FLUTTER DAMPENING ACOUSTIC LINER FOR A TURBOFAN ENGINE

Disclosed is a flutter damper (102), including an acoustic liner (101) having a perforated radial inner face sheet (108) and a radial outer back sheet (110), the acoustic liner being configured for peak acoustical energy absorption at a frequency range that is greater than a frequency range associat...

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Bibliographische Detailangaben
Hauptverfasser:	SADEGHI, Mani, MORIN, Bruce L, MARCHAJ, Ian T, GYSLING, Daniel L
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACOUSTICS ACOUSTICS NOT OTHERWISE PROVIDED FOR AIR INTAKES FOR JET-PROPULSION PLANTS BLASTING COMBUSTION ENGINES CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS GAS-TURBINE PLANTS HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS JET-PROPULSION PLANTS LIGHTING MECHANICAL ENGINEERING METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL MUSICAL INSTRUMENTS PHYSICS SOUND-PRODUCING DEVICES WEAPONS
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Beschreibung
Zusammenfassung:	Disclosed is a flutter damper (102), including an acoustic liner (101) having a perforated radial inner face sheet (108) and a radial outer back sheet (110), the acoustic liner being configured for peak acoustical energy absorption at a frequency range that is greater than a frequency range associated with fan flutter, a chamber (118) secured to the radial outer back sheet, the chamber being in fluid communication with the acoustic liner, and the chamber being configured for peak acoustical energy absorption at a frequency range that is associated with one or more fan flutter modes, and at least one stiffening structure (132, 134) connected to a top surface of the chamber that tunes the top surface out of the frequency range associated with one or more fan flutter modes.