Fluid reaction surfaces (i.e. – impellers) – With control means responsive to non-cyclic condition... – Pressure or altitude responsive
Patent
1997-06-05
2000-07-25
Verdier, Christopher
Fluid reaction surfaces (i.e., impellers)
With control means responsive to non-cyclic condition...
Pressure or altitude responsive
416 3, 416 90A, 416 91, 416500, 415119, 244199, 244203, 244204, 244130, B64C 2704
Patent
active
060929901
ABSTRACT:
An active control system for reducing blade-vortex-interaction (BVI) noise generated by a rotor blade. The active control system includes a pressure sensor assembly, a device for changing a lift generated by the rotor blade, and a controller for activating the device upon a detected change in air pressure by the sensor assembly. The sensor assembly is disposed in close proximity to the rotor blade, and is adapted to detect a change in air pressure on a surface of the rotor blade near a leading edge of the rotor blade. The device is adapted to be activated by the controller, to thereby change a lift of the rotor blade. The controller activates the device to change a lift of the rotor blade in order to introduce a compensating pressure onto the surface of the rotor blade. This compensating pressure attenuates the magnitude of the change of air pressure. The device for changing a lift generated by the rotor blade can include at least one aperture on the rotor blade and a diaphragm in the interior of the rotor blade. The diaphragm can be activated and moved between a first position and a second position at a frequency. Movement of the diaphragm from the first position to the second position pushes air out of the at least one aperture, and movement of the diaphragm from the second position to the first position draws air into the at least one aperture.
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Domzalski David B.
Hassan Ahmed A.
Straub Friedrich K.
McDonnell Douglas Helicopter Company
Stout Donald E.
Verdier Christopher
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