Propeller blade position controller
Adaptive synchrophaser for reducing aircraft cabin noise and vibration
Method for reducing noise and/or vibration from multiple rotating machines Patent #: 5789678
ApplicationNo. 10391181 filed on 03/19/2003
US Classes:244/1N, Noise abatement244/13, Airplane sustained415/119, WITH SOUND OR VIBRATORY WAVE ABSORBING OR PREVENTING MEANS OR ARRANGEMENT181/206By wave interference
ExaminersPrimary: Swiatek, Robert P.
Attorney, Agent or Firm
AbstractA process and system for noise reduction in multi-engine propeller-driven aircraft. The parameters of at least two propellers are adjusted with regard to frequency, amplitude, and phase so that the sound fields of the propellers are attenuated or completely extinguished by interference in the area of the closest aircraft fuselage.