“鱼叉”系留对直升机动力响应的影响

Influence of Harpoon Deck-Lock on Helicopter Dynamic Response

摘要:

建立了“鱼叉”系留的等效刚度模型,用Lagrange方法建立直升机旋翼/机体耦合非线性动力学模型,用数值方法分析了直升机在“鱼叉”系留状态下机体、桨叶的动力响应。从仿真结果可以看出:“鱼叉”系留增加了直升机的机体约束刚度,使不稳定区向高转速移动,远远超出了额定工作转速范围,有利于防止地面共振的发生。

Abstract:

In this paper, an equivalent stiffness model of harpoon deck-lock was presented, and helicopter rotor/fuselage coupled nonlinear dynamics model was presented using Lagrange method. Dynamic response of fuselage and blades was analyzed using time-domain method. The simulation results indicate that harpoon deck-lock raises the critical rotor speed of instabilities. As the critical rotor speed is more above operative rotating speed, it is salutary to avoid ground resonance.