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数值色散
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  numerical dispersion
     Analysis on Numerical Dispersion of One-dimensional ADI-FDTD Method
     一维ADI-FDTD方法的数值色散分析
短句来源
     Analysis of the Numerical Dispersion of Higher Order ADI-FDTD
     高阶ADI-FDTD算法的数值色散分析
短句来源
     Analysis on Numerical Dispersion of Two-Dimensional ADI-FDTD
     关于二维ADI-FDTD方法的数值色散分析
短句来源
     Numerical analysis results indicate that the numerical dispersion errors are also the key factor determining the time step in the US-FDTD method as in the ADI-FDTD method.
     数值分析表明,与ADI-FDTD方法一样,数值色散误差仍然是决定US-FDTD时间步长选取的关键因素。
短句来源
     Numerical Dispersion of Higher-Order FDTD (2,4) and Applications to Microstrip Antenna
     FDTD(2,4)算法的数值色散特性及其在微带天线中的应用研究
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  “数值色散”译为未确定词的双语例句
     The numerical stability and dispersion properties of the two dimensional(2-D) US-FDTD method is studied.
     研究了二维US-FDTD方法的数值稳定性和数值色散特性。
短句来源
     Three-Dimensional ADI-FDTD Analyses onNumerical Dispersion
     关于三维ADI-FDTD方法的数值色散分析
短句来源
     Finally,the numerical relation errors caused by the US-FDTD are investigated.
     分析了US-FDTD方法的数值色散误差。
短句来源
     Although the high order schemes have almost the same stability as the FDTD,the fourth order scheme with a fourth order approximation in spatial direction(T4S4) has the superior numerical dispersion-isotropic properties of the scheme.
     四阶辛算法结合四阶精度的空间差分格式(T 4S4)较FDTD法具有更为优越的数值色散性.
短句来源
     The method is unconditionally stable,and the maximum time-step size is not limited by the Courant-Friedrich-Levy (CFL) condition,but rather by numerical errors.
     该方法是非条件稳定的 ,时间步长不再受到Courant稳定条件的限制 ,而是由数值色散误差来确定 .
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  相似匹配句对
     Numerical Analysis of Dispersive and Nonlinear Effect
     色散和非线性效应的数值研究
短句来源
     NUMERICAL RESEARCH ON PLASMA DISPERSION FUNCTION
     等离子体色散函数的数值计算研究
短句来源
     The computational result is compared with G.
     数值结果和G.
短句来源
     CHROMATIC DISPERSION IN FIBER OPTICS
     光纤的色散
短句来源
     (2) numerical simulation;
     数值模拟;
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  numerical dispersion
Genetic algorithm in reduction of numerical dispersion of 3-D ADI-FDTD method
      
A new method to reduce the numerical dispersion of the three-dimensional Alternating Direction Implicit Finite-Difference Time-Domain (3-D ADI-FDTD) method is proposed.
      
Firstly, the numerical formulations of the 3-D ADI-FDTD method are modified with the artificial anisotropy, and the new numerical dispersion relation is derived.
      
In addition the reduction of the numerical dispersion is investigated as the objective function of the AGA.
      
This paper presents the calculation of truncation errors, namely numerical diffusion and numerical dispersion for various finite difference schemes.
      
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in this paper, the Finite—Difference Time—Domain (FD—TD) method is introduced to the study of electromagnetic scattering of infinite—long cylinders buried in lossy medium illuminated by sinusoidal plane wave. Current induced in cylinders and near scattered fields above the planar interface are given. The contour path method (CPM) is used to model the curved surface of circular cylinder in order to increase calculating precision. The dispersion relation of FD—TD method and the absorbing boundary condition in...

in this paper, the Finite—Difference Time—Domain (FD—TD) method is introduced to the study of electromagnetic scattering of infinite—long cylinders buried in lossy medium illuminated by sinusoidal plane wave. Current induced in cylinders and near scattered fields above the planar interface are given. The contour path method (CPM) is used to model the curved surface of circular cylinder in order to increase calculating precision. The dispersion relation of FD—TD method and the absorbing boundary condition in lossy medium are derived. Comparisons between the FD—TD's data and that of others are made. It verified the validity of FD—TD method in solving such kind of problems.

本文利用时域有限差分(FD-TD)方法分析计算了正弦平面波照射下埋地二维金属柱体的电磁散射特性,给出了柱体上的感应电流值和地面上方近场区的电磁场值。讨论了有耗介质中差分网格的数值色散特性和吸收边界条件。通过将本文用FD—TD计算结果与其它数值结果进行比较.证实了FD—TD方法在分析有耗介质中电磁散射问题的有效性。

In this paper the numerical dispersion characteristics of nonorthogonal FDTD algorithm in two- dimensional oblique Cartesian coordinates are discussed in detail. The numerical dispersion equation is derived and the dispersion curves in a varity of cases are obtained. The theoretical results show that the dispersion effects are related tightly with the grid sizes, the direction of the wave propagation and the angles between two edges of each grid. When the nonorthogonal FDTD algorithm is used in practice to resolve...

In this paper the numerical dispersion characteristics of nonorthogonal FDTD algorithm in two- dimensional oblique Cartesian coordinates are discussed in detail. The numerical dispersion equation is derived and the dispersion curves in a varity of cases are obtained. The theoretical results show that the dispersion effects are related tightly with the grid sizes, the direction of the wave propagation and the angles between two edges of each grid. When the nonorthogonal FDTD algorithm is used in practice to resolve electromagnetic problems in time domain, in order to reduce the numerical dispersion effects the grids in the computational space should be chosen to have as closely similar shapes and same sizes as possible.

本文详细讨论了二维非正交坐标系下FDTD方法的色散特性,导出了其数值色散方程.理论计算结果表明,非正交FDTD方法的空间色散与网络尺寸、网络内角、波传播方向有密切关系.同时指出,在应用非正交FDTD方法解决有关时域电磁问题时,网格的部分应尽量选取网格边长相接近,夹角接近90.的情况,以减少此方法的数值色散.

In order to keep the physical dimensions of grids as nearly square as possible and reduce the grids in computation donaim so as to save the computer resource and lesssen FDTD nu merical dispersion,a multiple zone meshing method is proposed in obliquely Cartesian coor dinates system. The feasibility of the meshing method has been demonstrated by comparing the numerical results with experimental data of the current on a long triangular cylinder.

在仿射价坐标系下,为了进一步减少网格剖分时FDTD计算区域内的网格数目,节省计算机资源,且使得网格形态接近矩形以减少数值色散,提出了FDTD分区域的剖分方法,并以无限长三角形金属柱体为例进行了数值计算。计算结果与测试结果的比较证明了此方法的有效性

 
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