US 12,104,557 B2
Output cone of an aircraft propulsive assembly forming an acoustic treatment system with at least two degrees of freedom
Wolfgang Brochard, Toulouse (FR); Florent Mercat, Toulouse (FR); and Bastian Sabathier, Toulouse (FR)
Assigned to Airbus Operations (S.A.S.), Toulouse (FR)
Filed by Airbus Operations (S.A.S.), Toulouse (FR)
Filed on Dec. 18, 2020, as Appl. No. 17/126,109.
Claims priority of application No. 1915069 (FR), filed on Dec. 20, 2019.
Prior Publication US 2021/0215122 A1, Jul. 15, 2021
Int. Cl. F02K 1/82 (2006.01); F02K 1/04 (2006.01)
CPC F02K 1/827 (2013.01) [F02K 1/04 (2013.01); F05D 2260/963 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An output cone of an aircraft propulsive assembly extending in a general direction called longitudinal direction and comprising a front part and a rear part,
wherein the longitudinal assembly of the front part and rear part forms an acoustic treatment system with at least two degrees of freedom and comprising:
a quarter-wave device formed entirely in the rear part, wherein the quarter-wave device is defined between an outer wall of the cone and a rear skin spaced apart from the outer wall of the cone; and
a device of Helmholtz resonator type defined in an outer annular space between the outer wall of the cone and an inner wall positioned between the outer wall of the cone and a central axis of the cone, wherein the inner wall extends between and is linked to the outer wall of the cone in the front part and to the rear skin of the quarter-wave device such that a portion of at least one cavity of the device of Helmholtz resonator type extends inside the cone under a first portion of the quarter-wave device and a second portion of the quarter-wave device extends rearward beyond the device of Helmholtz resonator type, wherein the device of Helmholtz resonator type is formed partly in the front part and partly in the rear part.