Propeller blade position controller

Details Propeller blade position controller Propeller blade position controller

1994-01-18

1996-09-03

Barefoot, Galen L.

Aeronautics and astronautics

Miscellaneous

416 33, 381 71, 364508, 364574, B64D 3112

Patent

active

055516491

ABSTRACT:
System for reducing vibrations in the cabin of an aircraft driven by two or more propellers each having n blades (n being an integer equal or larger than 2) of which the relative phase angle can be adjusted, said system comprising synchrophase means for adjusting said relative phase angle such that a predetermined relative phase angle is maintained. The system furthermore comprises means supplying information about the vibration level at one or more positions within the cabin or thereto related information and for generating a thereto corresponding level signal, and a control unit which in response to said level signal supplies an error signal to the synchrophase means causing the synchrophase means to adjust the blades of the various propellers such that a new relative phase angle is maintained which differs m.(2.pi.
) radians (m being an integer) from the previous relative phase angle. Each propeller comprises at least one recognizing means attached to one of its propeller blades, the recognizing means being detectable by a sensor in order to establish the absolute position of the various propeller blades.

REFERENCES:
patent: 3589832 (1971-06-01), Harris
patent: 3689175 (1972-09-01), Hartzell
patent: 4653981 (1987-03-01), Harner et al.
patent: 5093791 (1992-03-01), Schneider et al.
patent: 5148402 (1992-09-01), Magliozzi et al.
patent: 5221185 (1993-06-01), Pla et al.

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