Noise control using a plate radiator and an acoustic resonator

Details Noise control using a plate radiator and an acoustic resonator Noise control using a plate radiator and an acoustic resonator

1994-12-19

1996-12-17

Kashnikow, Andres

Aeronautics and astronautics

Miscellaneous

244 1R, 244 53R, 310322, 381 71, 381159, B64D 3300

Patent

active

055844472

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 front plate is spaced apart from the panel and the first plate, is positioned generally between the source noise and the panel, and has a sound exit port. A first pair of spaced-apart side walls each generally abut the panel and the front plate so as to generally enclose a front cavity to define a resonator.

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Concurrently filed U.S. patent application RD-23569, Frederic G. Pla, entitled "Active Noise Control Using an Array of Plate Radiators and Acoustic Resonators".
Concurrently filed U.S. patent application RD-23317, Frederic G. Pla et al., entitled "Active Noise Control Using a Tunable Plate Radiator".
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 etal., 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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