Three-dimensional calculation of internal electromagnetic pulse within metallic cavities of any shapes
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摘要: 提出了模拟任意形状腔体中的内电磁脉冲的三维直角坐标系时域有限差分(FDTD)算法。该算法采用FDTD共形网格技术模拟任意形状腔体的边界，可以解决腔体内非对称的边界问题。推导了射线斜入射的差分方程，进行了三维数值计算，并采用直角坐标系FDTD算法和柱坐标系FDTD算法计算了射线斜入射圆柱腔体产生的内电磁脉冲，二者吻合很好，验证了直角坐标系FDTD算法正确性。Abstract: This paper proposes a finite-difference time-domain(FDTD) method to calculate the internal electromagnetic pulse (IEMP) within cavities of any shapes in three-dimensional rectangular coordinate system. By adopting conformal FDTD techniques, this method can analyze the IEMP within cavities of any shapes, even when there is an asymmetric border in the cavity. The finite-difference equations have been deduced when the cavity is under oblique incidence of rays. The IEMP within a cylindrical cavity under oblique incidence is calculated by the method proposed in this paper and the FDTD method in cylindrical coordinate system, respectively. The results of the two methods agree well with each other, proving the accuracy of the FDTD method proposed.
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