自然风对旋转弹丸外弹道性能影响的仿真研究

Simulation and Study of Effect of Natural Wind on External Trajectory Performance of Spinning Projectile

为研究自然风对旋转弹丸外弹道性能的影响,基于坐标变换理论考虑了地球曲率变化对刚体弹道模型的作用,分析了自然风对各气动力和气动力矩的影响,建立了非标准条件下的刚体外弹道模型。应用该模型对某105mm榴弹不同风速、风向下的外弹道过程进行仿真,结果表明,自然风对飞行弹丸的攻角姿态有较大影响,进而影响弹丸的射程和方向偏移量;自然风对弹丸攻角姿态的影响在弹丸飞行的初始阶段风速大小起主要作用,而在弹丸飞行的中间阶段则是风矢方向起主要作用。

To study the effect of natural wind on external trajectory performance of spinning projectile,effect of earth curvature was analyzed based on the theory of coordinate transformation,the effect of natural wind on aerodynamic force and moment was analyzed.The external trajectory model was established under nonstandard environment.The external trajectory of a 105mm shrapnel at different wind speeds and wind orientation was simulated by use of this model.The calculated results shows that the attack angle of projectile is crucially affected by natural wind which eventually changes the trajectory of projectile.The size of wind speed plays an important role in the effect of natural wind on the dynamical stability at the beginning stage of flying projectile,while at the midway stage the main factor is changed to the direction of wind.