Radiated Fields From Lightning Strikes to Tall Structures: Effect of Upward-Connecting Leader and Reflections at the Return Stroke Wavefront
Radiated Fields From Lightning Strikes to Tall Structures: Effect of Upward-Connecting Leader and Reflections at the Return Stroke Wavefront
复制标题
DOI：
10.1109/temc.2010.2076815
复制
发表时间：
2011-03
影响因子：
2.1
通讯作者：
A. Mosaddeghi;F. Rachidi;M. Rubinstein;F. Napolitano;D. Pavanello;V. Shostak;W. Janischewskyj;M. Ny
中科院分区：
文献类型：
--
作者：
A. Mosaddeghi;F. Rachidi;M. Rubinstein;F. Napolitano;D. Pavanello;V. Shostak;W. Janischewskyj;M. Ny
提出了雷击工程回击模型对高层结构的扩展，该模型考虑了回击波前可能存在的反射以及向上连接先导的存在。基于 Shostak 等人提出的方法，导出了沿河道的电流分布和撞击对象的封闭式迭代解。将磁场的仿真结果与雷击加拿大国家电视塔 (553 m) 相关的实验波形进行了比较。结果表明，考虑回程波前的反射可以更好地符合磁场波形的精细结构。此外，获得的结果与实验观察结果更加一致，再现了早期窄下冲和远场过零。结果还表明，高层结构辐射场的典型双峰响应可能是由于向上连接的先导和回程波前反射的综合效应造成的。
An extension of the engineering return-stroke models for lightning strikes to tall structures that takes into account the presence of possible reflections at the return-stroke wavefront and the presence of an upward-connecting leader is presented. Based on the approach proposed by Shostak et al., closed-form, iterative solutions for the current distribution along the channel, and the strike object are derived. Simulation results for the magnetic fields are compared with experimental waveforms associated with lightning strikes to the CN Tower (553 m). It is shown that taking into account the reflections at the return-stroke wavefront results in better agreement with the fine structure of the magnetic-field waveforms. Moreover, the obtained results are in better agreement with experimental observations, reproducing both the early narrow undershoot and the far-field zero crossing. The results also suggest that the typical double-peak response of the radiated fields from tall structures might be due to the combined effect of upward-connecting leaders and reflections at the return-stroke wavefront.