从描述电磁轨道炮炮口电压波形的场路模型出发，构建了电枢/轨道高速滑动接触电阻与轨道电流波形、炮口电压波形、电枢膛内速度曲线和轨道结构参数之间的关系，依据此关系可定量表征电磁轨道炮高速滑动接触电阻。实例计算表明，电枢/轨道高速滑动接触电阻的变化依赖于轨道电流变化，对应电流上升段、平顶段和电流下降段。在平顶段接触电阻最小约0.2 mΩ，在电流上升段和电流下降段，接触电阻达3 mΩ。

Based on the physical model of the electromagnetic railgun, a quantitative expression of sliding contact resistance of electromagnetic railgun is derived. The expression is related to the rail current, muzzle voltage, in-bore velocity of the armature and the rail configuration. The calculated sliding contact resistances between armature and rail depend on rail current. The resistance is different at different region of the rail current. At flat region, the contact resistance is about 0.2 mΩ and at the rising and falling regions, the contact resistance reaches 3 mΩ.