Preventing augmenting vertical load induced oscillations in a he

Details Preventing augmenting vertical load induced oscillations in a he Preventing augmenting vertical load induced oscillations in a he

1987-06-26

1988-05-03

Peters, Jr., Joseph F.

Aeronautics and astronautics

Aircraft, heavier-than-air

Helicopter or auto-rotating wing sustained, i.e., gyroplanes

B64C 2757

Patent

active

047415010

ABSTRACT:
Collective stick inputs are provided (18) to a high pass filter (24) when collective stick reversals in excess of a threshold collective authority rate (15%/sec) and in excess of a threshold frequency (3 stick reversals per second) are sensed. The output of the high pass filter (24) is scaled (26) and subtracted (14) from the collective inputs so as to effectively cancel the threshold stick reversals. Otherwise, if no stick reversals in excess of the threshold collective authority rate are sensed for a threshold time interval (5 seconds), the collective stick inputs are not provided to the high pass filter.

REFERENCES:
patent: 3756543 (1973-09-01), Fowler et al.
patent: 3833189 (1974-09-01), Fowler et al.
patent: 4279391 (1981-07-01), Adams et al.

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