Active vibration control system with non-concentric revolving masses

    公开(公告)号:US11884385B2

    公开(公告)日:2024-01-30

    申请号:US17026394

    申请日:2020-09-21

    CPC classification number: B64C27/001 B64C29/0033 B64C2027/003

    Abstract: A vibration control system for a rotor hub provides vibration attenuation in an aircraft by reducing the magnitude of rotor induced vibratory. The system can include a force generating device attached to a rotor hub which rotates along with the rotor at the rotational speed of the rotor. Vibratory shear force is generated by rotating unbalanced weights each about an axis non-concentric with the rotor hub axis at high speed to create large centrifugal forces. The rotational speed of the weights can be a multiple of the rotor rotational speed to create shear forces for canceling rotor induced vibrations. The amplitude of the generated shear force is controlled by indexing the positions of the unbalanced weights relative to each other, while the phase of the shear force is adjusted by equally phasing each weight relative to the rotor.

    JOURNAL BEARINGS
    3.
    发明公开
    JOURNAL BEARINGS 审中-公开

    公开(公告)号:US20230213059A1

    公开(公告)日:2023-07-06

    申请号:US17568820

    申请日:2022-01-05

    CPC classification number: B64C27/35

    Abstract: A laminated elastomeric journal bearing has an outer sleeve having an inner surface, at least a portion of each end of the inner surface being a concave surface of revolution, and an inner sleeve having an outer surface, at least a portion of each end of the outer surface being a convex surface of revolution. Alternating layers of elastomer and metal are located between the sleeves, with adjacent surfaces of the layers and the sleeves being adhered to each other.

    ACTIVE VIBRATION CONTROL SYSTEM WITH NON-CONCENTRIC REVOLVING MASSES

    公开(公告)号:US20210001976A1

    公开(公告)日:2021-01-07

    申请号:US17026394

    申请日:2020-09-21

    Abstract: A vibration control system for a rotor hub provides vibration attenuation in an aircraft by reducing the magnitude of rotor induced vibratory. The system can include a force generating device attached to a rotor hub which rotates along with the rotor at the rotational speed of the rotor. Vibratory shear force is generated by rotating unbalanced weights each about an axis non-concentric with the rotor hub axis at high speed to create large centrifugal forces. The rotational speed of the weights can be a multiple of the rotor rotational speed to create shear forces for canceling rotor induced vibrations. The amplitude of the generated shear force is controlled by indexing the positions of the unbalanced weights relative to each other, while the phase of the shear force is adjusted by equally phasing each weight relative to the rotor.

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