数值方程

Analyzing on the fault of local rubbing caused by compatible misalignment of rotors, a dynamic model for the rotor system with misalignment and rub-impact was established. Then the dynamic behaviors of this system, which varied with the values of parallel misalignment and declination, were investigated by using numerical integral method.

以水轮发电机组转子系统为研究对象，针对刚性联轴器综合不对中引起转子局部碰摩的问题，建立了机组转子不对中–碰摩耦合故障的动力学模型和微分方程，并利用数值积分方法研究该系统随不对中平行量和偏角参数变化的动力学行为。

It is deduced in this paper theoretically the elastic wave equation in two dimen-sional EDA media, for which numerical modeling is carried out.

中文摘要：本文从理论上推导了二维EDA介质中的弹性波动方程，并对其进行了数值模拟，获得了当坐标系旋转30°时用点源激发的三分量波场切片及用相互正交的横波震源在同一位置激发，用两个相互正交的水平检波器接收的四分量全成记录。

Derivative security ; price equation ; numerical analysis ; stock option

衍生证券；定价方程；数值分析；股票期权

In this dissertation, based on the beam propagation equation in the free-space, the hyperbolic-fit mothed is used to calculate the M2- factor of Gaussian beams passing through a spherically aberrated lens for the first time.

本论文根据自由空间中光束的传输方程，利用多点拟合的方法，通过数值计算，首次研究了激光束通过球差透镜后的M~2因子随球差的变化规律，并用M~2因子、桶中功率和K参数作为光束质量评价参数，讨论了透镜的像差、遮拦比等对激光光束质量的影响。

The applications of modified Jameson's scheme to the complex flow around the missiles with canards and tails, result in good agreement between computations and experiment data of the standard missile model of U.S.A..

将改进的Jameson格式应用到多翼导弹的三维流场计算中，并使用分区技术和三维椭圆微分方程数值网格生成技术以精确模拟此复杂构形的复杂流态，计算结果与美国导弹标模的实验吻合很好。

ABSTRACT Theoretical analysis of the feed pipe inflow of self-excited pulsating and cavitating jet is given on the basis of fluid transient...

利用流体瞬变流和水声学理论分析了自激振荡气蚀射流喷管内的流动规律，建立了喷管内水声学特性的特征方程，并给出了数值解。

Numerical calculations are performed by the standard K-εmodel and dynamic mesh capability on vehicles being in crosswinds, running in tunnel, passing by and overtaking each other. Their aerodynamic characteristics are analyzed and some different turbulence properties are obtained.

本文对Fluent进行二次开发，采用动网格技术及标准K -ε两方程湍流模型对类车体在侧风情况、穿越隧道及超车、交会过程进行三维非定常数值模拟，获得了规律性的认识。

This current is extra high and exceeds the permitted value of 10 % error curve of protection current transformer.It will affect the performance of relevant protection equipment.

文中以n次曲线模拟TA铁心饱和时的非线性磁化曲线，由此导出TA回路的非线性微分方程，并采用数值方法计算出在典型暂态短路电流作用下的TA二次电流波形。

In this paper,N-S equations with primitive variables are solved by finite vol-ume method to study flow field around train.

本文采用有限体积法求解具有原始变量的低速N一S方程，对列车周围流场进行数值模拟研究。

A theoretical analysis of local damage in a thin ductile tube hit by a flat-nosed missile laterally is developed to predict local failure due to plugging by the beam-on-foundation model. The effect of internal press was considered, and differential equations was obtained which can predict the ballistic speed of the missile which impact the tube filled with water. It can be solved by Runge-Kutta method.

采用地基梁模型对平头弹体侧向冲击钢管的冲塞型破坏模式进行了理论分析，考虑了充压情形下内压的影响，导出了钢管在冲击过程中的运动方程，可以用龙格—库塔法进行数值求解来确定弹体冲击充液压力管道的弹道极限速度。

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。