US 11,964,752 B2
Acoustically treated landing gear door and method for reducing noise from landing gear of an aircraft
Navid Daneshvaran, Mukilteo, WA (US); Justin H. Lan, Bothell, WA (US); Takao Suzuki, Mill Creek, WA (US); Deric A. Babcock, Saint Charles, MO (US); Jordan R. Kreitzman, Saint Charles, MO (US); and Eric H. Nesbitt, Duvall, WA (US)
Assigned to The Boeing Company, Arlington, VA (US)
Filed by The Boeing Company, Chicago, IL (US)
Filed on Apr. 21, 2022, as Appl. No. 17/726,491.
Claims priority of provisional application 63/193,562, filed on May 26, 2021.
Prior Publication US 2022/0380026 A1, Dec. 1, 2022
Int. Cl. B64C 25/00 (2006.01); B64C 25/16 (2006.01); G10K 11/168 (2006.01); G10K 11/20 (2006.01)
CPC B64C 25/001 (2013.01) [B64C 25/16 (2013.01); G10K 11/168 (2013.01); G10K 11/20 (2013.01); B64C 2025/003 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An acoustically treated landing gear door for reducing noise from a landing gear of an aircraft, the acoustically treated landing gear door comprising:
a landing gear door configured for attachment to the aircraft, the landing gear door comprising an acoustic treatment assembly integrated on an inner mold line of an interior side of the landing gear door, and extending within an interior cavity of the landing gear door, the acoustic treatment assembly comprising:
a core structure comprising:
a first side and a second side;
a plurality of core cells extending between the first side and the second side; and
a drainage system configured to evacuate fluid from the core structure, the drainage system having a plurality of drainage paths coupled to one or more drainage exits, the plurality of drainage paths interconnected between the plurality of core cells, and the one or more drainage exits located at one or more perimeter portions of the landing gear door;
an acoustic facesheet coupled atop the first side of the core structure, the acoustic facesheet allowing fluid communication between an external environment and the plurality of core cells; and
a nonporous backsheet directly coupled between the second side of the core structure and a portion of the interior cavity of the landing gear door,
wherein the landing gear door further comprises a placard printed on a portion of the acoustic facesheet, the placard having an exterior placard surface displaying markings that are legible, while maintaining a controlled porosity, and
wherein when the landing gear of the aircraft is in a deployed position, the acoustically treated landing gear door reduces the noise created by acoustic waves emanating from the landing gear, by absorbing the acoustic waves through the acoustic facesheet and the core structure of the acoustic treatment assembly, and reflecting the acoustic waves off the nonporous backsheet of the acoustic treatment assembly.