1996
DOI: 10.2514/3.46976
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Time-averaged active controller for turbofan engine fan noise reduction

Abstract: An active control system has been developed and used experimentally on an operational turbofan engine to reduce inlet tonal noise at the fan blade passage frequency. Both single channel and multichannel systems were tested. The control approach used is the feedforward derivative measurement time-averaged adaptive algorithm. This algorithm is capable of adapting to a nonstationary system, requiring no prior knowledge of the system. A reference sensor mounted in the casing of the fan provides the fan blade passi… Show more

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Cited by 6 publications
(1 citation statement)
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“…In several previous duct noise control experiments 19,20,21 , an adaptive feedforward control algorithm was used to minimize acoustic energy in a duct due to an undesirable noise source. In the current application, the same type of control algorithm is used to drive measured wall pressures to a distribution corresponding to a specified hard-wall cut on duct mode at the test frequency.…”
Section: A Control Algorithmmentioning
confidence: 99%
“…In several previous duct noise control experiments 19,20,21 , an adaptive feedforward control algorithm was used to minimize acoustic energy in a duct due to an undesirable noise source. In the current application, the same type of control algorithm is used to drive measured wall pressures to a distribution corresponding to a specified hard-wall cut on duct mode at the test frequency.…”
Section: A Control Algorithmmentioning
confidence: 99%