Balancing a ram air turbine

Details Balancing a ram air turbine Balancing a ram air turbine

2009-04-20

2011-11-29

Chaudhari, Chandra (Department: 2891)

Fluid reaction surfaces (i.e., impellers)

With control means responsive to non-cyclic condition...

Impeller rotation speed responsive

C416S15700A

Reexamination Certificate

active

08066481

ABSTRACT:
A method of balancing a ram air turbine that has a turbine shaft with a turbine shaft axis, a rotor attached to the shaft, rotor blades attached to the rotor that move between a fine pitch and coarse pitch position, a spring-loaded governor for controlling the position of the blades that has its springing retained by a stationary outer spring seat and a movable inner yoke plate that slides on the turbine shaft and whose position determines blade pitch, comprises the steps of: pulling the yoke plate toward the spring seat to displace the yoke plate toward the spring seat sufficiently to cause the rotor blades to assume a desired degree of pitch; spinning the turbine shaft at a desired rotational speed; balancing the rotor to minimize vibration of the rotor with the desired rotor blade pitch and turbine shaft speed; and releasing the pull of the yoke plate toward the spring seat.

REFERENCES:
patent: 2583369 (1952-01-01), Fumagalli
patent: 2955656 (1960-10-01), Balje et al.
patent: 3013613 (1961-12-01), Blackburn
patent: 4692093 (1987-09-01), Safarik
patent: 4743163 (1988-05-01), Markunas
patent: 7074010 (2006-07-01), DeGroff et al.

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