A Macromodeling-Based Hybrid Method for the Computation of Transient Electromagnetic Fields Scattered by Nonlinearly Loaded Metal Structures
A Macromodeling-Based Hybrid Method for the Computation of Transient Electromagnetic Fields Scattered by Nonlinearly Loaded Metal Structures
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DOI：
10.1109/temc.2020.2991455
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发表时间：
2020-07
影响因子：
2.1
通讯作者：
T. Wendt;Cheng Yang;Heinz D. Brüns;S. Grivet-Talocia;C. Schuster
中科院分区：
文献类型：
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作者：
T. Wendt;Cheng Yang;Heinz D. Brüns;S. Grivet-Talocia;C. Schuster
在本文中，我们提出了一种混合数值方案来计算加载有集总非线性载荷的金属结构所散射的瞬态电磁场。所提出的方案基于三个连续步骤。首先，使用矩量法 (MoM) 公式在频域中解决消除了非线性载荷的结构的场耦合问题。因此，卸载结构被表征为广义多端口戴维宁等价物，其组件通过执行一组有理近似和随后的闭合形式拉普拉斯变换反演来表示为时域算子。然后使用标准电路求解器计算存在非线性负载时的瞬态端口电压和电流。最后一步，使用 MoM 求解器使用替换定理在频域中再次求解辐射问题，然后通过有理逼近和递归卷积运算将结果转换到时域。所提出的方法能够准确有效地评估负载结构的瞬态非线性散射场，具有良好的可扩展性到大规模高复杂性非线性屏蔽的潜力。提供了广泛的验证来证明所提出的方法的准确性，该方法在这里应用于能量选择性屏蔽的表征，以保护敏感设备免受高强度辐射场的影响。
In this article, we present a hybrid numerical scheme to compute the transient electromagnetic fields scattered by a metallic structure loaded with lumped nonlinear loads. The proposed scheme is based on three successive steps. First, the field coupling problem to the structure with the nonlinear loads removed is solved in the frequency domain using a method-of-moments (MoM) formulation. The unloaded structure is thus characterized as a generalized multiport Thevenin equivalent, whose components are represented as time-domain operators by performing a set of rational approximations followed by closed-form Laplace transform inversion. Transient port voltages and currents in the presence of nonlinear loads are then computed using a standard circuit solver. As a last step, the substitution theorem is used to solve the radiation problem again in the frequency domain using a MoM solver, the results of which are then translated into the time domain by means of rational approximations and recursive convolution operations. The proposed method enables an accurate and efficient evaluation of the transient nonlinearly scattered fields by the loaded structure, with a good potential for scalability to large-scale high-complexity nonlinear shields. Extensive validations are provided to demonstrate the accuracy of the proposed method, which is here applied to the characterization of energy-selective shielding for protection of sensitive devices from high-intensity radiated fields.