EP0897174A1 - Couche acoustiquement résistive, procédé de fabrication de cette couche et panneau acoustiquement absorbant muni d'au moins une telle couche, ainsi que son procédé de fabrication - Google Patents
Couche acoustiquement résistive, procédé de fabrication de cette couche et panneau acoustiquement absorbant muni d'au moins une telle couche, ainsi que son procédé de fabrication Download PDFInfo
- Publication number
- EP0897174A1 EP0897174A1 EP98450013A EP98450013A EP0897174A1 EP 0897174 A1 EP0897174 A1 EP 0897174A1 EP 98450013 A EP98450013 A EP 98450013A EP 98450013 A EP98450013 A EP 98450013A EP 0897174 A1 EP0897174 A1 EP 0897174A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- mold
- acoustically resistive
- acoustic damping
- acoustic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
-
- 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
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24149—Honeycomb-like
Definitions
- the present invention relates to an acoustically resistive layer especially for applications in the manufacture of nacelle walls of aircraft engine engines and the process for manufacturing this layer but also an acoustically absorbent panel provided with at least one such layer.
- Helmholtz type resonators which allow reactive attenuation certain radial acoustic components under certain conditions of sizing and material.
- a resonator includes a structure honeycomb type honeycomb between two resistive layers.
- the alveolar structure plays the role of a cavity which makes it possible to attenuate in trapping them, some noisy frequencies reactively.
- the acoustically resistive layer has, in addition to its role of partitioning of the alveolar structure, a dissipative role, i.e. it transforms acoustic energy into heat.
- the present invention relates more particularly to the production of a acoustically resistive layer which provides attenuation physics by converting acoustic energy into heat, especially incident waves.
- a first example consists in using a sheet as a resistive layer perforated in metallic or composite material, which allows to obtain a single layer, good structural strength and good control of open surface rates.
- this type of layer has a high non-linearity acoustic, high dependence on tangential flows and low resistance to erosion in the case of a composite layer.
- a second example is the combination of a perforated sheet with a metallic or composite fabric.
- the layer is double, which requires a process delicate, long and costly assembly with risks of non-homogeneity acoustics if this assembly presents disparities as well as risks of corrosion.
- the choice of materials can be imposed by assembly needs.
- a third example of the prior art consists in combining a mesh and a metallic or composite fabric.
- the structural strength is good and the acoustic non-linearity and flow dependence phenomena are moderate.
- the acoustic surface uniformity is open to criticism with risks of aerodynamic relief. Repeatability is difficult to achieve and adjusting the open area ratio of the mesh is difficult due to a dispersion in manufacturing and especially due to the unavailability of wire mesh adjustable surface area.
- the object of the present invention is to provide a layer acoustically resistive to open area rate easily and precisely adjustable that meets acoustic objectives, which meets imperatives structural to resist depressions in flight, the weight of a man in certain parts as well as the aerodynamic and inertial forces of the entry of the air towards the crankcase for example in the particular case of a nacelle of aircraft engine.
- this material must also allow to resist the phenomenon of "fan blade off", that is to say bursting phenomenon of a blade.
- the acoustically resistive layer according to the invention must also resist the erosion caused by the penetration of sand into the air flows, at electrical phenomena such as sweeping lightning or corrosion.
- This resistive layer must also allow adjustment of the properties, both mechanical and acoustic, by the combination of two materials whose assembly does not pose problems.
- the present invention also relates to the process for manufacturing this resistive layer as well as an acoustic panel made with this resistive layer.
- the present invention also relates to a method of manufacturing a sound absorption panel provided with a resistive layer according to the invention as well as the panel obtained.
- the acoustically resistive layer according to the invention comprising at least one layer of acoustic damping fabric and a reinforcing material, is characterized in that this reinforcing material comprises yarns, with an adjustable open area ratio, secured to said fabric acoustic damping.
- wires are arranged unidirectionally, bidirectionally or still multidirectionally.
- the invention also relates to a method for manufacturing a layer acoustically resistive which consists of placing the damping fabric acoustic on a mold conforming to the profile of the layer to be obtained and to place on this acoustic damping fabric wires impregnated with a binder by filament winding and removing the layer thus obtained from the mold.
- the binder will have an adhesion capacity allowing it to remain attached to the acoustic fabric during handling, before hardening end of the panel, without additional operation.
- the method consists in placing the fabric acoustic damping on a mold conforming to the profile of the layer to obtain and arrange on this acoustic damping fabric the wires impregnated with a binder by removal and application by pressure and to remove the layer thus obtained from the mold.
- the binder will have a capacity adhesion allowing it to remain integral with the acoustic fabric during handling, before the final hardening of the panel, without operation additional.
- the invention also relates to the panels thus obtained which comprise at least one external resistive layer added to one of the faces of a core with honeycomb structure, the other side of which includes a total reflector or several souls with alveolar structure superimposed with interposition between these cores of a septum of the acoustically resistive layer type.
- the invention also covers the acoustic damping panel. got.
- the invention also covers the acoustic damping panel. obtained by implementing this variant of the process.
- FIG. 1 there is shown an acoustically resistive layer 10 according to the invention which comprises an acoustic damping fabric 12 and a reinforcement ply 14 based on threads 16.
- wires means wires, bands of yarn, strands, braids or strands of yarn, of square, round or rectangular.
- mold indifferently a static mold, a mold movable in translation or even a mandrel movable in rotation.
- tablecloth it can correspond to several thicknesses of mono or multidirectional wires.
- the acoustic damping fabric 12 is for example a fabric made in stainless steel mesh and sold under the GANTOIS brand.
- the ply 14 of reinforcement is unique and includes unidirectional wires oriented according to the weft or warp direction of the acoustic damping fabric such as shown in Figure 1 or in a direction making an angle any with the weft or warp threads.
- the yarn density of the added ply is adjusted according to the rate acoustic opening required, mechanical resistance desired, depending on the nature of the threads, their cross-section, the damping fabric acoustics whose damping qualities must be preserved, depending on the panel on which said acoustically resistive layer is to be applied and depending on the binder used to attach this layer to the fabric acoustic damping.
- the acoustically resistive layer 10 with the same acoustic fabric 12 but with a bidirectional sheet 114, the crossing of the wires at an angle of 90 °, oriented parallel to the weft and warp threads of the acoustic damping fabric such as shown in Figure 2 or at any angle.
- the ply 214 is bidirectional with an orientation wires at an angle other than 90 °, these wires themselves making an angle different from 90 ° with the weft and warp threads of the cushioning fabric acoustic.
- the ply 314 is multidirectional with different orientations between the ply yarns and the weft and chain of acoustic damping fabric.
- FIGS. 5A, 5B and 5C a block diagram of the process has been shown.
- manufacturing which consists of having a mold 18, in this case that of a nacelle of an aircraft engine, on which the fabric 12 is placed acoustic damping to make the first part of the layer resistive damping.
- the establishment of this fabric is advantageously made by wrapping for example if the fabric is in strips.
- step 5B winding which allows for a winding according to the steps and the desired angles, including varying them from place to place increase or decrease the density.
- the threads can be of different natures such as carbon threads, glass or "Kevlar” marketed by the firms BROCHIER or HEXEL.
- threads are coated with a binder as with a resin referenced 914 and sold by BROCHIER, which allows a good bond between the fabric and the threads of the sheet.
- the mold is represented in a simplified manner as being half a pod mold. In this case, the room is stationary and the bench is mobile but the reverse is just as achievable.
- the shaped layer is then removed from the mold for use in combination with other layers to form a panel having a surface opposite the noise source with resistive damping capacity.
- This monolithic layer can be added to one of the faces of a preformed panel with a honeycomb structure forming a core 22, of the type NIDA, with a total reflector 24, secured to the opposite side of the panel, of the same type as those shown in Figures 7C and 7D.
- This panel can also include an acoustic layer resistive, called external, several layers of NIDA superimposed and between two layers of NIDA superimposed, a septum is interposed in the form of a acoustically resistive layer according to the invention. It is therefore advisable to carry out layers with complementary characteristics and suitable for achieve the best depreciation, studies that are within the reach of man art.
- FIGS. 7A to 7E there is presented the block diagram of a method of production of a panel having at least one acoustically resistive layer, using filament winding for the placement of the reinforcement on the acoustic damping fabric. This is how the two first steps of Figures 7A and 7B are identical to steps 5A and 5B.
- step 7C provision is made to directly wind a core 22 in NIDA, on the sheet of wires, the connection being ensured either by crosslinking prior to NIDA, either by using the binder of the resistive layer.
- FIGS. 7A to 7E there is shown the pendant of what is shown in FIGS. 7A to 7E but with removal and application of the wires by pressure, and a deposition of the NIDA cores and of the total reflector by draping.
- the advantages of the resistive layer and of the panels according to the invention using this layer are many. In essence, it is possible to control and adjust the opening rate, carry out the deposits with a high accuracy and excellent repeatability, to meet objectives acoustic and structural requirements.
- Such layers allow good homogeneity to be obtained acoustics but also non-linearity and dependence on flow moderate tangential.
- the resistance to erosion is good and the risks of relief aerodynamics are removed.
- reinforcing wires can be placed directly on the mold and the acoustic damping fabric can be draped or banded on these wires according to the intended use of this panel and according to its conformation.
- the pitch of the reinforcing wires is not necessarily linked to the weft pitch or the warp pitch of the fabric acoustic damping. So all the reinforcing wire arrangements are included in the present invention as required.
- resistive layer thus produced in situ can follow any mold profile having a developable or non-developable shape.
- the manufacturing process makes it possible to obtain panels having complex shapes with punctual reserves to allow the realization openings or housings, this in all cases of winding of the wires the reinforcement ply, plain, bi or multidirectional.
Abstract
Description
- mise en place d'un moule conforme au profil du panneau à obtenir,
- dépose d'un tissu d'amortissement acoustique sur le moule,
- enroulement filamentaire de fils imprégnés d'un liant pour constituer une nappe sur le tissu d'amortissement acoustique,
- enroulement par banderolage ou drapage d'au moins une âme à structure alvéolaire sur cette nappe de fils, avec interposition d'une couche acoustiquement résistive entre deux âmes successives,
- enroulement ou drapage d'une couche finale d'un réflecteur acoustique total, et
- retrait du panneau du moule.
- mise en place d'un moule conforme au profil du panneau à obtenir,
- dépose d'un tissu d'amortissement acoustique sur le moule,
- dépose et application par pression de fils imprégnés d'un liant pour constituer une nappe sur le tissu d'amortissement acoustique, ,
- enroulement par banderolage ou drapage d'au moins une âme à structure alvéolaire sur cette nappe de fils, avec interposition d'une couche acoustiquement résistive entre deux âmes successives,
- enroulement ou drapage d'une couche finale d'un réflecteur acoustique total, et
- retrait du panneau du moule.
- la figure 1 représente un premier mode de réalisation de type unidirectionnel,
- la figure 2 représente un deuxième mode de type bidirectionnel avec un angle de croisement de 90°,
- la figure 3 représente un troisième mode de type bidirectionnel avec un angle de croisement identique mais de valeur quelconque,
- la figure 4 représente un quatrième mode de réalisation de type multidirectionnel,
- les figures 5A à 5C représentent un synoptique des étapes du procédé pour la réalisation d'une couche acoustiquement résistive selon l'invention par enroulement filamentaire,
- les figures 6A à 6C représentent un synoptique des étapes du procédé pour la réalisation d'une couche acoustiquement résistive selon l'invention par dépose et application par pression,
- les figures 7A à 7E représentent un synoptique des étapes du procédé pour la réalisation d'un panneau d'absorption acoustique ayant une couche acoustiquement résistive selon l'invention par enroulement filamentaire, et
- les figures 8A à 8E représentent un synoptique des étapes du procédé pour la réalisation d'un panneau d'absorption acoustique ayant une couche acoustiquement résistive selon l'invention par dépose et application par pression.
Claims (13)
- Couche acoustiquement résistive comprenant au moins une couche (12) de tissu d'amortissement acoustique et un matériau de renfort, caractérisée en ce que ce matériau de renfort comprend une nappe (14, 114, 214, 314) de fils (16), à taux de surface ouverte ajustable, solidarisés audit tissu d'amortissement acoustique.
- Couche acoustiquement résistive selon la revendication 1, caractérisée en ce que les fils (16) sont disposés unidirectionnellement.
- Couche acoustiquement résistive selon la revendication 1, caractérisée en ce que les fils (16) sont disposés bidirectionnellement.
- Couche acoustiquement résistive selon la revendication 1, caractérisée en ce que les fils (16) sont disposés multidirectionnellement.
- Procédé de fabrication d'une couche acoustiquement résistive selon la revendication 1,2, 3 ou 4, caractérisé en ce qu'il consiste à disposer le tissu (12) d'amortissement acoustique sur un moule (18) conforme au profil de la couche à obtenir et à disposer sur ce tissu d'amortissement acoustique des fils (16) imprégnés d'un liant par enroulement filamentaire et à retirer la couche ainsi obtenue du moule.
- Procédé de fabrication d'une couche acoustiquement résistive selon la revendication 1,2, 3 ou 4, caractérisé en ce qu'il consiste à disposer le tissu (12) d'amortissement acoustique sur un moule (18) conforme au profil de la couche à obtenir et à disposer sur ce tissu d'amortissement acoustique des fils (16) imprégnés d'un liant par dépose et application par pression et à retirer la couche ainsi obtenue du moule.
- Procédé de fabrication d'une couche acoustiquement résistive selon la revendication 5 ou 6, caractérisé en ce qu'on réalise une opération intermédiaire de durcissement du liant.
- Panneau d'amortissement acoustique utilisant la couche acoustiquement résistive selon l'une des revendications 1 à 4 et obtenue par la mise en oeuvre d'un des procédés selon la revendication 5, 6 ou 7, caractérisé en ce qu'il comprend au moins une couche (10) résistive externe rapportée sur l'une des faces d'une âme (22) à structure alvéolaire dont l'autre face comprend un réflecteur (24) total.
- Panneau d'amortissement acoustique selon la revendication 8, caractérisé en ce qu'il comprend plusieurs âmes (22) à structure alvéolaire superposées avec interposition entre ces âmes d'un septum du type couche (10) acoustiquement résistive.
- Procédé de fabrication d'un panneau acoustique comprenant une couche acoustiquement résistive selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'il comprend les étapes suivantes, dans cet ordre ou dans l'ordre inverse :mise en place d'un moule conforme au profil du panneau à obtenir,dépose d'un tissu d'amortissement acoustique sur le moule,enroulement filamentaire de fils imprégnés d'un liant pour constituer une nappe sur le tissu d'amortissement acoustique pour obtenir un ensemble monolithique,enroulement par banderolage ou drapage d'au moins une âme à structure alvéolaire sur cette nappe de fils, avec interposition d'une couche acoustiquement résistive entre deux âmes successives,enroulement ou drapage d'une couche finale d'un réflecteur acoustique total, etretrait du panneau du moule.
- Panneau d'amortissement acoustique obtenu par la mise en oeuvre du procédé selon la revendication 10.
- Procédé de fabrication d'un panneau acoustique comprenant une couche acoustiquement résistive selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'il comprend les étapes suivantes dans cet ordre ou dans l'ordre inverse :mise en place d'un moule conforme au profil du panneau à obtenir,dépose d'un tissu d'amortissement acoustique sur le moule,dépose et application par pression de fils imprégnés d'un liant pour constituer une nappe sur le tissu d'amortissement acoustique pour obtenir un ensemble monolithique,enroulement par banderolage ou drapage d'au moins une âme à structure alvéolaire sur cette nappe de fils, avec interposition d'une couche acoustiquement résistive entre deux âmes successives,enroulement ou drapage d'une couche finale d'un réflecteur acoustique total, etretrait du panneau du moule après durcissement du liant.
- Panneau d'amortissement acoustique obtenu par la mise en oeuvre du procédé selon la revendication 12.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9710490A FR2767411B1 (fr) | 1997-08-13 | 1997-08-13 | Couche acoustiquement resistive, procede de fabrication de cette couche et panneau acoustiquement absorbant muni d'au moins une telle couche |
FR9710490 | 1997-08-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0897174A1 true EP0897174A1 (fr) | 1999-02-17 |
EP0897174B1 EP0897174B1 (fr) | 2003-11-05 |
Family
ID=9510386
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98450013A Expired - Lifetime EP0897174B1 (fr) | 1997-08-13 | 1998-08-06 | Panneau acoustiquement absorbant muni d'au moins une couche acoustiquement résistive, ainsi que son procédé de fabrication |
Country Status (5)
Country | Link |
---|---|
US (1) | US6268038B1 (fr) |
EP (1) | EP0897174B1 (fr) |
DE (1) | DE69819424T2 (fr) |
ES (1) | ES2210694T3 (fr) |
FR (1) | FR2767411B1 (fr) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1109150A2 (fr) * | 1999-12-17 | 2001-06-20 | ISOLITH Leichtbauplattenwerk M. Hattinger Gesellschaft mbH | Panneau acoustique |
WO2002043047A1 (fr) * | 2000-11-21 | 2002-05-30 | Thomas Wiegel | Materiau stratifie |
US6607625B2 (en) * | 1999-12-24 | 2003-08-19 | Eads Airbus Sa | Process for the production of an acoustively resistive layer, resistive layer thus obtained, and wall using such layer |
FR2933224A1 (fr) * | 2008-06-25 | 2010-01-01 | Aircelle Sa | Panneau accoustique pour une tuyere d'ejection |
WO2011061430A1 (fr) * | 2009-11-23 | 2011-05-26 | Aircelle | Panneau acoustique pour nacelle d'aeronef |
IT202000012694A1 (it) * | 2020-05-28 | 2021-11-28 | So La Is Soc Lavorazione Isolanti S R L Con Unico Socio | Metodo per realizzare un inserto silenziatore in fibra per motori a combustione interna di autoveicoli |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2818581B1 (fr) | 2000-12-21 | 2003-03-28 | Eads Airbus Sa | Procede de fabrication d'un panneau a couche d'amortissement acoustique protegee et panneau acoustique ainsi obtenu |
FR2821788B1 (fr) | 2001-03-09 | 2004-04-02 | Eads Airbus Sa | Procede de fabrication d'un panneau a couche resistive acoustique adaptee et panneau acoustique ainsi obtenu |
FR2841031B1 (fr) * | 2002-06-17 | 2005-02-11 | Hurel Hispano Le Havre | Procede de fabrication d'un panneau acoustique a double resonateur |
FR2844304B1 (fr) | 2002-09-10 | 2004-12-10 | Airbus France | Couche acoustiquement resistive pour panneau d'attenuation acoustique, panneau utilisant une telle couche |
FR2865309B1 (fr) * | 2004-01-15 | 2006-09-08 | Hurel Hispano | Peau perforee pour element acoustique, element acoustique et procede de fabrication |
US20070104934A1 (en) * | 2005-11-10 | 2007-05-10 | General Electric Company | Lightweight nacelle for turbines and methods for making same |
DE102008006030A1 (de) * | 2008-01-25 | 2009-07-30 | Robert Bosch Gmbh | Handwerkzeugmaschine, insbesondere elektrisch betriebene Handwerkzeugmaschine |
DE102011008920A1 (de) * | 2011-01-19 | 2012-07-19 | Rolls-Royce Deutschland Ltd & Co Kg | Schallabsorber, insbesondere für einen Gasturbinenabgaskonus und Verfahren zu dessen Herstellung |
US8607924B2 (en) * | 2011-09-08 | 2013-12-17 | Hexcel Corporation | Anchoring of septums in acoustic honeycomb |
US9656761B2 (en) | 2014-04-30 | 2017-05-23 | The Boeing Company | Lipskin for a nacelle and methods of making the same |
US9604438B2 (en) | 2014-04-30 | 2017-03-28 | The Boeing Company | Methods and apparatus for noise attenuation in an engine nacelle |
US9938852B2 (en) | 2014-04-30 | 2018-04-10 | The Boeing Company | Noise attenuating lipskin assembly and methods of assembling the same |
US9708072B2 (en) | 2014-04-30 | 2017-07-18 | The Boeing Company | Aircraft engine nacelle bulkheads and methods of assembling the same |
US9290274B2 (en) | 2014-06-02 | 2016-03-22 | Mra Systems, Inc. | Acoustically attenuating sandwich panel constructions |
US11211041B2 (en) * | 2015-12-22 | 2021-12-28 | Razer (Asia-Pacific) Pte. Ltd. | Mesh assemblies, computing systems, and methods for manufacturing a mesh assembly |
US10793282B2 (en) | 2016-07-28 | 2020-10-06 | The Boeing Company | Liner assembly, engine housing, and methods of assembling the same |
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- 1998-08-06 ES ES98450013T patent/ES2210694T3/es not_active Expired - Lifetime
- 1998-08-06 DE DE69819424T patent/DE69819424T2/de not_active Expired - Lifetime
- 1998-08-13 US US09/133,678 patent/US6268038B1/en not_active Expired - Lifetime
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EP0367135A2 (fr) * | 1988-11-01 | 1990-05-09 | Fuji Jukogyo Kabushiki Kaisha | Panneau composite et procédé de fabrication |
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Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1109150A2 (fr) * | 1999-12-17 | 2001-06-20 | ISOLITH Leichtbauplattenwerk M. Hattinger Gesellschaft mbH | Panneau acoustique |
EP1109150A3 (fr) * | 1999-12-17 | 2001-09-05 | ISOLITH Leichtbauplattenwerk M. Hattinger Gesellschaft mbH | Panneau acoustique |
US6607625B2 (en) * | 1999-12-24 | 2003-08-19 | Eads Airbus Sa | Process for the production of an acoustively resistive layer, resistive layer thus obtained, and wall using such layer |
WO2002043047A1 (fr) * | 2000-11-21 | 2002-05-30 | Thomas Wiegel | Materiau stratifie |
US8640825B2 (en) | 2008-06-25 | 2014-02-04 | Aircelle | Acoustic panel for an ejector nozzle |
WO2010007263A1 (fr) * | 2008-06-25 | 2010-01-21 | Aircelle | Panneau acoustique pour une tuyère d'éjection |
FR2933224A1 (fr) * | 2008-06-25 | 2010-01-01 | Aircelle Sa | Panneau accoustique pour une tuyere d'ejection |
WO2011061430A1 (fr) * | 2009-11-23 | 2011-05-26 | Aircelle | Panneau acoustique pour nacelle d'aeronef |
FR2953058A1 (fr) * | 2009-11-23 | 2011-05-27 | Aircelle Sa | Peau acoustique pour un panneau acoustique d'une nacelle d'aeronef |
CN102667916A (zh) * | 2009-11-23 | 2012-09-12 | 埃尔塞乐公司 | 用于飞行器的发动机机舱的声学板的声学表层 |
US8646574B2 (en) | 2009-11-23 | 2014-02-11 | Aircelle | Acoustic skin for an aircraft nacelle acoustic panel |
RU2550318C2 (ru) * | 2009-11-23 | 2015-05-10 | Эрсель | Акустическая оболочка для акустической панели гондолы летательного аппарата |
IT202000012694A1 (it) * | 2020-05-28 | 2021-11-28 | So La Is Soc Lavorazione Isolanti S R L Con Unico Socio | Metodo per realizzare un inserto silenziatore in fibra per motori a combustione interna di autoveicoli |
WO2021240462A1 (fr) * | 2020-05-28 | 2021-12-02 | So.La.Is. - Societa' Lavorazione Isolanti - S.R.L. Con Unico Socio | Procédé de fabrication d'un insert de silencieux fibreux pour un moteur à combustion interne de véhicules automobile |
Also Published As
Publication number | Publication date |
---|---|
EP0897174B1 (fr) | 2003-11-05 |
FR2767411B1 (fr) | 2001-11-16 |
ES2210694T3 (es) | 2004-07-01 |
US6268038B1 (en) | 2001-07-31 |
DE69819424T2 (de) | 2004-09-09 |
FR2767411A1 (fr) | 1999-02-19 |
DE69819424D1 (de) | 2003-12-11 |
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