Aeronautics and astronautics – Aircraft – heavier-than-air – Helicopter or auto-rotating wing sustained – i.e. – gyroplanes
Patent
1975-01-02
1976-05-04
Blix, Trygve M.
Aeronautics and astronautics
Aircraft, heavier-than-air
Helicopter or auto-rotating wing sustained, i.e., gyroplanes
73455, 73462, 244 1727, 416500, B64C 2770
Patent
active
039542297
ABSTRACT:
Vibration in the helicopter fuselage produced through the helicopter rotor at a frequency of one for each rotation of the rotor (commonly identified in the art as a one-per-rev vibration) is controlled by applying a correction signal to the primary cyclic control system of the rotor assembly. To generate the correction signal, a transducer responds to the one-per-rev vibrations to generate a signal coupled to circuitry for generating a vibration related signal dependent upon the amplitude and phase of the one-per-rev vibrations. The vibration related signal is applied to a sample and store network wherein it is demodulated by a reference signal related to the rotational speed of the helicopter to establish a control voltage which varies at a rate in dependence upon variation in the maximum amplitude of the one-per-rev vibrations. This control voltage is integrated and modulated by the reference signal thereby resulting in the correction signal for application to the primary cyclic control system. The reference signal for both the demodulation and modulation steps is generated by combining a reference pulse having a phase corresponding to a desired cyclic pitch generated for each revolution of the helicopter with a pulse train synchronized with the reference pulse at a repetition rate related to rotation of the helicopter rotor. In one embodiment of the invention a manually adjustable ride control voltage is generated that has a magnitude related to a desired vibration correction. This ride control voltage is switched alternately with the control voltage to be modulated by the reference signal.
REFERENCES:
patent: 2891741 (1959-06-01), Ellis et al.
patent: 3617020 (1971-11-01), Gerstine et al.
patent: 3635427 (1972-01-01), Balke
patent: 3795375 (1974-03-01), Lemnios
Blix Trygve M.
Kunin Stephen G.
Textron Inc.
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