格栅舵控制巡飞导弹侧向动态特性分析

摘要

The lateral dynamic characteristics of certain cruise missile controlled by grid fin is investigated in this paper. The aerodynamic force of grid fin is analyzed when the fin steers is in flight, and then the aerodynamic force and aerodynamic moment along with movement equations are linearized based on the small disturbance linear theory, the beginning state of the cruise is chosen as the feature point, and then the values of dynamical coefficient are calculated, upon that the lateral disturbance equations are established. The stability and movement characteristic analysis are performed through solving the disturbance equations. By the same method, the transfer functions and the dynamic responses under the fin's step deflection are obtained. The results indicate that the grid fin can provide favorable stability,and the maneuverability of Bank-to-turn is much larger than Skid-to-turn.%对某型采用格栅舵进行控制的巡飞导弹进行了侧向动态特性分析;通过对飞行时格栅舵偏转提供的偏航与倾斜控制力进行研究,采用小扰动线性化理论对气动力、气动力矩与运动方程进行了线性化,选取巡飞初始状态为特征点,计算了该状态下各系数的值,建立了侧向扰动运动方程组;由扰动运动方程组分析了自由扰动运动的稳定性和运动特点,求得以舵偏为输入的各偏量传递函数,得到舵阶跃偏转下的动态响应;结果表明,在该状态下,巡飞导弹具有侧向稳定性,倾斜转弯的机动能力要远远大于侧滑转弯.