动力飞行体电磁脉冲效应数值分析

NUMERICAL SIMULATION OF EMP EFFECTS ON BOOST FLYER

利用时域有限差分方法模拟了在不考虑等离子体高温尾焰情况下，电磁脉冲与动力飞行体的相互作用。计算结果表明：在入射电磁脉冲的作用下，飞行体蒙皮上将感应很大的皮电流；感应电流密度的波形为衰减振铃信号波形，振铃周期等于电流波在整个飞行体长度上流动两次的时间；感应皮电流密度分布的特点是飞行体两端电流密度小，中部大。

In this paper,electromagnetic pulse (EMP) interaction with the boost flyer is simulated by the use of Finite Difference Time Domain method .Computational results indicate that a strong skin current is induced on the surface of the flyer under the action of EMP. The waveform of the induced current is a decreased ringing wave and the ringing period equals twice to the time of induced current flowing along the flyer. The results also indicate that the character of the current distributed over the flyer is stronger in the middle and weaker in both ends.