增强型电磁轨道炮电枢轨道接触特性研究

为研究增强型电磁轨道炮电枢轨道接触特性，通过实际发射试验得到炮口电压、轨道电流、电枢速度和位移等数据以及发射器机械结构的实际参数。在分析电枢在膛内运动过程的基础上，建立了接触电阻与炮口电压、轨道电流、电枢速度、电枢位移等物理量之间的数学模型。进一步分析了在互感系数不同情况下电枢的接触电阻变化规律。将该变化曲线与试验轨道三维建模模型损伤图形和实际发射试验后轨道图像进行比较，发现轨道烧蚀和摩擦损伤情况随着电枢位移和接触电阻变化呈现烧损、滑动和磨损等典型特征，为预测轨道损伤提供了参考依据。

Research on Contact Characteristics of Armature and Rail in Augmented Electromagnetic Railgun

In order to explore the contact characteristics of armature and rail in augmented electromagnetic railgun,the muzzle voltage,rail current,armature velocity and displacement are obtained by actual launching test.Taking the mechanical structure parameters of launcher into account,a mathematical model among contact resistance,muzzle voltage,rail current,armature speed and displacement is established based on the analysis of the motion process of armature in the bore.The change law of contact resistance under the condition of different mutual inductance coefficients is analyzed.The change curve of contact resistance is compared with the 3 D model of the test track and the damage image of rail after the actual launching test,respectively.The comparative results show that the ablation and friction damage of rail show several typical characteristics,such as burning,sliding and abrasion,due to the changes of armature displacement and contact resistance.