Process and apparatus for noise reduction in multi-engine...

Details Process and apparatus for noise reduction in multi-engine... Process and apparatus for noise reduction in multi-engine...

2005-05-24

2005-05-24

Swiatek, Robert P. (Department: 3643)

Aeronautics and astronautics

Miscellaneous

C244S013000, C415S119000, C181S206000

Reexamination Certificate

active

06896219

ABSTRACT:
A process and system for noise reduction in multi-engine propeller-driven aircraft. The parameters of at least two propellers are adjusted with regard to frequency, amplitude, and phase so that the sound fields of the propellers are attenuated or completely extinguished by interference in the area of the closest aircraft fuselage.

REFERENCES:
patent: 4900226 (1990-02-01), de Vries
patent: 5150855 (1992-09-01), Kaptein
patent: 5453943 (1995-09-01), Magliozzi
patent: 5789678 (1998-08-01), Pla

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