The round steel plate is the basic component of the external floating roof tank structure. Modeling large-size round steel plates is essential for analyzing the lightning response of external floating roof tanks. This article builds time-domain equivalent circuit models for round steel plates excited by the lightning current. First, a meshing scheme is presented to generate sector and cylindrical surface cells, which make use of the distribution characteristics of the currents and voltages on the round steel plates. Then, the surface partial element equivalent circuit (PEEC) approach is applied to model the plate. A method of calculating the equivalent surface impedance is proposed, which converts the frequency dependence of the skin effect into impedance based on the time domain. Finally, the time-domain surface PEEC approach is validated by the indirect time-domain solution based on the Fourier transform and the commercial software using the finite-difference time-domain technique, respectively. The comparisons show that the calculation results of different methods are consistent with each other. However, the proposed method in this article can greatly enhance the computational efficiency while meeting the accuracy requirements. It has great significance to the study of lightning protection for external floating roof tank.

中文翻译：

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采用表面 PEEC 方法对大尺寸圆钢板进行建模以进行雷电瞬态分析


圆钢板是外浮顶罐结构的基本组成部分。大尺寸圆钢板建模对于分析外浮顶储罐的雷电响应至关重要。本文建立了雷电流激励圆形钢板的时域等效电路模型。首先，提出了一种网格划分方案来生成扇形和圆柱表面单元，该单元利用了圆形钢板上电流和电压的分布特性。然后，应用表面部分元件等效电路（PEEC）方法对板进行建模。提出了一种计算等效表面阻抗的方法，将集肤效应的频率依赖性转换为基于时域的阻抗。最后，分别通过基于傅里叶变换的间接时域解和使用时域有限差分技术的商业软件验证了时域表面PEEC方法。比较表明，不同方法的计算结果是一致的。然而，本文提出的方法可以在满足精度要求的同时大大提高计算效率。对外浮顶罐防雷研究具有重要意义。