Acoustics – Sound-modifying means – Muffler – fluid conducting type
Reexamination Certificate
2011-08-09
2011-08-09
Luks, Jeremy (Department: 2832)
Acoustics
Sound-modifying means
Muffler, fluid conducting type
C415S119000
Reexamination Certificate
active
07992674
ABSTRACT:
A fan system includes a rotor supported for rotation about a fan axis. The rotor has a central hub and a plurality of blades each extending outwardly from the hub to a tip. The rotor blades define a rotor plane perpendicular to the fan axis. A first acoustic resonator has an opening disposed on a first side of the rotor plane and a second acoustic resonator has an opening disposed on a second side of the rotor plane. The acoustic resonators are configured to provide a dipole resonator system operable to at least partially reduce a blade pass frequency tone in an upstream and a downstream direction simultaneously.
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Capone Dean E.
Gorny Lee J.
Koopmann Gary H.
Gifford Krass Sprinkle Anderson & Citkowski P.C.
Luks Jeremy
The Penn State Research Foundation
Wathen Douglas L.
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