摘要
从时变电磁场泛定方程和动态矢量位出发 ,推导出高层建筑物内雷电暂态磁场的计算公式。该公式可计及雷电流波头陡度对磁场的影响。以该公式为基础 ,给出了相应的数值算法。该算法将暂态磁场计算在时间上和空间上加以离散化 ,对防雷系统钢筋结构中各分支加以分段处理 ,利用各分段载流分支所产生磁感应强度的矢量合成 ,来求取建筑物内指定空间场点的磁场和指定空间区域中的磁场分布。通过算例比较表明 。
An efficient formula is derived from Maxwell equations for calculating the transient magnetic field inside the high buildings struck by lightning. The formula can reflect the influence of the wavefront steepness of lightning current on the transient magnetic field. Based on the formula, a numerical algorithm is proposed, in which a discretization procedure is made in time and space to the field calculation. From the algorithm, the magnetic flux density can be given at each space point and the field distribution can be further obtained for an arbitrarily assigned zone inside the high buildings. By comparing the calculated result with the measured one, a better agreement is shown between them.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2001年第1期40-43,共4页
Proceedings of the CSEE
基金
北京自然科学基金项目(3942007)
教育部高等学校骨干教师资助计划项目(9600303)
关键词
雷击
暂态磁场
磁感应强度
lightning stroke
transient magnetic field
magnetic flux density
