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AssigneeGeneral Electric Company
InventorsFrederic G. Pla, Harindra Rajiyah, Anthony A. Renshaw, Robert A. Hedeen
Estimating the term…
A noise source for an aircraft engine active noise cancellation system in which the resonant frequency of a noise radiating element is tuned to permit noise cancellation over a wide range of frequencies. The resonant frequency of the noise radiating element is tuned by an expandable ring embedded in the noise radiating element. Excitation of the ring causes expansion or contraction of the ring, thereby varying the stress in the noise radiating element. The ring is actuated by a controller which receives input of a feedback signal proportional to displacement of the noise radiating element and a signal corresponding to the blade passage frequency of the engine's fan. In response, the controller determines a control signal which is sent to the ring, causing the ring to expand or contract. Instead of a single ring embedded in the noise radiating panel, a first expandable ring can be bonded to one side of the noise radiating element, and a second expandable ring can be bonded to the other side.
A noise source for use in an active noise cancellation system which minimizes noise emanating from an aircraft engine having an outer shroud and a fan, said noise source comprising:
An apparatus for minimizing noise emanating from an aircraft engine which has an outer shroud and a fan, said apparatus comprising:
A method for adjusting the resonant frequency of a noise radiating element used in an active noise cancellation system which minimizes noise emanating from an aircraft engine having an outer shroud and a fan, said method comprising the steps of:
Dependencies are inferred from the claim text.