Power plants – Reaction motor – Method of operation
Patent
1996-05-24
1998-03-31
Thorpe, Timothy
Power plants
Reaction motor
Method of operation
602261, 415119, F02C 724, F02C 7045
Patent
active
057325472
ABSTRACT:
A jet engine fan noise reduction system. The noise reduction system includes active noise control to suppress fan tone noise of an airplane flyover noise signature. The active noise control includes microphones with acoustic transducers upstream and downstream of the engine fan and fan exit guide vane stage to sense control system errors. Control signals are derived from the fan angular speed or blade passing frequency and the error signals sensed by the acoustic transducers. The control output signals actuate (modulate) air control valves on each side of the fan stage to direct conditioned (pressure and temperature regulated) high pressure primary air flow, thereby producing acoustic canceling of fan tone noise.
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Preliminary Experiments on Active Control of Fan Noise From a JT15D Turbofan Engine, Nov. 1991.
Olsen Ronald F.
Orzechowski Jeffrey M.
Gardner Conrad O.
Kim Ted
The Boeing Company
Thorpe Timothy
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