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

[0007]The present invention is associated with an advantage in that the second layer can assume optical functions so that the panel is of excellent visual surface quality, thus meeting the standards required in aircraft engineering. In addition the layer acts as a flow resistance device, and, if designed properly, additionally improves the absorption characteristics of the panel.

[0021]In a further preferred exemplary embodiment, the cover layers comprise fibre reinforced materials so that the lightest-possible and at the same time stable panels are obtained, wherein the mechanical and optical or visual characteristics of said panels correspond to those of the remaining panels in the cabin lining arrangement.

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 resulting from the perforation is a disadvantage.

This is not acceptable for design reasons because the perforated surface would be visible in an application in the aircraft cabin.

However, it has been shown that the known sandwich panels do not meet the stringent optical requirements that are to be met by lining elements for passenger cabins of means of transport.

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