Research of the Visualization Temperature Field of the Communication Room Based on the Reconstruction of Three- dimensional Temperature Field

Whether the temperature of the communication room is high or not is the precondition of the fact that the servers in the cabinets work normally.The traditional method to control temperature is"equilibrium refrigeration",which is high energy consumption and low efficiency.In order to solve such problems,the visualization system of the three-dimensional temperature field of the communication room based on calculation of the reconstruction of the three-dimensional temperature field by collecting the temperatures of the discrete points and on using specific data fitting algorithm is presented.The system uses Direct3D graphics library and designs under the frame of VB.NET,which could monitor the temperature of the communication room in real time and provide visual basis for the effective thermal management in the communication room.

Research on Visualization in Scientific Computation of Grinding Temperature Field

The paper introduces the concepts, classification and method of visualization in scientific computation. Visual C++ developing tool is used to compute surface grinding forces and grinding temperature field models. The three-dimensional entity model of workpiece is made with OpenGL tool, and the different colors on the workpiece entity show different value of temperature, so the visualization of grinding temperature field is realized. The temperature value of every points in grinding temperature field, the curves on surface temperature field and along depth direction are all given. The paper introduces method of visualization in scientific computation, and applies the visualization in scientific computation to the visualization of grinding temperature field. The displaying entity model of workpiece is made with OpenGL tool. The workpiece model is divided into griddings. The heat model is chosen and numerically computed, so the temperature values of every points can be attained. Three different view classes are used to display temperature data, temperature curves on the surface and along the depth direction, and the visualization distribution of three-dimensional temperature field. The visualization of grinding temperature is realized, and the display results of grinding temperature field can be dynamically changed by changing input parameters. Thus, a new path for researching grinding temperature field is developed.

VISUALIZATION OF THREE-DIMENSIONAL DATA FIELD AND ITS APPLICATION IN MACHINE TESTING

In order to realize visualization of three-dimensional data field （TDDF） in instrument, two methods of visualization of TDDF and the usual manner of quick graphic and image processing are analyzed. And how to use OpenGL technique and the characteristic of analyzed data to construct a TDDF, the ways of reality processing and interactive processing are described. Then the medium geometric element and a related realistic model are constructed by means of the first algorithm. Models obtained for attaching the third dimension in three-dimensional data field are presented. An example for TDDF realization of machine measuring is provided. The analysis of resultant graphic indicates that the three-dimensional graphics built by the method developed is featured by good reality, fast processing and strong interaction

Study on visualization simulation of temperature distributions in surrounding rock of tunnels in a deep mine

Based on the mathematical model for rock temperature distribution in a geo-thermal field,the properties of rock temperature distribution in geothermal field for fourkinds of surrounding rock cross-sections of tunnels in a deep mine were simulated by us-ing finite element method.It is shown that the relationship for rock temperature distributionvaried with the geothermal parameters,time and space.Namely, 2-dimensionaltime-dependent isograms clearly showed the process for rock temperature variation anddistribution in a geothermal field which has been redisplayed with visualization numericalsimulation.

Analytical prediction and field validation of transient temperature field in asphalt pavements

This work presented the development and validation of an analytical method to predict the transient temperature field in the asphalt pavement.The governing equation for heat transfer was based on heat conduction radiation and convection.An innovative time-dependent function was proposed to predict the pavement surface temperature with solar radiation and air temperature using dimensional analysis in order to simplify the complex heat exchange on the pavement surface.The parameters for the time-dependent pavement surface temperature function were obtained through the regression analysis of field measurement data.Assuming that the initial pavement temperature distribution was linear and the influence of the base course materials on the temperature of the upper asphalt layers was negligible,a close-form analytical solution of the temperature in asphalt layers was derived using Green's function.Finally,two numerical examples were presented to validate the model solutions with field temperature measurements.Analysis results show that the solution accuracy is in agreement with field data and the relative errors at a shallower depth are greater than those at a deeper one.Although the model is not sensitive to dramatic changes in climatic factors near the pavement surface,it is applicable for predicting pavement temperature field in cloudless days.

Flow Field and Temperature Field of Water-Cooling-Type Magnetic Coupling

At present, the water-cooling simulation of the water-cooled magnetic coupler is based on the water-cooled motor and the hydraulic coupler, which cannot accurately characterize the temperature distribution of the rotating watercooled coupling of the coupler. Focusing on rotating water cooling radiating, the present paper proposes simulating the water cooling temperature field as well as the flow field through the method of combining fluid-solid coupled heat transfer and MRF(Multiphase Reference Frame). In addition, taking an 800 kW magnetic coupling as an example, the paper optimizes the shape, number, cooling water inlet speed? and so on? of the cooling channel. Considering factors such as the complete machine’s temperature, and drag torque, it is proved that the cooling e ect is best when there are 36 involute curved channels and when the inlet speed is 3 m/s. Further, through experiments, the actual temperature values at six di erent positions when 50 kW and 70 kW thermal losses di er are measured. The measured values agree with the simulation results, proving the correctness of the proposed method. Further, data have been collected during the entire experimental procedure? and the variation in the coupling’s temperature is analyzed in depth, with the objective of laying a foundation for the estimation of the inner temperature rise as well as for the optimization of the structural design.

MATHEMATICAL MODEL OF MILLING TEMPERATURE AND TEMPERATURE FIELD ANALYSIS FOR THREE-DIMEN-SIONAL COMPLEX GROOVE MILLING INSERT

The mathematical model on the temperature of the waved-edge is constructedaccording to Jaeger's theory of moving solid and based on the used temperature model of the flatinsert. It is possible to forecast the milling temperature through programming. The comparableexperiments have been done between the two new three-dimension groove inserts (waved-edge insert,great edge insert) and flat fake insert. The theoretic forecast is in good agreement with theexperimental result. According to the cutting conditions, the boundary condition of finite elementanalysis on cutting temperature field is established, and the three-dimensional temperature fieldsof inserts with grooves are analyzed by FEM, so as to offer a reference basis for the design andoptimization of insert grooves.

基于Visual Environment的铝合金增材制造温度场数值模拟

为了探究工艺参数对增材制造温度场的影响,利用Visual Environment软件建立4043铝合金增材制造有限元模型,考察增材制造沉积方向、层间间隔时间和基板预热温度对温度场的影响,并通过试验验证模拟结果。结果表明,随间隔时间和增材制造层数增加,第1层中点峰值温度与谷值温度逐渐降低,反向沉积增材制造可获得更好的成形质量,合理范围内的基板预热可使成形件温度分布更均匀,可为增材成形参数优化提供参考。

基于双色PLIF的推进剂燃烧场定量测温方法

在燃烧学研究领域中,平面激光诱导荧光(PLIF)可以有效鉴别组分类型,获取火焰中微量组分的二维平面成像以及通过分子振动能级的分布测量温度。本文基于双色PLIF技术搭建PLIF测温实验系统,以推进剂燃烧作为研究对象,采用—OH基中的Q_(2)(11)与P_(1)(7)2条谱线开展双色PLIF技术测温实验,结合采集到的—OH基荧光图像,获取推进剂火焰二维温度场分布。通过火焰二维温度场分布情况与热电偶的测温结果进行对比及误差分析。对比结果表明:双色PLIF测温技术的测温误差为12.2 K,不确定度小于5%。该方法具有非接触、高灵敏度等特性,适用于稳态燃烧场温度测量。

高速飞行器热防护结构非均匀热流载荷反演方法

为准确掌握高速飞行器热防护结构服役时承担的非均匀气动热载荷,提出了一种基于共轭梯度理论的非均匀热流载荷的反演方法.以隔热瓦结构为例,开展了2类典型非均匀热流载荷下的数值仿真研究.通过引入一阶样条曲线插值表征非均匀热流的时变规律,降低了待反演参数数量.分析了反演方法的可行性以及温度测量偏差等因素对反演精度的影响.研究结果表明:非均匀热流时变规律的样条线表征方法可以将反演参数数量缩减到4个,极大地提升了反演效率;提出的反演方法可以精确反演结构非均匀热流载荷的时间和空间分布特性,对于含噪声的测量数据,该方法由于采用了插值重构的表征方法而体现出较好的抗噪性能.

基于差异冻结技术的深厚冲积层三维冻结温度场数值计算分析

为了探究人工地层冻结(artificial ground freezing, AGF)多圈管冻结壁温度场分布与发展规律,以淮北青东煤矿东风井为工程背景,利用现场实测数据和COMSOL Multiphysics软件建立三维冻结温度场数值计算模型,分析了立井井筒所在土层在差异冻结技术下的冻结温度场时空演化规律。研究结果表明:在对比分析中三圈管相较两圈管冻结扩展速度较快,相同的冻结时间下,冻结壁平均温度要低0.73~3.32℃·d^(-1),有效厚度增加0.38 m;砂土层相同冻结时间的条件下冻结壁平均温度要比黏土层低0.94~1.50℃,有效厚度增加0.21 m。冻结井筒计算范围内,径向温度场呈现出圈管之间温度低,圈管两侧温度较高的“马鞍型”分布;在土体深度方向,不同土性的土层温度梯度较为明显,具体表现为三圈管以及细砂层位温度更低,30 d左右Ⅱ层土体(三圈管砂土层)降温速率达到最大,约为1.12℃·d^(-1),首先完成土体降温阶段进入冻结壁交圈和拓展阶段,此时其他土层仍处于土体降温阶段。“长短腿”冻结管布置形式既可以提高井筒开挖的时间,缩短工期;又可以防止深部冻土入荒径过多,降低开挖难度,节约工程成本。采用差异冻结的方式,开机冻结30 d,去路盐水温度降至-30℃后维持该温度循环制冷盐水,使得该冻结工程取得了圆满成功。此研究可以为类似矿井冻结施工提供一定的参考。

基于塔克分解和声学测温的三维温度场重建

提出了一种基于塔克分解和声学测温的三维温度分布重建算法,该算法采用数值计算方法建立先验数据集,利用塔克分解提取锅炉温度场的主要特征,将声学测温与二维温度场插值相结合,重建三维温度场,提高了复杂温度场的重构精度,具有较快的重建速度。结果表明:该算法能够在10 s左右重建复杂三维温度场,相比传统声学测温可以将重建误差降低10%以上,对于先验工况外的温度场也有较强的适用性,对燃煤电厂燃烧优化和负荷调整具有一定的指导意义。

滚动轴承流场可视化模拟与检测技术研究现状

明确流体润滑介质在滚动轴承内部的流动行为,对优化润滑系统设计、提升润滑效能和延长轴承寿命等具有重要的指导价值。针对国内外学者在滚动轴承流场可视化模拟与检测方面的研究工作,从轴承类型、润滑方式、润滑介质、功能结构、新型材料、流场检测等方面对相关研究进行了梳理,介绍了喷油润滑、油气润滑、环下润滑等工况下的可视化模拟技术现状,概述了材料、结构和添加剂等对轴承润滑增效作用的研究现状,汇集了直接光学观测法、射线衰减法、粒子成像测速技术、激光诱导荧光技术等在轴承流场检测中的应用现状,以方便读者和研究人员从中了解到更多与滚动轴承流场有关的信息。

基于MATLAB和Visual C^(++)的风机流场分析的可视化研究

为提高风机可视化仿真系统可维护性和可移植性 ,采用MATLAB编写流场数据图形显示程序 ,并将其转换为动态链接库 ,作为其他程序调用图形显示程序的接口 ,使系统能独立运行。

某通信模块机箱自散热结构设计与优化分析

针对某通信模块设计机箱自散热结构,通过对机箱散热盖部分增加翅片,设计了通信模块与机箱传热的三维理论模型。首先采用SolidWorks建立三维模型导入到COMSOL传热板块中,通过对通信模块和机箱的温度场分布情况进行模拟,计算分析了在环境温度为60℃条件下矩形翅片高度、厚度、间距对散热情况的影响,结果显示当翅片高度为5 mm、厚度为1.5 mm、间距为2 mm时机箱达到最佳散热效果。

基于正则化SVD算法的660MW机组煤粉加热炉炉膛三维温度场重建

针对现有加热炉炉膛内三维温度场重建方法存在的重建误差较大、重建消耗时间较长的问题,提出基于正则化SVD算法的660MW机组煤粉加热炉炉膛三维温度场重建方法。根据人眼视觉二维图像特征点提取原理,提取温度场立体图像特征点;利用小波变换方法计算子线段端点,获取特征点匹配结果;通过声学测温方法以及射线成像理论,重建声波传播速度分布形式,凭借正则化SVD算法构建声学测量系统模型,对声波飞行值进行修正,结合特征点匹配结果和对称轴,得到实现660MW机组煤粉加热炉炉膛三维温度场重建。实验结果表明,所提方法的最低AER、MER、RMSE分别为4.11、0.98、1.21,重建时间始终保持在0.6s以内,重建误差较小、重建消耗时间较短,抗噪声能力强,温度场重建效果好。

基于cGAN的工业加热炉温度场预测方法

工业加热炉燃烧过程不稳定,可能会在随机位置出现局部超温,导致炉管损耗和破坏。由于加热炉设备庞大,难以对有关物理量进行在线测量,为此,文章提出在标准工业炉加热炉模型上建立基于条件生成对抗网络的数字孪生模型,通过该模型预测加热炉温度场,并利用Unity3D软件实现可视化,帮助工作人员进行燃烧优化。实验结果表明,cGAN网络架构能够完成温度场预测的工作,在测试集上约80%的节点计算得到的温度绝对误差值在炉内最高温度的1%以下,具有良好的应用前景。

富水砂层斜井明挖段三维冻结温度场时空演化规律研究

为解决冻结斜井明挖段施工过程中,斜井冻结温度场难以准确预测导致开挖时间及速度无法确定的工程难题,以升富煤矿冻结斜井明挖段为研究对象,基于实测地层特性及冻结孔布置参数,采用COMSOL Multiphysics有限元软件,构建三维冻结温度场数值计算模型,对冻结斜井明挖段施工期间温度场的时空演化规律进行数值计算预测分析。计算结果表明:在相同冻结时间条件下,细砂层冻结壁平均温度比中砂层低0.28~2.39℃,细砂层冻结壁有效厚度比中砂层厚0.36~0.59 m。在持续冻结88 d后,明挖段冻结壁平均温度低于-12℃,且不同层位的侧帮冻结壁厚度均能达到4 m以上,底板处的冻结壁厚度均达到5 m以上,满足设计开挖需求。在开挖期间,井帮位置暴露的土体存在“热流侵蚀”现象,但在快速开挖施工的条件下,冻结壁的有效厚度并未减小且冻结壁平均温度仍处于-10℃以下,因此开挖过程中不会发生大范围的冻结壁“软化”现象。基于预测结果,制定了现场开挖方案,由现场实测数据可知,在开挖过程中测点及井帮温度出现轻微波动,但整体温度发展趋势较为稳定,表明施工期间冻结壁是安全稳定的。研究成果可为斜井冻结法凿井的安全施工及优化设计提供参考。

大跨度斜拉桥钢-混组合梁一维日照温度场高效数值模型构建及试验验证

由于内部材料的分层,钢-混组合梁整体竖向温度梯度分布不均匀,温度场求解困难且模拟精度和效率不理想。该文以傅里叶热传导定律为理论基础,推导了钢-混组合梁的一维日照温度场数值计算通用模型,采用逐次超松弛迭代法进行求解;通过一个钢-混组合梁数值案例,对比分析了该方法与COMSOL的计算精度和效率;基于某大跨度斜拉桥的温度健康监测数据,验证了该方法对于日温度时程和全截面竖向温度梯度仿真的精度,并将竖向温度梯度的仿真结果与我国桥梁规范进行了对比。结果表明:该方法计算精度与物理场仿真软件保持一致,计算效率提升了78.3%,并能准确模拟大跨度斜拉桥钢-混组合梁的竖向温度分布,为大跨度斜拉桥钢-混组合梁温度效应的计算提供了强有力工具。

基于Visual Basic的钢筋混凝土柱火灾下温度场的ANSYS参数化分析

基于Visual Basic及ANSYS提供的二次开发工具APDL,开发了界面友好的火灾下钢筋混凝土柱温度场数值分析系统。借助Visual Basic前台开发友好、方便、易用的人机交互界面,对复杂、难于理解和掌握的ANSYS命令流进行后台封装,能够大大提高钢筋混凝土柱温度场分析效率。