数值分析

In view of poor researches on stress characteristics of soil and lining in the loess highway tunnel, the paper analyses the performances of stress and deformation of soil and lining structure, the process of runnel construction, and water infiltration influences, and makes field observation of stress features of lining structure and theory research of surrounding rock pressure.

鉴于黄土公路隧道土体及衬砌力学特性研究不足的状况，论文针对黄土公路隧道工程进行了土体和衬砌结构受力与变形性状分析、隧道施工过程和浸水影响数值分析、衬砌结构力学特性现场测试和围岩压力理论研究。

Numerical analysis is an important tool for the study of the seepage, deformation and stability of rock slope.

数值分析是岩石边坡渗流、变形与稳定分析等问题的重要研究手段。

In a word,this paper offers an effective calculation analysis means for the skew bridges.

为斜交格子梁桥的内力变形分析研究和工程设计提供了更简便、有效的数值分析计算工具。

The article covers the full research on such aspects as mathematic description, numerical analysis method and their practical applications. The diphase heating surface is divided into a hot water section, a evaporation section and a micro overheat section , the problems of model switching are avoided successfully between subcritical and supercritical working condition in the model of The diphase heating surface, and the model can be used for between subcritical and supercritical working condition without causing the model stiff infinity prick up problem. The mathematical model and dynamic characteristic account is unified and predigested for the diphase heating surface of once—through boiler under subcritical and supercritical pressure, and propose that the working conditions at phase change point could be used as divide criterion between water region and steam region under supercritical pressure, the problems are solved successfully between water and steam phase change point under supercritical pressure.

本文在过程的数学描述、数值分析以及实际应用等方面进行了系统的研究分析，将双相受热面统一划分为热水段、蒸发段和微过热段三段，所建立的双相受热面模型不但成功地避免了超临界工况与亚临界工况间的模型切换，而且消除了由区段划分欠妥所引起的模型刚性无限加剧的问题，统一并简化了超临界及亚临界压力下直流锅炉双相区段的数学模型和动态特性计算，而且提出了利用相变点工况作为超临界压力下划分汽水区域的标准，解决了超临界压力下水与蒸汽的相变点问题。

Especially, the stochastic variable was introduced to the model to represent the phenomena of the stochastic extinction and recolony of the cocal population, that is one of the typical feature of the metapopulation.

这是一个离散的动力系统。利用动力系统稳定性和数值分析的方法，分析了种群变化的动态规律及其原因。其次，通过引进随机变量，很好地描述局域种群的灭绝和繁殖的随机现象。

How to calculate the sum of P-series by Fourier series ;2. Fourier series was utilized to fit the stress and strain of tire in a rolling cycle by means of mechanic-field analytic result.

利用轮胎力学场的数值分析结果，采用傅立叶级数拟合单元在轮胎滚动一周内的应力-应变变化，并根据拟合后的傅立叶系数计算轮胎单元损耗应变能和生热率，分析了轮胎在不同速度时的温度场。

Computing the trajectory of a spacecraft requires the accurate numerical solution of a system of ordinary differential equations .

的总体目标数值分析领域中的设计与分析技术，以提供准确的近似，但很难解决的问题，不同的是所提出以下。

Combined with self-organized theory of cell ular automata and elasto - plastic theory, the elasto-plastic cell ular automata updating rule is presented.

将细胞自动机的自组织理论与弹塑性理论相结合，推导了分析平面塑性问题的细胞自动机更新规则，采用Weibull随机分布模拟岩石类材料的非均质性，元胞单元服从简单的本构关系和一定的强度准则，建立平面弹塑性细胞自动机模型，开发了相应的数值分析软件。

This paper computes periodic Halo orbits around L1 point in circular-restricted three bodies problem, composed of Sun-Earth-Probe, by means of numerical analytical method, and researchs the feature of these Halo orbits.

利用数值分析方法，找到了日－地－探测器三者构成的圆限制性三体问题中L1点附近的周期晕轨道，分析了轨道的特性。

Based on the amount of available input information and the state of art of the geophysical signal processing, the new methods are prac tical and hopeful for serving industrial applications.

本文还用混沌理论对激励源的运动进行数值分析，通过相平面图和Poincare图分析发现，在某些激励条件下，激励源的运动形式可能是混沌的。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。