FR3088658A1 - STRUCTURE CONSTITUTING AN ACOUSTIC INSULATOR - Google Patents
STRUCTURE CONSTITUTING AN ACOUSTIC INSULATOR Download PDFInfo
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- FR3088658A1 FR3088658A1 FR1871557A FR1871557A FR3088658A1 FR 3088658 A1 FR3088658 A1 FR 3088658A1 FR 1871557 A FR1871557 A FR 1871557A FR 1871557 A FR1871557 A FR 1871557A FR 3088658 A1 FR3088658 A1 FR 3088658A1
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- plate
- tube
- intermediate plate
- recess
- tubes
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- 239000012212 insulator Substances 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000007493 shaping process Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 2
- 238000004026 adhesive bonding Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
- B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
- B32B3/085—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts spaced apart pieces on the surface of a layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/043—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B3/18—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by an internal layer formed of separate pieces of material which are juxtaposed side-by-side
- B32B3/20—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by an internal layer formed of separate pieces of material which are juxtaposed side-by-side of hollow pieces, e.g. tubes; of pieces with channels or cavities
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D29/00—Power-plant nacelles, fairings, or cowlings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
- F02K1/78—Other construction of jet pipes
- F02K1/82—Jet pipe walls, e.g. liners
- F02K1/827—Sound absorbing structures or liners
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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
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/03—3 layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
- B32B2307/102—Insulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2605/00—Vehicles
- B32B2605/18—Aircraft
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D33/00—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for
- B64D33/02—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes
- B64D2033/0206—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes comprising noise reduction means, e.g. acoustic liners
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
L'invention concerne une structure (100) constituant un isolant acoustique et comportant une première plaque (102), une pluralité de tubes (110), où chaque tube (110) est cylindrique et fixé à une face de la première plaque (102) et présente son axe perpendiculaire à ladite face, une plaque intermédiaire (112), qui comporte une plaque (112a) et, pour chaque tube (110), un renfoncement (112b) issu d'une mise en forme de la plaque (112a) et qui prend une forme de révolution autour d'un axe central, où la plaque intermédiaire (112) est fixée contre les tubes (110) de manière à ce qu'un renfoncement (112b) loge dans chaque tube (110), et où chaque renfoncement (112b) est percé d'une ouverture (302), et une deuxième plaque (104) percée de trous (106) et fixée à la plaque intermédiaire (112) du côté opposé aux renfoncements (112b). Une telle structure permet d'obtenir une atténuation de plusieurs fréquences acoustiques et est facile à fabriquer.The invention relates to a structure (100) constituting an acoustic insulator and comprising a first plate (102), a plurality of tubes (110), where each tube (110) is cylindrical and fixed to one face of the first plate (102). and has its axis perpendicular to said face, an intermediate plate (112), which comprises a plate (112a) and, for each tube (110), a recess (112b) resulting from a shaping of the plate (112a) and which takes a shape of revolution around a central axis, where the intermediate plate (112) is fixed against the tubes (110) so that a recess (112b) accommodates in each tube (110), and where each recess (112b) is pierced with an opening (302), and a second plate (104) pierced with holes (106) and fixed to the intermediate plate (112) on the side opposite to the recesses (112b). Such a structure makes it possible to obtain attenuation of several acoustic frequencies and is easy to manufacture.
Description
DESCRIPTIONDESCRIPTION
TITRE : STRUCTURE CONSTITUANT UN ISOLANT ACOUSTIQUETITLE: STRUCTURE CONSTITUTING AN ACOUSTIC INSULATOR
DOMAINE TECHNIQUETECHNICAL AREA
La présente invention concerne une structure constituant un isolant acoustique, ainsi qu’un procédé de fabrication d’une telle structure.The present invention relates to a structure constituting an acoustic insulator, as well as to a process for manufacturing such a structure.
ETAT DE LA TECHNIQUE ANTERIEURESTATE OF THE PRIOR ART
Lors de son fonctionnement, un moteur d’aéronef génère du bruit. Ce moteur est logé dans une nacelle et pour atténuer ce bruit, il est connu de mettre en place des structures constituant un isolant acoustique autour du moteur dans la structure de la nacelle.During operation, an aircraft engine generates noise. This motor is housed in a nacelle and to reduce this noise, it is known to set up structures constituting an acoustic insulator around the motor in the structure of the nacelle.
De telles structures constituant un isolant acoustique prennent par exemple la forme de structures en nid d’abeilles. Une telle structure en nid d’abeilles comporte deux plaques parallèles dont une est perforée et entre lesquelles sont agencées des cellules hexagonales juxtaposées les unes aux autres.Such structures constituting an acoustic insulator take, for example, the form of honeycomb structures. Such a honeycomb structure comprises two parallel plates, one of which is perforated and between which are arranged hexagonal cells juxtaposed to each other.
Il est également connu dans d’autres applications d’utiliser des troncs de cône qui sont placés dans des cavités.It is also known in other applications to use truncated cones which are placed in cavities.
Bien que d’un point de vue acoustique, de telles structures donnent de bons résultats, il est souhaitable de trouver une structure constituant un isolant acoustique qui permette d’atténuer un certain nombre de fréquences acoustiques et qui soit facile à fabriquer.Although from an acoustic point of view, such structures give good results, it is desirable to find a structure constituting an acoustic insulator which makes it possible to attenuate a certain number of acoustic frequencies and which is easy to manufacture.
EXPOSE DE L'INVENTIONSTATEMENT OF THE INVENTION
Un objet de la présente invention est de proposer une structure constituant un isolant acoustique qui puisse atténuer un certain nombre de fréquences acoustiques et qui soit facile à fabriquer.An object of the present invention is to provide a structure constituting an acoustic insulator which can attenuate a certain number of acoustic frequencies and which is easy to manufacture.
A cet effet, est proposée une structure constituant un isolant acoustique et comportant :To this end, a structure is proposed constituting an acoustic insulator and comprising:
- une première plaque (102),- a first plate (102),
- une pluralité de tubes, où chaque tube est cylindrique et fixé à une face de la première plaque et présente son axe perpendiculaire à ladite face,a plurality of tubes, where each tube is cylindrical and fixed to one face of the first plate and has its axis perpendicular to said face,
- une plaque intermédiaire, qui comporte une plaque et, pour chaque tube, un renfoncement issu d’une mise en forme de la plaque et qui prend une forme de révolution autour d’un axe central, où la plaque intermédiaire est fixée contre les tubes de manière à ce qu’un renfoncement loge dans chaque tube, et où chaque renfoncement est percé d’une ouverture, et- an intermediate plate, which comprises a plate and, for each tube, a recess resulting from a shaping of the plate and which takes a shape of revolution around a central axis, where the intermediate plate is fixed against the tubes so that a recess is housed in each tube, and where each recess is pierced with an opening, and
- une deuxième plaque percée de trous et fixée à la plaque intermédiaire du côté opposé aux renfoncements.- a second plate pierced with holes and fixed to the intermediate plate on the side opposite the recesses.
Une telle structure permet d’obtenir une atténuation de plusieurs fréquences acoustiques et est facile à fabriquer.Such a structure makes it possible to obtain attenuation of several acoustic frequencies and is easy to manufacture.
Avantageusement, la première plaque, chaque tube, la plaque intermédiaire et la deuxième plaque sont métalliques, et chaque renfoncement est un embouti issu d’une déformation de la plaque par emboutissage.Advantageously, the first plate, each tube, the intermediate plate and the second plate are metallic, and each indentation is a stamped product resulting from a deformation of the plate by stamping.
Avantageusement, chaque embouti prend la forme d’un cylindre fermé par un dôme.Advantageously, each stamp takes the form of a cylinder closed by a dome.
Avantageusement, les tubes sont disposés les uns contre les antres en quinconce.Advantageously, the tubes are arranged one against the other in staggered rows.
L’invention propose également un procédé de fabrication d’une structure selon l'une des variantes précédentes, comportant :The invention also provides a method of manufacturing a structure according to one of the preceding variants, comprising:
- une première étape de fourniture au cours de laquelle la plaque intermédiaire est fournie,- a first supply stage during which the intermediate plate is supplied,
- une étape de mise en forme au cours de laquelle la plaque intermédiaire ainsi fournie est mise en forme pour former les renfoncements et les ouvertures,- a shaping step during which the intermediate plate thus supplied is shaped to form the recesses and the openings,
- une deuxième étape de fourniture au cours de laquelle la première plaque est fournie,- a second supply stage during which the first plate is supplied,
- une troisième étape de fourniture au cours de laquelle les tubes sont fournis,- a third stage of supply during which the tubes are supplied,
- une première étape de fixation an cours de laquelle chaque tube ainsi fourni est fixé sur une face de la première plaque ainsi fournie et où l’axe du tube est perpendiculaire à ladite face,- a first fixing step in the course of which each tube thus supplied is fixed to one face of the first plate thus supplied and where the axis of the tube is perpendicular to said face,
- une deuxième étape de fixation au cours de laquelle la plaque intermédiaire ainsi mise en forme est fixée contre les tubes de manière à ce qu’un renfoncement loge dans chaque tube, et- a second fixing step during which the intermediate plate thus formed is fixed against the tubes so that a recess accommodates in each tube, and
- une troisième étape de fixation au cours de laquelle la deuxième plaque est fixée à la plaque intermédiaire du côté opposé aux renfoncements.- A third fixing step during which the second plate is fixed to the intermediate plate on the side opposite the recesses.
Avantageusement, la première plaque, chaque tube, la plaque intermédiaire et la deuxième plaque sont métalliques, et l’étape de mise en forme comprend une étape d’emboutissage pour former chaque renfoncement sous la forme d’un embouti.Advantageously, the first plate, each tube, the intermediate plate and the second plate are metallic, and the shaping step comprises a stamping step to form each recess in the form of a stamping.
BREVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS
Les caractéristiques de l'invention mentionnées ci-dessus, ainsi que d'autres, apparaîtront plus clairement à la lecture de la description suivante d'un exemple de réalisation, ladite description étant faite en relation avec les dessins joints, parmi lesquels :The characteristics of the invention mentioned above, as well as others, will appear more clearly on reading the following description of an exemplary embodiment, said description being made in relation to the accompanying drawings, among which:
[Fig. 1] est une vue en perspective et en vue éclatée d’une structure constituant un isolant acoustique selon l’invention, [Fig. 2] est une vue de dessus de cages de la structure de la Fig. 1, et [Fig. 3] est une vue éclatée et en coupe par le plan III de la structure de la Fig. 1.[Fig. 1] is a perspective view and exploded view of a structure constituting an acoustic insulator according to the invention, [Fig. 2] is a top view of cages of the structure of FIG. 1, and [Fig. 3] is an exploded view in section through plane III of the structure of FIG. 1.
EXPOSE DETAILLE DE MODES DE REALISATIONDETAILED DESCRIPTION OF EMBODIMENTS
La Fig. 1 montre une structure 100 constituant un isolant acoustique selon l’invention. La structure 100 comporte une première plaque 102 et une deuxième plaque 104 qui sont à distance l’une de l’autre. L’une des plaques, ici la deuxième plaque 104, est percée de trous 106 pour permettre le passage des ondes acoustiques. La première plaque 102 et la deuxième plaque 104 sont par exemple en tôle métallique en particulier en aluminium.Fig. 1 shows a structure 100 constituting an acoustic insulator according to the invention. The structure 100 comprises a first plate 102 and a second plate 104 which are at a distance from each other. One of the plates, here the second plate 104, is pierced with holes 106 to allow the passage of the acoustic waves. The first plate 102 and the second plate 104 are for example made of metal sheet, in particular aluminum.
Une pluralité de tubes 110 qui sont cylindriques. Les tubes 110 sont fixés à une face de la première plaque 102 où chaque tube 110 présente son axe perpendiculaire à ladite face.A plurality of tubes 110 which are cylindrical. The tubes 110 are fixed to a face of the first plate 102 where each tube 110 has its axis perpendicular to said face.
La Fig. 2 montre un exemple d’implantation des tubes 110.Fig. 2 shows an example of installation of the tubes 110.
La Fig. 3 montre une vue de côté de la structure 100.Fig. 3 shows a side view of the structure 100.
La structure 100 comporte également une plaque intermédiaire 112 qui comporte une plaque 112a et, pour chaque tube 110, un embouti 112b issu d’une déformation de la plaque 112a par emboutissage et qui prend une forme de révolution autour d’un axe central et qui prend ici la forme d’un cylindre fermé par un dôme.The structure 100 also comprises an intermediate plate 112 which comprises a plate 112a and, for each tube 110, a stamped 112b resulting from a deformation of the plate 112a by stamping and which takes a shape of revolution around a central axis and which here takes the form of a cylinder closed by a dome.
La plaque intermédiaire 112 est fixée contre les tubes 110 de manière à ce qu’un embouti 112b loge dans chaque tube 110. L’axe de chaque tube 110 est coaxial avec l’axe central de l’embouti 112b.The intermediate plate 112 is fixed against the tubes 110 so that a stamped 112b is housed in each tube 110. The axis of each tube 110 is coaxial with the central axis of the stamped 112b.
La deuxième plaque 104 est fixée à la plaque intermédiaire 112 du côté opposé aux emboutis 112b.The second plate 104 is fixed to the intermediate plate 112 on the side opposite to the stampings 112b.
La structure 100 forme ainsi une structure sandwich entre la première plaque 102 et la deuxième plaque 104 avec entre elles les tubes et la plaque intermédiaire 112. La fixation de chaque élément avec son voisin s’effectue par exemple par collage.The structure 100 thus forms a sandwich structure between the first plate 102 and the second plate 104 with between them the tubes and the intermediate plate 112. The fixing of each element with its neighbor is carried out for example by gluing.
Chaque embouti 112b est également percé d’une ouverture 302 pour permettre le passage des ondes acoustiques depuis la deuxième plaque 104 jusqu’à la première plaque 102 en traversant les emboutis 112b. Chaque ouverture 302 est ici au sommet du dôme.Each stamped 112b is also pierced with an opening 302 to allow the passage of acoustic waves from the second plate 104 to the first plate 102 through the stamped 112b. Each opening 302 is here at the top of the dome.
La plaque intermédiaire 112 est réalisée dans un matériau métallique qui peut subir un emboutissage comme par exemple l’aluminium.The intermediate plate 112 is made of a metallic material which can undergo a stamping such as for example aluminum.
De la même manière, les cylindres 110 sont de préférence métalliques comme par exemple en aluminium.Likewise, the cylinders 110 are preferably metallic such as for example aluminum.
Une telle structure 100 constitue ainsi un isolant acoustique qui combine le principe quart d’ondes et un résonateur d’Helmholtz. Le volume entre la deuxième plaque 104 et chaque embouti 112b atténue les hautes fréquences, et le volume entre la première plaque 102 et chaque embouti 112b atténue les basses fréquences.Such a structure 100 thus constitutes an acoustic insulator which combines the quarter-wave principle and a Helmholtz resonator. The volume between the second plate 104 and each stamped 112b attenuates the high frequencies, and the volume between the first plate 102 and each stamped 112b attenuates the low frequencies.
En outre, une telle structure 100 est facile à réaliser.In addition, such a structure 100 is easy to produce.
Pour optimiser le nombre de tubes 110 et d’emboutis 112b afin d’optimiser l’absorption acoustique, les tubes 110 sont disposés les uns contre les autres en quinconce comme le montre la Fig. 2. Les emboutis 112b prennent alors le même positionnement.To optimize the number of tubes 110 and stamps 112b in order to optimize the sound absorption, the tubes 110 are arranged in a staggered arrangement as shown in FIG. 2. The stamped 112b then take the same position.
Lorsque la première plaque 102, la deuxième plaque 104, les tubes 110 et la plaque intermédiaire 112 sont en métal, ils sont fixés par collage et le procédé de fabrication de la structure 100 comporte :When the first plate 102, the second plate 104, the tubes 110 and the intermediate plate 112 are made of metal, they are fixed by gluing and the method of manufacturing the structure 100 comprises:
- une première étape de fourniture au cours de laquelle la plaque intermédiaire 112 est fournie,a first supply step during which the intermediate plate 112 is supplied,
- une étape d’emboutissage au cours de laquelle la plaque intermédiaire 112 ainsi fournie est emboutie pour former les emboutis 112b et les ouvertures 302,- a stamping step during which the intermediate plate 112 thus supplied is stamped to form the stamped 112b and the openings 302,
- une deuxième étape de fourniture au cours de laquelle la première plaque 102 est fournie,a second supply stage during which the first plate 102 is supplied,
- une troisième étape de fourniture au cours de laquelle les tubes 110 sont fournis,a third supply stage during which the tubes 110 are supplied,
- une première étape de fixation au cours de laquelle chaque tube 110 ainsi fourni est fixé sur une face de la première plaque 102 ainsi fournie et où l’axe du tube 110 est perpendiculaire à ladite face,a first fixing step during which each tube 110 thus supplied is fixed to one face of the first plate 102 thus supplied and where the axis of the tube 110 is perpendicular to said face,
- une deuxième étape de fixation au cours de laquelle la plaque intermédiaire 112 ainsi emboutie est fixée contre les tubes 110 de manière à ce qu’un embouti 112b loge dans chaque tube 110, eta second fixing step during which the intermediate plate 112 thus pressed is fixed against the tubes 110 so that a pressed 112b lodges in each tube 110, and
- une troisième étape de fixation au cours de laquelle la deuxième plaque 104 est fixée à la plaque intermédiaire 112 du côté opposé aux emboutis 112b.- A third fixing step during which the second plate 104 is fixed to the intermediate plate 112 on the side opposite the stamps 112b.
L’étape d’emboutissage s’effectue de manière classique avec une presse à emboutir avec des poinçons perforants pour réaliser les ouvertures 302.The stamping step is carried out in a conventional manner with a stamping press with perforating punches to make the openings 302.
Les étapes de fixation consistent préférentiellement par collage à chaud et sous pression qui consiste en la dépose d’un cordon de colle entre deux éléments à fixer, une mise en pression de la structure 100 assemblée avec les cordons de colle et une mise en cuisson de la structure 100 ainsi mise en pression.The fixing steps preferably consist of hot gluing and under pressure, which consists of depositing a bead of glue between two elements to be fixed, pressurizing the structure 100 assembled with the beads of glue and baking the the structure 100 thus pressurized.
Lorsqu’il y a un risque de présence de liquides dans la structure 100, les extrémités des tubes 110 qui se trouvent le plus bas, présentent des perçages pour permettre le drainage des liquides.When there is a risk of the presence of liquids in the structure 100, the ends of the tubes 110 which are the lowest, have holes to allow the drainage of the liquids.
La description a été plus particulièrement décrite dans le cas où la première plaque 102, chaque tube 110, la plaque intermédiaire 112 et la deuxième plaque 104 sont métalliques, mais elle s’applique de la même manière si ces éléments sont réalisés en matériau composite.The description has been more particularly described in the case where the first plate 102, each tube 110, the intermediate plate 112 and the second plate 104 are metallic, but it applies in the same way if these elements are made of composite material.
Chaque embouti 112b est alors généralisé sous la forme d’un renfoncement qui est issu d’une mise en forme de la plaque 112a, qui est percé d’une ouverture 302 et qui prend la forme d’un cylindre fermé par un dôme.Each stamped 112b is then generalized in the form of a recess which results from a shaping of the plate 112a, which is pierced with an opening 302 and which takes the form of a cylinder closed by a dome.
D’une manière générale, la structure 100 comporte alors :In general, the structure 100 then comprises:
- la première plaque 102,- the first plate 102,
- la pluralité de tubes 110, où chaque tube 110 est cylindrique et fixé à une face de la première plaque 102 et présente son axe perpendiculaire à ladite face,the plurality of tubes 110, where each tube 110 is cylindrical and fixed to one face of the first plate 102 and has its axis perpendicular to said face,
- la plaque intermédiaire 112, qui comporte la plaque 112a et, pour chaque tube 110, un renfoncement 112b issu de la mise en forme de la plaque 112a et qui prend une forme de révolution autour d’un axe central, où la plaque intermédiaire 112 est fixée contre les tubes 110 de manière à ce qu’un renfoncement 112b loge dans chaque tube 110, et où chaque renfoncement 112b est percé d’une ouverture 302, et- The intermediate plate 112, which comprises the plate 112a and, for each tube 110, a recess 112b resulting from the shaping of the plate 112a and which takes a shape of revolution around a central axis, where the intermediate plate 112 is fixed against the tubes 110 so that a recess 112b accommodates in each tube 110, and where each recess 112b is pierced with an opening 302, and
- la deuxième plaque 104 percée de trous 106 et fixée à la plaque intermédiaire 112 du côté opposé aux renfoncements 112b.- The second plate 104 pierced with holes 106 and fixed to the intermediate plate 112 on the side opposite to the recesses 112b.
Le procédé de fabrication est alors généralisé sous la forme :The manufacturing process is then generalized in the form:
- d’une première étape de fourniture au cours de laquelle la plaque intermédiaire 112 est fournie,- a first stage of supply during which the intermediate plate 112 is supplied,
- d’une étape de mise en forme au cours de laquelle la plaque intermédiaire 112 ainsi fournie est mise en forme pour former les renfoncements 112b et les ouvertures 302,- a shaping step during which the intermediate plate 112 thus supplied is shaped to form the recesses 112b and the openings 302,
- d’une deuxième étape de fourniture au cours de laquelle la première plaque 102 est fournie,- a second supply step during which the first plate 102 is supplied,
- d’une troisième étape de fourniture au cours de laquelle les tubes 110 sont fournis,- a third stage of supply during which the tubes 110 are supplied,
- d’une première étape de fixation au cours de laquelle chaque tube 110 ainsi fourni est fixé sur une face de la première plaque 102 ainsi fournie et où l’axe du tube 110 est perpendiculaire à ladite face,- a first fixing step during which each tube 110 thus supplied is fixed to one face of the first plate 102 thus supplied and where the axis of the tube 110 is perpendicular to said face,
- d’une deuxième étape de fixation au cours de laquelle la plaque intermédiaire 112 ainsi mise en forme est fixée contre les tubes 110 de manière à ce qu’un renfoncement 112b loge dans chaque tube 110, et- a second fixing step during which the intermediate plate 112 thus formed is fixed against the tubes 110 so that a recess 112b accommodates in each tube 110, and
- d’une troisième étape de fixation au cours de laquelle la deuxième plaque 104 est fixée 15 à la plaque intermédiaire 112 du côté opposé aux renfoncements 112b.- a third fixing step during which the second plate 104 is fixed to the intermediate plate 112 on the side opposite the recesses 112b.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1871557A FR3088658B1 (en) | 2018-11-16 | 2018-11-16 | STRUCTURE CONSTITUTING AN ACOUSTIC INSULATION |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1871557A FR3088658B1 (en) | 2018-11-16 | 2018-11-16 | STRUCTURE CONSTITUTING AN ACOUSTIC INSULATION |
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| Publication Number | Publication Date |
|---|---|
| FR3088658A1 true FR3088658A1 (en) | 2020-05-22 |
| FR3088658B1 FR3088658B1 (en) | 2021-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| FR1871557A Active FR3088658B1 (en) | 2018-11-16 | 2018-11-16 | STRUCTURE CONSTITUTING AN ACOUSTIC INSULATION |
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| FR (1) | FR3088658B1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3113169A1 (en) * | 2020-07-31 | 2022-02-04 | Airbus Operations | Process for manufacturing an acoustic panel with a capsular skin and acoustic panel incorporating such a skin |
| US20230003176A1 (en) * | 2020-03-04 | 2023-01-05 | Safran Nacelles | Method for manufacturing a structure with cellular cores for a turbojet nacelle |
| EP4152313A1 (en) * | 2021-09-20 | 2023-03-22 | Airbus Operations (S.A.S.) | Acoustic treatment panel comprising acoustic cells of different volumes obtained from cylindrical and identical main tubes, aircraft comprising such an acoustic treatment panel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150027629A1 (en) * | 2013-07-29 | 2015-01-29 | The Boeing Company | Septumization of Honeycomb Sandwiches |
| FR3026122A1 (en) * | 2014-09-24 | 2016-03-25 | Snecma | ACOUSTIC TREATMENT PANEL |
-
2018
- 2018-11-16 FR FR1871557A patent/FR3088658B1/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150027629A1 (en) * | 2013-07-29 | 2015-01-29 | The Boeing Company | Septumization of Honeycomb Sandwiches |
| FR3026122A1 (en) * | 2014-09-24 | 2016-03-25 | Snecma | ACOUSTIC TREATMENT PANEL |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230003176A1 (en) * | 2020-03-04 | 2023-01-05 | Safran Nacelles | Method for manufacturing a structure with cellular cores for a turbojet nacelle |
| FR3113169A1 (en) * | 2020-07-31 | 2022-02-04 | Airbus Operations | Process for manufacturing an acoustic panel with a capsular skin and acoustic panel incorporating such a skin |
| US11952136B2 (en) | 2020-07-31 | 2024-04-09 | Airbus Operations Sas | Method for manufacturing an acoustic panel having a capsular skin, and acoustic panel incorporating such a skin |
| EP4152313A1 (en) * | 2021-09-20 | 2023-03-22 | Airbus Operations (S.A.S.) | Acoustic treatment panel comprising acoustic cells of different volumes obtained from cylindrical and identical main tubes, aircraft comprising such an acoustic treatment panel |
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| Publication number | Publication date |
|---|---|
| FR3088658B1 (en) | 2021-10-29 |
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