Higher harmonic control apparatus for a helicopter rotor

Details Higher harmonic control apparatus for a helicopter rotor Higher harmonic control apparatus for a helicopter rotor

1996-02-21

1997-08-12

Verdier, Christopher

Fluid reaction surfaces (i.e., impellers)

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

416 61, 416114, 416500, 92 26, 92 27, B64C 1140, B64C 2764

Patent

active

056558783

ABSTRACT:
A control system has an HHC actuator having a basal portion and a movable portion. A load acting on the control system is detected by a semiconductor gauge. The load detected by the semiconductor gauge is compared with a threshold value in a computer. If the detected load is larger than the threshold load, the movable portion is fixed to the basal portion by a fixing mechanism. By detecting the sign of stall of blades, the HHC actuator is fixed in a neutral position, allowing safe flight. A fixing switch is provided for allowing the fixing mechanism to operate regardless of the result of the comparison with the computer.

REFERENCES:
patent: 3744928 (1973-07-01), Hansen et al.
patent: 3960348 (1976-06-01), Fowler et al.
Letter from European Associate and Copy of European Search Report dated Jun. 21, 1996.
Lehman, G. and Kube, R. Automatic Vibration Reduction at a Four Bladed Hingeless Model Rotor--A Wind Tunnel Demonstration, Vertica, vol. 14, No. 1 (1990), pp. 69-86.
Achache, M. and Polychroniadis, M. Development of an Experimental System for Active Control of Vibrations on Helicopters--Development Methodology for an Airborne System, Vertica, vol. 11, No. 1/2 (1987), pp. 123-136.

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