초록 ▼

An active control device for use on an aerodynamic structure is provided. The aerodynamic structure includes an outer aerodynamic skin and an interior volume, wherein the outer aerodynamic skin surrounds the interior volume. The active control device includes at least one aperture disposed on the ou

An active control device for use on an aerodynamic structure is provided. The aerodynamic structure includes an outer aerodynamic skin and an interior volume, wherein the outer aerodynamic skin surrounds the interior volume. The active control device includes at least one aperture disposed on the outer aerodynamic skin and a diaphragm disposed in the interior volume of the aerodynamic structure. The at least one aperture connects the outer aerodynamic skin to the interior volume, and the diaphragm in the interior volume is movable between a first position and a second position. Movement of the diaphragm from the first position to the second position pushes air through the at least one aperture and out of the interior volume. Movement of the diaphragm from the second position to the first position draws air through the at least one aperture and into the interior volume. The diaphragm may be circular, or may be oval-shaped.

대표청구항 ▼

[ We claim:] [1.] An active control device for reducing blade-vortex-interaction (BVI) noise generated by a rotorcraft, the active control device being adapted to be installed into a rotor blade of the rotorcraft, the rotor blade having a skin forming an aerodynamic surface of the rotor blade and su

[ We claim:] [1.] An active control device for reducing blade-vortex-interaction (BVI) noise generated by a rotorcraft, the active control device being adapted to be installed into a rotor blade of the rotorcraft, the rotor blade having a skin forming an aerodynamic surface of the rotor blade and surrounding an inner volume within the rotor blade, the active control device comprising:a diaphragm disposed within the inner volume, the diaphragm having an outer periphery and an inner periphery, the outer periphery being adapted to be coupled to the skin of the rotor blade;a rigid piston connected to the inner periphery of the diaphragm;a wall coupled to the rigid piston; anda wire wound around the wall.