US 11,745,848 B2
Sound waves absorbing laminate composite material structure
Raul Olmo Mora, Madrid (ES); and Tamara Blanco Varela, Madrid (ES)
Assigned to AIRBUS OPERATIONS S.L., Madrid (ES)
Filed by AIRBUS OPERATIONS S.L., Madrid (ES)
Filed on Aug. 21, 2020, as Appl. No. 16/999,198.
Claims priority of application No. 19382719 (EP), filed on Aug. 21, 2019.
Prior Publication US 2021/0053669 A1, Feb. 25, 2021
Int. Cl. B64C 1/40 (2006.01); B29C 70/22 (2006.01); B32B 5/02 (2006.01); G10K 11/168 (2006.01); B29K 307/04 (2006.01); B29K 309/08 (2006.01); B64C 1/00 (2006.01)
CPC B64C 1/40 (2013.01) [B29C 70/228 (2013.01); B32B 5/024 (2013.01); G10K 11/168 (2013.01); B29K 2307/04 (2013.01); B29K 2309/08 (2013.01); B32B 2250/03 (2013.01); B32B 2250/05 (2013.01); B32B 2262/101 (2013.01); B32B 2262/106 (2013.01); B32B 2307/102 (2013.01); B32B 2605/18 (2013.01); B64C 2001/0072 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A sound wave absorbing laminate composite material structure for an aircraft comprising:
at least three plies of a hybrid composite material, wherein each of the at least three plies of the hybrid composite material includes:
a plurality of first polymer material tows arranged parallel to a warp direction, wherein each of the first polymer material tows has a first width W1,
a plurality of second polymer material tows arranged parallel to a weft direction, wherein each of the second polymer material tows has a third width W3,
a plurality of sound absorbent material tows arranged parallel to the warp direction, wherein each of the sound absorbent material tows has a second width W2, wherein the sound absorbent material includes an insulation material comprising tows of an elastomeric material;
the first polymer material tows and the second polymer material tows are tows of carbon fiber reinforcing polymer (CFRP) or glass fiber reinforcing polymer (GFRP); and
the plurality of first polymer material tows, the plurality of second polymer material tows, and the plurality of sound absorbent material tows are intertwined in each of the at least three plies of the hybrid composite material; and
the first width W1, the second width W2 and the third with W3 conform with a formula which is:
λ<(2×W2+W1),
wherein λ is a wavelength of a sound wave.