Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Particular transducer or enclosure structure
Patent
1998-06-10
2000-06-20
Chang, Vivian
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Particular transducer or enclosure structure
244 1N, 244130, A61F 1106
Patent
active
060786744
ABSTRACT:
A method and system are provided for reducing flow-induced resonance in a cavity of a structure. At least one pair of diaphragms are mounted in a housing and separated from one another such that a chamber is formed therebetween within the housing. A first diaphragm of the pair of diaphragms is oscillated in accordance with a time-varying function. A second diaphragm of the pair of diaphragms is oscillated inversely to the first diaphragm so that pressure in the chamber formed therebetween changes in correspondence with the time-varying function. The chamber is vented at a position flush with the surface of the structure along the leading edge of the cavity. As a result of such venting, the pressure in the chamber that changes in correspondence with the time-varying function introduces a corresponding time-varying disturbance into the shear layer along the leading edge of the cavity. The time-varying disturbance reduces the energy that is available in the shear layer that can interact adversely with the cavity to generate resonance.
REFERENCES:
patent: 5699981 (1997-12-01), McGrath et al.
patent: 5818947 (1998-10-01), Cattafesta, III et al.
Cattafesta, III Louis N.
Garg Sanjay
Shukla Deepak
Wlezien Richard W.
Won Chin C.
Chang Vivian
High Technology Corporation
Van Bergen Peter J.
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