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一种计算HEMP环境下电缆感应电流的混合算法
Hybrid algorithm for calculating cable current response in high-altitude electromagnetic pulse environment
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摘要: 对高空核爆电磁脉冲(HEMP)环境下、地面上方电缆的感应电流进行了研究.考虑有耗地面的影响,提出了一种将时域积分方程(TDIE)和时域传输模式法结合求解有耗半空间上方电缆瞬态电流的时域方法.通过电磁波本征模的关联性得到斜入射有耗半空间平面波的时域反射系数,不需计算贝塞尔函数的无穷项和便可以得到时域反射系数的精确解.最后给出了核爆脉冲照射下地面上方电缆感应的电流的仿真结果.结果表明:对于水平放置的电缆,当反射脉冲到达电缆后,反射场总是试图抵消入射场,使得电缆上感应电流小于只考虑入射脉冲时的感应电流;电缆的耦合电流会随架设的高度发生显著变化,相对于铺地的电缆,架空的电缆有更大的感应电流.Abstract: The effect of the high-altitude nuclear explosion pulse on cable above ground is studied.Considering the effect of ground,Time Domain Integral Equation(TDIE) combined with reflection coefficient method are proposed to solve the transient current of the cable above ground.The time domain reflections of electromagnetic waves from half-space are obtained by eigenmodes method.The exact solution of time reflection coefficient could be obtained without calculating the infinite term of the Bessel function.Finally,the simulation results of the current induced by the cable above the ground are given.The results show that the reflection field always tries to cancel the incident field when the reflection pulse reaches the horizontal cable,the induced current on the cable is less than that only considering the incident pulse.The coupling current of the cable varies significantly with the height above ground,the overhead cable has a larger coupling current compared to the ground cable.
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