Acoustics – Sound-modifying means – Sound absorbing panels
Patent
1997-12-02
1999-07-13
Dang, Khanh
Acoustics
Sound-modifying means
Sound absorbing panels
181213, 181214, E04B 182
Patent
active
059230037
ABSTRACT:
An extended reaction acoustic liner for use in jet engine noise mitigation has a substantially non-porous outer layer, a honeycomb core disposed in laminar juxtaposition to the outer layer, and a porous inner layer in laminar juxtaposition to the honeycomb core such that the honeycomb core is sandwiched between the outer layer and the inner layer. The honeycomb core comprises a plurality of cell walls defining a plurality of cells. Some of the cells are in fluid communication with one another via the openings formed in the cell walls. The openings in the cell walls cause viscous acoustic losses, resulting in acoustic energy dissipation and enhanced noise attenuation.
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Arcas Noe
Hutto Frederick M.
Parente Charles A.
Anderson Terry J.
Dang Khanh
Hoch Jr. Karl J.
Northrop Grumman Corporation
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