公开(公告)号：US20210001976A1

公开(公告)日：2021-01-07

申请号：US17026394

申请日：2020-09-21

Applicant: Bell Textron Inc.

Inventor： David E. Heverly, II ,  Jeremy DeWaters ,  Frank B. Stamps

IPC: B64C27/00 ,  B64C29/00

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.

公开(公告)号：US11884385B2

公开(公告)日：2024-01-30

申请号：US17026394

申请日：2020-09-21

Applicant: Bell Textron Inc.

Inventor： David E. Heverly, II ,  Jeremy DeWaters ,  Frank B. Stamps

IPC: B64C27/00 ,  B64C29/00

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.