Aircraft cavity acoustic resonance suppression system
AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorsStephen F. McGrath, Leonard L. Shaw
Life of this patent
Estimating the term…
Abstract
An aircraft cavity acoustic resonance suppression system is described which comprises a small diameter, substantially cylindrically shaped member disposed substantially parallel to and spaced up to a distance corresponding to about three airflow boundary layer thicknesses from the surface of the aircraft near the leading edge of the cavity and substantially transverse of airflow thereacross, and an actuator operatively connected to the member providing selective adjustment of the spacing between the member and the aircraft surface.
Claims5
An aircraft cavity acoustic resonance suppression system, which comprises:
- (a) a high frequency tone generator comprising a small diameter, substantially cylindrically shaped member disposed substantially parallel to and in spaced relationship with a surface of an aircraft near the leading edge of a cavity defined in said surface of said aircraft;
- (b) said member being sized in length to subtend from about 75 to 100 percent of the length of said leading edge;
- and
- (c) said member being disposed substantially transverse of the direction of airflow across said cavity;
- (d) whereby, in use, said member generates vortices in said airflow across said cavity at frequencies greater than the characteristic resonant frequency of said cavity.
Dependencies are inferred from the claim text.