构建和谐高效的世博会客运交通体系——中国2010年上海世博会园区客运交通规划研究

上海世博会客流的特点是:客流量大,高峰日明显;客流集中,流向单一;客流组成复杂;越江客流量大;园区内部客流交通需求旺盛.上海世博会客运交通规划应建立多模式的综合交通体系,增强系统的交通能力,并加强政策调控措施.     

起爆装置对聚能杆式射流成型影响的数值模拟研究

为研究VESF板对聚能杆式射流成型的影响,利用非线性动力学分析软件AUTODYN-2D分别就VESF板的材料与形状对侵彻体成型的影响进行数值模拟。结果表明:板形状为K字形、长方形、三角形时,产生最佳爆轰波形所对应的VESF板材料分别为钨、铜和钢;三角形的VESF板产生的爆轰波形最佳,形成的射流速度较高,形态较好。通过调整VESF板的材料与形状可达到调整装药起爆方式的目的。     

制导系统精度分析及误差分配方法

研究了一种新的方法流程,针对非线性导弹模型,选用蒙特卡罗方法,对影响精度的各类误差源分类,并进行脱靶量仿真。提出基准弹道概念,按照瑞利准则分析指标要求的精度;根据误差源的控制难度和它们对脱靶量的影响,以及自身的变化灵敏度,合理分配误差指标;仿真结果表明:该方法可以确定影响制导性能的主要误差来源,合理分配各环节的设计指标;它为设计过程中改进制导性能和落实合理的工程指标提供理论依据,是研制过程中一个科学的方法流程。     

A Moisture Transfer Model for Isothermal Drying of Plant Cellular Materials Based on the Pore Network Approach

Plant materials with cellular structure, like fruits and vegetables, are often viewed as porous media in terms of model building of the drying process, on the basis of a hypothesis that all of the moisture of a plant tissue is trapped in a continuous and connected pore network system. However, most of the moisture in the plant tissue is contained naturally in enclosed cells. In the course of drying, the trapped moisture has to cross the cell membranes and then migrates in the extracellular space. Based on this concept, a pore network model for isothermal drying of plant materials was developed in which two stages of moisture movement—transmembrane transfer and extracellular transfer in the pore network—were considered. Finally, the isothermal convective air-drying processes of a potato slice were simulated. The calculated results were validated by the experiments conducted under the simulation conditions.     

深井重复采动底板回采巷道稳定控制技术研究

针对近距离煤层回采后底部煤层回采巷道稳定性问题,以6128工作面为研究对象,采用理论分析、数值模拟和现场观测综合研究方法,分析了其回采结束后下伏14 m处6127工作面轨道平巷的稳定性问题,并设计了巷道的支护形式,取得了显著地经济技术效果,为类似开采条件下的矿井提供了一定的借鉴意义。     

Experimentelle und numerische Untersuchungen von Brandszenarien vor Fassaden unter Berücksichtigung verschiedener Abstände

Experimental and numerical investigations of fire scenarios in front of façades considering various distances Constructional boundary conditions, e. g. walls or façades, close to ignition sources affect the fire formation and the plume. It is already known, that boundaries (e. g. walls) constrain the entrainment of air and oxygen into the plume and the combustion of gas or flammable products is completed at larger heights. How far the location of the fire sources, the building geometry and the heat release rate affect the characteristics of a flame is investigated at the Institut für Baustoffe, Massivbau und Brandschutz (iBMB) of TU Braunschweig in line with a series of experiments with a square gas burner. For the implementation of the fire tests the test rig in Braunschweig is provided with extensive measurement techniques to determine heat flux, wall‐bounded temperatures, temperatures for plume measurements and upward velocity. In this paper the data of the fire tests are discussed and compared with the results of a CFD‐Model and selected empirical calculation approaches.     

基于3DS MAX的铁路客运站旅客出站诱导设计模拟与评价

本文采用层次分析法建立了旅客诱导评价模型,通过模拟实验,分别对汉口火车站现状和设计方案进行了评价,为铁路客运站诱导设计方案评价提出了一种新的方法。     

发动机冷却系统中流动与传热问题数值模拟进展

着重论述利用数值模拟技术研究发动机冷却系统中流动与传热问题的发展现状,包括水套单相流及气液两相流流动、流－固耦合传热、一维与三维联合模拟等该研究领域的热点内容。耦合系统之间联合分析的方法准确反映了发动机各部件之间的影响关系,这种分析方法是目前研究的重点,但其中仍存在一些问题。基于此状况提出改进办法：针对不同工况选用循环平均参数作为燃气侧传热边界条件;水套进出口的流动边界条件,在稳态工况下设为定值,在过渡工况下通过循环一维仿真计算确定;应采用整体耦合方法进行计算,计算模型应尽量完整,但可以进行适当的简化,并总结出模型简化的原则。     

地下车库诱导式通风与风管式通风系统的数值模拟分析

诱导式通风和风管式通风作为2种常用的通风系统,在地下车库通风设计中得到了广泛的应用.本文以某地下车库为载体,首先对诱导式通风系统和风管式通风系统进行了数值模拟计算.而后从气流组织、污染物浓度分布和经济性方面对2种通风方式进行分析评价,得出诱导式通风系统在气流分布方面虽不如风管式通风系统均匀,扰动较大,但有利于污染物的排放;同时,该系统运行经济,节省费用可观,综合考虑可知诱导式通风系统拥有较大的优势,具有很好的推广前景.