公开(公告)号：FR2332176A1

公开(公告)日：1977-06-17

申请号：FR7629522

申请日：1976-10-01

Applicant: UNITED TECHNOLOGIES CORP ,  UNITED TECHNOLOGIES CORP

Inventor： KENIGSBERG IRWIN J ,  PAUL WILLIAM F ,  IRWIN J KENIGSBERG ET WILLIAM F PAUL

IPC: B64C27/00 ,  B64C27/51 ,  B64C27/32 ,  F16F15/14

公开(公告)号：CA1062226A

公开(公告)日：1979-09-11

申请号：CA257611

申请日：1976-07-23

Applicant: UNITED TECHNOLOGIES CORP

Inventor： KENIGSBERG IRWIN J ,  PAUL WILLIAM F

IPC: B64C27/51 ,  B64C27/00 ,  B64C27/04

Abstract: A helicopter has a plurality of bifilar absorbers mounted on arms radially extended from the hub of the rotor. A bifilar mass of the required weight mounted at the end of an arm of required length to absorb input excitations at a pendulum amplitude of approximately 30.degree. at design forward speed is mounted on an arm twice the length without a reduction in weight of the bifilar mass to limit pendulum amplitude to 15.degree. while maintaining the original force output. Bifilar motion in the linear range with associated elimination of overtuning produces improved bifilar operation at all flight speeds and eliminates second order vibration due to dissimilar motions resulting from overtuning.