US 12,330,768 B2
Acoustic panel
Dave Kirk, Burnley (GB); Graeme Hill, Burnley (GB); Dave Hebden, Burnley (GB); and Simon Furmston, Burnley (GB)
Assigned to Safran Nacelles Limited, (GB)
Appl. No. 17/608,819
Filed by Safran Nacelles Limited, Burnley (GB)
PCT Filed May 7, 2020, PCT No. PCT/GB2020/051121
§ 371(c)(1), (2) Date Nov. 4, 2021,
PCT Pub. No. WO2020/225563, PCT Pub. Date Nov. 12, 2020.
Claims priority of application No. 1906537 (GB), filed on May 9, 2019.
Prior Publication US 2022/0297818 A1, Sep. 22, 2022
Int. Cl. B64D 33/02 (2006.01); B64C 1/40 (2006.01); F02C 7/045 (2006.01); F02K 1/82 (2006.01); G10K 11/168 (2006.01)
CPC B64C 1/40 (2013.01) [B64D 33/02 (2013.01); F02C 7/045 (2013.01); F02K 1/827 (2013.01); G10K 11/168 (2013.01); B64D 2033/0206 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A curved acoustic panel for an aircraft comprising:
a sound attenuating sheet comprising two sound attenuating sheet layers, wherein each sound attenuating sheet layer comprises a plurality of cavities and the sound attenuating layers are separated by a septum, the sound attenuating sheet having a first surface, a second surface opposite to the first surface and an end surface connecting the first and second surfaces,
a first sheet portion extending over and abutting both at least a portion of the first surface and at least a portion of the end surface,
a second sheet portion extending over and abutting both at least a portion of the second surface and at least a portion of the end surface, and
a third sheet, separate from the first and second sheet portions, including a stepped portion extending over and directly abutting a portion of the first sheet portion that extends over at least a portion of the first surface of the sound attenuating sheet,
the third sheet portion further including a planar portion extending over and directly abutting the first surface of the sound attenuating sheet, the planar portion of the third sheet being coplanar with the portion of the first sheet portion,
wherein the third sheet portion includes a transition portion extending between the planar portion and the stepped portion, the stepped, planar, and transition portions all being the same thickness,
wherein the first and the second sheet portions form a contiguous sheet such that a tensile force can be transferred between the first and second sheet portions,
wherein the panel is curved, such that the first surface is a radially outer surface and the second surface is a radially inner surface, the end surface having an annular or arcuate shape.