导航

ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2004, Vol. 25 ›› Issue (6): 581-584.

• 论文 • Previous Articles     Next Articles

Parametric Analysis of Inter-Blade Lag Dampers of Helicopter Rotor

HU Guo-cai, XIANG Jin-wu   

  1. Institute of Aircraft Design, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:2003-11-17 Revised:2004-04-02 Online:2004-12-25 Published:2004-12-25

Abstract: An analytical model is presented for nonlinear helicopter rotor/fuselage coupled dynamics with inter-blade lag dampers. Along with the damper linear properties, numerical simulation and time-domain technology are applied in predictions of rotor/fuselage coupled dynamic instabilities and damper loads in forward flight. Effects of the damper configurations and structural parameters on the system dynamic instabilities and the damper loads are studied, and significant effects of the damper kinematic couplings are observed. Advantages of kinematic couplings can be utilized by cautiously selecting the damper attachment offset and its build-in angles with rotor hub plane. Compared with a baseline model (which has no damper attachment offset), analytical results show that the regressive lag mode damping can be increased about 50%, simultaneously, the damper steady cyclic load amplitude has about 60% decrement for a notional model.

Key words: helicopter, dynamic stability, inter-blade lag damper, nonlinear dynamics, parametric analysis