Communications – electrical: acoustic wave systems and devices – Sonar counter-measures
Patent
1993-12-17
1995-02-28
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Sonar counter-measures
367901, 381 71, G10K 1116
Patent
active
053943767
ABSTRACT:
An apparatus for reducing acoustic radiation from an enclosure containing a fluid includes one or more vibration sensors in communication with surfaces of the enclosure. The vibration sensors feed signals corresponding to detected vibrations in the surface to a radiation filter. The radiation filter assigns weights to the signals and generates a summation signal which is then input to a control unit, with the summation signal ideally representing only those vibrations that will actually radiate from the enclosure. The control unit uses a reference signal and the summation signal to calculate a cancellation waveform to offset the cause of the detected vibrations. The cancellation signal is input to a fluid displacement unit which applies pressure oscillations to the fluid corresponding to the cancellation waveform.
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patent: 4700803 (1987-10-01), Mallet et al.
patent: 5206911 (1993-04-01), Eriksson et al.
W. Webbon, et al., "Active Vibration Control Using Magnetostrictive Intra-Structural Actuators," Second Conference on Recent Advances in Active Control of Sound and Vibration (1993).
J. Thi, et al., "Comparison of Design Approaches in Sound Radiation Suppression," 534-551 (1991).
Samuel E. Craig and O. L. Angevine, "Active Control of Hum from Large Power Transformers--The Real World," Second Conference on Recent Advances in Active Control of Sound and Vibration (1993).
C. F. Ross, "Experiments on the Active Control of Transformer Noise," Journal of Sound and Vibration 473-480 (1978).
Kurtz Paul H.
Riddle Laurence R.
Sewell John M.
Chin Gay
Martin Marietta Corporation
Meise William H.
Pihulic Daniel T.
Winchell Bruce M.
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