초록 ▼

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 pr

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.

대표청구항 ▼

[ We claim:] [1.] An active control system for reducing blade-vortex-interaction (BVI) noise generated by a rotor blade, the rotor blade including an interior, a tip end, a root end, and an aerodynamic surface comprising a leading edge, a trailing edge, an upper surface, and a lower surface, the act

[ We claim:] [1.] An active control system for reducing blade-vortex-interaction (BVI) noise generated by a rotor blade, the rotor blade including an interior, a tip end, a root end, and an aerodynamic surface comprising a leading edge, a trailing edge, an upper surface, and a lower surface, the active control system comprising:a sensor assembly in close proximity to the rotor blade, the sensor assembly being adapted to detect a change in air pressure on the aerodynamic surface of the rotor blade near the leading edge of the rotor blade, the change in air pressure having a magnitude;a device for changing a lift generated by the rotor blade, the device being adapted to be activated to thereby change the lift of the rotor blade while the rotor blade is maintained at a constant rotational velocity, the device for changing a lift generated by the rotor blade comprising at least one aperture on the rotor blade and a diaphragm in the interior of the rotor blade, the diaphragm being adapted to be activated and moved between a first position and a second position at a frequency, whereby 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; anda controller for activating the device upon the detected change in air pressure by the sensor assembly, the controller activating the device to change the lift of the rotor blade in order to introduce a compensating pressure onto the aerodynamic surface of the rotor blade, the compensating pressure being adapted to attenuate the magnitude of the change of air pressure.