Active control of aircraft engine noise using vibrational inputs

Details Active control of aircraft engine noise using vibrational inputs Active control of aircraft engine noise using vibrational inputs

1993-04-21

1994-12-06

Barefoot, Galen L.

Aeronautics and astronautics

Miscellaneous

181206, 381 71, G10K 1116, F01D 526

Patent

active

053703405

ABSTRACT:
An active noise control system which minimizes noise output by creating a secondary, cancelling noise field using vibrational inputs. The system includes one or more piezoceramic actuators mounted to the inner surface of the shroud of an aircraft engine. The actuators can be either mounted directly to the shroud or to one or more noise cancelling members which are resiliently mounted the shroud. Transducers are also provided for sensing the noise generated by the engine and producing an error signal corresponding to the level of noise sensed. A controller sends a control signal to the actuators in response to the error signal, thereby causing the actuators to vibrate and generate a noise field which minimizes the total noise emanating from the engine. The piezoceramic actuators can be thin sheets of piezoceramic material or can be in the form of a piezoelectric-driven mechanical lever arrangement.

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