Patent ID: 6045090
Filing Date: 2000-04-04
Classification: B64C,F16F,Y10T

Abstract:
A device for reducing the vibrations generated by a lift rotor of a rotary-wing aircraft, said rotor having a shaft which, at least in its upper part comprises a central recess, and said device comprising a main oscillating mass, mounted at an upper part of a hub of said rotor, held radially by elastic means in the vicinity of axis (X-X) of the rotor and fixed to an upper end of a rod which is arranged in said central recess of the shaft of the rotor, substantially longitudinal to the axis (X-X) of said rotor, and which is articulated at its lower end, at a point situated on said axis (X-X) about a directional orthogonal to said axis (X-X), said device further comprises:an adjustment oscillating mass, mounted so that it can move on said rod and for being brought into and kept in an adjustment position for which the natural frequency of a resonator assembly formed by said main oscillating mass and said adjustment oscillating mass is matched to the frequency of said vibrations of the rotor to be reduced; anddrive means for bringing said adjustment oscillating mass into said adjustment position and for keeping it in this adjustment position.