| 摘要 |
The application of active noise control to influence the fan-noise components in engine ducts. The fan (25) is used as a source of counter noise by introducing flow distortions upstream 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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