Methods and apparatus for noise attenuation in an engine nacelle
AssigneeThe Boeing Company
InventorsAlex C. Lumbab, Bradley Scott Leisten
Life of this patent
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Abstract
An acoustic liner includes a first core that has a plurality of first core cells defined by a corresponding plurality of first core cell walls. The first core has a first core thickness. The acoustic liner also includes a second core that has a plurality of second core cells defined by a corresponding plurality of second core cell walls. The second core has a second core thickness, and the first core thickness and the second core thickness are unequal. The acoustic liner further includes a second fabric sheet coupled between the first core and the second core. Each of the plurality of second core cell walls generally is not coplanar with any of the plurality of first core cell walls.
Claims20
An acoustic liner comprising:
- a first core comprising a plurality of first core cells defined by a corresponding plurality of first core cell walls, said first core having a first core thickness;
- a second core comprising a plurality of second core cells defined by a corresponding plurality of second core cell walls, said second core having a second core thickness, wherein said first core thickness and said second core thickness are unequal;
- and
- a second fabric sheet coupled between said first core and said second core, wherein each of said plurality of second core cell walls generally is not coplanar with any of said plurality of first core cell walls.
A nacelle for an engine, said nacelle comprising:
- an acoustic liner comprising:
- a first core comprising a plurality of first core cells defined by a corresponding plurality of first core cell walls, said first core having a first core thickness;
- a second core comprising a plurality of second core cells defined by a corresponding plurality of second core cell walls, said second core having a second core thickness;
- and
- a second fabric sheet coupled between said first core and said second core;
- and
- a structural inner barrel coupled to said nacelle, said structural inner barrel comprising a third core comprising a plurality of third core cells defined by a corresponding plurality of third core cell walls, wherein said acoustic liner is coupled to said structural inner barrel.
A method of making a nacelle, said method comprising:
- disposing a second fabric sheet generally concentrically about a first core, wherein the first core comprises a plurality of first core cells defined by a corresponding plurality of first core cell walls, the first core having a first core thickness;
- disposing a second core generally concentrically about the second fabric sheet, wherein the second core comprises a plurality of second core cells defined by a corresponding plurality of second core cell walls, the second core having a second core thickness
- coupling the second fabric sheet between the first core and the second core;
- and
- coupling the second core to a structural inner barrel.
Dependencies are inferred from the claim text.