Rotary kinetic fluid motors or pumps – With sound or vibratory wave absorbing or preventing means...
Patent
1994-11-14
1996-03-12
Look, Edward K.
Rotary kinetic fluid motors or pumps
With sound or vibratory wave absorbing or preventing means...
60725, 181206, 244 1N, 381 71, F01D 2504
Patent
active
054981271
ABSTRACT:
An active liner for attenuating noise includes a rigid backplate supporting a piezoelectric panel. A pressure transducer is disposed in the panel for sensing acoustic pressure of noise being propagated against a face surface of the panel. A controller includes a predetermined schedule of acoustic impedance for controlling a displacement driver joined to the panel to effect a displacement velocity of the panel face surface for obtaining a predetermined acoustic impedance at the sensed acoustic pressure for attenuating noise.
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Kontos Karen B.
Kraft Robert E.
General Electric Company
Hess Andrew C.
Look Edward K.
Scanlon Patrick R.
Verdier Christopher
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