Aeronautics and astronautics – Aircraft – heavier-than-air – Helicopter or auto-rotating wing sustained – i.e. – gyroplanes
Patent
1996-11-18
1998-12-29
Barefoot, Galen L.
Aeronautics and astronautics
Aircraft, heavier-than-air
Helicopter or auto-rotating wing sustained, i.e., gyroplanes
244 1727, B64C 2757
Patent
active
058531440
ABSTRACT:
A helicopter structure comprises a fuselage supporting or supported by a rotating system parts of the structure being capable of relative motion at an exciting frequency, there being a plurality of actuators connected between the relatively movable parts of the structure, means continuously to oscillate the actuators at a frequency substantially corresponding to the exciting frequency, and a plurality of sensors attached to the rotating system at selected locations on the rotating system, the sensors being adapted to generate signals representative of dynamic changes at the respective selected locations, processing means adapted to process the signals from the sensors and to provide output signals for controlling the phase and magnitude of applied forces generated by the actuators and for varying the phase and magnitude characteristics of the forces so as to compensate for changes in the dynamic characteristic of the rotating system, whereby the overall level of vibration in the fuselage structure is reduced.
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Lehmann G et al: "Automatic Vibration Reduction at a Four Bladed Hingeless Model Rotor--A Wind Tunnel Demonstration 1)" Vertica, vol. 14, No. 1, Jan. 1, 1990, pp. 69-86, XP000099608 * the whole document *.
Barefoot Galen L.
GKn Westland Helicopters Limited
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