针对某型迫弹半爆弹射程偏近的问题,对比分析了半爆弹和实弹在射击条件、弹丸质心位置等方面的差异,并运用迫弹静态稳定性理论,推导得到翻转力矩系数导数计算公式,分析了迫弹的飞行稳定性。在传统迫击炮质点弹道模型的基础上,将攻角引入阻力系数计算,推导出攻角与阻力臂的微分方程,运用Matlab程序进行弹道仿真计算,得出质心位置下移导致的阻力臂缩短是射程偏近的主要原因,并提出了避免出现射程偏近的对策措施。

According to the unexpected falling-down of some mortar projectile loading sand the differences of shooting conditions and centroid position between the live ammunition and mortar projectile loading sand is analyzed. The derivative of torque coefficient is derived using static stability theory, and the flight stability is analyzed. On the basis of mortarprojectile point mass trajectory model attack angle is introduced to the calculation of drag coefficient and the differential equation of relationship between drag coefficient and resisting arm. The trajectory simulation is performed by Matlab It is concluded that the short resisting arm is the main reason for unexpected falling-down, and the countermeasures to avoid the unexpected falling-down is presented.