Fluid reaction surfaces (i.e. – impellers) – With control means responsive to non-cyclic condition... – Plural distinct impellers having related control
Patent
1987-11-19
1990-02-13
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
With control means responsive to non-cyclic condition...
Plural distinct impellers having related control
416 35, B64C 1150
Patent
active
049002260
ABSTRACT:
Control system for synchrophasing the propellers of an aircraft, each propeller provided with a blade pitch controller for controlling the blade angle of the propeller, the systen containing for each propeller a control loop, comprising: a revolution rate controller, means for determining the blade passing frequency, an adjustable propeller revolution rate reference source supplying a revolution rate setpoint control signal, comparator means for comparing the blade passing frequency with said setpoint to generate an error signal for the revolution rate controller. The control system comprises furthermore for each propeller: means for determining the position of the propeller blades, a reference signal source, adjustable means changing the phase reference signal a comparator to compare the sensed position of the propeller blades with said phase reference signal, providing a control signal to be combined with the output signal of the revolution controller, and that the system furthermore comprises means to adjust said propeller revolution rate reference source and said phase reference signal deriving means such that for each revolution rate setpoint a predetermined mutual phase relationship between the propellers are maintained.
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Fokker Aircraft B.V.
Powell Jr. Everette A.
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