数值计算

In the meantime, the temperature of the bus under natural cooling condition is computed by numerical calculation. If the temperature does not meet the requirement, the two schemes of forced ventilation are posed and compared. At last, the ventilating fan is selected on the basis of analysis.

针对垂直布置的母线进行了详细分析，建立了垂直布置的母线的传热模型，确定了计算母线壳体温度和导体温度的数值计算方法，并根据所得结果提出了在工程应用中可以采用的垂直布置的母线散通风方案。

At the beginning of the thesis, the structure of usually used radome is introduced and the parameters of electromagntic characters are described in Chapter Ⅰ; the different methods for analysis of the electromagnetic characters of radome are summarized in Chapter Ⅱ; the propagation of 3-D beam in free space is conducted in Chapter Ⅲ; then in Chapter Ⅳ, the 3-D Complex Ray Theory are analyzed and the characters of transmitted field of sum and difference beams through radome are studied, and the relative formulations of calculation are rekened; at last the electromagnetic characters of the ellipsoidal sandwich radome and the plane single-layered radome are discussed, and suggestions for optimization of electromagnetic properties of radome are given.

本文第一章介绍了常用雷达罩的结构和描述雷达罩电磁特性的参量，第二章概述了目前分析雷达罩电磁特性所采用的各种方法，第三章分析了三维波束在自由空间传输特性，第四章研究了三维复射线理论，并应用它分析了单脉冲和差波束穿过雷达罩透射场的特性，导出了有关计算公式，在第五章，通过大量的数值计算和实验研究，讨论了椭球形三层夹心状实用雷达罩和单层介质平板模拟雷达罩的电磁特性，并提供了雷达罩电气特性优化的建议。

The double sublimation front model was simulated numerically with variable time-step finite volume method. This study mainly concentrates on the influences of control parameters, such as loss factor, initial saturation and electric field strength, on microwave freeze-drying. A comparison of the numerical results was done for different porous structure form as well.

对包括电介质损耗系数、物料的初始饱和度及电场强度等在内的变工况下非饱和含湿多孔介质微波冷冻干燥过程进行了计算，分析了各个参数对干燥过程的不同影响，同时对不同坐标系下的数值计算结果进行了比较。

Therefore, the choice of single mode in the examination and the frequency-thick band of mode has been given a particular illumination separately in the paper, following a relative numerical simulation. And a multi-cyclical sine signal modulated by Hanning window is used to simulate the excitation wave, and then an inspected ring of nodes is established to receive the echo, finally how the length of the circumferential cracks, the width of the axial cracks and the degree of the thickness-reduce effect the result is explained through the analysis of the result, further more, the reflection factor in the defect has been calculated.

因此，本文也就单一检测模态的选择以及模态频厚积段的选择分别予以了阐述，并有针对性的进行了数值计算：应用Hanning窗调制的多周期正弦波模拟单音频激励信号，并设置监测质点环接收回波，通过分析说明了管道的周向裂纹、轴向裂纹以及点蚀缺陷对缺陷回波所产生的影响，并进一步计算了缺陷处的反射系数。

Numerical calculation method is used to solve some relative problems such as curve's length and so on during interpolating.

应用数值计算方法解决了插补过程中曲线长度等的相关计算问题。

Methods of fast Fourier transform and phase unwrap were used to demodulate the phase of the interferogram obtained from experiment, distortion of wavefront disturbed by temperature fluctuation which equals to phase shift induced by refractive index change was calculated, and a way of axisymmetric temperature field reconstruction was put into reshowing a layer of the gas temperature distribution.

通过实验得到干涉条纹，用CCD摄入计算机，经Matlab编制傅里叶变换、相位去包裹和其他数值计算程序，解调干涉条纹的相位，计算出温度扰动产生的波面畸变量，它等于折射率变化引起的相位偏移值，用轴对称气体温度场重建方法，再现了气体温度场一个层面上的温度分布。

The fiber are successfully used in the practical noise control. The model of aerodynamics in the course of the intermittence exhaust is simplified into exhaust problem of two stage series cylinder. Digital calculation program which can really imitate aerodynamics characteristics in the exhaust process is established. A simple formula which can be used for calculating the volume of the silencer expansion chamber is established.

作者指出间歇性排气过程的空气动力模型可简化为两级气缸串联的排气问题，编制的数值计算程序真实地模拟了排气过程中的空气动力学特性，建立了消声器膨胀消声室体积大小计算的表达式。

In this paper, a twodimensional and a quasi-three-dimensional procedure are developed and used to analyze the steam flow field and heat transfer behavior. The basic principles for the rational arrangement of tube bundle are drawn on the basis of a large amount of calculations and analysis. Some proposals for the modification of typical condensers are presented.

本文发展了汽相流动与传热特性的二维与准三维数值计算方法和程序，并用来分析凝汽器汽相流动与传热的基本特点和规律，在大量计算与分析的基础上，总结出管束合理布置的基本准则，并对典型的管束模块提出了改进建议。

When the expressions are used in computation of grounding transient, the expense of time will be shorten by a lot compar...

推导结果可以直接用于接地系统的数值计算。此方法将大大提高地网接地特性的计算效率。

In this paper the transients are calculated and analysed by means of the numerical computation method for pulse operation,four-engine parallel operation and variable-thrust operation of the liquid bipropellant attitude control engine.

本文用数值计算的方法对双组元液体推进剂姿态控制发动机的脉冲工作，四机并联工作，变推力工作的瞬变过程作了计算分析。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新