Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Particular transducer or enclosure structure
Patent
1996-11-15
1998-10-06
Chang, Vivian
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Particular transducer or enclosure structure
244130, A61F 1106
Patent
active
058189475
ABSTRACT:
A method and system are provided for reducing flow-induced resonance in a structure's cavity. A time-varying disturbance is introduced into the flow along a leading edge of the cavity. The time-varying disturbance can be periodic and can have the same or different frequency of the natural resonant frequency of the cavity. In one embodiment of the system, flaps are mounted flush with the surface of the structure along the cavity's leading edge. A piezoelectric actuator is coupled to each flap and causes a portion of each flap to oscillate into and out of the flow in accordance with the time-varying function. Resonance reduction can be achieved with both open-loop and closed-loop configurations of the system.
REFERENCES:
patent: 5493615 (1996-02-01), Burke et al.
patent: 5606214 (1997-02-01), Corsaro
Cattafesta, III Louis N.
Garg Sanjay
Wlezien Richard W.
Won Chin C.
Chang Vivian
High Technology Corporation
Van Bergen Peter J.
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