为将砂弹应用于靶场的火炮外弹道试验,对某型105mm榴弹弹丸改装前后的特征量差异进行了统计分析,提出了弹丸特征量散布的概念,并以动力平衡角为媒介,应用外弹道理论推导出弹丸质心位置和极转动惯量与射弹散布的关系公式,计算得到了满足弹丸飞行稳定性的特征量范围和满足射弹散布指标要求的特征量散布范围,经分析发现基于目前工艺改装砂弹的理论射弹散布较大,因此没有理由将砂弹直接应用于火炮外弹道试验。

In order to make sandy shrapnel be used in gun exterior ballistical test, the difference of a certain type of shrapnel's characteristic quantity before and after retrofit was statistically analyzed. The concept of characteristic dispersion was put forward, with dynamic balance angle, the exterior ballistics theory was applied to analyze polar rotational inertia of bullet and centroid position affecting the projectile dispersion, and the range of shrapnel's characteristic quantity satisfying flight stability was calculated. The shrapnel's characteristic quantity pre-and post retrofit was studied applying to the projectile dispersion. By means of analysis and calculation, it is found that sandy shrapnel based on the process level would produce severe projectile dispersion, and there is no excuse to make the sandy shrapnel be used in gun exterior ballistical test.