利用时变场理论和瞬态动力学方程建立了电极及其支撑结构的瞬态耦合模型, 分析了瞬态电磁场各参数的分布特点, 并求解了电极及其支撑结构的动态响应状态参数。计算结果表明:玻璃钢支撑结构对于脉冲电流形成的冲击力载荷具有很好的缓冲作用；低弹性模量支撑材料在脉冲上升沿和峰值阶段均会产生波动性形变, 但该波动性形变对电极间距不会造成太大的影响。

To keep good interfacial contact between the sliding armature and the two electrodes of electromagnetic rail thruster, the electrode spacing should fluctuate within an allowable range under the impulse force generated by pulse current. A transient coupled model of the electrodes and their bracing structures is built by time-varying field theory and transient dynamics equation. The distributions of parameters of transient electromagnetic field are analyzed, and the dynamic response parameters of the electrodes and their bracing structures are obtained. The simulated results show that the epoxy bracing structures have good cushioning capacity to resist the impulse force generated by pulse current; the bracing material with low elastic modulus is more easily vibrated at the rising and peak phases of pulse current, and the vibrated deformation has little effect on the electrode spacing.