FLUTTER DAMPENING ACOUSTIC LINER FOR A TURBOFAN ENGINE
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United States of America Patent
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Issued Date -
Sep 13, 2018
app pub date -
Mar 7, 2017
filing date -
Mar 7, 2017
priority date (Note) -
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Abstract
Disclosed is a flutter damper, including an acoustic liner having a perforated radial inner face sheet and a radial outer back sheet, 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 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 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.
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