Extended arm bifilar and method to eliminate second order...

Details Extended arm bifilar and method to eliminate second order... Extended arm bifilar and method to eliminate second order...

B - Operations, Transporting

64

C

244/15

B64C 27/04 (2006.01) B64C 27/00 (2006.01)

Patent

CA 1062226

ABSTRACT OF THE DISCLOSURE A helicopter has a plurality of bifilar absorbers mounted on arms radially extended from the hub of the rotor. A bifilar mass of the required weight mounted at the end of an arm of required length to absorb input excitations at a pendulum amplitude of approximately 30° at design forward speed is mounted on an arm twice the length without a reduction in weight of the bifilar mass to limit pendulum amplitude to 15° while maintaining the original force output. Bifilar motion in the linear range with associated elimination of overtuning pro- duces improved bifilar operation at all flight speeds and elimi- nates second order vibration due to dissimilar motions resulting from overtuning.

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