Sound reduction method and system for jet engines
AssigneeAmerican Technology Corporation
InventorElwood G. Norris
Life of this patent
Estimating the term…
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.
Claims28
An apparatus for canceling acoustic noise waves in a plasma which is vicinity of plasma which is an electrically conductive, expandable medium, said apparatus comprising:
- circuitry for generating an electrical noise signal representing said acoustic noise waves;
- a controller electrically coupled to said circuitry for generating said electrical noise signal representing said acoustic waves for generating an electrical interference signal based on said electrical noise signal, said electrical interference signal being substantially phase inverted from said electrical noise signal to enable wave cancellation;
- a plasma coupling means electrically coupled to said controller for applying said electrical interference signal to said electrically conductive plasma;
- and
- a sound generating means associated with said electrical interference signal for enabling said electrically conductive plasma to generate a pulsating interference wave, thereby substantially canceling said acoustic noise waves.
An apparatus for canceling acoustic noise waves in a plasma which is vicinity of a plasma which is an electrically conductive, expandible medium, said apparatus comprising:
- a compartment;
- a plasma forming means coupled to the compartment for forming a plasma in said compartment;
- a sensor for detecting said acoustic noise waves, said sensor generating an electrical noise signal representing said acoustic noise waves;
- a controller electrically coupled to said sensor for generating an electrical interference signal based on said electrical noise signal, said electrical interference signal being at least phase inverted from said electrical noise signal;
- and
- a plasma coupling means electrically coupled to said controller for applying said electrical interference signal to said electrically conductive plasma;
- and
- a sound generating means associated with said electrical interference signal for enabling said electrically conductive plasma to generate a pulsating interference wave, thereby substantially canceling said acoustic noise waves.
A method for canceling acoustic waves in a plasma which is a vicinity of a plasma which is an electrically conductive, expandible medium, said method comprising the steps of:
- (a) sensing said acoustic noise waves;
- (b) generating an electrical noise signal representing said acoustic noise waves;
- (c) generating an electrical interference signal based on said electrical noise signal, said electrical interference signal being at least phase inverted from said electrical noise signal;
- (d) applying said electrical interference signal to said electrically conductive plasma;
- and
- (e) generating an interference wave with said electrically conductive plasma, thereby substantially canceling said acoustic noise waves.
Dependencies are inferred from the claim text.