Rotary kinetic fluid motors or pumps – With inspection – signaling – indicating or measuring means
Patent
1993-11-01
1995-06-13
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
054236584
ABSTRACT:
A noise source for an aircraft engine active noise cancellation system in which the resonant frequency of noise radiating structure is tuned to permit noise cancellation over a wide range of frequencies. The resonant frequency of the noise radiating structure is tuned by a plurality of drivers arranged to contact the noise radiating structure. Excitation of the drivers causes expansion or contraction of the drivers, thereby varying the edge loading applied to the noise radiating structure. The drivers are 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 drivers, causing them to expand or contract. The noise radiating structure may be either the outer shroud of the engine or a ring mounted flush with an inner wall of the shroud or disposed in the interior of the shroud.
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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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