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These show that whereasCn for the chain in free solution converges instantaneously, the characteristic ratio of the attached chain is only a slowly converging function.




 Aiming at overcoming and improving the insufficiency of existing methods, the paper goes into the numerical calculation of grounding system in every detail using boundary element method(indirect one), and derives BEM approximate approach and its computing formulae dealing with uniform soil, vertical layerbuilt soil and the soil derided in horizontal direction respectively. On the problem with optionally distributed domainbuilt soil, the general principle of trearment is given.The supplemented counting data... Aiming at overcoming and improving the insufficiency of existing methods, the paper goes into the numerical calculation of grounding system in every detail using boundary element method(indirect one), and derives BEM approximate approach and its computing formulae dealing with uniform soil, vertical layerbuilt soil and the soil derided in horizontal direction respectively. On the problem with optionally distributed domainbuilt soil, the general principle of trearment is given.The supplemented counting data obtained from《The Calculation Program of Grounding System with Boundary Element Method》which possesses automatically converging function and the consideration of symmetrical problem are satisfactory while compared with those from practical measurment and simulating experiment.  应用边界单元法(间接解法)对按地问题的计算进行了较详尽的探讨。基于克服和改进现有计算方法所存在的不足,本文分别椎导了均匀土壤,垂直及水平方向分层均匀土壤中边界单元法近似解和计算格式。对任意分布的分区域均匀土壤中接地问题提出了一般处理方法。文中所附具有对称性处理和自动收敛功能的接地问题边界单元法计算程序的计算数据和实测、模拟数据的比较,其结果甚为理想。  In this paper, the technique ofτp poststack migration and the procedure of its implementation were discussed in considerable detail and the formula of "migration transformation"in τp domain was also derived.The validity of this technique was verified in two aspects: one of which is to illustrate its convergence characteristics in terms of point diffraction hyperbola, the other is to prove that the τp migration and the FK migration are in essense to be the same or "equivalent" . Lastly,the relationship between... In this paper, the technique ofτp poststack migration and the procedure of its implementation were discussed in considerable detail and the formula of "migration transformation"in τp domain was also derived.The validity of this technique was verified in two aspects: one of which is to illustrate its convergence characteristics in terms of point diffraction hyperbola, the other is to prove that the τp migration and the FK migration are in essense to be the same or "equivalent" . Lastly,the relationship between the τp transformation and the 2D Fourier transformation, the relationship between their transform were talked over in passing.  本文详细地讨论了叠后Tau—P偏移方法和实现步骤,导出了Tau—P域“偏移交换”公式。我们从两个方面验证了该方法的正确性,一是以点绕射双曲线为例,说明方法所具有的收敛功能,二是给出了Tau—P偏移与F—K偏移的等价证明。最后,我们顺便讨论了Tau—P变换与二维傅氏变换的联系及转换关系。  Among the numerical methods.both of FiniteDifference and FiniteElement are used very popularly,Results of their programs are a set of linear equations or nonlinear equations to be solved,The OverRelaxation method is not only convenient and efficient method but also can speed up the convergency in the procedure of solution, In this paper,we provide a simple method to determine the optimum value of the OverRelaxation factor and show an example through a FiniteElement programs of 2dimensional steady state... Among the numerical methods.both of FiniteDifference and FiniteElement are used very popularly,Results of their programs are a set of linear equations or nonlinear equations to be solved,The OverRelaxation method is not only convenient and efficient method but also can speed up the convergency in the procedure of solution, In this paper,we provide a simple method to determine the optimum value of the OverRelaxation factor and show an example through a FiniteElement programs of 2dimensional steady state conduction problem.  在数值解法中,普遍采用有限差分和有限单元法,两种程序所得结果都是一个待解的线性或非线性矩阵方程。超松弛迭代解法不仅算法语言简明,而且具有加速迭代收敛的功能。本文通过两维稳态导热有限单元法的实例分析,给出了确定超松弛因子最佳值的一种简单方法。   << 更多相关文摘 
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