Analytical Model of Elastomeric Lag Damper Kinematic Coupling and Its Effect on Helicopter Air Resonance in Hover

作     者：胡国才 向锦武 张晓谷 Hu Guocai;XIANG Jinwu;ZHANG Xiaogu

作者机构：Institute of Aircraft Design Beijing Univ. of Aero. and Astro. Beijing 100083 China 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：2002年第15卷第1期

页      面：27-32页

核心收录：

学科分类：08[工学] 0825[工学-航空宇航科学与技术] 

主　　题：Airframes Differential equations Helicopter rotors Kinematics Resonance 

摘      要：For an elastomeric lag damper with nonlinear properties and kinematic couplings, its differential equation about equilibrium position was derived in a rotating frame. The equation was then transformed into a non-rotating frame by multi-blade transformation and incorporated into the rotor/airframe differential equations for eigen analysis. The effects of damper steady displacement and kinematic couplings on helicopter air resonance in hover were analyzed. The results demonstrate that the elastomeric damper can increase helicopter dynamic stability; however, its available damping will decrease as its steady displacement increased. For the notional rotor system, the damper steady displacement will decrease when kinematic couplings are introduced, and hence the regressive lag modal damping can be increased.