本文主要分析以Poncelet和Parodi阻力公式推导的弹丸对土之类介质的侵彻行程。并对这两种阻力公式之间的关系进行了分析。另外,还对美国当前使用的公式和Vieser侵彻行程公式加以介绍。弹丸与地或其它碍障物相碰时,其轴向速度因受障碍物的阻力而急剧减小,所以,位于弹体内的零件相对弹体受到很大的前冲惯性力。其表达式为F=-(m/M)ρ=-(P/G)ρ(1)式中M、C——弹丸的质量和重量; m、P——弹内零件的质量和重量; ρ——弹丸所受的障碍物阻力。从上式可以看出,要想知道弹体内的零件前冲惯性力,则必须知道弹丸碰击障碍物时所受的阻力。众所周知,阻力公式是在一定实验的基础上得到的。当前国内引信设计书籍介绍中的阻力公式有二种,一种是Poncelet阻力公式;另一种是Parodi阻力公式。这两种阻力公式之间有什么联系呢?Parodi阻力公式是怎么推导出来的?这在当前的书籍中都没有阐述。作者最近研究出了上面两个问题。 This paper mainly analyzes the penetration of projectiles into media like soil derived from Poncelet and Parodi resistance formulas. The relationship between these two resistance formulas is analyzed. In addition, the formula currently used in the United States and Vieser penetration stroke formula is also introduced. When the projectile hits the ground or other obstacles, the axial velocity of the projectile rapidly decreases due to the obstruction of the obstacle. Therefore, the parts located in the projectile are greatly impacted by the inertia force of the projectile. The expression is F = - (m / M) ρ = - (P / G) ρ (1) where M and C are the mass and weight of the projectile, m and P are the mass and weight of the projectile within the projectile, ρ - Projectile obstacle resistance. As can be seen from the above formula, in order to know the inertia of the parts within the projectile, you must know the resistance of the projectile hitting the obstacle. As we all know, the resistance formula is based on a certain experiment. There are two kinds of resistance formulas in the introduction of domestic fuze design books, one is the Poncelet resistance formula and the other is the Parodi resistance formula. What is the relationship between these two resistance formulas? How did the Parodi resistance formula be derived? This is not covered in the current book. The author recently developed the above two issues.