NASA NTRS · 20080008192
Rotor control system
Abstract
A helicopter rotor control system (13) including a stop azimuth controller (32) for establishing the value of a deceleration command (15') to a deceleration controller (23), a transition azimuth predictor (41) and a position reference generator (55), which are effective during the last revolution of said rotor (14) to establish a correction indication (38) to adjust the deceleration command (15') to ensure that one of the rotor blades (27) stops at a predetermined angular position.
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Bradford, Michael P., Maciolek, Joseph R.. 1987-07-07. Rotor control system. https://ntrs.nasa.gov/citations/20080008192
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