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US 5,498,127 AGranted
Active acoustic liner
AssigneeGeneral Electric Company
InventorsRobert E. Kraft, Karen B. Kontos
Life of this patent
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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.
Claims10
An active liner for attenuating noise comprising:
- a rigid backplate;
- a piezoelectric panel having a back surface fixedly joined to said backplate, and an opposite face surface for directly facing said noise;
- a pressure transducer disposed in said panel for sensing acoustic pressure of said noise being propagated against said panel face surface;
- means for electrically driving said panel to effect piezoelectric displacement thereof in a direction normal to said panel face surface;
- and
- means operatively joined to said pressure transducer and said driving means for controlling displacement of said panel face surface, said controlling means including a predetermined schedule of acoustic impedance for controlling said driving means to effect a velocity of said panel face surface for said acoustic pressure for obtaining said predetermined acoustic impedance to attenuate said noise.
3 more elements
Dependencies are inferred from the claim text.