共查询到18条相似文献,搜索用时 109 毫秒
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通过变量代换平滑三角形上推迟位(标量位函数和矢量位函数)并消除推迟矢量位旋度的奇异性,使得采用数值积分法就能够精确快速地计算任意正则时间基函数与推迟位函数及推迟矢量位旋度之间的时间卷积运算,可用于基于任意类型时间基函数的时域电场、时域磁场及其混合场积分方程时间步进(MOT )算法。与时间卷积运算的解析法对比分析表明,该时间卷积数值积分方法能够精确快速地计算基于任意类型时间基函数和不同时间步长条件下时域积分方程MOT算法的阻抗矩阵元素;而具体的计算实例也表明,阻抗矩阵的精确计算显著地提升了时域积分方程MOT算法的后时稳定性和求解精度。 相似文献
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对二维理想金属导体柱的时域电场积分方程(TDEFIE)后期振荡问题提出了一种新的时间平均方法,此方法用前一时刻和后一时刻的值来修正当前时刻的电流值,消除了振荡,而且相对以往的平均方法提高了MOT算法的稳定性,对精度的影响很小。这里采用电场积分方程(EFIE)MOT算法的隐式格式(Implicit),在TM,TE高斯平面波激励情况下分别计算了两个例子:圆柱和方柱。又采用一种新的时间基函数BLIFs来结合新的时间平均法,取得了很好的效果。经过Matlab软件的数值分析,可以看出此时间平均法更加稳定和精确。 相似文献
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A fast Time Domain Integral Equation (TDIE) solver is presented for analysis of transient scattering from electrically large conducting complex objects. The numerical process of March-ing-On-in-Time (MOT) method based TDIE encounters high computational cost and exorbitant memory requirements. A group-style accelerated method–Plane Wave Time Domain (PWTD) algorithm, which per-mits rapid evaluation of transient wave field generated by temporally bandlimited sources, is employed to reduce the computational cost of MOT-based TDIE solvers. An efficient compressed storage technique for sparse matrix is adopted to decrease the enormous memory requirements of MOT. The scheme of the Multi-Level PWTD (MLPWTD)-enhanced MOT with compressed storage for sparse matrix is presented for analysis of transient scattering from electrically large complex objects in this paper. The numerical simulation results demonstrate the validity and efficiency of the presented scheme. 相似文献
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A new temporal basis function that has all-order continuous derivative has been constructed using a nonlinear optimization scheme. This new basis function provides a much more stable explicit marching-on-in-time (MOT) solution, based on the time-domain integral equation (TDIE) method, than that presently available. Two examples are presented to illustrate the superior stability of the proposed temporal basis function 相似文献
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本文推导了一种改进的时域积分方程(TDIE)方法,用于计算任意导体目标的瞬态电磁散射问题.采用隐式时间步进法,对典型导体目标包括尖劈板、立方体、导体球和球冠锥体进行了求解,得到了正确的瞬态响应结果,没有发现后期不稳定性现象. 相似文献
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A stable solution of time domain electric field Integral equation for thin-wire antennas using the Laguerre polynomials 总被引:5,自引:0,他引:5
Zhong Ji Sarkar T.K. Baek Ho Jung Young-Seek Chung Salazar-Palma M. Mengtao Yuan 《Antennas and Propagation, IEEE Transactions on》2004,52(10):2641-2649
In this paper, a numerical method to obtain an unconditionally stable solution of the time domain electric field integral equation for arbitrary conducting thin wires is presented. The time-domain electric field integral equation (TD-EFIE) technique has been employed to analyze electromagnetic scattering and radiation problems from thin wire structures. However, the most popular method to solve the TD-EFIE is typically the marching-on in time (MOT) method, which sometimes may suffer from its late-time instability. Instead, we solve the time-domain integral equation by expressing the transient behaviors in terms of weighted Laguerre polynomials. By using these orthonormal basis functions for the temporal variation, the time derivatives can be handled analytically and stable results can be obtained even for late-time. Furthermore, the excitation source in most scattering and radiation analysis of electromagnetic systems is typically done using a Gaussian shaped pulse. In this paper, both a Gaussian pulse and other waveshapes like a rectangular pulse or a ramp like function have been used as excitations for the scattering and radiation of thin-wire antennas with and without junctions. The time-domain results are compared with the inverse discrete Fourier transform (IDFT) of a frequency domain analysis. 相似文献