Sandwich panel for sound absorption

Abstract

An aircraft cabin panel for sound absorption, with a core layer that comprises a plurality of cells that extend in an open manner across the thickness of the core layer and that are separated from each other by cell walls, and with a first cover layer that faces away from the sound field, as well as a second cover layer that faces towards the sound field and that comprises a plurality of perforation holes. The second cover layer is multi-layered and apart from a layer with the perforation also comprises a second layer that acts as a flow resistance device. The second layer is arranged on the outside, and visually closes off the perforation, and the outer layer comprises an air-permeable woven fabric.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of the filing date of U.S. Provisional Patent Application No. 61 / 007,947 filed Dec. 17, 2007, the disclosure of which is hereby incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]The present invention relates to a aircraft cabin panel for sound absorption. The invention in particular also relates to a device for sound absorption in an aircraft cabin.[0003]The sound pressure level in a room, for example in an aircraft cabin, among other things depends on the extent of airborne sound absorption in a room. The higher the absorption of the walls or of the objects situated in the room, the lower the sound pressure level and thus the noise load in the room. Sandwich panels are used in rooms in order to improve the acoustic characteristics of the room, in that, for example, in aircraft cabins the sound that is perceived to be disturbing is absorbed by the panels. As the demand for greater comfor...

AI Technical Summary

Benefits of technology

[0020]In a particularly preferred embodiment the cell walls are perforated so that they are acoustically transparent in the direction parallel to the cover layers so as to allow the best possible utilisation of the adjacent hollow honeycomb spaces. This is advantageous in a perforation geometry that comprises a distance between holes, which distance exceeds the opening width of the cells of the core layer. In this arrangement the cell walls are to be designed such that they allow unhindered passage of sound between the cells. As a result of this a larger hollow space volume is available for sound absorption because the individual honeycomb cells communicate with each other by way of the apertures in the cell walls. As a result of enlarging the hollow

Problems solved by technology

However, these composite panels are far too heavy for the use in an aircraft.

The known sound-absorbent sandwich panels with a honeycomb core are associated with a disadvantage in that the achievable absorption in the woven fabric solutions is inadequate with a view to the height and width of the absorption spectrum.

However, the inhomogeneous surface result

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