Sandwich element for the sound-absorbing inner cladding of means of transport, especially for the sound-absorbing inner cladding of aircraft

US20110100747A1Inactive Publication Date: 2011-05-05AIRBUS OPERATIONS GMBH
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
Publication Date
2011-05-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

A sandwich element for sound-absorbing inner cladding of means of transport, especially aircraft, comprising a three-dimensionally constructed core disposed between two substantially parallel cover layers is provided.
Sound transmission passages are incorporated in the core, and/or in at least one cover layer. At least one sound absorption layer is in the area of a cover layer at least in parts. Passages in the cover layers and core provide good sound absorption and heat insulation. The passages allow transmission of sound. The through channels and the preferably inclined installation of the sandwich element allow foreign bodies to be flushed out by, for example, a cleaning liquid or condensation. Possibly sufficient sound absorption can be achieved without the sound absorption layer. Ventilation of the core prevents the long-term presence of condensation, which could cause corrosion and/or rotting. A fire-retardant layer including metal particles may increase fire protection and electromagnetic insulation.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is a continuation-in-part of U.S. patent application Ser. No. 12 / 227,569, filed on Nov. 19, 2008 which is a national stage of PCT / EP2006 / 004944 filed on May 24, 2006, the disclosures of each of which are hereby incorporated herein by reference.BACKGROUND OF THE INVENTION

[0002] The invention relates to a sandwich element for providing a sound-absorbing inner cladding of means of transport, especially for a sound-absorbing inner cladding of aircraft, comprising a three-dimensionally constructed core structure which is disposed between two cover layers which run substantially parallel to one another at a distance.

[0003] Sandwich panels of fibre-reinforced plastic materials are generally used for the inner cladding of aircraft fuselage cells for reasons of saving weight and because of the high strength requirements. The sandwich panels used commonly have a honeycomb-shaped core structure which is provided with cover layers on b...

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DETAILED DESCRIPTION OF THE DRAWINGS

[0037]FIG. 1 shows an isometric diagram of a sandwich element according to the invention. A sandwich element 1 comprises, amongst other things, two cover layers 2, 3 which are applied to both sides of a core structure 4. Applied to the side of the cover layer 3 facing away from the core structure 4 is a sound absorption layer 5 to achieve the desired high sound absorption effect of the sandwich element 1. In addition, the sound absorption layer 5 also enhances the heat insulating capacity of the sandwich element 1 according to the invention.

[0038]FIG. 2 shows an isometric exploded diagram of the sandwich element according to the invention.

[0039]The sandwich element 1 comprises, amongst other things, the core structure 4 with the cover layers 2, 3 applied to both sides. The sound absorption layer 5 is applied to the lower side of the cover layer 3. A plurality of passages 6 are incorporated both in the cover layers 2, 3 and also in the core structu...