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Device for reducing the vibrations generated by a lift rotor of a rotary-wing aircraft

  • US 6,045,090 A
  • Filed: 06/12/1997
  • Issued: 04/04/2000
  • Est. Priority Date: 06/12/1996
  • Status: Expired due to Term
First Claim
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1. 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; and

    drive means for bringing said adjustment oscillating mass into said adjustment position and for keeping it in this adjustment position.

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