EP0897174A1 - Shallwiederstandfähige Schicht; methode zur Herstellung derselben und schalldamfendes Element, das zumindest eine solche Schicht aufweist - Google Patents

Shallwiederstandfähige Schicht; methode zur Herstellung derselben und schalldamfendes Element, das zumindest eine solche Schicht aufweist Download PDF

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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
Application number
EP98450013A
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English (en)
French (fr)
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EP0897174B1 (de
Inventor
Alain Porte
Robert Andre
Hervé Batard
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.)
Airbus Operations SAS
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Airbus Group SAS
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Filing date
Publication date
Application filed by Airbus Group SAS filed Critical Airbus Group SAS
Publication of EP0897174A1 publication Critical patent/EP0897174A1/de
Application granted granted Critical
Publication of EP0897174B1 publication Critical patent/EP0897174B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • 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.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Laminated Bodies (AREA)
EP98450013A 1997-08-13 1998-08-06 Schalldämpfende Platte, die zumindest eine Schallwiderstandfähige Schicht aufweist, und deren Herstellungsmethode Expired - Lifetime EP0897174B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9710490 1997-08-13
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

Publications (2)

Publication Number Publication Date
EP0897174A1 true EP0897174A1 (de) 1999-02-17
EP0897174B1 EP0897174B1 (de) 2003-11-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98450013A Expired - Lifetime EP0897174B1 (de) 1997-08-13 1998-08-06 Schalldämpfende Platte, die zumindest eine Schallwiderstandfähige Schicht aufweist, und deren Herstellungsmethode

Country Status (5)

Country Link
US (1) US6268038B1 (de)
EP (1) EP0897174B1 (de)
DE (1) DE69819424T2 (de)
ES (1) ES2210694T3 (de)
FR (1) FR2767411B1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1109150A2 (de) * 1999-12-17 2001-06-20 ISOLITH Leichtbauplattenwerk M. Hattinger Gesellschaft mbH Akustikplatte
WO2002043047A1 (de) * 2000-11-21 2002-05-30 Thomas Wiegel Schichtwerkstoff
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)

* Cited by examiner, † Cited by third party
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
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
US9656761B2 (en) 2014-04-30 2017-05-23 The Boeing Company Lipskin for a nacelle and methods of making 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
SG11201805312VA (en) * 2015-12-22 2018-07-30 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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US4600619A (en) * 1984-12-31 1986-07-15 The Boeing Company Continuously wound filament structure for use in noise attenuation element
EP0367135A2 (de) * 1988-11-01 1990-05-09 Fuji Jukogyo Kabushiki Kaisha Verbundplatte und Verfahren zu ihrer Herstellung
EP0509166A1 (de) * 1989-10-26 1992-10-21 Rohr Industries, Inc. Lärmdämpfende Wabenstruktur
GB2261846A (en) * 1991-11-27 1993-06-02 Salex Acoustic Materials Limit Acoustic composite material
US5364681A (en) * 1993-02-05 1994-11-15 Gencorp Inc. Acoustic lamina wall covering
JPH08323901A (ja) * 1995-05-30 1996-12-10 Kobe Steel Ltd 樹脂成形品
FR2735064A1 (fr) * 1995-06-09 1996-12-13 Aerospatiale Procede de fabrication d'une peau microporeuse en materiau composite

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US3166149A (en) * 1965-01-19 Damped-resonator acoustical panels
US3502171A (en) * 1968-05-31 1970-03-24 Boeing Co Composite laminar structure for noise attenuation of fast moving gas streams,and method of making the same
GB1274343A (en) * 1970-02-24 1972-05-17 Rolls Royce Improvements in or relating to acoustic linings
US4042745A (en) * 1976-07-14 1977-08-16 Cornwell Charles E Cementitious sound absorbing panels and sound absorbing sprayed wall structures
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Publication number Priority date Publication date Assignee Title
US4600619A (en) * 1984-12-31 1986-07-15 The Boeing Company Continuously wound filament structure for use in noise attenuation element
EP0367135A2 (de) * 1988-11-01 1990-05-09 Fuji Jukogyo Kabushiki Kaisha Verbundplatte und Verfahren zu ihrer Herstellung
EP0509166A1 (de) * 1989-10-26 1992-10-21 Rohr Industries, Inc. Lärmdämpfende Wabenstruktur
GB2261846A (en) * 1991-11-27 1993-06-02 Salex Acoustic Materials Limit Acoustic composite material
US5364681A (en) * 1993-02-05 1994-11-15 Gencorp Inc. Acoustic lamina wall covering
JPH08323901A (ja) * 1995-05-30 1996-12-10 Kobe Steel Ltd 樹脂成形品
FR2735064A1 (fr) * 1995-06-09 1996-12-13 Aerospatiale Procede de fabrication d'une peau microporeuse en materiau composite

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PATENT ABSTRACTS OF JAPAN vol. 097, no. 004 30 April 1997 (1997-04-30) *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1109150A2 (de) * 1999-12-17 2001-06-20 ISOLITH Leichtbauplattenwerk M. Hattinger Gesellschaft mbH Akustikplatte
EP1109150A3 (de) * 1999-12-17 2001-09-05 ISOLITH Leichtbauplattenwerk M. Hattinger Gesellschaft mbH Akustikplatte
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 (de) * 2000-11-21 2002-05-30 Thomas Wiegel Schichtwerkstoff
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 (en) * 2020-05-28 2021-12-02 So.La.Is. - Societa' Lavorazione Isolanti - S.R.L. Con Unico Socio Method for producing a fiber muffler insert for an internal combustion engine of motor-vehicles

Also Published As

Publication number Publication date
DE69819424T2 (de) 2004-09-09
ES2210694T3 (es) 2004-07-01
US6268038B1 (en) 2001-07-31
DE69819424D1 (de) 2003-12-11
FR2767411B1 (fr) 2001-11-16
EP0897174B1 (de) 2003-11-05
FR2767411A1 (fr) 1999-02-19

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