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.

公开(公告)号：US11584519B2

公开(公告)日：2023-02-21

申请号：US16383161

申请日：2019-04-12

Applicant: BELL TEXTRON INC.

Inventor： Michael Reaugh Smith ,  Frank B. Stamps ,  David E. Heverly, II

IPC: B64C27/00 ,  F16F13/26 ,  F16F13/22 ,  F16F15/027 ,  F16F7/10

Abstract: In some examples, an oscillatory pumping system comprises: one or more active piston, a fluid, and two motors. The one or more active piston is disposed in a channel fluidically coupling two fluid chambers. The passive piston has a frequency response operable to counteract a vibratory displacement. The fluid is disposed in the channel and the two fluid chambers. The two motors couple to the one or more active piston. The two motors are operable to selectively change the frequency response of the passive piston based on oscillating the one or more active piston.

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.