Rotary kinetic fluid motors or pumps – With sound or vibratory wave absorbing or preventing means...
Patent
1996-11-15
1999-07-06
Lopez, F. Daniel
Rotary kinetic fluid motors or pumps
With sound or vibratory wave absorbing or preventing means...
181206, 244 1N, 381 71, F01D 2504
Patent
active
059190299
ABSTRACT:
The present invention is embodied in an aircraft engine noise absorption system having a resonator cavity for absorbing incident noise except for a residue noise signal having a predominant frequency, the system comprising an actuator providing an actuator acoustic signal, a noise sensor for sensing the predominant frequency, and a controller for setting the actuator acoustic signal to the predominant frequency and varying one of a phase and an amplitude of the actuator acoustic signal to decrease the residue noise signal.
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Arcas Noe
Parente Charles A.
Van Nostrand William C.
Anderson Terry J.
Hoch Jr. Karl J.
Lopez F. Daniel
Northrop Grumman Corporation
Woo Richard
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