Method and apparatus for reducing airframe aerosound

Details Method and apparatus for reducing airframe aerosound Method and apparatus for reducing airframe aerosound

1995-07-10

1998-05-12

Kashnikow, Andres

Aeronautics and astronautics

Aircraft sustentation

Sustaining airfoils

244213, 244199, B64C 350

Patent

active

057495467

ABSTRACT:
A method and apparatus for reducing noise produced by the airframe of an airplane in flight. The present invention provides a smooth, continuous, arcuate surface, such as a rounded edge cap, for the lateral surface of any airplane flap exposed to fluid having relative motion with respect to the airplane. Tests indicate that a rounded flap edge cap made in accordance with the present invention is effective in attenuating noise levels in the middle and high frequency range, i.e., between about 500 to about 10000 Hz.

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S. A McInerny et al., AIAA-86-1918, "An Experimental Investigation of Wing Tip Turbulence with Applications to Aerosound," (AIAA 10th Aeroacoustics Conference) Jul. 9-11, 1986/Seattle, Washington, pp. 1-21.
Miller, Wendell Roger, Flap Noise Characteristics Measured By Pressure Cross-Correlation Techniques, UMI Dissertation Services, Degree Date 1980.

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