Active noise control using a tunable plate radiator

Details Active noise control using a tunable plate radiator Active noise control using a tunable plate radiator

1994-12-19

1997-04-08

Barefoot, Galen L.

Aeronautics and astronautics

Miscellaneous

181206, 381 71, 381 96, 381171, 415119, G10K 1116

Patent

active

056180101

ABSTRACT:
An active noise control subassembly for reducing noise caused by a source (such as an aircraft engine) independent of the subassembly. A noise radiating panel is bendably vibratable to generate a panel noise canceling at least a portion of the source noise. A piezoceramic actuator plate is connected to the panel. A back plate is spaced apart from the first plate and the panel with the panel positioned between the source noise and the back plate. A pair of spaced-apart side walls each generally abut the panel and the back plate so as to generally enclose a back cavity. A mechanism is provided for varying the panel resonating frequency by varying the state of the back cavity (such as by varying its fluid pressure and/or volume) while the panel is undergoing bending vibrations.

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Concurrently filed U.S. patent application RD-23664, Frederic G. Pla, entitled "Noise Control Using a Plate Radiator and an Acoustic Resonator".
Concurrently filed U.S. patent application RD-23569, Frederic G. Pla, entitled "Active Noise Control Using and Array of Plate Radiators and Acoustic Resonators".
U.S. patent application Ser. No. 08/143,602, filed Nov. 1, 1993, Frederic G. Pla et al., entitled "Active Noise Control Using Noise Source Having Adaptive Resonant Frequency Tuning Through Stiffness Variation".
U.S. patent application Ser. No. 08/143,605, filed Nov. 1, 1993, Frederic G. Pla et al., entitled "Active Noise Control Using Noise Source Having Adaptive Resonant Frequency Tuning Through Stress Variation".
U.S. patent application Ser. No. 08/143,604, filed Nov. 1, 1993, Frederic G. Pla et al., entitled "Active Noise Control Using Noise Source Having Adaptive Resonant Frequency Tuning Through Variable Panel Loading".
U.S. patent application Ser. No. 08/143,603, filed Nov. 1, 1993, Frederic G. Pla et al., entitled "Active Noise Control Using Noise Source Having Adaptive Resonant Frequency Tuning Through Variable Ring Loading".
See "Background of Invention" in present application.
U.S. patent application RD-23528, Frederic G. Pla et al., entitled "Active Noise Control of Aircraft Engine Discrete Tonal Noise" (filing receipt not yet received).

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