EP2758955A1 - Intermediate acoustic skin and the implementation thereof - Google Patents

Intermediate acoustic skin and the implementation thereof

Info

Publication number
EP2758955A1
EP2758955A1 EP12767063.6A EP12767063A EP2758955A1 EP 2758955 A1 EP2758955 A1 EP 2758955A1 EP 12767063 A EP12767063 A EP 12767063A EP 2758955 A1 EP2758955 A1 EP 2758955A1
Authority
EP
European Patent Office
Prior art keywords
septum
acoustic
honeycomb core
core structure
plates
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Withdrawn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
EP12767063.6A
Other languages
German (de)
French (fr)
Inventor
Didier HEURTAUX
François William Vincent PETIT
Sébastien René Jean ROBINET
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.)
Safran Nacelles SAS
Original Assignee
Aircelle 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 Aircelle SA filed Critical Aircelle SA
Publication of EP2758955A1 publication Critical patent/EP2758955A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
    • B64C1/40—Sound or heat insulation, e.g. using insulation blankets
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/19—Sheets or webs edge spliced or joined
    • Y10T428/192—Sheets or webs coplanar

Definitions

  • the present invention relates to a septum for acoustic panel, said septum being in particular pierced glass.
  • the invention also relates to a single or dual acoustic resonator comprising such a septum.
  • the invention also relates to an acoustic panel incorporating a single or dual resonator comprising the septum according to the invention, such an acoustic panel being more particularly intended to be mounted in an aircraft nacelle supporting a turbojet engine.
  • Aircraft turbojets generate significant noise pollution. There is a strong demand to reduce this pollution, especially as the turbojets used become more and more powerful.
  • the design of the nacelle surrounding a turbojet contributes to a large extent to the reduction of this noise pollution.
  • nacelles are equipped with acoustic panels to reduce the noise generated by the turbojet engine and vibration structures.
  • an acoustic panel includes an acoustic resonator, forming a so-called intermediate layer, said acoustic resonator being enveloped by a so-called internal skin and a so-called external skin in order to form said acoustic panel.
  • An acoustic resonator typically includes one or more honeycomb core structures (commonly referred to as "honeycomb") separated by a porous multi-perforated skin called a septum.
  • Such septum may be formed from a plurality of rectangular septum plates contacted edge-to-edge at a juncture edge, said septum plates being generally obtained by cutting into a strip, for example in aluminium .
  • the septum may also consist of a plurality of glass plates. The septum provides better sound absorption.
  • Simple acoustic resonators composed of a single honeycomb core structure on which a septum can be attached.
  • Double acoustic resonators are also known, composed of at least two septum-wrapped cellular core structures (which may for example be bonded to one of the two structures or to both structures),
  • An acoustic panel comprises in particular a single or double acoustic resonator as defined above and forming an intermediate layer of said panel.
  • An acoustic panel may be simple and comprise a simple acoustic resonator as defined above and covered, on the one hand, on its outer face, with an outer skin attached to the nacelle, forming an outer layer of the acoustic panel and, on the other hand, on the other hand, on its inner face, an inner skin fixed on said inner face, forming an inner layer of the acoustic panel.
  • a double acoustic resonator comprises a double acoustic resonator as defined above, on the internal face of which is fixed an internal skin, forming an inner layer of the acoustic panel, and on the outer face of which an external skin is attached. to the nacelle forms an outer layer of said acoustic panel.
  • acoustic The outer skin of the acoustic panel, called “acoustic”, is perforated and is permeable to air; it is intended to be exposed to the flow of air passing through the interior of the nacelle and generating the noise to be attenuated.
  • full The inner skin of the acoustic panel, called “full”, is not perforated and is impervious to air; it is not in contact with the flow of air passing through the interior of the nacelle.
  • external is used when an organ is exposed to the airflow to be acoustically attenuated.
  • internal means an organ that is not in contact with said air flow passing through the nacelle.
  • Such panels can "trap” the noise and thus reduce noise emissions to the outside of the nacelle.
  • a honeycomb core structure can be realized by assembling a plurality of cellular units in the form of rectangular plates interconnected by nodal joints.
  • Each alveolar unit has a plurality of alveolar cells.
  • the joining surface constituted by the contact surface between the nodal joints of a first cellular unit and the nodal joints of a second cellular unit is called the joining edge of cellular units.
  • the acoustical properties of the acoustic panel ie its rate of noise absorption as a function of the frequency and sound level of the noise, depend in part on the junction with the septum of the cellular units, which form the structure. with alveolar core.
  • the junction at the level of Joining edge of cellular units is commonly performed using a foaming glue, such as FM 410® glue.
  • the septum When assembling and firing an acoustic panel, the septum, due to the difference in materials undergoes a thermal expansion of amplitude different from that of other surrounding materials. This induces offsets and delamination between the junction edges of the rectangular septum plates and the junction edges of the cellular units.
  • a known solution is, during assembly, to avoid matching a junction edge of a septum plate with a joining edge of cellular units.
  • An object of the present invention is to solve these disadvantages by proposing a septum intended to be associated with at least one cellular core structure, the assembly forming a resonator, and requiring substantially no repair after the baking phase of such a device. resonator.
  • Another object of the invention is also to provide an acoustic panel incorporating a resonator comprising a septum according to the invention.
  • the invention proposes such a septum made from at least two adjacent plates placed in edge-to-edge contact at the level of at least one joining edge of a septum plate. at least one angle between a joining edge of a septum plate and one of its adjacent sides is less than 90 °.
  • one of the junction edges of the septum plates is bevelled so as to have an angle with one of their adjacent edges of less than 90 °.
  • this feature of the invention allows to cause an angular offset between a joining edge of cellular units and a joining edge of a septum plate.
  • An advantage of this angular offset is, during the cooking phase of such a septum integral with at least one honeycomb core structure, of to allow a better dispersion of the thermal deformations and to avoid a concentration and an accumulation of such deformations in only one direction and thus to avoid the detachment and the offset between a joining edge of a septum plate with a joining edge of alveolar units.
  • At least one angle between a joining edge of a septum plate and one of its adjacent sides is substantially equal to 45 °.
  • the adjustment of the septum plates is easier and the forces are better distributed on each cellular unit cell.
  • At least one of the plates that make up the septum according to the invention is made of glass, in particular pierced.
  • the invention also relates to a simple acoustic resonator remarkable in that it comprises a honeycomb core structure on the inner face of which is fixed by connecting means, in particular by bonding, at least one septum according to the invention. 'invention.
  • the invention also relates to a double acoustic resonator comprising a first honeycomb core structure and a second honeycomb core structure, said structures being separated by a septum according to the invention, with the septum being attached to at least one of the core structures alveolar by connecting means, in particular by gluing.
  • the invention also relates to an acoustic panel for nacelle of an aircraft comprising an acoustic resonator according to the invention on an outer face of which is fixed at least one permeable acoustic skin.
  • an acoustic panel according to the invention comprises at least one impermeable solid skin fixed on an internal face of the acoustic resonator according to the invention.
  • the invention relates to a nacelle for rboreactor comprising an acoustic panel according to the invention.
  • FIG. 1 is a schematic cross sectional view of a double resonator panel
  • FIG. 2 illustrates a deseptum plate constituting a septum according to the invention, positioned above the honeycomb;
  • FIG. 3 illustrates septum plates according to the invention, positioned on a honeycomb core structure, specifying the offset between the joining edge of alveolar units and the joining edge of the septum plates.
  • the present invention is not limited thereto and may relate to any acoustic panel structure implementing a septum.
  • an acoustic panel 1 is composed of a sandwich structure comprising successively in the direction of thickness: an outer skin 3 multiperforated (acoustic skin), a double acoustic resonator 4 and an internal skin 6 (full skin).
  • the outer skin 3 of the acoustic panel 1 is perforated and permeable to air. It forms the outer layer of the acoustic panel 1.
  • the inner skin 6 of the acoustic panel 1 is not perforated and is impervious to air. It forms the inner layer of the acoustic panel 1.
  • the outer skin 3 is perforated with a multitude of holes 5 of small diameter, in particular between 1, 2 and 1, 9 mm, typically equal to about 1, 5mm.
  • the perforation of the skin is done by any suitable means known to those skilled in the art, such as a laser, a water jet or a conventional multi-spindle perforator.
  • the holes 5 are spaced so that the ratio of the perforated surface to the total area including the holes allows the absorption of the desired noise frequency (s).
  • a dual acoustic resonator 4 according to the invention comprises, in the direction of thickness, a first honeycomb core structure 9a and a second honeycomb core structure 9b (commonly called “honeycomb” structures) separated by a septum 11 according to the invention, said septum being fixed either on the inner face 1 3 of the honeycomb core structure 9a, or on the outer face 15 of the honeycomb core structure 9b, both on the inner face 13 of the honeycomb core structure 9a and on the outer face 15 of the honeycomb core structure 9b.
  • such a honeycomb core structure 9a, 9b can be made of a light alloy, such as aluminum, or a material such as Nomex® which corresponds to a paper based on polyamide fibers and phenolic resin.
  • each honeycomb core structure 9a, 9b is composed of a plurality of cellular units 10a, 10b.
  • At least two cellular units 10a are interconnected by nodal joints in a direction substantially parallel to the longitudinal axis of the nacelle, said longitudinal axis of the nacelle being substantially perpendicular to the ribbon direction of the first honeycomb core structure 9a (respectively of the second honeycomb core structure 9b).
  • Each cellular unit 10a, 10b has substantially the shape of a rectangular plate consisting of a plurality of cellular cells 12.
  • the joining surface constituted by the contact surface between the nodal joints of a first cellular unit and the nodal joints of a second cellular unit is called the joining edge 14 of cellular units.
  • the acoustic resonator 4 is said to be "double" and comprises two cellular core structures 9a and 9b enveloping a septum 11 according to the invention.
  • the first honeycomb core structure 9a and the second honeycomb core structure 9b are each bonded to the septum 11 by an adhesive 17, or by any other means known to those skilled in the art.
  • An acoustic skin 3 is fixed on the outer face 16 of the first honeycomb core structure 9a using an adhesive 8 for example.
  • a solid skin 6 is also fixed on the inner face 20 of the second honeycomb core structure 9b by an adhesive 18.
  • a simple acoustic resonator comprises a honeycomb core structure on the inner face of which is fixed by any means known to those skilled in the art, for example by gluing, a septum according to the invention.
  • the septum according to the invention can occupy all or part of the surface formed by the inner face of the honeycomb core structure.
  • An acoustic skin is attached to the outer face of the honeycomb core structure, for example by gluing or using an adhesive.
  • a full skin may also be fixed directly on the septum according to the invention, said septum then constituting an inner face of the simple acoustic resonator.
  • Said solid skin is fixed by any means known to those skilled in the art, in particular by gluing or with the aid of an adhesive.
  • the acoustic panel thus formed is said acoustic panel single resonator and is intended to be arranged in particular in a turbojet engine nacelle to dampen the sound waves and mitigate the noise pollution thus generated.
  • the septum 11 consists of several plates 19. At least two plates 19 are necessary to obtain a septum according to the invention.
  • the septum plates 19 are used to make the septum advantageously advantageously in glass mechanically pierced by a method well known to those skilled in the art.
  • the septum according to the invention comprises a plurality of adjacent plates placed in edge-to-edge contact at a junction edge 21 of the septum plates 19.
  • the septum plates 19 constituting the septum 11 according to the invention are disposed on a first honeycomb core structure 9a, an edge 23 a septum plate 19 being arranged in a ribbon-like manner in a cellular unit 10a, 10b.
  • the septum plates 19 are attached to the first honeycomb core structure 9a by any means known to those skilled in the art as previously described.
  • the second honeycomb core structure 9b is then fixed on the septum 11 by any means known to those skilled in the art as described above.
  • the resulting assembly thus forms the double acoustic resonator 4.
  • a septum plate 19 has a junction edge 21 bevelled so as to have an angle ⁇ with one of its adjacent sides less than 90 °.
  • This advantageous disposition makes it possible to be sure that the joining edge 21 of a septum plate 19 will not be colearary at a joining edge 14 of cellular units 10a, 10b during the assembly of the septum plates 19 on a honeycomb core structure 9a, 9b.
  • this characteristic of the invention makes it possible to cause an angular offset ⁇ between a joining edge 14 of cellular units 10a, 10b and a joining edge 21 of a septum plate 19.
  • an advantage of this angular offset ⁇ is, during the cooking phase of such a septum 1 1 integral with at least one honeycomb core structure 10a, 10b to allow a better dispersion of the thermal deformations and to avoid a concentrating and accumulating such deformations in a single direction to avoid delamination and misalignment between a joining edge 21 of a septum plate 19 with a joining edge 14 of cellular units 10a, 10b.
  • the angle ⁇ between a joining edge 21 of a septum plate 19 and one of its adjacent sides 25 is substantially equal to 45 °.
  • the adjustment of the septum plates 19 is easier and the forces are better distributed on each cell 12 of cellular unit 10a, 10b.
  • the detachment effect between the septum and the honeycomb core structure is removed.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Securing Of Glass Panes Or The Like (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention relates to a septum made from at least two adjacent plates (19) the edges of which are brought into contact at least at one junction edge (21) of a septum plate (19). Said septum is remarkable in that at least one angle (a) between a junction edge (21) of a septum plate (19) and one of the adjacent sides (25) thereof is less than 90°.

Description

PEAU INTERMEDIAIRE ACOUSTIQUE ET SA MISE EN OEUVRE  ACOUSTIC INTERMEDIATE SKIN AND ITS IMPLEMENTATION
La présente invention concerne un septum pour panneau acoustique, ledit septum étant notamment en verre percé. L'invention se rapporte également à un résonateur acoustique simple ou double comprenant un tel septum. L'invention concerne encore un panneau acoustique intégrant un résonateur simple ou double comprenant le septum selon l'invention, un tel panneau acoustique étant plus particulièrement destiné à être monté dans une nacelle d'aéronef supportant un turboréacteur. The present invention relates to a septum for acoustic panel, said septum being in particular pierced glass. The invention also relates to a single or dual acoustic resonator comprising such a septum. The invention also relates to an acoustic panel incorporating a single or dual resonator comprising the septum according to the invention, such an acoustic panel being more particularly intended to be mounted in an aircraft nacelle supporting a turbojet engine.
Les turboréacteurs d'aéronef sont générateurs d'une pollution sonore importante. Il existe une forte demande visant à réduire cette pollution, et ce d'autant plus que les turboréacteurs utilisés deviennent de plus en plus puissants. La conception de la nacelle entourant un turboréacteur contribue pour une grande partie à la réduction de cette pollution sonore.  Aircraft turbojets generate significant noise pollution. There is a strong demand to reduce this pollution, especially as the turbojets used become more and more powerful. The design of the nacelle surrounding a turbojet contributes to a large extent to the reduction of this noise pollution.
Afin d'améliorer d'avantage les performances acoustiques des aéronefs, les nacelles sont dotées de panneaux acoustiques visant à atténuer les bruits générés par le turboréacteur ainsi que les vibrations des structures.  To further improve the acoustic performance of aircraft, nacelles are equipped with acoustic panels to reduce the noise generated by the turbojet engine and vibration structures.
De man ière conn ue, un pan neau acoustique comprend un résonateur acoustique, formant une couche dite intermédiaire, ledit résonateur acoustique étant enveloppé par une peau dite interne et une peau dite externe afin de former ledit panneau acoustique.  As is known, an acoustic panel includes an acoustic resonator, forming a so-called intermediate layer, said acoustic resonator being enveloped by a so-called internal skin and a so-called external skin in order to form said acoustic panel.
Un résonateur acoustique comprend généralement une ou plusieurs structures à âme alvéolaire (couramment appelée «en nid d'abeille») séparées par une peau poreuse multiperforée appelée septum.  An acoustic resonator typically includes one or more honeycomb core structures (commonly referred to as "honeycomb") separated by a porous multi-perforated skin called a septum.
U n tel septu m peut être form é d ' u n e plural ité de plaques rectangulaires de septum mises en contact bord à bord au niveau d'un bord de jonction, lesdites plaques de septum étant généralement obten ues par découpage dans du feuillard, par exemple en aluminium . Le septum peut également être constitué d'une pluralité de plaques en verre. Le septum permet d'obtenir une meilleure absorption acoustique.  Such septum may be formed from a plurality of rectangular septum plates contacted edge-to-edge at a juncture edge, said septum plates being generally obtained by cutting into a strip, for example in aluminium . The septum may also consist of a plurality of glass plates. The septum provides better sound absorption.
On connaît les résonateurs acoustiques simples, composés d'une seule structure à âme alvéolaire sur laquelle peut être fixé un septum.  Simple acoustic resonators are known, composed of a single honeycomb core structure on which a septum can be attached.
On connaît par ailleurs les résonateurs acoustiques doubles, composés d'au moins deux structures à âme alvéolaire enveloppant un septum (qui peut par exemple être collé sur l'une des deux structures ou sur les deux structures), Un panneau acoustique comprend notamment un résonateur acoustique simple ou double tel que défini précédemment et formant une couche intermédiaire dudit panneau. Double acoustic resonators are also known, composed of at least two septum-wrapped cellular core structures (which may for example be bonded to one of the two structures or to both structures), An acoustic panel comprises in particular a single or double acoustic resonator as defined above and forming an intermediate layer of said panel.
Un panneau acoustique peut être simple et comprendre un résonateur acoustique simple tel que défini précédemment et recouvert, d'une part, sur sa face externe, d'une peau externe fixée à la nacelle, formant une couche externe du panneau acoustique et, d'autre part, sur sa face interne, d'une peau interne fixée sur ladite face interne, formant une couche interne du panneau acoustique.  An acoustic panel may be simple and comprise a simple acoustic resonator as defined above and covered, on the one hand, on its outer face, with an outer skin attached to the nacelle, forming an outer layer of the acoustic panel and, on the other hand, on the other hand, on its inner face, an inner skin fixed on said inner face, forming an inner layer of the acoustic panel.
U n pa n n eau acoustiq ue dou bl e com prend un résonateur acoustique double tel que défini précédemment, sur la face interne duquel est fixée une peau interne, formant une couche interne du panneau acoustique, et sur la face externe duquel une peau externe fixée à la nacelle forme une couche externe dudit panneau acoustique.  A double acoustic resonator comprises a double acoustic resonator as defined above, on the internal face of which is fixed an internal skin, forming an inner layer of the acoustic panel, and on the outer face of which an external skin is attached. to the nacelle forms an outer layer of said acoustic panel.
La peau externe du panneau acoustique, dite « acoustique », est perforée et est perméable à l'air ; elle est destinée à être exposée au flux d'air traversant l'intérieur de la nacelle et générant le bruit à atténuer.  The outer skin of the acoustic panel, called "acoustic", is perforated and is permeable to air; it is intended to be exposed to the flow of air passing through the interior of the nacelle and generating the noise to be attenuated.
La peau interne du panneau acoustique, dite « pleine », n'est pas perforée et est imperméable à l'air ; elle n'est pas en contact avec le flux d'air traversant l'intérieur de la nacelle.  The inner skin of the acoustic panel, called "full", is not perforated and is impervious to air; it is not in contact with the flow of air passing through the interior of the nacelle.
Le terme « externe » est employé lorsqu'un organe se trouve exposé au flux d'air à atténuer acoustiquement. Le terme « interne » désigne un organe qui n'est pas en contact avec ledit flux d'air traversant la nacelle.  The term "external" is used when an organ is exposed to the airflow to be acoustically attenuated. The term "internal" means an organ that is not in contact with said air flow passing through the nacelle.
De tels panneaux permettent de « piéger » le bruit et donc d'atténuer les émissions sonores en direction de l'extérieur de la nacelle.  Such panels can "trap" the noise and thus reduce noise emissions to the outside of the nacelle.
D'une façon connue, une structure à âme alvéolaire peut être réal isée par l'assemblage d'une pluralité d'unités alvéolaires se présentant sous forme de plaques rectangulaires liées entre elles par des joints nodaux. Chaque unité alvéolaire possède une pluralité de cellules alvéolaires.  In known manner, a honeycomb core structure can be realized by assembling a plurality of cellular units in the form of rectangular plates interconnected by nodal joints. Each alveolar unit has a plurality of alveolar cells.
La surface de jonction constituée par la surface de contact entre les joints nodaux d'une première unité alvéolaire et les joints nodaux d'une seconde unité alvéolaire est appelée bord de jonction d'unités alvéolaires.  The joining surface constituted by the contact surface between the nodal joints of a first cellular unit and the nodal joints of a second cellular unit is called the joining edge of cellular units.
Les propriétés acoustiques du panneau acoustique, c'est-à-dire son taux d'absorption du bruit en fonction de la fréquence et du niveau sonore du bruit, dépendent en partie de la jonction avec le septum des unités alvéolaires, qui forment la structure à âme alvéolaire. La jonction au niveau du bord de jonction d'unités alvéolaires est couramment réalisée à l'aide d'une colle moussante, telle que la colle FM 410®. The acoustical properties of the acoustic panel, ie its rate of noise absorption as a function of the frequency and sound level of the noise, depend in part on the junction with the septum of the cellular units, which form the structure. with alveolar core. The junction at the level of Joining edge of cellular units is commonly performed using a foaming glue, such as FM 410® glue.
Lors de l'assemblage et de la cuisson d'un panneau acoustique, le septum, en raison de la différence de matériaux subit une dilatation thermique d'amplitude différente de celle des autres matériaux environnants. Ceci induit des décalages et des décollements entre les bords de jonction des plaques de septum, rectangulaires, et les bords de jonction des unités alvéolaires. When assembling and firing an acoustic panel, the septum, due to the difference in materials undergoes a thermal expansion of amplitude different from that of other surrounding materials. This induces offsets and delamination between the junction edges of the rectangular septum plates and the junction edges of the cellular units.
Après cuisson, il est donc nécessaire de rattraper ces décollements, ce qu i impacte la performance acoustique du panneau, et retarde le processus de fabrication d'un tel panneau.  After cooking, it is therefore necessary to make up for these detachments, which i impacts the acoustic performance of the panel, and delays the manufacturing process of such a panel.
Une solution connue est, lors de l'assemblage, d'éviter de faire correspondre un bord de jonction d'une plaque de septum avec un bord de jonction d'unités alvéolaires.  A known solution is, during assembly, to avoid matching a junction edge of a septum plate with a joining edge of cellular units.
Cette solution ne permet toutefois que de limiter l'effet de décollement, sans l'empêcher totalement, de sorte qu'une réparation après la phase de cuisson reste indispensable.  This solution, however, allows only to limit the effect of separation, without completely preventing it, so that a repair after the cooking phase remains essential.
Un but de la présente invention est de résoudre ces inconvénients en proposant un septum destiné à être associé à au moins une structure à âme alvéolaire, l'ensemble formant un résonateur, et ne nécessitant sensiblement aucune réparation après la phase de cuisson d'un tel résonateur.  An object of the present invention is to solve these disadvantages by proposing a septum intended to be associated with at least one cellular core structure, the assembly forming a resonator, and requiring substantially no repair after the baking phase of such a device. resonator.
Un autre but de l'invention est également de proposer un panneau acoustique intégrant un résonateur comprenant un septum selon l'invention.  Another object of the invention is also to provide an acoustic panel incorporating a resonator comprising a septum according to the invention.
A cet effet, l'invention propose un tel septum réalisé à partir d'au moins deux plaques adjacentes mises en contact bord à bord au niveau d'au moins un bord de jonction d'une plaque de septum , led it septum étant remarquable en ce qu'au moins un angle entre un bord de jonction d'une plaque de septum et un de ses côtés adjacents est inférieur à 90°.  For this purpose, the invention proposes such a septum made from at least two adjacent plates placed in edge-to-edge contact at the level of at least one joining edge of a septum plate. at least one angle between a joining edge of a septum plate and one of its adjacent sides is less than 90 °.
Grâce à cette disposition, un des bords de jonction des plaques de septum est biseauté de sorte à présenter un angle avec un de leurs bords adjacents inférieur à 90°. Lors du montage d'un tel septum sur une structure alvéolaire, cette caractéristique de l'invention permet d'entraîner un décalage angulaire entre un bord de jonction d'unités alvéolaires et un bord de jonction d'une plaque de septum.  With this arrangement, one of the junction edges of the septum plates is bevelled so as to have an angle with one of their adjacent edges of less than 90 °. When mounting such a septum on a cellular structure, this feature of the invention allows to cause an angular offset between a joining edge of cellular units and a joining edge of a septum plate.
Un avantage de ce décalage angulaire est, lors de la phase de cuisson d'un tel septum solidaire d'au moins une structure à âme alvéolaire, de permettre une meilleure dispersion des déformations thermiques et d'éviter une concentration et une accumulation de telles déformations dans une seule direction et ainsi d'éviter le décollement et le décalage entre un bord de jonction d'une plaque de septum avec un bord de jonction d'unités alvéolaires. An advantage of this angular offset is, during the cooking phase of such a septum integral with at least one honeycomb core structure, of to allow a better dispersion of the thermal deformations and to avoid a concentration and an accumulation of such deformations in only one direction and thus to avoid the detachment and the offset between a joining edge of a septum plate with a joining edge of alveolar units.
Une telle disposition et un tel avantage permettent de s'affranchir des problèmes inhérents à la cuisson d'un panneau acoustique, ce qui entraîne par ailleurs un gain de temps du processus de fabrication, puisqu'il n'est à présent plus nécessaire de réaliser une étape de réparation après la cuisson du panneau acoustique équipé d'un septum selon l'invention.  Such an arrangement and such an advantage make it possible to overcome the problems inherent in the firing of an acoustic panel, which also entails a saving of time in the manufacturing process, since it is no longer necessary to achieve a repair step after firing the acoustic panel equipped with a septum according to the invention.
De manière avantageuse, au moins un angle entre un bord de jonction d'une plaque de septum et un de ses côtés adjacents est sensiblement égal à 45°.  Advantageously, at least one angle between a joining edge of a septum plate and one of its adjacent sides is substantially equal to 45 °.
Grâce à cette caractéristique de l'invention, l'ajustage des plaques de septum est plus facile et les efforts sont mieux répartis sur chaque cellule d'unité alvéolaire.  Thanks to this characteristic of the invention, the adjustment of the septum plates is easier and the forces are better distributed on each cellular unit cell.
Par ailleurs, au moins une des plaques qui composent le septum selon l'invention est en verre, notamment percé.  Furthermore, at least one of the plates that make up the septum according to the invention is made of glass, in particular pierced.
D'autre part, l'invention concerne aussi un résonateur acoustique simple remarquable en ce qu'il comprend une structure à âme alvéolaire sur la face interne de laquelle est fixé par des moyens de liaison, notamment par collage, au moins un septum selon l'invention.  On the other hand, the invention also relates to a simple acoustic resonator remarkable in that it comprises a honeycomb core structure on the inner face of which is fixed by connecting means, in particular by bonding, at least one septum according to the invention. 'invention.
L'invention porte également sur un résonateur acoustique double comprenant une première structure à âme alvéolaire et une deuxième structure à âme alvéolaire, lesdites structures étant séparées par un septum selon l'invention, led it septum étant fixé à au moins une des structures à âme alvéolaire par des moyens de liaison, notamment par collage.  The invention also relates to a double acoustic resonator comprising a first honeycomb core structure and a second honeycomb core structure, said structures being separated by a septum according to the invention, with the septum being attached to at least one of the core structures alveolar by connecting means, in particular by gluing.
L'invention concerne également un panneau acoustique pour nacelle d'un aéronef comprenant un résonateur acoustique selon l'invention sur une face externe duquel est fixée au moins une peau acoustique perméable.  The invention also relates to an acoustic panel for nacelle of an aircraft comprising an acoustic resonator according to the invention on an outer face of which is fixed at least one permeable acoustic skin.
En outre, un panneau acoustique selon l'invention comprend au moins une peau pleine imperméable fixée sur une face interne du résonateur acoustique selon l'invention.  In addition, an acoustic panel according to the invention comprises at least one impermeable solid skin fixed on an internal face of the acoustic resonator according to the invention.
Enfin , l ' invention concerne u ne nacelle pou r tu rboréacteur comprenant un panneau acoustique selon l'invention. L'invention sera mieux comprise à la lecture de la description détaillée qui suit, en regard du dessin annexé dans lequel : Finally, the invention relates to a nacelle for rboreactor comprising an acoustic panel according to the invention. The invention will be better understood on reading the detailed description which follows, with reference to the appended drawing in which:
- la figure 1 est une vue en coupe schématique transversale d'un panneau à double résonateur ;  - Figure 1 is a schematic cross sectional view of a double resonator panel;
- la figure 2 illustre une plaque deseptum constitutive d'un septum selon l ' invention , positionnée su r u n e st ru ct u re à â m e alvéolaire ;  FIG. 2 illustrates a deseptum plate constituting a septum according to the invention, positioned above the honeycomb;
- la figure 3 illustre des plaques de septum selon l'invention, positionnées sur une structure à âme alvéolaire, précisant le décalage entre le bord de jonction d'unités alvéolaires et le bord de jonction des plaques de septum.  FIG. 3 illustrates septum plates according to the invention, positioned on a honeycomb core structure, specifying the offset between the joining edge of alveolar units and the joining edge of the septum plates.
Bien qu'illustrée à titre d'exemple par un panneau acoustique à double résonateur, la présente invention n'y est pas limitée et peut concerner toute structure de panneau acoustique mettant en œuvre un septum. Although illustrated as an example by a double resonator acoustic panel, the present invention is not limited thereto and may relate to any acoustic panel structure implementing a septum.
En référence à la figure 1 , un panneau acoustique 1 est composé d 'u ne structu re sandwich com portant successivement dans le sens de l'épaisseur : une peau externe 3 multiperforée (peau acoustique), un résonateur acoustique double 4 et une peau interne 6 (peau pleine). With reference to FIG. 1, an acoustic panel 1 is composed of a sandwich structure comprising successively in the direction of thickness: an outer skin 3 multiperforated (acoustic skin), a double acoustic resonator 4 and an internal skin 6 (full skin).
La peau externe 3 du panneau acoustique 1 est perforée et perméable à l'air. Elle forme la couche externe du panneau acoustique 1 .  The outer skin 3 of the acoustic panel 1 is perforated and permeable to air. It forms the outer layer of the acoustic panel 1.
La peau interne 6 du panneau acoustique 1 n'est pas perforée et est imperméable à l'air. Elle forme la couche interne du panneau acoustique 1 .  The inner skin 6 of the acoustic panel 1 is not perforated and is impervious to air. It forms the inner layer of the acoustic panel 1.
La peau externe 3 est perforée d'une multitude de trous 5 de petit diamètre, notamment compris entre 1 ,2 et 1 ,9 mm, typiquement égal à environ 1 ,5mm . La perforation de lad ite peau est effectuée par tout moyen adapté connu de l'homme du métier, tel qu'un laser, un jet d'eau ou une perforatrice usuelle de type multibroche. Les trous 5 sont espacés de manière à ce que le rapport entre la surface perforée et la surface totale comprenant les trous permet l'absorption de la ou des fréquences du bruit souhaité.  The outer skin 3 is perforated with a multitude of holes 5 of small diameter, in particular between 1, 2 and 1, 9 mm, typically equal to about 1, 5mm. The perforation of the skin is done by any suitable means known to those skilled in the art, such as a laser, a water jet or a conventional multi-spindle perforator. The holes 5 are spaced so that the ratio of the perforated surface to the total area including the holes allows the absorption of the desired noise frequency (s).
Un résonateur acoustique double 4 selon l'invention comprend dans le sens de l'épaisseur une première structure à âme alvéolaire 9a et une deuxième structure à âme alvéolaire 9b (structures couramment appelées «en nid d'abeille») séparées par un septum 1 1 selon l'invention, ledit septum étant fixé soit sur la face interne 1 3 de la structure à âme alvéolaire 9a, soit sur la face externe 15 de la structure à âme alvéolaire 9b, soit à la fois sur la face interne 13 de la structure à âme alvéolaire 9a et sur la face externe 15 de la structure à âme alvéolaire 9b. A dual acoustic resonator 4 according to the invention comprises, in the direction of thickness, a first honeycomb core structure 9a and a second honeycomb core structure 9b (commonly called "honeycomb" structures) separated by a septum 11 according to the invention, said septum being fixed either on the inner face 1 3 of the honeycomb core structure 9a, or on the outer face 15 of the honeycomb core structure 9b, both on the inner face 13 of the honeycomb core structure 9a and on the outer face 15 of the honeycomb core structure 9b.
Typiquement, une telle structure à âme alvéolaire 9a, 9b peut être fabriquée dans un alliage léger, tel que l'aluminium, ou dans un matériau tel que le Nomex® qui correspond à un papier à base de fibres polyamides et de résine phénolique.  Typically, such a honeycomb core structure 9a, 9b can be made of a light alloy, such as aluminum, or a material such as Nomex® which corresponds to a paper based on polyamide fibers and phenolic resin.
Par ailleurs, chaque structure à âme alvéolaire 9a, 9b est composée d'une pluralité d'unités alvéolaires 10a, 10b.  Furthermore, each honeycomb core structure 9a, 9b is composed of a plurality of cellular units 10a, 10b.
Afin de former la première structure à âme alvéolaire 9a In order to form the first honeycomb core structure 9a
(respectivement la deuxième structure à âme alvéolaire 9b), au moins deux unités alvéolaires 10a (respectivement 10b) sont reliées entre elles par des joints nodaux selon une direction sensiblement parallèle à l'axe longitudinal de la nacelle, ledit axe longitudinal de la nacelle étant sensiblement perpendiculaire au sens ruban de la première structure à âme alvéolaire 9a (respectivement de la deuxième structure à âme alvéolaire 9b). (respectively the second honeycomb core structure 9b), at least two cellular units 10a (respectively 10b) are interconnected by nodal joints in a direction substantially parallel to the longitudinal axis of the nacelle, said longitudinal axis of the nacelle being substantially perpendicular to the ribbon direction of the first honeycomb core structure 9a (respectively of the second honeycomb core structure 9b).
Chaque unité alvéolaire 10a, 10b a sensiblement la forme d'une plaque rectangulaire constituée d'une pluralité de cellules alvéolaires 12.  Each cellular unit 10a, 10b has substantially the shape of a rectangular plate consisting of a plurality of cellular cells 12.
La surface de jonction constituée par la surface de contact entre les joints nodaux d'une première unité alvéolaire et les joints nodaux d'une seconde unité alvéolaire est appelée bord de jonction 14 d'unités alvéolaires.  The joining surface constituted by the contact surface between the nodal joints of a first cellular unit and the nodal joints of a second cellular unit is called the joining edge 14 of cellular units.
Le résonateur acoustique 4 est dit « double » et comprend deux structures à âme alvéolaire 9a et 9b enveloppant un septum 11 selon l'invention. La première structure à âme alvéolaire 9a et la deuxième structure à âme alvéolaire 9b sont chacune liées au septum 11 par un adhésif 17, ou par tout autre moyen connu de l'homme du métier.  The acoustic resonator 4 is said to be "double" and comprises two cellular core structures 9a and 9b enveloping a septum 11 according to the invention. The first honeycomb core structure 9a and the second honeycomb core structure 9b are each bonded to the septum 11 by an adhesive 17, or by any other means known to those skilled in the art.
Une peau acoustique 3 est fixée sur la face externe 16 de la première structure à âme alvéolaire 9a à l'aide d'un adhésif 8 par exemple. Une peau pleine 6 est également fixée sur la face interne 20 de la deuxième structure à âme alvéolaire 9b par un adhésif 18.  An acoustic skin 3 is fixed on the outer face 16 of the first honeycomb core structure 9a using an adhesive 8 for example. A solid skin 6 is also fixed on the inner face 20 of the second honeycomb core structure 9b by an adhesive 18.
Le panneau acoustique 1 ainsi formé est dit panneau acoustique à double résonateur, ledit double résonateur formant une couche intermédiaire dudit panneau acoustique 1 , et est destiné à être disposé notamment dans une nacelle de turboréacteur pour amortir les ondes sonores et atténuer la pollution sonore ainsi générée. Selon un autre mode de réalisation non représenté de l'invention, un résonateur acoustique simple comprend une structure à âme alvéolaire sur la face interne duquel est fixé par tout moyen connu de l'homme du métier, par exemple par collage, un septum selon l'invention . Le septum selon l'invention peut occuper tout ou partie de la surface formée par la face interne de la structure à âme alvéolaire. The acoustic panel 1 thus formed is said double resonator acoustic panel, said double resonator forming an intermediate layer of said acoustic panel 1, and is intended to be arranged in particular in a turbojet engine nacelle for damping the sound waves and attenuate the noise pollution thus generated . According to another embodiment not shown of the invention, a simple acoustic resonator comprises a honeycomb core structure on the inner face of which is fixed by any means known to those skilled in the art, for example by gluing, a septum according to the invention. invention. The septum according to the invention can occupy all or part of the surface formed by the inner face of the honeycomb core structure.
Une peau acoustique est fixée en la face externe de la structure à âme alvéolaire, par exemple par collage ou à l'aide d'un adhésif.  An acoustic skin is attached to the outer face of the honeycomb core structure, for example by gluing or using an adhesive.
Une peau pleine peut également être fixée directement sur le septum selon l'invention, ledit septum constituant alors une face interne du résonateur acoustique simple. Ladite peau pleine est fixée par tout moyen connu de l'homme du métier, notamment par collage ou à l'aide d'un adhésif.  A full skin may also be fixed directly on the septum according to the invention, said septum then constituting an inner face of the simple acoustic resonator. Said solid skin is fixed by any means known to those skilled in the art, in particular by gluing or with the aid of an adhesive.
Le panneau acoustique ainsi formé est dit panneau acoustique à simple résonateur et est destiné à être disposé notamment dans une nacelle de turboréacteur pour amortir les ondes sonores et atténuer la pollution sonore ainsi générée.  The acoustic panel thus formed is said acoustic panel single resonator and is intended to be arranged in particular in a turbojet engine nacelle to dampen the sound waves and mitigate the noise pollution thus generated.
Conformément à l'invention, en référence aux figures 2 et 3, le septum 1 1 est constitué de plusieurs plaques 19. Au moins deux plaques 19 sont nécessaires pour obtenir un septum selon l'invention . Les plaques de septum 19 ut i l i sées pou r réa l i se r l e septu m sel on l ' i n ve ntio n son t avantageusement en verre mécaniquement percé par un procédé bien connu de l'homme du métier. According to the invention, with reference to FIGS. 2 and 3, the septum 11 consists of several plates 19. At least two plates 19 are necessary to obtain a septum according to the invention. The septum plates 19 are used to make the septum advantageously advantageously in glass mechanically pierced by a method well known to those skilled in the art.
Le septu m selon l ' invention com prend pl usieu rs plaq ues 19 adjacentes mises en contact bord à bord au niveau d'un bord de jonction 21 des plaques de septum 19.  The septum according to the invention comprises a plurality of adjacent plates placed in edge-to-edge contact at a junction edge 21 of the septum plates 19.
Lors de la fabrication d'un résonateur ou d'un panneau acoustique intégrant le septum selon l'invention, on dispose les plaques de septum 19 constituant le septum 1 1 selon l'invention sur une première structure à âme alvéolaire 9a, un bord 23 d'une plaque de septum 19 étant disposé de manière col inéaire au sens ruban d'une unité alvéolaire 1 0a, 1 0b. Les plaques de septum 19 sont fixées à la première structure à âme alvéolaire 9a par tout moyen connu de l'homme du métier comme décrit précédemment. On fixe ensuite sur le septum 1 1 la deuxième structure à âme alvéolaire 9b par tout moyen connu de l'homme du métier comme décrit précédemment. L'ensemble obtenu forme ainsi le résonateur acoustique double 4. Selon l'invention, une plaque de septum 19 possède un bord de jonction 21 biseauté de sorte à présenter un angle a avec un de ses côtés adjacents 25 inférieur à 90°. During the manufacture of a resonator or an acoustic panel integrating the septum according to the invention, the septum plates 19 constituting the septum 11 according to the invention are disposed on a first honeycomb core structure 9a, an edge 23 a septum plate 19 being arranged in a ribbon-like manner in a cellular unit 10a, 10b. The septum plates 19 are attached to the first honeycomb core structure 9a by any means known to those skilled in the art as previously described. The second honeycomb core structure 9b is then fixed on the septum 11 by any means known to those skilled in the art as described above. The resulting assembly thus forms the double acoustic resonator 4. According to the invention, a septum plate 19 has a junction edge 21 bevelled so as to have an angle α with one of its adjacent sides less than 90 °.
Cette d isposition avantageuse permet d'être sûr que le bord de jonction 21 d'une plaque de septum 19 ne sera pas col inéaire à un bord de jonction 14 d'unités alvéolaires 10a, 10b lors de l'assemblage des plaques de septum 19 sur une structure à âme alvéolaire 9a, 9b.  This advantageous disposition makes it possible to be sure that the joining edge 21 of a septum plate 19 will not be colearary at a joining edge 14 of cellular units 10a, 10b during the assembly of the septum plates 19 on a honeycomb core structure 9a, 9b.
En effet, cette caractéristique de l'invention permet d'entraîner un décalage angulaire φ entre un bord de jonction 14 d'unités alvéolaires 10a, 10b et un bord de jonction 21 d'une plaque de septum 19.  Indeed, this characteristic of the invention makes it possible to cause an angular offset φ between a joining edge 14 of cellular units 10a, 10b and a joining edge 21 of a septum plate 19.
Un avantage de ce décalage angulaire φ est, lors de la phase de cuisson d'un tel septum 1 1 solidaire d'au moins une structure à âme alvéolaire 1 0a, 1 0b de permettre une meilleure dispersion des déformations thermiques et d'éviter une concentration et une accumulation de telles déformations dans une seule direction d'éviter le décollement et le décalage entre un bord de jonction 21 d'une plaque de septum 19 avec un bord de jonction 14 d'unités alvéolaires 10a, 10b.  An advantage of this angular offset φ is, during the cooking phase of such a septum 1 1 integral with at least one honeycomb core structure 10a, 10b to allow a better dispersion of the thermal deformations and to avoid a concentrating and accumulating such deformations in a single direction to avoid delamination and misalignment between a joining edge 21 of a septum plate 19 with a joining edge 14 of cellular units 10a, 10b.
Enfin , une telle disposition et un tel avantage permettent de s'affranchir des problèmes inhérents à la cuisson d'un panneau acoustique, ce qui entraîne par ailleurs un gain de temps du processus de fabrication, puisqu'il n'est à présent plus nécessaire de réaliser une étape de réparation après la cuisson du panneau acoustique 1 équipé d'un septum 1 1 selon l'invention.  Finally, such an arrangement and such an advantage make it possible to overcome the problems inherent in the firing of an acoustic panel, which also entails a time saving of the manufacturing process, since it is now no longer necessary. to perform a repair step after baking the acoustic panel 1 equipped with a septum 1 1 according to the invention.
Avantageusement, l'angle a entre un bord de jonction 21 d'une plaque de septum 19 et un de ses côtés adjacents 25 est sensiblement égal à 45°. Advantageously, the angle α between a joining edge 21 of a septum plate 19 and one of its adjacent sides 25 is substantially equal to 45 °.
Grâce à cette caractéristique de l'invention, l'ajustage des plaques de septum 19 est plus facile et les efforts sont mieux répartis sur chaque cellule 12 d'unité alvéolaire 10a, 10b.  Thanks to this characteristic of the invention, the adjustment of the septum plates 19 is easier and the forces are better distributed on each cell 12 of cellular unit 10a, 10b.
Grâce à la présente l'invention , l'effet de décollement entre le septum et la structure à âme alvéolaire se trouve supprimé. With the present invention, the detachment effect between the septum and the honeycomb core structure is removed.
Un tel avantage permet de s'affranchir des problèmes liés à la phase de cuisson lors de la fabrication d'un panneau acoustique. Comme il va de soi, l'invention ne se limite pas aux seules formes de réalisation décrites ci-dessus à titre d'exemples, mais elle embrasse au contraire toutes les variantes. Such an advantage makes it possible to overcome the problems associated with the cooking phase during the manufacture of an acoustic panel. As goes without saying, the invention is not limited to the embodiments described above as examples, but it embraces all variants.

Claims

REVENDICATIONS
1 . Septum (1 1 ) réalisé à partir d'au moins deux plaques de septum (19) adjacentes mises en contact bord à bord au niveau d'au moins un bord de jonction (21 ) desdites plaques de septum (19), ledit septum étant caractérisé en ce qu'au moins un angle (a) entre l'un desdits bords de jonction (21 ) d'une plaque de septum (19) et un des côtés desdites plaques adjacents (25) audit bord de jonction est inférieur à 90°. 1. Septum (1 1) made from at least two adjacent septum plates (19) contacted edge-to-edge at at least one joining edge (21) of said septum plates (19), said septum being characterized in that at least one angle (a) between one of said joint edges (21) of a septum plate (19) and one side of said adjacent plates (25) at said joint edge is less than 90 °.
2. Septum (1 1 ) selon la revendication 1 , caractérisé en ce qu'au moins un angle (a) entre un bord de jonction (21 ) d'une plaque de septum (19) et un de ses côtés adjacents (25) est sensiblement égal à 45°. 2. Septum (1 1) according to claim 1, characterized in that at least one angle (a) between a joining edge (21) of a septum plate (19) and one of its adjacent sides (25) is substantially equal to 45 °.
3. Septum (1 1 ) selon l'une quelconque des revendications 1 ou 2, caractérisé en ce qu'au moins une des plaques qui le compose est en verre, notamment percé. 3. Septum (1 1) according to any one of claims 1 or 2, characterized in that at least one of the plates which is composed of glass, including pierced.
4. Résonateur acoustique simple caractérisé en ce qu'il comprend une structure à âme alvéolaire sur la face interne (13) de laquelle est fixé par des moyens de liaison, notamment par collage, au moins un septum (1 1 ) selon l'une quelconque des revendications 1 à 3. 4. Simple acoustic resonator characterized in that it comprises a honeycomb core structure on the inner face (13) of which is fixed by connecting means, in particular by bonding, at least one septum (1 1) according to one any of claims 1 to 3.
5. Résonateur acoustique double (4) caractérisé en ce q u'il comprend une première structure à âme alvéolaire (9a) et une deuxième structure à âme alvéolaire (9b), lesdites structures étant séparées par un septum (1 1 ) selon l'une quelconque des revendications 1 à 3, ledit septum étant fixé à au moins une des structures à âme alvéolaire (9a, 9b) par des moyens de liaison, notamment par collage. 5. Double acoustic resonator (4) characterized in that it comprises a first honeycomb core structure (9a) and a second honeycomb core structure (9b), said structures being separated by a septum (1 1) according to the any one of claims 1 to 3, said septum being attached to at least one of the honeycomb core structures (9a, 9b) by connecting means, in particular by gluing.
6. Panneau acoustique (1 ) pour nacelle d'un aéronef caractérisé en ce qu'il comprend un résonateur acoustique selon l'une quelconque des revendications 4 ou 5, sur une face externe 16 duquel est fixée au moins une peau acoustique perméable (3). Acoustic panel (1) for the nacelle of an aircraft characterized in that it comprises an acoustic resonator according to any one of claims 4 or 5, on an outer face 16 of which is fixed at least one permeable acoustic skin (3). ).
7. Panneau acoustique (1 ) pour nacelle d'un aéronef selon la revendication 6, caractérisé en ce qu'au moins une peau pleine imperméable (6) est fixée sur une face interne (20) du résonateur acoustique. Acoustic panel (1) for nacelle of an aircraft according to claim 6, characterized in that at least one impermeable solid skin (6) is fixed on an inner face (20) of the acoustic resonator.
8. Nacelle pour turboréacteur comprenant un panneau acoustique8. Nacelle for turbojet comprising an acoustic panel
(1 ) selon l'une quelconque des revendications 6 ou 7. (1) according to any one of claims 6 or 7.
EP12767063.6A 2011-09-21 2012-09-11 Intermediate acoustic skin and the implementation thereof Withdrawn EP2758955A1 (en)

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PCT/FR2012/052026 WO2013041795A1 (en) 2011-09-21 2012-09-11 Intermediate acoustic skin and the implementation thereof

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BR112014006235A2 (en) 2017-04-04
FR2980297A1 (en) 2013-03-22
FR2980297B1 (en) 2015-09-04
US20140202789A1 (en) 2014-07-24
CA2847668A1 (en) 2013-03-28
CN103827958A (en) 2014-05-28
RU2014114646A (en) 2015-10-27
WO2013041795A1 (en) 2013-03-28

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