公开(公告)号：US11724800B2

公开(公告)日：2023-08-15

申请号：US17567874

申请日：2022-01-03

Applicant: Textron Innovations Inc.

Inventor： Frank Bradley Stamps ,  David Heverly ,  Michael R. Smith ,  Michael Scott Seifert ,  Thomas C Parham, Jr. ,  Gary Miller ,  Jouyoung Jason Choi ,  Richard E. Rauber

IPC: B64C27/00

CPC classification number: B64C27/001 ,  B64C2027/003 ,  B64C2027/005

Abstract: A vibration attenuator is configured for use on an aircraft rotor rotatable about a mast axis and has upper and lower weight assemblies, each comprising a weight with a center of gravity being a radial distance from the mast axis. The weight assemblies are configured for rotation together relative to the rotor at a selected angular rate about the mast axis, the weights being located on opposing sides of the mast axis. A first motor is configured for selective translation of one of the weight assemblies relative to the other weight assembly along the mast axis between a minimum-moment configuration, in which the centers of gravity of the weights revolve about the mast axis in the same plane, and a maximum-moment configuration, in which the centers of gravity of the weights revolve about the mast axis in different planes for producing a whirling moment about the mast axis.