前飞时海豚旋翼桨叶的气动弹性稳定性

本文推导了海豚直升机旋翼桨叶在前飞时的挥摆耦合运动的非线性微分方程组,研究了前飞旋翼的两种不同平衡过程(真实前飞和风洞试验),运用多变量的Floquet-Liapunov理论对带周期系数的线性系统进行了稳定性分析。最后,探讨了桨叶根部的阻尼约束对海豚直升机旋翼桨叶气动弹性稳定性的影响。

Aeroelastic Stability of Dolphin Helicopter Rotor Blade in Forward Flight

The nonlinear differential equations of motion for elastic flap bending and lead-lag bending of Dolphin rotor blade in forward flight are derived in the present paper. Two different trim procedures ( the actual forward flight and the wind tunel test )of the rotor are investigated. By using multivariable Floquet-Liapunov theory, the stability of the linear system with periodic coefficients is analysed. Finally, the effects of constrained damping at the blade root on the aeroelastic stability of Dolphin rotor blade in forward flight are studied.