Disclosed is a flutter damper (102, 201), including a chamber (118, 202) having an internal space, a movable diaphragm (218) disposed at least partially within the chamber, the diaphragm separating the chamber into a first chamber (220) and a second chamber (230), the second chamber forming an acoustic volume, wherein a size of the acoustic volume configures the chamber for peak acoustical energy absorption at a frequency range that is associated with one or more fan flutter modes, and a biasing member (222) that moves the diaphragm responsive to a signal from an aircraft or engine electronic control (EEC) (236) unit, wherein movement of the diaphragm increases or reduces the size of the acoustic volume of the second chamber.
VARIABLE DISPLACEMENT FLUTTER DAMPER FOR A TURBOFAN ENGINE
FLATTERDÄMPFER MIT VARIABLER VERDRÄNGUNG FÜR EIN MANTELSTROMTRIEBWERK
AMORTISSEUR DE FLOTTEMENT À DÉPLACEMENT VARIABLE POUR UN MOTEUR DE TURBOSOUFFLANTE
2021-11-17
Patent
Electronic Resource
English
Variable displacement flutter damper for a turbofan engine
European Patent Office | 2020
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