电磁脉冲作用下地面铺设屏蔽电缆蒙皮电流分布的时域计算方法研究
Ｓtudy of numerical method in time domain on a skin current ofground laying shielded cable excited by electromagnetic pulse
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摘要: 为克服传输线理论方法求解电磁脉冲电缆耦合问题存在的不足，对电磁脉冲电缆耦合问题进行了时域求解方法的研究。引入了适用于电磁脉冲电缆耦合问题数值求解的基于细线散射的时域有限差分(FDTD)法，将Gedney's PML进行了扩展，使其可以用于各向同性有耗计算域截断问题的处理。利用建立的数值方法，模拟了电磁脉冲作用下地面铺设屏蔽电缆引起的蒙皮感应电流分布规律及波形特征，并利用辐射波电磁脉冲模拟器对该问题进行了实验研究。计算与实验结果在误差范围内的一致性证明了数值结果的可靠性，以及该时域计算方法在处理电磁脉冲电缆耦合问题的可靠性。
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关键词:
- 时域有限差分(FDTD)法 /
- 电磁脉冲 /
- 屏蔽电缆 /
- 传输线理论
Abstract: A numerical method in time domain on skin current of ground laying shielded cable excited by electromagnetic pulse is studied. The method overcomes the ambiguity of the transmission line theory in studying such a problem. The finite difference time domain (FDTD) method based on the scattering of thin wire which can solve the problem effectively is derived. An extensional Gedney perfectly matched layer is developed. It can be used to truncate FDTD lattices of lossy media.The method is used to simulate the distribution of a skin current and characteristics of waveform on a ground laying shielded cable excited by the electromagnetic pulse. The problems are studied experimentally in the radiated EMP simulator.Compared with experimental data, the numerical results proved to be reliable． -
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