About 20 results
https://drivepatents.com/patents/1001157 · 20 Jun 2012
An acoustic liner for a gas turbine engine comprises a folded cavity (126) with an opening (128) and a resistive facing sheet covering the opening, characterised in that the folded cavity further comprises a resistive septum (132) that increases attenuatio...
https://drivepatents.com/patents/1009154 · 5 Oct 2011
A method of retrofitting an acoustic treatment into a fluid handling module includes installing openings (40) in the module and mounting a resonator box (44) on the module so that inlets (54) to the resonator necks (56) register with the installed openings...
https://drivepatents.com/patents/1070727 · 18 Jan 2006
Noise control with respect to rotating machinery such as gas turbine engines is important to meet acceptable operational and environmental constraints. Buzz-saw noise in particular is due to differences in blade to blade geometries both as assembled and du...
https://drivepatents.com/patents/1071183 · 4 Jan 2006
A cooled acoustic liner useful in a fluid handling duct includes a resonator chamber (52) with a neck (56), a face sheet (86), and a coolant plenum (80) residing between the face sheet (86) and the chamber (52). Coolant bypasses the resonator chamber (52),...
https://drivepatents.com/patents/1081935 · 1 Dec 2004
An assembly useful in reducing aircraft engine noise such as turbofan engine noise comprises: (a) a core portion comprising at least one entrance end and at least one exit end for the passage of acoustic energy therethrough; (b) a first member having an ex...
https://drivepatents.com/patents/1088435 · 31 Mar 2004
An acoustic-structural LPC splitter assembly which comprises a structural acoustic splitter 11 through which are arranged a plurality of bleed exhaust ports 2, the acoustic splitter 11 having a first and second end, an inner and outer surface, a front join...
https://drivepatents.com/patents/1088916 · 17 Mar 2004
The acoustically resistive layer (24) is constituted by strips which are disposed in the direction of aerodynamic flow and interconnected by splints which ensure strain relief. The splints have small surfaces relative to the surface of the strips to ensure...
https://drivepatents.com/patents/1088914 · 17 Mar 2004
A tubular acoustic attenuation piece (1) comprises at least two shells (2) with a cellular core. External fish plate strips (8) alone secure the shells together and are fixed to the shells by fixing mechanism which are not visible on the side of the intern...
https://drivepatents.com/patents/1101895 · 11 Sep 2002
The acoustically resistant panel is made by winding a strip of an acoustically resistant material (13) onto a mould (M) to give it the required shape, following it with a structural layer, a cellular core and a total reflection layer before withdrawing the...
https://drivepatents.com/patents/1105739 · 27 Mar 2002
The noise produced on a blower by the interaction of moving blades (1) with fixed blades downstream may be reduced by injecting compressed air jets (14) upstream of the moving blades. The compressed air is taken from the primary flow (12) and fed to a ring...