科氏惯性力对转管自动机终点偏差的影响

Influence of Coriolis Inertia Force on End Point Deviation of Rotary Tube Automatic Machine

转管自动机的科氏惯性力对弹丸终点偏差的影响会降低射击精度和密集度。利用有限元软件对自动机的固有模态进行分析,获取有关参数并根据空间解析几何知识计算身管振动偏角,依据此偏角及科氏定理得到了某转管自动机的科氏惯性力;结合外弹道理论,建立了科氏惯性力对弹丸章动影响的数学模型;研究结果表明:弹丸飞行马赫数影响章动周期的最小弹丸截止转速,马赫数越大,截止转速越高;弹丸弹带部分即将飞出炮口时,科氏惯性力达到最大;起始章动角影响弹丸章动某一方向的外延特性,改变射弹散布与目标的重合度;控制弹丸飞行的动平衡,采用合理的弹丸转速,可有效降低起始扰动。分析结果可为校正终点偏差,提高射击精度和密集度提供理论依据。

The influence of Coriolis inertia force of Gatling automata on the terminal deviation of the projectile will reduce the firing accuracy and density.Using the finite element software to perform modal analysis of the automata the relevant parameters are obtained,and the barrel vibration deflection angle is determinedusingspatial analytic geometry.According to the deflection angle and Coriolis theorem,the Coriolis inertial force of a certain Gatling automata is obtained.Combined with the external ballistic theory,the mathematical model of the influence of Coriolis inertial force on the nutation of the projectile is established.It is found that the cut-off speed of the projectile increases with decreasing Mach number;the Coriolis inertia force reaches the maximum when the projectile belt is about to fly out of the muzzle;the initial nutation angle affects the extensional characteristics of the projectile nutation in a certain direction,changing the projectile dispersion and the target's coincidence degree;and that controlling the dynamic balance of the projectile flight and adopting reasonable projectile speed can effectively reduce the initial nutation speed disturbance.The analysis results can provide a theoretical basis for the correction of terminal deviation and the improvement of firing accuracy and dispersion.