Fluid handling – Processes – Involving pressure control
Patent
1995-09-11
1997-09-02
Chambers, A. Michael
Fluid handling
Processes
Involving pressure control
137828, F15C 104, F15C 112
Patent
active
056621361
ABSTRACT:
Reduction or cancellation of acoustic noise is achieved by providing an amplified, oppositely phased version of the noise by means of an acousto-fluidic amplifier. The amplified acoustic output noise is delivered through an impedance matching horn in destructively interfering relation with the original noise. Depending on the acoustic noise source and its spatial distribution, the acousto-fluidic amplifier may be a single stage amplifier or multiple stages connected in parallel and/or cascade, with output horns spatially distributed to have the maximum cancellation effect. Sensed noise, prior to fluidic amplification, may be processed in a manner to effect feedback or feedforward control of the amplified acoustic output signals.
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Burdisso Ricardo A.
Drzewiecki Tadeusz M.
Fuller Christopher R.
Niemczuk John B.
Thomas Russell H.
Chambers A. Michael
Defense Research Technologies, Inc.
Virginia Tech Intellectual Properties Inc.
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