Device for reducing the vibrations generated by a lift rotor of a rotary-wing aircraft
First Claim
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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Accused Products
Abstract
The present invention relates to a device for reducing the vibrations of the rotor of a rotary-wing aircraft, having an oscillating mass (M1), elastically held radially on the hub (4) of the rotor in the vicinity of its axis (X-X) and fixed to an articulated rod (10) substantially longitudinal to said axis (X-X).
According to the invention, said device includes:
an adjustment oscillating mass (M2), mounted so that it can move on the rod (10) and having an adjustment position for which the frequency of the resonator formed by said oscillating masses (M1, M2) is matched to the frequency of said vibrations; and
drive means (18) for bringing the adjustment oscillating mass (M2) into said adjustment position.
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Citations
16 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification