数值方法

In recent years, considerable attention has been devoted to the study of polynomial nonlinear systems in numerical approach, especially by using semidefinite programming and the sum of squares decomposition.

近年来，通过数值计算的方法对多项式非线性系统进行研究取得了相当多的关注，尤其在半定规划方法和平方和分解方法上，并取得了一系列成果。

Statistical Energy Analysis is a module measure, which use relationship of energy flow to evaluate dynamics, vibrating response level and sound radiation of the mulriple and syntonic assembly structure.

统计能量分析是个模块化方法，它运用能量流关系式对复合的、谐振的组装结构进行动力特性、振动响应级及声辐射的理论评估，SEA特别适用于高模态密度的高频区，传统的数值计算方法如有限元和边界方法对应力和振动建模获得了很大成功，但对噪声应用存在明显的局限。

An analytical method is proposed for calculating free torsion constant of complicated thinwalled cross section from free torsion theory.

通过自由扭转理论推导出复杂薄壁箱梁断面的自由扭转惯性矩的计算方法；采用实际复杂薄壁箱梁断面进行了数值验证，并和使用有限元方法计算的结果进行了比较。结果表明，这是一种简单实用且精度较高的计算方法

The characteristics of air conditioning load in the underfloor air supply rooms were analyzed, and the difference between underfloor air supply air conditioning and the traditional in load calculation method was pointed out.

分析了下送风房间空调负荷的特点，指出了下送风空调系统与传统空调系统在负荷计算方法上的差异，介绍了2种目前用于下送风空调负荷计算的主要方法即数值计算法和修正系数法，并对2种方法的计算特点、适用范围等进行了详细论述。

Comparing to the standard specification, numerical calculation has some merits, i.e., high precision, unstinted with lay down, which may be applied to determine actual current capacity for power scheduler department.

利用数值计算的方法确定地下敷设电力电缆及其环境的温度场，并由此确定电缆的载流量与标准给定方法相比具有精度高、基本不受敷设条件限制等优点，为电力调度部门提供了一个可以用于工程实际的载流量确定方法。

In this paper, the space-time finite element theory and its application technologies are studied and discussed. Furthermore the space-time finite element method is used to analyze the transient characteristics of electromagnetism equipments. The work is important to develop the numerical method for the transient electromagnetic field. The detailed work is as follow.In the basis theory of finite element method used in the transient engineering problem, the functional theory and the finite element theory are applied to studied the existence condition of a generalized variation principle, which is the basis of the space-time finite element method.

本文在完善时空有限元法的基础理论和应用技术并将该方法应用于解决电磁装置的瞬态过程分析等相关方面进行了深入的研究与探讨，该工作对于发展瞬变电磁场问题的数值计算方法具有重要的意义，为此进行了如下几方面的工作：在工程瞬变问题的有限元方法的基础理论方面，本文应用泛函理论和有限元理论，系统讨论了一般工程瞬变问题的变分定理的存在条件及对应的变分定理。

The obtained results a re compared with analytic solution and those from integral equation and other me ans. It is shown that the staggered grid finite difference method combined with the Biconjugate gradient iterative solver processed with divergence correction and incomplete Cholesky decomposition procedures can efficiently improve the three dimensional electromagnetic calculation with high accuracy and stability.

经与解析方法、积分方程等其他方法的计算结果对比表明，交错网格有限差分法结合散度校正和不完全乔累斯基分解预处理的双共轭梯度迭代方法进行正演计算，速度快、精度高、结果稳定，能适应三维复杂介质的数值模拟，为三维电磁反演奠定了基础。

In this paper, several traditional models for computing are introduced at first. Conferring probability theory, the load boundary condition of that collector is analyzed, the characteristic values of Tubesheet in different design reference periods are computed. Based on homogenization method, after lots of numerical experiments, the mechanical characteristic of Tubesheet controlled different structure parameters is studied, and an empiristic formulas that could simplify Tubesheet to stiffen plate is gained. Then, G-M method is employed and Tubesheet is simplified to a normal plate.

本文在总结传统计算方法的基础上，参考概率设计方法，分析了大型袋式除尘器的荷载边界条件，计算了不同设计基准期下的花板可变荷载标准值，结合均匀化方法，通过大量数值实验，得出了不同参数对花板受力性能的影响规律，并拟合了将花板简化为加劲板的经验公式，再参考正交异性板法，最终推导了花板简化为均匀平板的经验公式。

In this paper, the generator model of constant transient voltage and the invariableness impedance model was used, and the saliency of generator is included; through the analysis of the characteristic of the network equation calculation in the transient stability analysis, a new node ordering algorithm is proposed. Better initial value can accelerate the convergence rate of the networking equations, reduce the number of iterations, thus to cut down the amount of calculating time.

本文首先建立了适合于暂态稳定分析的简单模型，其中发电机采用E_q恒定模型，考虑了发电机的暂态凸极效应，负荷采用恒定阻抗模型；研究了电力系统的暂态稳定分析方法，指出目前数值积分暂态稳定计算方法中存在的不足，主要是网络方程的求解速度过慢；分析了暂态稳定计算中网络方程的特点，将稀疏技术应用于网络方程的求解，提出了一种新的节点编号方法——最小度最小有源节点道路集算法，减少了网络方程的计算量；在进行交替迭代求解时，将预测算法应用于每一积分步网络方程功角和电压的初值估计当中，应用自回归算法和广义延拓算法，期望给出一个更有效的电压和功角初值方案，来加快方程的收敛过程，减少方程迭代的次数，以提高计算速度。

CB Predictor forecasts your values using each of the selected methods and ranks them according to how well they fit the historical data. CB Predictor uses the seasonal methods as well as the nonseasonal methods if you indicate on the Data Attributes tab that your data series have seasonality.

CB Predictor使用每个选择的方法来预测数值，并将产生预测值的最佳方法进行排序，如何你的数据系在数据分布图中显示的是有周期性的，那么CB Predictor也会选择周期性的方法，而不是非周期性的。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。