数值分析

Thus LES is proved to be suitable to simulate the flow and temperature fields of large scale vortices with complex geometric boundaries. LES cooperated with the second order full extension ETG finite element method is applied to simulate the forced convection heat transfer around two square cylinders arranged side by side. While the boundary conditions are symmetrical, the time history and power spectrums of drag coefficient, lift coefficient, averaged Nusselt number at the wall, and the streamwise velocity and temperature on the symmetrical points are calculated. The results show that the power spectrums are all almost symmetrical.

应用大涡模拟与二阶全展开ETG有限元离散格式相结合的方法对间距比为1.5的条件下横掠并列双方柱强制对流换热问题进行了数值模拟，通过边界条件对称时，对并列双方柱对称点上的速度和温度以及方柱的阻力系数、升力系数和壁面平均Nu数进行的时域分析和频域分析，得到了在对称边界条件下并列双方柱对称点上的速度和温度以及方柱的阻力系数、升力系数和壁面平均Nu数的功率谱均基本对称的结论。

Several parameters for the fire resistance on cross section of a reinforced concrete T-beam exposed to the ISO834 standard fire are analyzed,including the fire time and the ration of load.

结合国内外建筑结构火灾试验，引入开裂准测和非线性本构关系，提出了火灾下结构有限元分析思路，利用数值模拟程序分析了火灾高温下钢筋混凝土T梁截面的温度分布，研究了火灾时间、荷载比对ISO834标准火灾升温过程下钢筋混凝土T梁桥挠度的时变效应规律及开裂状况。

On the basis of theoretical analysis of digital holography, the preliminary study carries out through computer simulation and experiments. The main work is as follows:Firstly, on the basis of off-axis Fresnel diffraction, the principles of optical holography and digital holography are introduced. Besides, the theories such as recording digital hologram, numerical reconstruction and the related digital image processing methods are analyzed.

本论文从理论分析、计算机仿真和实验三个方面对数字全息技术进行了初步的研究，主要完成了以下工作：首先，介绍了传统的光学全息术和数字全息技术的基本原理，以离轴菲涅耳全息为例对数字全息的记录条件、数值重现算法、以及相关的数字图像处理方法进行了详尽的理论分析。

A Gaussian beam is expanded intothe sum over a set of plane waves with the aid of the plane-wave spectrumtechnique.

文中应用电磁散射理论重点分析亚毫米高斯波通过金属栅网的散射特性，通过数值计算、仿真及实验测量分析金属栅网的近场散射特性。

According to generating finite element model by meshing for special-shaped section columns, a computer program using the digital iteration method for full range analysis of special-shaped columns is complied. By the analytical results,"M-φ" related curves are obtained, at the same time, differences of ductile behavior, and bearing capacity are analyzed.

通过异形柱截面的有限元单元网格划分，用数值方法编制了计算机分析程序，通过计算，可以得到以上各种截面柱的弯矩—曲率关系曲线，分析它们在延性和承载力等性能方面的差异。

Numerical simulation proves that the proposed method is more accurate than conventional harmonic analysis method.

数值模拟试验表明，在适当选取点质量埋深度的情况下，本文的点质量调和分析方法较传统的调和分析方法精度更高。

According to in-situ construction real time observation and inverse analysis results, refinement numerical artificial analysis on a group of headrace tunnels was conducted and influence of different construction schemes and support parameters on rock mass deformation and failure behavior were researched to provide quantized data and technical aid for project construction decisions.

基于跟踪施工的现场实时观测和反演分析结果，对引水发电洞群进行了精细化数值仿真分析，研究了不同施工方案和支护参数对岩体变形、破坏特性的影响，以便为工程的施工决策提供量化资料和技术支持。

The buckling numerical analysis was made to the rod which is hinge joint and uniform cross section under the axial dynamic loading,basing on the finite element theory.

阐述了动力屈曲分析的Ansys/Ls-dyna有限元理论，基于该有限元程序对两端铰接、等截面直杆在轴向动力载荷作用下的屈曲过程进行了数值模拟和分析。

To investigate vertical competition in the two-echelon serial supply chain, a M/M/1 queue model is established, the efficiency, firms'decision variables and the customer service level between centralized and decentralized control are compared; a supply chain horizontal competition model is established, the impacts of horizontal competition on performance of the supply chain are analyzed by using theoretical and numerical methods.

针对两级串联供应链中的垂直竞争问题，建立了M／M／1排队模型，对集中控制与分散控制下，供应链的效率、厂商的决策变量和用户服务水平进行了比较分析；建立了供应链水平竞争模型，采用理论分析和数值计算方法，研究了水平竞争对供应链绩效的影响。

Furthermore, stress, horizontal displacement and deflection of bridge structure are analyzed.

摘要］ 针对多跨连续刚构桥悬臂长度长、悬臂梁体重、施工荷载大等特点，结合重庆朝阳寺特大桥实际情况，通过理论分析和有限元数值模拟，对中跨、次中跨、边跨不同合拢顺序下，所需顶推力和顶推位移进行计算，并对桥梁结构的应力、水平位移及挠度进行了比选分析，提出并论证了采用计算预推值时先中跨再次边跨最后边跨的合拢方案，其突出优点是边跨合拢施工以挂篮和导梁代替搭设支架施工，措施简单易行、安全可靠。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。