Acousto-fluidic driver for active control of turbofan engine noise

Publication Date
1997-09-02Filing Date
1995-09-11Inventor
Drzewiecki, Tadeusz M.
Fuller, Christopher R.
Burdisso, Ricardo A.
Thomas, Russell H.
Niemczuk, John B.
Metadata
Show full item recordAbstract
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.
Assignee
Virginia Tech Intellectual Properties, Inc.
Defense Research Technologies, Inc.
Patent Number
5662136
Application Number
8498489
Primary/U.S. Class
137/14
Other/U.S. Class
137/828
CPC Class
G10K11/08
G10K11/1788
G10K2210/121
G10K2210/1281
G10K2210/32121
Y10T137/0396
Y10T137/2196
Patent Type
utility
Collections
- Virginia Tech Patents [689]