must not exceed the surface defined by the mesh so that it cannot come in contact with the counterplate 10 and that the air knife keeps the desired thickness.
  • the nature of the material constituting the mesh is chosen according to the environmental constraints of the envisaged application. This material can be malleable to allow the mesh to conform to complicated shapes, provided that during deformation and under mounting or operating pressures the absorbent 3 cannot come into contact with the counterplate 10.
  • the mesh 5 defined can be glued to the internal face of the counter plate 10 taking the precaution that the glue does not fill the mesh of the mesh in order to avoid contact with the acoustic absorbent.
  • Absorbent 3 is low density glass wool contained in a thin “Mylar” envelope (registered trademark).
  • the spacer can be a mesh of stainless steel wire 0.5 mm in diameter and whose mesh is a square of 10 mm side.
  • the reduction in transparency is of the order of 3 to 4 dB.
  • the mesh 5 can constitute a net 7 in which the absorbent 3 is placed.
  • the plate 1 has on its internal face a plate of viscoelastic material 17 (for example the "Deltane” material from the company PAULSTRA) and a counter plate 10 which is embossed in order to stiffen it and which serves to dampen the vibrations of the plate 1 subjected to excitation.
  • a plate of viscoelastic material 17 for example the "Deltane” material from the company PAULSTRA
  • This configuration makes it possible to lighten the plywood 10 (and possibly the plate 17) by reducing its thickness while maintaining its stiffness using the inertia of the walls 18 perpendicular to its surface. These serve as spacers to avoid contact of the absorbent with the counterplate ( Figure 9).
  • the counter plate 10 can be constituted by a glued plate 20 carrying grooves 18 in one or two dimensions.
  • the spacers 18 are ribs of the counterplate 10 formed in one dimension and spaced from each other, in general with a constant pitch.
  • the ribs 18 (distributed in one or two dimensions) of the counter plate 10 are sufficiently wide for the plate 17 of viscoelastic material to occupy the hollow part 19 thereof (see in particular the box in FIG. 7 ).
  • An aluminum wall 1 of 1.2 mm thick is absorbed on the one hand by a sheet 17 of visco-elastic material 1 mm thick and on the other hand by a flat aluminum counter-plate 10 of 0 , 5 mm thick.
  • EXAMPLE 2 A wall 1 of aluminum 1.2 mm thick is absorbed on the one hand by a sheet 17 of visco-elastic material 0.5 mm thick and on the other hand by a counter plate 10 of aluminum of 0.3 mm thick embossed with a square mesh of 10 mm side and a rib height of 2 mm (See Figure 6).
  • FIG. 8 illustrates, for an excitation of 0.1 g of an aluminum plate 1 (210 x 230 mm) 1, 2 mm thick, the level of vertical acceleration in m / s 2 as a function of the frequency F (between 0 and 3000 Hz), for: Curve I: said plate 1 only; Curve II: said plate 1 damped by a sheet 17 of visco-elastic material (“Deltane”) 1 mm thick and a flat counter-plate 10 made of aluminum 0.5 mm thick;
  • Deltane visco-elastic material
  • Curve III said plate 1 damped by a sheet 17 of visco-elastic material (“Deltane”) 0.5 mm thick, covered in its center with an aluminum counter-plate 10 (150 mm x 15 mm) 0.3 mm thick embossed with a square mesh of 10 mm side and a rib height of 2 mm.
  • Deltane visco-elastic material

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Building Environments (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

The acoustic panel includes two walls (1,2) between which an acoustic absorber (3), such as glass wool, is disposed. The glass wool may be contained in a fine envelope e.g. formed from Mylar (RTM) material. Spacing elements (5) are disposed between the first wall and the absorber, so as to create a curtain of air between the absorber and the first wall.

Description

PANNEAU ACOUSTIQUE A DOUBLE PAROI. DOUBLE WALL ACOUSTIC PANEL.
La présente invention a pour objet un panneau acoustique à deux parois entre lesquelles est disposé un absorbant acoustique.The present invention relates to an acoustic panel with two walls between which is arranged an acoustic absorbent.
Dans un tel panneau, on peut améliorer l'efficacité de l'absorbant en créant une lame d'air entre l'absorbant acoustique et la paroi qui reçoit l'excitation acoustique.In such a panel, the efficiency of the absorbent can be improved by creating an air space between the acoustic absorbent and the wall which receives the acoustic excitation.
La présente invention concerne un panneau acoustique du type précité dont la structure permet de créer avantageusement cette lame d'air. L'invention concerne ainsi un panneau acoustique comprenant une première et une deuxième paroi entre lesquelles est disposé un absorbant acoustique caractérisé en ce que, la première paroi présente, sur une face interne dirigée vers l'absorbant acoustique, une plaque en un matériau viscoélastique, ainsi qu'une contre-plaque, des éléments d'écartement (par exemple stries parallèles, nids d'abeille, gaufrage, et/ou picots) étant répartis selon au moins une dimension et créant une lame d'air entre l'absorbant et la contre-plaque.The present invention relates to an acoustic panel of the aforementioned type, the structure of which makes it possible to advantageously create this air space. The invention thus relates to an acoustic panel comprising a first and a second wall between which an acoustic absorbent is disposed, characterized in that, the first wall has, on an internal face directed towards the acoustic absorbent, a plate made of a viscoelastic material, as well as a counterplate, spacing elements (for example parallel ridges, honeycombs, embossing, and / or spikes) being distributed in at least one dimension and creating an air space between the absorbent and the counter plate.
Plus particulièrement, les éléments d'écartement, peuvent former un réseau à deux dimensions par exemple une grille ou un nid d'abeille ou un gaufrage ou bien encore des picots répartis selon ces deux dimensions.More particularly, the spacing elements can form a two-dimensional network, for example a grid or a honeycomb or an embossing, or even pins distributed along these two dimensions.
La grille, le nid d'abeille ou le gaufrage peut constituer un filet ou un sac à l'intérieur duquel est placé l'absorbant acoustique. En particulier, le filet ou le sac peut être en un matériau thermiquement conducteur de sorte qu'il constitue un drain thermique entre lesdites parois. Un film autocollant portant ledit réseau (par exemple grille, nid d'abeille, gaufrage et/ou picots) peut être collé sur l'absorbant acoustique, notamment sur un emballage de l'absorbant acoustique, ou sur la contre- plaque.The grid, the honeycomb or the embossing can constitute a net or a bag inside which the acoustic absorbent is placed. In particular, the net or the bag may be made of a thermally conductive material so that it constitutes a heat sink between said walls. A self-adhesive film carrying said network (for example grid, honeycomb, embossing and / or spikes) can be stuck on the acoustic absorbent, in particular on a packaging of the acoustic absorbent, or on the backplate.
Selon une variante préférée, la contre-plaque est rigidifiée par un gaufrage, des nervures parallèles ou non, un nid d'abeille, des picots ou des bossages.According to a preferred variant, the counterplate is stiffened by an embossing, ribs which may or may not be parallel, a honeycomb, spikes or bosses.
D'autres caractéristiques et avantages de l'invention apparaîtront mieux à la lecture de la description ci-après, donnée à titre d'exemple non limitatif, en liaison avec les dessins dans lesquels : - la figure 1 représente en vue éclatée un mode de réalisation de l'invention ; - les figures 2 à 6 illustrent des variantes de l'invention ;Other characteristics and advantages of the invention will appear better on reading the description below, given by way of nonlimiting example, in conjunction with the drawings in which: - Figure 1 shows in exploded view a mode of realization of the invention; - Figures 2 to 6 illustrate variants of the invention;
A la figure 1, le panneau acoustique présente une première plaque 1 qui reçoit l'excitation acoustique (flèche F) lorsque le panneau est mis en place, une deuxième paroi 2 et un absorbant acoustique 3, par exemple de la laine de verre qui peut être contenue dans une fine enveloppeIn FIG. 1, the acoustic panel has a first plate 1 which receives the acoustic excitation (arrow F) when the panel is put in place, a second wall 2 and an acoustic absorbent 3, for example glass wool which can be contained in a thin envelope
4 en « Mylar » (Marque déposée de du Pont).4 in “Mylar” (Registered trademark of du Pont).
La plaque 1 présente sur sa face interne une plaque 17 en matériau viscoélastique (par exemple le matériau « Deltane » de la Société PAULSTRA). La lame d'air est réalisée à l'aide d'un écarteur mécanique constitué par un grillage ou un gaufrage 5, qui peut être solidaire d'une contre- plaque 10 rigide, ou bien par une contre-plaque gaufrée.The plate 1 has on its internal face a plate 17 of viscoelastic material (for example the “Deltane” material from the company PAULSTRA). The air gap is produced using a mechanical spacer constituted by a mesh or an embossing 5, which can be secured to a rigid counter plate 10, or else by an embossed counter plate.
La forme de la maille peut être quelconque, par contre sa taille doit être telle que sous l'action des pressions que subit l'absorbant, celui- ci ne doit pas dépasser la surface définie par la maille afin qu'il ne puisse pas venir en contact avec la contre-plaque 10 et que la lame d'air garde l'épaisseur souhaitée.The shape of the mesh can be any, on the other hand its size must be such that under the action of the pressures which the absorbent undergoes, this one must not exceed the surface defined by the mesh so that it cannot come in contact with the counterplate 10 and that the air knife keeps the desired thickness.
La nature du matériau constituant le grillage est choisie en fonction des contraintes d'environnement de l'application envisagée. Ce matériau peut être malléable pour permettre au grillage d'épouser des formes compliquées, à condition qu'au cours de la déformation et sous les pressions de montage ou d'utilisation l'absorbant 3 ne puisse pas venir en contact avec la contre-plaque 10.The nature of the material constituting the mesh is chosen according to the environmental constraints of the envisaged application. This material can be malleable to allow the mesh to conform to complicated shapes, provided that during deformation and under mounting or operating pressures the absorbent 3 cannot come into contact with the counterplate 10.
Le grillage 5 défini peut être collé sur la face interne de la contre-plaque 10 en prenant la précaution que la colle ne remplisse pas les mailles du grillage à fin d'éviter le contact avec l'absorbant acoustique.The mesh 5 defined can be glued to the internal face of the counter plate 10 taking the precaution that the glue does not fill the mesh of the mesh in order to avoid contact with the acoustic absorbent.
L'absorbant 3 est de la laine de verre de faible densité contenue dans une fine enveloppe en « Mylar » (Marque déposée). L'écarteur peut être un grillage en fil d'acier inoxydable de 0,5 mm de diamètre et dont la maille est un carré de 10 mm de côté. La réduction de la transparence est de l'ordre de 3 à 4 dB.Absorbent 3 is low density glass wool contained in a thin “Mylar” envelope (registered trademark). The spacer can be a mesh of stainless steel wire 0.5 mm in diameter and whose mesh is a square of 10 mm side. The reduction in transparency is of the order of 3 to 4 dB.
Le grillage 5, par exemple carré (figure 2), peut être remplacé par un nid d'abeille 6 (figure 3) de dimension convenable. Une maille trop petite conduit à une grande surface de liaison entre la contre-plaque 10 et l'absorbant 3, ce qui diminue la performance. On peut substituer au grillage des picots 8 (figure 4) régulièrement répartis sur la surface interne 11 de la contre-plaque 10. Ceci peut se faire à l'aide d'un film auto-collant 9 qui porte ces picots 8 et qui est collé sur la surface 11. Alternativement, ce film 9 peut être tout aussi bien collé sur l'absorbant 3 ou son emballage 4 comme il en existe pour certaines laines de verre.The mesh 5, for example square (Figure 2), can be replaced by a honeycomb 6 (Figure 3) of suitable size. Too small a mesh leads to a large connection surface between the counterplate 10 and the absorbent 3, which decreases the performance. It is possible to replace the grid with pins 8 (FIG. 4) regularly distributed over the internal surface 11 of the counterplate 10. This can be done using a self-adhesive film 9 which carries these pins 8 and which is bonded to the surface 11. Alternatively, this film 9 can be just as well bonded to the absorbent 3 or its packaging 4 as there are for certain glass wools.
Il faut toutefois veiller à éviter le poinçonnement de l'absorbant qui favoriserait alors son contact avec la contre-plaque 10 et donc un couplage non désiré avec la paroi 1 recevant l'excitation. Le grillage 5 peut constituer un filet 7 dans lequel est placé l'absorbant 3.However, care must be taken to avoid puncturing of the absorbent which would then favor its contact with the counterplate 10 and therefore an unwanted coupling with the wall 1 receiving the excitation. The mesh 5 can constitute a net 7 in which the absorbent 3 is placed.
Selon une variante de mise en œuvre de l'invention, la plaque 1 présente sur sa face interne une plaque en matériau viscoélastique 17 (par exemple le matériau "Deltane" de la Société PAULSTRA) et une contre- plaque 10 qui est gaufrée afin de la rigidifier et qui sert à amortir les vibrations de la plaque 1 soumise à l'excitation. Cette configuration permet d'alléger la contreplaque 10 (et éventuellement la plaque 17) en diminuant son épaisseur tout en maintenant sa raideur à l'aide de l'inertie des parois 18 perpendiculaires à sa surface. Ces dernières servent d'écarteur pour éviter le contact de l'absorbant avec la contre-plaque (figure 9).According to a variant implementation of the invention, the plate 1 has on its internal face a plate of viscoelastic material 17 (for example the "Deltane" material from the company PAULSTRA) and a counter plate 10 which is embossed in order to stiffen it and which serves to dampen the vibrations of the plate 1 subjected to excitation. This configuration makes it possible to lighten the plywood 10 (and possibly the plate 17) by reducing its thickness while maintaining its stiffness using the inertia of the walls 18 perpendicular to its surface. These serve as spacers to avoid contact of the absorbent with the counterplate (Figure 9).
Dans les modes de réalisation des figures 5 à 7, la contre- plaque 10 peut être constituée par une plaque collée 20 portant des stries 18 à une ou deux dimensions.In the embodiments of FIGS. 5 to 7, the counter plate 10 can be constituted by a glued plate 20 carrying grooves 18 in one or two dimensions.
A la figure 6, les écarteurs 18 sont des nervures de la contre- plaque 10 ménagées selon une seule dimension et espacés les unes des autres, en général avec un pas constant.In FIG. 6, the spacers 18 are ribs of the counterplate 10 formed in one dimension and spaced from each other, in general with a constant pitch.
A la figure 7, les nervures 18 (réparties selon une ou deux dimensions) de la contre-plaque 10 sont suffisamment larges pour que la plaque 17 en matériau viscoélastique en occupe la partie creuse 19 (voir en particulier l'encadré de la figure 7).In FIG. 7, the ribs 18 (distributed in one or two dimensions) of the counter plate 10 are sufficiently wide for the plate 17 of viscoelastic material to occupy the hollow part 19 thereof (see in particular the box in FIG. 7 ).
EXEMPLE 1EXAMPLE 1
Une paroi 1 en aluminium de 1 ,2 mm d'épaisseur est amortie d'une part par une feuille 17 en matériau visco-élastique de 1 mm d'épaisseur et d'autre part par une contre-plaque 10 plane en aluminium de 0,5 mm d'épaisseur.An aluminum wall 1 of 1.2 mm thick is absorbed on the one hand by a sheet 17 of visco-elastic material 1 mm thick and on the other hand by a flat aluminum counter-plate 10 of 0 , 5 mm thick.
EXEMPLE 2 Une paroi 1 en aluminium de 1 ,2 mm d'épaisseur est amortie d'une part par une feuille 17 en matériau visco-élastique de 0,5 mm d'épaisseur et d'autre part par une contre-plaque 10 en aluminium de 0,3 mm d'épaisseur gaufrée avec une maille carrée de 10 mm de côté et d'une hauteur de nervure de 2 mm (Cf. figure 6).EXAMPLE 2 A wall 1 of aluminum 1.2 mm thick is absorbed on the one hand by a sheet 17 of visco-elastic material 0.5 mm thick and on the other hand by a counter plate 10 of aluminum of 0.3 mm thick embossed with a square mesh of 10 mm side and a rib height of 2 mm (See Figure 6).
La figure 8 illustre, pour une excitation de 0,1 g d'une plaque 1 en aluminium (210 x 230 mm) de 1 ,2 mm d'épaisseur, le niveau d'accélération verticale en m/s2 en fonction de la fréquence F (entre 0 et 3000 Hz), pour : Courbe I : ladite plaque 1 seule ; Courbe II : ladite plaque 1 amortie par une feuille 17 en matériau visco-élastique (« Deltane ») de 1 mm d'épaisseur et une contre- plaque plane 10 en aluminium de 0,5 mm d'épaisseur ;FIG. 8 illustrates, for an excitation of 0.1 g of an aluminum plate 1 (210 x 230 mm) 1, 2 mm thick, the level of vertical acceleration in m / s 2 as a function of the frequency F (between 0 and 3000 Hz), for: Curve I: said plate 1 only; Curve II: said plate 1 damped by a sheet 17 of visco-elastic material (“Deltane”) 1 mm thick and a flat counter-plate 10 made of aluminum 0.5 mm thick;
Courbe III : ladite plaque 1 amortie par une feuille 17 en matériau visco-élastique (« Deltane ») de 0,5 mm d'épaisseur, recouverte en son centre d'une contre-plaque 10 en aluminium (150 mm x 15 mm) de 0,3 mm d'épaisseur gaufrée avec une maille carrée de 10 mm de côté et d'une hauteur de nervure de 2 mm.Curve III: said plate 1 damped by a sheet 17 of visco-elastic material (“Deltane”) 0.5 mm thick, covered in its center with an aluminum counter-plate 10 (150 mm x 15 mm) 0.3 mm thick embossed with a square mesh of 10 mm side and a rib height of 2 mm.
On voit que les pics de vibrations (courge I) sont bien amortis dans les deux cas (courbes II et III). La rigidification de la contre-plaque 10 permet, à performances comparables ou meilleures, de diminuer l'épaisseur à la fois de la feuille visco-élastique 17 et de la contre-plaque 10, d'où un gain de poids important. We see that the vibration peaks (squash I) are well damped in both cases (curves II and III). The stiffening of the counter plate 10 makes it possible, with comparable or better performance, to reduce the thickness of both the visco-elastic sheet 17 and the counter plate 10, hence a significant weight saving.

Claims

REVENDICATIONS
1) Panneau acoustique comprenant une première et une deuxième paroi entre lesquelles est disposé un absorbant acoustique caractérisé en ce que, la première paroi présente (1), sur une face interne dirigée vers l'absorbant acoustique, une plaque (17) en matériau viscoélastique ainsi qu'une contre-plaque (10) portant des éléments d'écartement (5, 18) étant répartis selon au moins une dimension et créant une lame d'air entre l'absorbant (3) et la contre-plaque (10).1) Acoustic panel comprising a first and a second wall between which is placed an acoustic absorbent characterized in that, the first wall has (1), on an internal face directed towards the acoustic absorbent, a plate (17) of viscoelastic material as well as a counter plate (10) carrying spacers (5, 18) being distributed along at least one dimension and creating an air space between the absorbent (3) and the counter plate (10) .
2) Panneau acoustique selon la revendication 1, caractérisé en ce que les éléments d'écartement (5, 6, 8, 18) forment un réseau à deux dimensions.2) Acoustic panel according to claim 1, characterized in that the spacer elements (5, 6, 8, 18) form a two-dimensional network.
3) Panneau acoustique selon la revendication 2, caractérisé en ce que ledit réseau comporte une grille, un nid d'abeille ou un gaufrage.3) Acoustic panel according to claim 2, characterized in that said network comprises a grid, a honeycomb or an embossing.
4) Panneau acoustique selon la revendication 3, caractérisé en ce que la grille, le nid d'abeille ou le gaufrage constitue un filet (7) à l'intérieur duquel est placé l'absorbant acoustique (3).4) Acoustic panel according to claim 3, characterized in that the grid, the honeycomb or the embossing constitutes a net (7) inside which is placed the acoustic absorbent (3).
5) Panneau acoustique selon la revendication 2, caractérisé en ce que le réseau comporte des picots (8) répartis selon lesdites deux dimensions. 6) Panneau acoustique selon une des revendications 2 à 5, caractérisé en ce qu'il comporte un film autocollant (9) portant ledit réseau, ce film étant collé sur l'absorbant acoustique (3), notamment sur un emballage de l'absorbant acoustique (3).5) Acoustic panel according to claim 2, characterized in that the network comprises pins (8) distributed along said two dimensions. 6) Acoustic panel according to one of claims 2 to 5, characterized in that it comprises a self-adhesive film (9) carrying said network, this film being bonded to the acoustic absorbent (3), in particular on a package of the absorbent acoustic (3).
7) Panneau acoustique selon une des revendications 1 ou 2, caractérisé en ce que lesdits éléments d'écartement sont des éléments de renforcement solidaires de la contre-plaque (10)7) Acoustic panel according to one of claims 1 or 2, characterized in that said spacing elements are reinforcing elements integral with the counterplate (10)
8) Panneau acoustique selon la revendication 7, caractérisé en ce que lesdits éléments de renforcement sont un gaufrage (18), des nervures parallèles ou non, un nid d'abeille, des picots ou des bossages (4). 8) Acoustic panel according to claim 7, characterized in that said reinforcing elements are an embossing (18), ribs parallel or not, a honeycomb, spikes or bosses (4).
EP03789519A 2002-12-02 2003-11-27 Double-wall acoustic panel Expired - Lifetime EP1570139B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0215119 2002-12-02
FR0215119A FR2847919B1 (en) 2002-12-02 2002-12-02 DOUBLE-WALL ACOUSTIC PANEL
PCT/FR2003/003513 WO2004053246A1 (en) 2002-12-02 2003-11-27 Double-wall acoustic panel

Publications (2)

Publication Number Publication Date
EP1570139A1 true EP1570139A1 (en) 2005-09-07
EP1570139B1 EP1570139B1 (en) 2006-12-13

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EP03789519A Expired - Lifetime EP1570139B1 (en) 2002-12-02 2003-11-27 Double-wall acoustic panel

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US (1) US20060124388A1 (en)
EP (1) EP1570139B1 (en)
AT (1) ATE348226T1 (en)
DE (1) DE60310451T2 (en)
ES (1) ES2279214T3 (en)
FR (1) FR2847919B1 (en)
WO (1) WO2004053246A1 (en)

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Also Published As

Publication number Publication date
FR2847919A1 (en) 2004-06-04
US20060124388A1 (en) 2006-06-15
ATE348226T1 (en) 2007-01-15
EP1570139B1 (en) 2006-12-13
DE60310451D1 (en) 2007-01-25
ES2279214T3 (en) 2007-08-16
WO2004053246A1 (en) 2004-06-24
DE60310451T2 (en) 2007-10-11
FR2847919B1 (en) 2005-11-11

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