“鱼叉”系留对直升机动力响应的影响

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。

Influence of Harpoon Deck-Lock on Helicopter Dynamic Response

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.