Active control of tone noise in engine ducts

Details Active control of tone noise in engine ducts Active control of tone noise in engine ducts

1996-04-30

1997-12-02

Barefoot, Galen I.

Aeronautics and astronautics

Miscellaneous

415119, 101206, 381 71, F01D 2504

Patent

active

056927029

ABSTRACT:
The application of active noise control to influence the fan-noise components in engine ducts. The fan is used as a source of counter noise by introducing flow distortions upstream or downstream of the fan. Microphone arrays sense the noise and produce a control output signal for controlling a distortion producer. The control output signal for the distortion producer comes from a control algorithm utilizing the output of the microphone signals sampled at a defined rate based on the fan blade passing frequency.

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