EP0935235A2 - Sandwich-type wall - Google Patents

Sandwich-type wall Download PDF

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Publication number
EP0935235A2
EP0935235A2 EP99102139A EP99102139A EP0935235A2 EP 0935235 A2 EP0935235 A2 EP 0935235A2 EP 99102139 A EP99102139 A EP 99102139A EP 99102139 A EP99102139 A EP 99102139A EP 0935235 A2 EP0935235 A2 EP 0935235A2
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EP
European Patent Office
Prior art keywords
sandwich wall
fiber composite
cover
wall according
sandwich
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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.)
Ceased
Application number
EP99102139A
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German (de)
French (fr)
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EP0935235A3 (en
Inventor
Horst Dr. Bansemir
Walter Gembler
Ottmar Haider
Christian Ritzer
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Airbus Helicopters Deutschland GmbH
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Eurocopter Deutschland GmbH
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Publication date
Application filed by Eurocopter Deutschland GmbH filed Critical Eurocopter Deutschland GmbH
Publication of EP0935235A2 publication Critical patent/EP0935235A2/en
Publication of EP0935235A3 publication Critical patent/EP0935235A3/en
Ceased 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
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects

Definitions

  • the invention relates to a sandwich wall, in particular for a Helicopter cell, according to the preamble of claim 1.
  • the object of the invention is a sandwich wall of the aforementioned Art to create a low weight and manufacturing effort effective sound insulation.
  • the cover skin as a fiber composite network combined with a flexible cover film with the inner core consisting of hollow bodies a high grade Sound absorption in the sandwich wall with a variety of each Hollow bodies of the inner core formed individual resonators achieved, and at the same time become the basis weight based on the required strength and rigidity and the manufacturing costs for the sandwich structure, the Fiber composite network with no problem, for example by means of the winding process can produce the required mesh size, kept extremely small, so that the invention of the requirement of helicopter construction for a lightweight structure, in which excellent sound insulation properties with a combine high load resistance, fully complies with.
  • the hollow bodies are particularly preferred Embodiment according to claim 4 different cavity heights.
  • the second cover skin not from a fiber composite network, but as a closed To form fiber composite cover layer, the resulting Weight gain through an increased sound absorption effect Sandwich wall is balanced.
  • this cover skin consists of a closed fiber composite cover layer, as a soundproofing layer, as preferred according to claim 10, a foam layer inserted between the fiber composite cover layer and the inner core be provided.
  • a soundproofing layer a soundproofing film on a forming the second cover skin Fiber composite network applied.
  • the sandwich wall can easily be used as an interior lining or use non-load-bearing partition, however, because of the high constructive strength with low weight according to claim 12 preferably as an integral part of a support structure, in particular a helicopter cell.
  • the cover skins exist primarily for cost reasons preferably from a glass fiber composite.
  • the sandwich wall 2 shown in Fig. 1 contains one by standing upright Hollow body 4 formed, specifically light inner core in the form of a Honeycomb core 6 and two outer fiber composite cover skins glued to the honeycomb core 6 8, 10.
  • the first, the main direction of incidence H of the sound facing cover skin 8 consists of an open-mesh, e.g. in the way of the winding process fiber composite network 12 with depending on the required load strength differently oriented, according to FIG. 1 at 90 ° crossing fiber strands 14, the mesh size of the fiber composite network 12 significantly smaller than the internal cross section of the hollow body 6 is dimensioned.
  • the fiber composite network 12 is on the outside a flexible, thin-walled cover sheet 16, such as under the The designation "Kapton film" is commercially available.
  • the second cover skin 10 on the other hand, consists of a continuous closed fiber composite layer.
  • the cover skins 8, 10 are made of a glass fiber composite and are connected to the honeycomb core 6 in each case via an adhesive film 18, 20.
  • the adhesive via the net mesh aspirated so that the excess glue is removed, which the Basis weight of the finished sandwich wall 2 reduced, but above all ensured is that the mesh of the fiber composite network 12 is not Adhesive residues are added.
  • the individual honeycomb cells 4 of the honeycomb core 6 act in this way together with the fiber composite network 12 and the applied to it Cover film 16 each facing the direction of sound H, on the Cavity resonators closed by the fiber composite layer 10 with an excellent absorption behavior, which according to the selected cavity and mesh size, but also in Depending on the cover film 16 used can be influenced. So lets a narrow-band absorption behavior with a closed cover film 16 with an absorption level of almost 100%, while itself when using a finely perforated or microperforated Cover foil 16 is a less pronounced one in the resonance range, but instead but can achieve significantly broadband sound absorption.
  • Fig. 2 where the components corresponding to the first embodiment are identified by a reference symbol increased by 100, shows a Sandwich wall 102, in contrast to the first embodiment a damping layer 22 made of foam on the side of the closed Fiber composite layer 110 is inserted into the inner core 106.
  • the soundproofing effect of the sandwich wall 102 becomes apparent broadband noise reduction improved. Otherwise, the construction and Operation of the sandwich wall 102 is the same as in the first embodiment.
  • each of the two cover skins 208, 210 consists of a fiber composite network 212, which is covered on the outside with a flexible cover film 216 is.
  • the sandwich wall 202 is therefore in terms of sound incidence Direction of both outer skins 208, 210 designed equally sound-absorbing.
  • the honeycomb core 206 is opposite to the cover skins 208, 210 inclined partition 24 in two parts, so that the Honeycomb cells have different cavity heights and thus the absorption maximum of the individual resonators formed in this way in different, largely uniform over a broad frequency band distributed frequency ranges. Otherwise, the construction and operation sandwich wall 202 is substantially the same as the previous ones Embodiments.
  • the sandwich wall 302 is an integral part integrated in a support structure 26, for example a helicopter cell.
  • the sandwich wall 302 again consists of an inner honeycomb core 306 and two outer, each by a fiber composite network 312 and a cover sheet 316 formed cover skins 308, 310 and is in view of the loads acting as a highly rigid and strong lightweight board.
  • the load-resistant connection of the sandwich wall 302 to the support structure 26 takes place by means of fiber composite Doppler 28.
  • the installation position of the Sandwich wall 302 is chosen so that the top cover 308 the Main sound sources forming helicopter units, that is about Main gearbox is turned.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Building Environments (AREA)
  • Laminated Bodies (AREA)

Abstract

A sound absorbing sandwich panel has a central core with a honeycomb structure (4) with the hollow cells aligned at right angles across the width of the panel. The outer surfaces of the panel are completed by cover layers. The side nearest to the sound source is further fitted with an open mesh layer between the cover layer and the core. The mesh sizes are less than the diameters of the core elements and with the core elements form Helmholz resonators to absorb a range of frequencies. The core elements of the honeycomb can have a variety of cross sectional sizes.

Description

Die Erfindung bezieht sich auf eine Sandwichwand, insbesondere für eine Hubschrauberzelle, nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a sandwich wall, in particular for a Helicopter cell, according to the preamble of claim 1.

Es ist bekannt, den Innenraum von Hubschrauberkabinen mit Schalldämpfungsbelägen auszukleiden, um die Geräuschbelastungen im Kabineninneren, die in der Hauptsache vom Rotorgetriebe und weiteren Nebenaggregaten sowie dem Haupt- und Heckrotor des Hubschraubers verursacht werden, zu reduzieren. Derartige Schalldämpfungsbeläge erfordern jedoch, wenn sie in den verschiedenen Frequenzbereichen der erwähnten Hubschrauber-Lärmquellen wirksam sein sollen, einen sehr hohen Bau- und vor allem Gewichtsaufwand.It is known to fill the interior of helicopter cabins with soundproofing pads to line the noise levels inside the cabin, mainly from the rotor gear and other auxiliary units as well as the main and tail rotor of the helicopter, to reduce. However, such soundproofing coverings require if they are in the different frequency ranges mentioned Helicopter noise sources are said to be effective, a very high construction and especially weight.

Weiterhin ist aus der Publikation AGARD CONFERENCE PROCEEDINGS 549, "Impact of Acoustic Loads on Aircraft Structures", G. Niesl et al, Sept. 1994, eine Hubschrauber-Wandstruktur in Sandwichbauweise mit integrierter Schalldämmung bekannt, bei der die der Schallquelle zugekehrte Faserverbund-Deckschicht der Sandwichstruktur mit einer Vielzahl von Durchgangsbohrungen zu den einzelnen Wabenzellen des Sandwichkerns versehen ist, um die Wabenzellen auf diese Weise nach Art eines Helmholtz-Resonators für eine Schallabsorption in einem diskreten Frequenzbereich auszubilden. Dabei entstehen an den einzelnen Durchgangsbohrungen jedoch Faserunterbrechungen in der Faserverbund-Deckschicht, so daß die auf das Flächengewicht bezogene, spezifische Festigkeit der Sandwichstruktur bei größeren Bohrlochdichten signifikant abnimmt. Hinzu kommt, daß das Verbohren der Deckschicht einen erhöhten Fertigungsaufwand erfordert und das Innere der Sandwichstruktur für Witterungseinflüsse, etwa Feuchtigkeits- oder Staubablagerungen, zugänglich macht.Furthermore, from the publication AGARD CONFERENCE PROCEEDINGS 549, "Impact of Acoustic Loads on Aircraft Structures", G. Niesl et al, Sept. 1994, a helicopter wall structure in sandwich construction known with integrated sound insulation, where the sound source facing fiber composite top layer of the sandwich structure with a Variety of through holes to the individual honeycomb cells of the Sandwich core is provided to the honeycomb cells in this way according to Art of a Helmholtz resonator for sound absorption in a discrete Training frequency range. This creates the individual through holes however fiber interruptions in the fiber composite top layer, so that the specific strength related to the basis weight the sandwich structure decreases significantly with larger borehole densities. In addition, the drilling of the top layer increases Requires manufacturing effort and the interior of the sandwich structure for weather influences, such as moisture or dust deposits makes.

Aufgabe der Erfindung ist es, eine Sandwichwand der eingangs genannten Art zu schaffen, die mit geringem Gewichts- und Herstellungsaufwand einen wirksamen Schallschutz ergibt.The object of the invention is a sandwich wall of the aforementioned Art to create a low weight and manufacturing effort effective sound insulation.

Diese Aufgabe wird erfindungsgemäß durch die im Patentanspruch 1 gekennzeichnete Sandwichwand gelöst.This object is inventively characterized by that in claim 1 Sandwich wall solved.

Erfindungsgemäß wird aufgrund der besonderen Gestaltung der Deckhaut als mit einer flexiblen Deckfolie kombiniertes Faserverbundnetz in Verbindung mit dem aus Hohlkörpern bestehenden Innenkern eine hochgradige Schallabsorption in der Sandwichwand mit einer Vielzahl von jeweils an den Hohlkörpern des Innenkerns gebildeten Einzelresonatoren erzielt, und zugleich werden das auf die benötigte Festigkeit und Steifigkeit bezogene Flächengewicht sowie der Fertigungsaufwand für die Sandwichstruktur, deren Faserverbundnetz sich problemlos, etwa im Wege des Wickelverfahrens, mit der erforderlichen Maschengröße herstellen läßt, äußerst gering gehalten, so daß die Erfindung der Forderung des Hubschrauberbaus nach einer Leichtbaustruktur, in der sich hervorragende Schallschutzeigenschaften mit einer hohen Lastfestigkeit verbinden, in vollem Umfang nachkommt.According to the invention is due to the special design of the cover skin as a fiber composite network combined with a flexible cover film with the inner core consisting of hollow bodies a high grade Sound absorption in the sandwich wall with a variety of each Hollow bodies of the inner core formed individual resonators achieved, and at the same time become the basis weight based on the required strength and rigidity and the manufacturing costs for the sandwich structure, the Fiber composite network with no problem, for example by means of the winding process can produce the required mesh size, kept extremely small, so that the invention of the requirement of helicopter construction for a lightweight structure, in which excellent sound insulation properties with a combine high load resistance, fully complies with.

Zur Abschirmung schmalbandiger Frequenzbereiche hat sich gemäß Anspruch 2 die Verwendung einer geschlossenen Deckfolie als besonders vorteilhaft erwiesen. Hierdurch läßt sich ein hoher Absorptionsgrad bis nahezu 100% erreichen, mit dem weiteren Vorteil, daß ein Eindringen von Staub und Feuchtigkeit in die Hohlkörper des Sandwichkerns wirksam unterbunden wird. Andererseits wird ein breitbandiges Absorptionsverhalten der Sandwichwand dadurch erhalten, daß die Deckfolie, wie nach Anspruch 3 bevorzugt, perforiert oder porös ausgebildet ist.To shield narrow-band frequency ranges has according to claim 2 the use of a closed cover film is particularly advantageous proven. This allows a high degree of absorption to almost Achieve 100%, with the further advantage that dust penetration and moisture in the hollow body of the sandwich core is effectively prevented becomes. On the other hand, a broadband absorption behavior of the Sandwich wall obtained in that the cover film, as in claim 3 is preferred, perforated or porous.

Um in die Sandwichwand Schallresonatoren mit unterschiedlichen Absorptionskennlinien zu integrieren, besitzen die Hohlkörper in besonders bevorzugter Ausgestaltung nach Anspruch 4 voneinander verschiedene Hohlraumhöhen.To insert sound resonators with different absorption characteristics into the sandwich wall to integrate, the hollow bodies are particularly preferred Embodiment according to claim 4 different cavity heights.

Aus Gründen einer weiteren Gewichtsersparnis, aber auch um die Sandwichwand gleichermaßen für Schalleinfälle von der Innen- wie auch von der Außenseite schallabsorbierend auszubilden, bestehen beide Deckhäute nach Anspruch 5 vorzugsweise aus einem offenmaschigen, mit einer flexiblen Deckfolie belegten Faserverbundnetz. In diesem Fall wird eine besonders wirksame Schallabsorption bezüglich beidseitiger Schalleinwirkungen nach Anspruch 6 vorzugsweise dadurch erreicht, daß der Innenkern durch eine in Richtung der Flächenerstreckung der Deckhäute zwischen diesen verlaufende, geschlossene Trennwand zweiteilig ausgebildet ist, welche nach Anspruch 6 vorzugsweise bezüglich der Deckhäute schräg verläuft, wodurch sich auf herstellungsmäßig einfache Weise unterschiedliche Hohlraumhöhen und damit ein unterschiedliches Absorptionsverhalten an den einzelnen Hohlkörpern des Innenkerns erzielen lassen.For reasons of further weight savings, but also for the sandwich wall equally for sound incidence from the inside as well as from the Both outer skins are made to be sound-absorbing on the outside Claim 5 preferably from an open-mesh, with a flexible Cover foil covered fiber composite network. In this case, one becomes special effective sound absorption with regard to sound effects on both sides Claim 6 preferably achieved in that the inner core by a Direction of the surface area of the cover skins running between them, closed partition is formed in two parts, which according to Claim 6 preferably runs obliquely with respect to the outer skins, whereby different cavity heights in a simple manner and thus a different absorption behavior on the individual Let hollow bodies of the inner core be achieved.

In einigen Anwendungsfällen, etwa wenn die Sandwichwand an der der Schallquelle abgewandten Deckhaut eine glatte Oberfläche aufweisen oder einseitig verstärkt ausgebildet werden muß, empfiehlt es sich nach Anspruch 8, die zweite Deckhaut nicht aus einem Faserverbundnetz, sondern als geschlossene Faserverbund-Deckschicht auszubilden, wobei die dadurch bedingte Gewichtszunahme durch eine erhöhte Schallabsorptionswirkung der Sandwichwand ausgeglichen wird.In some applications, such as when the sandwich wall on the Cover skin facing away from the sound source has a smooth surface or must be trained on one side, it is recommended according to claim 8, the second cover skin not from a fiber composite network, but as a closed To form fiber composite cover layer, the resulting Weight gain through an increased sound absorption effect Sandwich wall is balanced.

Um zusätzlich zu der Schallabsorption an den einzelnen Hohlraumresonatoren auch noch eine Schalldämpfung an der der Hauptschallquelle abgewandten Sandwichseite zu erzielen, wie sich dies vor allem zur Geräuschminderung im Inneren von Hubschrauberkabinen empfiehlt, ist in besonders bevorzugter Weise nach Anspruch 9 die der Hauptschallquelle abgewandte Deckhaut der Sandwichwand mit einer Schalldämpfungsschicht versehen. Besteht diese Deckhaut aus einer geschlossenen Faserverbund-Deckschicht, so kann als Schalldämpfungsschicht, wie nach Anspruch 10 bevorzugt, eine zwischen Faserverbund-Deckschicht und Innenkern eingefügte Schaumstoffschicht vorgesehen sein. In besonders bevorzugter Weise ist jedoch nach Anspruch 11 - vor allem aus Gewichtsgründen - als Schalldämpfungsschicht eine Schalldämpfungsfolie auf ein die zweite Deckhaut bildendes Faserverbundnetz aufgebracht.In addition to the sound absorption at the individual cavity resonators also a sound attenuation on that facing away from the main sound source To achieve sandwich side, as this is mainly for noise reduction inside helicopter cabins is recommended in particular preferably according to claim 9 facing away from the main sound source Cover the sandwich wall with a soundproofing layer. If this cover skin consists of a closed fiber composite cover layer, as a soundproofing layer, as preferred according to claim 10, a foam layer inserted between the fiber composite cover layer and the inner core be provided. However, it is particularly preferred according to claim 11 - especially for weight reasons - as a soundproofing layer a soundproofing film on a forming the second cover skin Fiber composite network applied.

Zwar läßt sich die Sandwichwand ohne weiteres als Innenverkleidung oder nicht-tragende Zwischenwand verwenden, wird jedoch wegen der hohen konstruktiven Festigkeit bei zugleich geringem Eigengewicht nach Anspruch 12 vorzugsweise als integraler Bestandteil einer Tragstruktur, insbesondere einer Hubschrauberzelle, ausgebildet.The sandwich wall can easily be used as an interior lining or use non-load-bearing partition, however, because of the high constructive strength with low weight according to claim 12 preferably as an integral part of a support structure, in particular a helicopter cell.

Nach Anspruch 13 schließlich bestehen die Deckhäute vor allem aus Kostengründen vorzugsweise aus einem Glasfaserverbund.Finally, according to claim 13, the cover skins exist primarily for cost reasons preferably from a glass fiber composite.

Die Erfindung wird nunmehr anhand mehrerer Ausführungsbeispiele in Verbindung mit den Zeichnungen näher erläutert. Es zeigen in stark schematisierter Darstellung:

Fig. 1
eine perspektivische, teilweise geschnittene Ansicht einer Sandwichwand nach der Erfindung;
Fig. 2
eine geschnittene Ansicht eines zweiten Ausführungsbeispiels mit einer zwischen zweiter Deckhaut und Innenkern eingefügten Dämpfungsschicht;
Fig. 3
eine Sandwichwand mit einem durch eine Trennwand zwei-geteilten Innenkern gemäß einem dritten Ausführungsbeispiel; und
Fig. 4
eine in eine Tragstruktur einbezogene, einseitig mit einer Dämpfungsfolie belegte Sandwichwand gemäß einem vierten, besonders bevorzugten Ausführungsbeispiel.
The invention will now be explained in more detail using several exemplary embodiments in conjunction with the drawings. They show in a highly schematic representation:
Fig. 1
a perspective, partially sectioned view of a sandwich wall according to the invention;
Fig. 2
a sectional view of a second embodiment with a damping layer inserted between the second cover skin and the inner core;
Fig. 3
a sandwich wall with an inner core divided in two by a partition according to a third embodiment; and
Fig. 4
a sandwich wall included in a support structure and covered on one side with a damping film according to a fourth, particularly preferred exemplary embodiment.

Die in Fig. 1 gezeigte Sandwichwand 2 enthält einen durch aufrecht stehende Hohlkörper 4 gebildeten, spezifisch leichten Innenkern in Form eines Wabenkerns 6 sowie zwei äußere, mit dem Wabenkern 6 verklebte Faserverbund-Deckhäute 8, 10. Die erste, der Haupteinfallsrichtung H des Schalls zugekehrte Deckhaut 8 besteht aus einem offenmaschigen, z.B. im Wege des Wickelverfahrens hergestellten Faserverbundnetz 12 mit je nach der geforderten Lastfestigkeit unterschiedlich orientierten, sich gemäß Fig. 1 unter 90° kreuzenden Fasersträngen 14, wobei die Maschengröße des Faserverbundnetzes 12 wesentlich Kleiner als der Innenquerschnitt der Hohlkörper 6 bemessen ist. Auf der Außenseite ist das Faserverbundnetz 12 mit einer flexiblen, dünnwandigen Deckfolie 16 belegt, wie sie etwa unter der Bezeichnung "Kaptonfolie" im Handel erhältlich ist. Die zweite Deckhaut 10 hingegen besteht aus einer durchgehend geschlossenen Faserverbundschicht.The sandwich wall 2 shown in Fig. 1 contains one by standing upright Hollow body 4 formed, specifically light inner core in the form of a Honeycomb core 6 and two outer fiber composite cover skins glued to the honeycomb core 6 8, 10. The first, the main direction of incidence H of the sound facing cover skin 8 consists of an open-mesh, e.g. in the way of the winding process fiber composite network 12 with depending on the required load strength differently oriented, according to FIG. 1 at 90 ° crossing fiber strands 14, the mesh size of the fiber composite network 12 significantly smaller than the internal cross section of the hollow body 6 is dimensioned. The fiber composite network 12 is on the outside a flexible, thin-walled cover sheet 16, such as under the The designation "Kapton film" is commercially available. The second cover skin 10 on the other hand, consists of a continuous closed fiber composite layer.

Die Deckhäute 8, 10 sind aus einem Glasfaserverbund gefertigt und werden mit dem Wabenkern 6 jeweils über eine Klebefolie 18, 20 verbunden. Beim Verlieben des Faserverbundnetzes 12 wird der Klebstoff über die Netzmaschen abgesaugt, so daß der Klebstoffüberschuß entfernt wird, wodurch das Flächengewicht der fertigen Sandwichwand 2 reduziert, vor allem aber sichergestellt wird, daß die Maschen des Faserverbundnetzes 12 nicht durch Klebstoffreste zugesetzt werden.The cover skins 8, 10 are made of a glass fiber composite and are connected to the honeycomb core 6 in each case via an adhesive film 18, 20. At the Falling in love with the fiber composite network 12 is the adhesive via the net mesh aspirated so that the excess glue is removed, which the Basis weight of the finished sandwich wall 2 reduced, but above all ensured is that the mesh of the fiber composite network 12 is not Adhesive residues are added.

Auf diese Weise wirken die einzelnen Wabenzellen 4 des Wabenkerns 6 gemeinsam mit dem Faserverbundnetz 12 und der auf dieses aufgebrachten Deckfolie 16 jeweils als der Schalleinfallsrichtung H zugekehrte, auf der Rückseite durch die Faserverbundschicht 10 verschlossene Hohlraum-Resonatoren mit einem ausgezeichneten Absorptionsverhalten, welches sich nach Maßgabe der gewählten Hohlraum- und Maschengröße, aber auch in Abhängigkeit von der verwendeten Deckfolie 16 beeinflussen läßt. So läßt sich mit einer geschlossenen Deckfolie 16 ein schmalbandiges Absorptionsverhalten mit einem Absorptionsgrad bis nahezu 100% erreichen, während sich bei Verwendung einer feingelochten oder mikroperforierten Deckfolie 16 eine im Resonanzbereich zwar weniger ausgeprägte, dafür aber erheblich breitbandigere Schallabsorption erzielen läßt.The individual honeycomb cells 4 of the honeycomb core 6 act in this way together with the fiber composite network 12 and the applied to it Cover film 16 each facing the direction of sound H, on the Cavity resonators closed by the fiber composite layer 10 with an excellent absorption behavior, which according to the selected cavity and mesh size, but also in Depending on the cover film 16 used can be influenced. So lets a narrow-band absorption behavior with a closed cover film 16 with an absorption level of almost 100%, while itself when using a finely perforated or microperforated Cover foil 16 is a less pronounced one in the resonance range, but instead but can achieve significantly broadband sound absorption.

Fig. 2, wo die dem ersten Ausführungsbeispiel entsprechenden Bauelemente durch ein um 100 erhöhtes Bezugszeichen gekennzeichnet sind, zeigt eine Sandwichwand 102, bei der im Unterschied zum ersten Ausführungsbeispiel eine aus Schaumstoff bestehende Dämpfungsschicht 22 auf Seiten der geschlossenen Faserverbundschicht 110 in den Innenkern 106 eingefügt ist. Hierdurch wird die Schallschutzwirkung der Sandwichwand 102 im Sinne einer breitbandigen Schallreduktion verbessert. Im übrigen ist die Bau- und Funktionsweise der Sandwichwand 102 die gleiche wie beim ersten Ausführungsbeispiel. Fig. 2, where the components corresponding to the first embodiment are identified by a reference symbol increased by 100, shows a Sandwich wall 102, in contrast to the first embodiment a damping layer 22 made of foam on the side of the closed Fiber composite layer 110 is inserted into the inner core 106. As a result, the soundproofing effect of the sandwich wall 102 becomes apparent broadband noise reduction improved. Otherwise, the construction and Operation of the sandwich wall 102 is the same as in the first embodiment.

Gemäß Fig. 3, wo die dem ersten Ausführungsbeispiel entsprechenden Bauelemente durch ein um 200 erhöhtes Bezugszeichen gekennzeichnet sind, besteht jede der beiden Deckhäute 208, 210 aus einem Faserverbundnetz 212, welches auf der Außenseite mit einer flexiblen Deckfolie 216 belegt ist. Die Sandwichwand 202 ist daher bezüglich eines Schalleinfalls in Richtung beider Deckhäute 208, 210 gleichermaßen schallabsorbierend gestaltet. Zusätzlich ist der Wabenkern 206 durch eine gegenüber den Deckhäuten 208, 210 schräg verlaufende Trennwand 24 zweigeteilt, so daß die Wabenzellen unterschiedliche Hohlraumhöhen autweisen und somit das Absorptionsmaximum der auf diese Weise gebildeten Einzelresonatoren in unterschiedlichen, weitgehend gleichförmig über ein breites Frequenzband verteilten Frequenzbereichen liegt. Im übrigen ist die Bau- und Funktionsweise der Sandwichwand 202 im wesentlichen die gleiche wie bei den vorhergehenden Ausführungsbeispielen.3, where the corresponding to the first embodiment Components identified by a reference number increased by 200 are, each of the two cover skins 208, 210 consists of a fiber composite network 212, which is covered on the outside with a flexible cover film 216 is. The sandwich wall 202 is therefore in terms of sound incidence Direction of both outer skins 208, 210 designed equally sound-absorbing. In addition, the honeycomb core 206 is opposite to the cover skins 208, 210 inclined partition 24 in two parts, so that the Honeycomb cells have different cavity heights and thus the absorption maximum of the individual resonators formed in this way in different, largely uniform over a broad frequency band distributed frequency ranges. Otherwise, the construction and operation sandwich wall 202 is substantially the same as the previous ones Embodiments.

In Fig. 4, wo die einzelnen Bauelemente durch ein um 300 erhöhtes Bezugszeichen gekennzeichnet sind, ist ein besonders bevorzugtes Ausführungsbeispiel dargestellt. Hier ist die Sandwichwand 302 als integraler Bestandteil in eine Tragstruktur 26, etwa einer Hubschrauberzelle, eingebunden. Die Sandwichwand 302 besteht wiederum aus einem inneren Wabenkern 306 und zwei äußeren, jeweils durch ein Faserverbundnetz 312 und eine Deckfolie 316 gebildeten Deckhäuten 308, 310 und ist Hinblick auf die einwirkenden Lasten als hochsteife und -feste Leichtbauplatte ausgebildet. Die lastfeste Anbindung der Sandwichwand 302 an die Tragstruktur 26 erfolgt mittels randseitiger Faserverbund-Doppler 28. Die Einbaulage der Sandwichwand 302 ist so gewählt, daß die obere Deckhaut 308 den die Hauptschallquellen bildenden Hubschrauberaggregaten, also etwa dem Hauptgetriebe, zugekehrt ist. Die untere, dem Kabineninneren zugewandte Deckhaut 310 ist zusätzlich mit einer auf die Deckfolie 316 aufgebrachten Schalldämpfungsfolie 30 belegt, um den Schallschutz für die Hubschrauberinsassen weiter zu verbessern. Im übrigen ist die Bau- und Funktionsweise der Sandwichwand 302 wiederum die gleiche wie bei den vorhergehend beschriebenen Ausführungsbeispielen.In Fig. 4, where the individual components by a reference numeral increased by 300 are a particularly preferred embodiment shown. Here the sandwich wall 302 is an integral part integrated in a support structure 26, for example a helicopter cell. The sandwich wall 302 again consists of an inner honeycomb core 306 and two outer, each by a fiber composite network 312 and a cover sheet 316 formed cover skins 308, 310 and is in view of the loads acting as a highly rigid and strong lightweight board. The load-resistant connection of the sandwich wall 302 to the support structure 26 takes place by means of fiber composite Doppler 28. The installation position of the Sandwich wall 302 is chosen so that the top cover 308 the Main sound sources forming helicopter units, that is about Main gearbox is turned. The lower one, facing the cabin interior Cover skin 310 is additionally applied to cover film 316 Soundproofing film 30 coated to the soundproofing for the helicopter occupants continue to improve. Otherwise, the construction and operation sandwich wall 302 is again the same as that described above Embodiments.

Claims (13)

Sandwichwand, insbesondere für eine Hubschrauberzelle, bestehend aus einer oberen und einer unteren Deckhaut aus Faserverbundwerkstoff und einem zwischen diesen angeordneten, durch aufrecht stehende Hohlkörper gebildeten Innen-, insbesondere Wabenkern,
dadurch gekennzeichnet, daß
zum Zwecke der Schallabsorption der Sandwichwand (2; 102; 202; 302) zumindest die der Hauptschallquelle (H) zugewandte Deckhaut (8; 108; 208; 308) aus einem offenmaschigen, mit einer flexiblen Deckfolie (16; 116; 216; 316) belegten Faserverbundnetz (12; 112; 212; 312) mit einer Kleineren Maschengröße als der Hohlkörper-Innenquerschnitt besteht.Sandwich wall, in particular for a helicopter cell, consisting of an upper and a lower cover skin made of fiber composite material and an inner core, in particular a honeycomb core, arranged between them and formed by upright hollow bodies,
characterized in that
for the purpose of sound absorption of the sandwich wall (2; 102; 202; 302) at least the cover skin (8; 108; 208; 308) facing the main sound source (H) made of an open-mesh cover sheet with a flexible cover film (16; 116; 216; 316) occupied fiber composite network (12; 112; 212; 312) with a smaller mesh size than the hollow body internal cross section. Sandwichwand nach Anspruch 1,
dadurch gekennzeichnet, daß
für ein schmalbandiges Absorptionsverhalten der Sandwichwand (2; 102; 202; 302) mit hohem Absorptionsgrad eine die Faserverbundnetzmaschen vollständig verschließende Deckfolie (16; 116; 216; 316) vorgesehen ist. Sandwich wall according to claim 1,
characterized in that
For a narrow-band absorption behavior of the sandwich wall (2; 102; 202; 302) with a high degree of absorption, a cover film (16; 116; 216; 316) which completely closes the fiber composite mesh mesh is provided. Sandwichwand nach Anspruch 1,
dadurch gekennzeichnet, daß
die Deckfolie (16; 116; 216; 316) für ein breitbandiges Absorptionsverhalten der Sandwichwand (2; 102; 202; 302) perforiert oder porös ausgebildet ist.Sandwich wall according to claim 1,
characterized in that
the cover film (16; 116; 216; 316) is perforated or porous for a broadband absorption behavior of the sandwich wall (2; 102; 202; 302). Sandwichwand nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß
die Hohlkörper (204) unterschiedliche Hohlraumhöhen besitzen.Sandwich wall according to one of the preceding claims,
characterized in that
the hollow bodies (204) have different cavity heights. Sandwichwand nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß
beide Deckhäute (208, 210; 308, 310) aus einem offenmaschigen, mit einer flexiblen Deckfolie (216; 316) belegten Faserverbundnetz (212; 312) bestehen.Sandwich wall according to one of the preceding claims,
characterized in that
Both cover skins (208, 210; 308, 310) consist of an open-mesh fiber composite network (212; 312) covered with a flexible cover film (216; 316). Sandwichwand nach Anspruch 5,
dadurch gekennzeichnet, daß
der Innenkern (206) durch eine in Richtung der Flächenerstreckung der Deckhäute (208, 210) zwischen diesen verlaufende, geschlossene Trennwand (24) zweiteilig ausgebildet ist. Sandwich wall according to claim 5,
characterized in that
the inner core (206) is formed in two parts by a closed partition wall (24) running between them in the direction of the surface extension of the cover skins (208, 210). Sandwichwand nach Anspruch 6,
dadurch gekennzeichnet, daß
die Trennwand (24) bezüglich der Deckhäute (208, 210) schräg verläuft.Sandwich wall according to claim 6,
characterized in that
the partition (24) extends obliquely with respect to the cover skins (208, 210). Sandwichwand nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, daß
die zweite Deckhaut (10; 110) als geschlossene Faserverbundschicht ausgebildet ist.Sandwich wall according to one of claims 1 to 4,
characterized in that
the second cover skin (10; 110) is designed as a closed fiber composite layer. Sandwichwand nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß
auf der der Hauptschallquelle (H) abgewandten Sandwichseite eine Schalldämpfungsschicht (22; 30) angeordnet ist.Sandwich wall according to one of the preceding claims,
characterized in that
A soundproofing layer (22; 30) is arranged on the sandwich side facing away from the main sound source (H). Sandwichwand nach den Ansprüchen 8 und 9,
dadurch gekennzeichnet, daß
die Schalldämpfungsschicht (22) aus einer zwischen FaserverbundDeckschicht (110) und Innenkern (106) eingefügten Schaumstoffschicht besteht.Sandwich wall according to claims 8 and 9,
characterized in that
the soundproofing layer (22) consists of a foam layer inserted between the fiber composite cover layer (110) and the inner core (106). Sandwichwand nach Anspruch 8 in Verbindung mit Anspruch 5,
dadurch gekennzeichnet, daß
die Schalldämpfungsschicht (30) aus einer auf die der Hauptschallquelle abgewandte Faserverbundnetzhaut (310) aufgebrachten Dämpfungsfolie besteht. Sandwich wall according to claim 8 in conjunction with claim 5,
characterized in that
the soundproofing layer (30) consists of a damping film applied to the fiber composite retina (310) facing away from the main sound source. Sandwichwand nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß
die Sandwichwand (302) als integraler Bestandteil in eine Hubschrauber-Tragstruktur (26) einbezogen ist.Sandwich wall according to one of the preceding claims,
characterized in that
the sandwich wall (302) is incorporated as an integral part in a helicopter support structure (26). Sandwichwand nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß
als Faserverbundwerkstoff ein Glasfaserverbund vorgesehen ist.Sandwich wall according to one of the preceding claims,
characterized in that
a glass fiber composite is provided as the fiber composite material.
EP99102139A 1998-02-06 1999-02-03 Sandwich-type wall Ceased EP0935235A3 (en)

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Application Number Priority Date Filing Date Title
DE19804718 1998-02-06
DE19804718A DE19804718C2 (en) 1998-02-06 1998-02-06 Sound absorbing sandwich wall

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EP0935235A3 EP0935235A3 (en) 2001-11-14

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WO2007137607A1 (en) * 2006-05-30 2007-12-06 Airbus Deutschland Gmbh Sandwich element for sound-absorbing inner cladding of transport means, especially for sound-absorbing inner cladding of aircraft fuselage cells
EP2408665A2 (en) * 2009-03-17 2012-01-25 Airbus Operations GmbH Fuselage cell structure for an aircraft in hybrid design
EP2610052A1 (en) * 2011-12-30 2013-07-03 AGUSTAWESTLAND S.p.A. Aircraft interior trim panel, and aircraft fitted with such panels
WO2013098665A1 (en) * 2011-12-30 2013-07-04 Agustawestland S.P.A. Aircraft interior trim panel, and aircraft fitted with such panels
CN104185546A (en) * 2011-12-30 2014-12-03 奥格斯塔韦斯兰股份公司 Aircraft interior trim panel, and aircraft fitted with such panels
CN104185546B (en) * 2011-12-30 2016-03-16 奥格斯塔韦斯兰股份公司 Interior of aircraft decorative panel and be equipped with the aircraft of this plate
RU2607210C2 (en) * 2011-12-30 2017-01-10 Агустауэстлэнд С.П.А. Aircraft interior finishing panel and aircraft with such panels
US9604714B2 (en) 2011-12-30 2017-03-28 Agustawestland S.P.A. Aircraft interior trim panel, and aircraft fitted with such panels
CN104755004A (en) * 2012-06-13 2015-07-01 日东欧洲股份有限公司 Honeycomb-based higt temperature structural damper
RU2723876C2 (en) * 2018-12-06 2020-06-17 Сергей Юрьевич Алышев Multilayer composite material
CN113488018A (en) * 2021-06-07 2021-10-08 哈尔滨工程大学 Bendable and foldable hollow glass bead interlayer type flexible sound reflection structure and application
CN113488018B (en) * 2021-06-07 2022-08-09 哈尔滨工程大学 Bendable and foldable hollow glass bead interlayer type flexible sound reflection structure and application

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EP0935235A3 (en) 2001-11-14
DE19804718A1 (en) 1999-08-19
DE19804718C2 (en) 2001-09-13
US6179086B1 (en) 2001-01-30

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