EP0935235A3 - Sandwich-type wall - Google Patents

Sandwich-type wall Download PDF

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Publication number
EP0935235A3
EP0935235A3 EP99102139A EP99102139A EP0935235A3 EP 0935235 A3 EP0935235 A3 EP 0935235A3 EP 99102139 A EP99102139 A EP 99102139A EP 99102139 A EP99102139 A EP 99102139A EP 0935235 A3 EP0935235 A3 EP 0935235A3
Authority
EP
European Patent Office
Prior art keywords
fiber composite
sandwich
type wall
cover skin
absorbing
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.)
Ceased
Application number
EP99102139A
Other languages
German (de)
French (fr)
Other versions
EP0935235A2 (en
Inventor
Horst Dr. Bansemir
Walter Gembler
Ottmar Haider
Christian Ritzer
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 Helicopters Deutschland GmbH
Original Assignee
Eurocopter Deutschland GmbH
Priority date (The priority date 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 date listed.)
Filing date
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

Links

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
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects

Abstract

Eine Sandwichwand (2), insbesondere für eine Hubschrauberzelle, bestehend aus einer oberen und einer unteren Deckhaut (8, 10) aus Faserverbundwerkstoff und einem zwischen diesen angeordneten, aus aufrecht stehenden Hohlkörpern (4) bestehenden Innen-, insbesondere Wabenkern (6) ist erfindungsgemäß in gewichtssparender und herstellungsmäßig einfacher Weise dadurch schallabsorbierend ausgebildet, daß die der Hauptschallquelle (H) zugewandte Deckhaut (8) aus einem offenmaschigen, mit einer flexiblen Deckfolie (16) belegten Faserverbundnetz (12) mit einer Kleineren Maschengröße als der Hohlkörper-Innenquerschnitt besteht.

Figure 00000001
A sandwich wall (2), in particular for a helicopter cell, consisting of an upper and a lower cover skin (8, 10) made of fiber composite material and an inner, in particular honeycomb core (6) consisting of upright hollow bodies (4) arranged between them Sound-absorbing in a weight-saving and simple manner in terms of production in that the cover skin (8) facing the main sound source (H) consists of an open-meshed fiber composite network (12) covered with a flexible cover film (16) with a smaller mesh size than the hollow body internal cross-section.
Figure 00000001
EP99102139A 1998-02-06 1999-02-03 Sandwich-type wall Ceased EP0935235A3 (en)

Applications Claiming Priority (2)

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

Publications (2)

Publication Number Publication Date
EP0935235A2 EP0935235A2 (en) 1999-08-11
EP0935235A3 true EP0935235A3 (en) 2001-11-14

Family

ID=7856838

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99102139A Ceased EP0935235A3 (en) 1998-02-06 1999-02-03 Sandwich-type wall

Country Status (3)

Country Link
US (1) US6179086B1 (en)
EP (1) EP0935235A3 (en)
DE (1) DE19804718C2 (en)

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Also Published As

Publication number Publication date
DE19804718C2 (en) 2001-09-13
EP0935235A2 (en) 1999-08-11
US6179086B1 (en) 2001-01-30
DE19804718A1 (en) 1999-08-19

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