公路飞机跑道道面凹形变坡动力分析

Dynamic analysis on concave grade turn point of highway runway pavement used by aircraft

为了分析公路飞机跑道表面凹形变坡对飞机起降产生的影响,应用飞行力学与振动力学原理,建立飞机起落架的运动模型和振动方程,研究动载系数与凹形变坡形状和飞机滑行速度的关系。结果表明:飞机前起落架振动对重心位置的影响较小,后起落架振动对驾驶位置的影响较小;当飞机速度不变时,最大动载系数随变坡增大而增大;当变坡值不变时,振动随速度增加而加强;且在不同速度和坡度的情况下,其重心位置的动载系数只有1.1左右,振动加速度一般在动载系数的±0.3之间。

In order to analyze the impact of concave grade turn point of highway runway pavement on aircraft motion, the vibration equation and model of undercarriage were established by the principles of flight dynamics and vibration mechanics, and the relation between dynamic coeffi- cient and figure of concave grade turn point was analyzed. The results show that： the effect of nose gear vibration on the center of gravity position is little, and the influence of tail gear vibration on driving position is aslo little when aircraft speed keep invariant, the maximum dynamic co- efficient of it will increase with the concave grade turn point increasing;when the concave grade turn point keep invariant, aircraft vibration will increase with the speed increasing;and under different speed and grade turn point, the dynamic coefficient of gravity center is about 1.1, and the vibration acceleration and dynamic coefficient cllange is smaller than ±0.3. 6 figs, 10 refs.