CPC B64D 33/02 (2013.01) [G10K 11/168 (2013.01); G10K 11/172 (2013.01); B64D 2033/0206 (2013.01)] | 15 Claims |
1. An acoustic panel for an aircraft nacelle, comprising, from a central axis of the nacelle toward an exterior of the nacelle:
a resistive skin that forms a visible face of an interior duct of the nacelle, wherein the resistive skin is microperforated to have sound absorbing holes;
a core adapted to damp sound waves, the core comprising a first damping stage and a second damping stage which are separated from each other by a septum, wherein the septum is a planar wall that is formed with communication holes that extend between the first and second damping stages; and
a back skin configured to provide mechanical strength for the acoustic panel;
wherein a thickness of the septum is greater than a thickness of the resistive skin.
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