Sound reduction method and system for jet engines

Details Sound reduction method and system for jet engines Sound reduction method and system for jet engines

1997-03-07

1999-10-12

Harvey, Minsun Oh

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Counterwave generation control path

381 718, A61F 1106, H03B 2900

Patent

active

059664525

ABSTRACT:
A method and apparatus for reducing acoustic noise waves in the vicinity of an electrically conductive plasma, such as in the exhaust of a gas turbine engine, having a sensor to detect the noise wave and generate a representative electrical noise signal; a signal analyzer to analyze the noise signal, a wave form generator to generate a phase inverted, electrical interference signal based on the noise signal, an amplifier, a time delay, an error corrector; and an applying means to conduct the electrical interference signal to the plasma causing the plasma to generate a pulsating interference wave to cancel the acoustic noise wave.

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Shirley, Gerald "The Corona Wind Loudspeake" Journal of the Audio Engineering Society, D.M. Tombs, Nature, 176, 923 (1955) pp. 29-37.

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