中文摘要：

针对导轨式电磁发射装置动态发射过程中的物理场计算问题，基于发射装置的二维控制方程，推导出相应的有限元离散方程，并根据计算模型的特点，采用自由度平移法处理运动问题保证求解区域不变，建立了考虑摩擦热下的电磁一温度一运动耦合场有限元数值计算模型。根据模型计算得出了不同电枢运动下的电流密度及磁场分布，并分析了温度场在电枢轨道接触面的分布特性，结果表明：电枢运动速度越大，速度趋肤效应越明显，枢轨接触面处的电流密度、接触压强及温升越大。

英文摘要：

Focusing on the physical field numerical calculation of dynamic launching processing for the electromagnetic rail launcher, based on two-dimension governing equation of rail launcher, the finite element discrete formulation of electromagnetic rail launcher is derived. According to the feature of the calculation geometry, shifted degree of freedom （DOF） method is discussed to deal with moving problem. Considering the frictional heat, the finite element model of transient electromagnetic- thermal-movingcoupling problem in two dimensions is established by this method. The current density and magnetic flux density distributions at different armature speeds are calculated and the characteris- tics of thermal field on contact region are analyzed. The results show that as the armature velocity in- crease, the velocity skin effect is more notable and the max value of current density, contact pressure and temperature rise on the interface of rail and armature are larger at the same time.