针对弹丸结构特征数计算只能得到平均值而不能得到极限值、偏心距数值计算问题未见有研究文献,进而无法准确分析弹丸外弹道飞行运动特别是引信设计所关注的极限弹道环境问题,提出了利用弹丸力学参数实测数据拟合其数学分布并进一步研究其分布特性的方法。某82mm口径迫弹五种力学参数均不符合正态分布,其中轴向质心位置和极转动惯量也不符合Weibull分布,但弹丸偏心距、质量和赤道转动惯量服从三参数Weibull分布,且偏心距还进一步服从Rayleigh分布。

In view of problems that limit values of projectile's structural characteristic parameters and eccentricity can't be calculated, projectile motion in external trajectory, especially the limited ballistic environment which is important for fuze design can't be analyzed accurately, the method of fitting and resea ching mathematical distribution of projectile's mechanics parameters according to the measured data was proposed here. A 82 mm-caliber mortar projectile's five kinds of mechanics parameters do not obey normal distribution. Axial centroid position and polar moment of inertia do not obey Weibull distribution either. But eccentricity, mass and moment of inertia of the equator obey three-parameter Weibull distribution, and eccentricity further obeys Rayleigh distribution.