Extended arm bifilar and method to eliminate second order vibrat

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

1976-12-27

1978-04-11

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

With weight-balancing means

Self-shifting or selectively adjustable mass

416500, B64C 2732

Patent

active

040836541

ABSTRACT:
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.degree. 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.degree. while maintaining the original force output. Bifilar motion in the linear range with associated elimination of overtuning produces improved bifilar operation at all flight speeds and eliminates second order vibration due to dissimilar motions resulting from overtuning.

REFERENCES:
patent: 3488998 (1970-01-01), Bonsor
patent: 3540809 (1970-11-01), Paul et al.
patent: 3988073 (1976-10-01), Eastman et al.
patent: 3988074 (1974-10-01), Kenigsberg et al.

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