Rotary kinetic fluid motors or pumps – With inspection – signaling – indicating or measuring means
Patent
1993-11-01
1995-05-16
Look, Edward K.
Rotary kinetic fluid motors or pumps
With inspection, signaling, indicating or measuring means
415119, 181206, 244 1N, 381 71, F01D 2500
Patent
active
054155223
ABSTRACT:
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.
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Hedeen Robert A.
Pla Frederic G.
Rajiyah Harindra
Renshaw Anthony A.
General Electric Company
Larson James A.
Look Edward K.
Scanlon Patrick R.
Webb II Paul R.
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