EP0897174B1 - Schalldämpfende Platte, die zumindest eine Schallwiderstandfähige Schicht aufweist, und deren Herstellungsmethode - Google Patents

Schalldämpfende Platte, die zumindest eine Schallwiderstandfähige Schicht aufweist, und deren Herstellungsmethode Download PDF

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Publication number
EP0897174B1
EP0897174B1 EP98450013A EP98450013A EP0897174B1 EP 0897174 B1 EP0897174 B1 EP 0897174B1 EP 98450013 A EP98450013 A EP 98450013A EP 98450013 A EP98450013 A EP 98450013A EP 0897174 B1 EP0897174 B1 EP 0897174B1
Authority
EP
European Patent Office
Prior art keywords
sound damping
layer
threads
reinforcing material
panel
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.)
Expired - Lifetime
Application number
EP98450013A
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English (en)
French (fr)
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EP0897174A1 (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 Operations SAS
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Filing date
Publication date
Application filed by Airbus Operations SAS filed Critical Airbus Operations SAS
Publication of EP0897174A1 publication Critical patent/EP0897174A1/de
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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 absorbent panel provided with at least one acoustically resistive layer especially for applications in the manufacture of nacelle walls of aircraft engine engines and the method of manufacturing this panel.
  • Helmholtz type resonators that 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 area 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 surface area of the mesh is difficult due to 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 panel comprising a layer acoustically resistive to open area rate easily and precisely adjustable that meets acoustic objectives, which meets imperatives structural to withstand 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 subject of the present invention is 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.
  • 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 panel comprising a layer acoustically resistive which consists in 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 of 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 relates to the acoustic damping panel. got.
  • the invention also relates to the acoustic damping panel. obtained by the implementation of 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, in depending on the nature of the wires, 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 production process has been shown.
  • manufacturing which consists in 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 carried out by wrapping for example if the fabric is in strips.
  • step 5B winding which makes it possible to carry out 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.
  • wires are coated with a binder as with a resin referenced 914 and marketed by BROCHIER, which allows a good bond between the fabric and the tablecloth threads.
  • 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 the block diagram of a method of presentation has been presented. production of a panel having at least one acoustically resistive layer, by 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 it is planned 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.
  • 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 can be used 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 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)

Claims (8)

  1. Schalldämpfungsplatte, die wenigstens einen Kern (22) mit Wabenstruktur, einen Totalreflektor (24), der auf eine Fläche eines Kerns (32) gegenüber der auftreffenden Schallwelle aufgebracht ist, und wenigstens eine Schallwiderstandslage, wovon eine auf eine Fläche eines Kerns, die der auftreffenden Schallwelle zugewandt ist, aufgebracht ist, umfaßt, wobei die schallbeständige Lage aus einer Lage (12) eines Schalldämpfungsgewebes und aus einem mit dem Schalldämpfungsgewebe verbundenen Verstärkungsmaterial gebildet ist, dadurch gekennzeichnet, daß das Verstärkungsmaterial wenigstens aus einem nicht gewebten Vlies (16) gebildet ist, dessen Dichte in Abhängigkeit vom gewünschten Anteil der offenen Oberfläche eingestellt ist.
  2. Schalldämpfungsplatte nach Anspruch 1, dadurch gekennzeichnet, daß sie mehrere Kerne (22) mit Wabenstruktur umfaßt, die jeweils mit einem zwischen diesen Kernen angeordneten Septum übereinandergelegt sind, wobei das Septum aus einer Lage (12) eines Schalldämpfungsgewebes und aus wenigstens einem nicht gewebtem Vlies (16) gebildet ist, dessen Dichte in Abhängigkeit vom gewünschten Anteil der offenen Oberfläche eingestellt ist und das mit dem Schalldämpfungsgewebe fest verbunden ist.
  3. Schalldämpfungsplatte nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Fasern des Verstärkungsmaterials in einer Richtung angeordnet sind.
  4. Schalldämpfungsplatte nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Fasern des Verstärkungsmaterials in zwei Richtungen angeordnet sind.
  5. Schalldämpfungsplatte nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Fasern des Verstärkungsmaterials in mehreren Richtungen angeordnet sind.
  6. Verfahren zur Herstellung einer Schalldämpfungsplatte, das in dieser Reihenfolge oder in einer anderen Reihenfolge die folgenden Schritte umfaßt:
    Anordnen einer Form, die mit dem Profil der zu erhaltenden Platte übereinstimmt,
    Ablegen eines Schalldämpfungsgewebes in der Form,
    Ablegen eines Verstärkungsmaterials, das mit dem Schalldämpfungsgewebe fest verbunden ist,
    Wickeln wenigstens eines Kerns mit Wabenstruktur auf dieses Vlies durch Umwickeln oder Raffen, wobei zwischen zwei aufeinanderfolgende Kerne eventuell eine schallwiderständige Lage eingefügt wird,
    Wickeln oder Raffen einer abschließenden Lage aus einem Schall-Totalreflektor und
    Entnehmen der Platte aus der Form,
       dadurch gekennzeichnet, daß das Ablegen des Verstärkungsmaterials darin besteht, mit einem Bindemittel imprägnierte Fasern abzulegen, um auf dem Schalldämpfungsgewebe ein nicht gewebtes Vlies (16) zu bilden, dessen Dichte in Abhängigkeit vom gewünschten Anteil der offenen Oberfläche eingestellt wird.
  7. Verfahren zur Herstellung einer Schalldämpfungsplatte nach Anspruch 6, dadurch gekennzeichnet, daß das Ablegen von Fasern aus Verstärkungsmaterial durch Filamentwicklung ausgeführt wird.
  8. Verfahren zur Herstellung einer Schalldämpfungsplatte nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß eine Zwischenoperation zur Härtung des Bindemittels ausgeführt wird.
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 EP0897174A1 (de) 1999-02-17
EP0897174B1 true EP0897174B1 (de) 2003-11-05

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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)

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

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1109150A3 (de) * 1999-12-17 2001-09-05 ISOLITH Leichtbauplattenwerk M. Hattinger Gesellschaft mbH Akustikplatte
FR2803077B1 (fr) * 1999-12-24 2002-07-26 Aerospatiale Matra Airbus Procede de realisation d'une couche acoustiquement resistive, couche resistive obtenue et paroi utilisant une telle couche
AU2001228261A1 (en) * 2000-11-21 2002-06-03 Thomas Wiegel Layered material
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
FR2933224B1 (fr) * 2008-06-25 2010-10-29 Aircelle Sa Panneau accoustique pour une tuyere d'ejection
FR2953058B1 (fr) * 2009-11-23 2017-11-03 Aircelle Sa Peau acoustique pour un panneau acoustique d'une nacelle d'aeronef
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
US9656761B2 (en) 2014-04-30 2017-05-23 The Boeing Company Lipskin for a nacelle and methods of making the same
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
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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US3640357A (en) * 1970-02-24 1972-02-08 Rolls Royce Acoustic linings

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4042745A (en) * 1976-07-14 1977-08-16 Cornwell Charles E Cementitious sound absorbing panels and sound absorbing sprayed wall structures
US4073998A (en) * 1977-01-24 1978-02-14 Bay Mills Limited Scrim/foil laminate
US4600619A (en) * 1984-12-31 1986-07-15 The Boeing Company Continuously wound filament structure for use in noise attenuation element
JPH02122923A (ja) * 1988-11-01 1990-05-10 Fuji Heavy Ind Ltd 複合材パネルおよびその製造方法
US5041323A (en) * 1989-10-26 1991-08-20 Rohr Industries, Inc. Honeycomb noise attenuation structure
GB9125205D0 (en) * 1991-11-27 1992-01-29 Salex Acoustic Materials Limit Improvements in acoustic materials
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
FR2735064B1 (fr) * 1995-06-09 1997-08-29 Aerospatiale Procede de fabrication d'une peau microporeuse en materiau composite

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US3640357A (en) * 1970-02-24 1972-02-08 Rolls Royce Acoustic linings

Also Published As

Publication number Publication date
FR2767411A1 (fr) 1999-02-19
DE69819424T2 (de) 2004-09-09
DE69819424D1 (de) 2003-12-11
FR2767411B1 (fr) 2001-11-16
EP0897174A1 (de) 1999-02-17
US6268038B1 (en) 2001-07-31
ES2210694T3 (es) 2004-07-01

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