US 12,485,597 B2
Acoustic attenuation structure and method for manufacturing same
Hugues Laurent Alglave, Moissy-Cramayel (FR); Patrick Dunleavy, Moissy-Cramayel (FR); Nicolas Pierre Lanfant, Moissy-Cramayel (FR); and Cédric Pierre Michel Thomas, Moissy-Cramayel (FR)
Assigned to SAFRAN, Paris (FR)
Appl. No. 17/915,852
Filed by SAFRAN, Paris (FR)
PCT Filed Mar. 30, 2021, PCT No. PCT/FR2021/050555
§ 371(c)(1), (2) Date Sep. 29, 2022,
PCT Pub. No. WO2021/198610, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 2003124 (FR), filed on Mar. 30, 2020.
Prior Publication US 2023/0131268 A1, Apr. 27, 2023
Int. Cl. B29C 45/56 (2006.01); B29L 7/00 (2006.01); G10K 11/162 (2006.01)
CPC B29C 45/561 (2013.01) [G10K 11/162 (2013.01); B29L 2007/002 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method for manufacturing an acoustic attenuation structure comprising a complex acoustic multi-element panel extending along a horizontal direction and a vertical direction and at least one acoustic skin covering one of horizontal faces of the complex acoustic multi-element panel, said complex acoustic multi-element panel comprising a plurality of complex acoustic elements each having a shape gradually narrowing between a base and a tip and a plurality of partitions surrounding each complex acoustic element so as to form a plurality of acoustic cells, said plurality of partitions extending along the vertical direction from the base of the complex acoustic elements, at least the complex acoustic multi-element panel being produced by injection of a filled or unfilled thermoplastic or thermosetting material, wherein the acoustic attenuation structure further comprises a closing skin covering the horizontal face of the complex acoustic multi-element panel opposite the horizontal face covered by the acoustic skin,
the method comprising producing each of the plurality of partitions and the closing skin together as a single part by injection of a filled or unfilled thermoplastic or thermosetting material and wherein the base of each complex acoustic element is in continuous contact with the base of the adjacent complex acoustic elements so as to form a continuous network of edges, an upper edge of the plurality of partitions extends from a lower portion of the bases of the plurality of complex acoustic elements along the vertical direction.