基于网络控制与组态技术的过程控制实验室改造

在介绍"THJ-3型高级过程控制系统实验装置"组成的基础上,完成了基于C/S网络控制的1拖4的实验设备的改造,组建了系统的组态环境,并在组态环境下学生能够通过网络对过程控制装置在实验室的教师服务器上进行采集和控制,系统调试运行效果良好。通过网络技术对实验室的改造可以大大提高实验室的利用率,解决了实验室设备较少的问题,同时可以让学生能更好地了解学习现代网络控制和组态技术的优点。     

基于B/S结构的过程控制网络实验系统研究

面对高校实验教学存在的众多问题,提出了实验设备网络化的思路。以学校的THJ-2高级过程控制实验设备为例,介绍了网络实验系统的结构、组成,将液位控制实验作为典型实验,说明了过程控制网络实验系统的工作过程。最后,分析了开发网络实验室的意义。     

基于三层网络控制的过程控制实验平台

设计了基于Rockwell网络架构的过程控制实验平台,阐述了实验平台的网络结构和网络功能。该实验平台除满足过程控制课程的基本教学实验外,还可进行复杂的网络控制实验,使学生在实验室里就能体验到工业网络中系统组态、数据采集和实时控制的3大功能。     

基于C/S结构的网络型过程控制实验系统开发

以实验室的THKGK过程控制实验设备为平台,介绍了以网络为基础的实验系统的总体结构和各个部分组成、设置,将液位控制实验作为典型实验,说明了过程控制网络实验系统的具体实验过程。运用MCGS、SIMATIC STEP7 V5.4等技术设计了用于实验状态监视、数据采集及处理、数据记录的监控软件,在PLC中建立了专门用于数据交换的公用数据块,并在MCGS的全局脚本中建立相应的数据交换用户程序。实验结果表明,基于以太网及现场总线的过程控制系统实验装置,解决了被控对象、测控装置等物理设备的地域分散性,以及控制与监控等任务对实时性的要求,系统具有界面友好、易于操作、运行可靠、操作简便等特点。     

基于西门子工业网络的过程控制实验系统

论文依托南京理工大学自动化学院过程控制实验室的建设,介绍了过程控制实验系统的组成,重点讲述用于实验教学的不同层次的实验,分析了这些实验的内容以及相互关系,通过系统网络结构及监控实验环节深化了西门子全集成自动化的工业网络模型。实践证明这些实验内容对促进过程控制教学、教师科研、培养学生掌握过程控制系统设计的能力等方面有着重要意义。     

基于LabVIEW平台的可配置过程控制教学实验系统

针对实验室过程控制实验教学系统学生可操作性差的不足,设计了基于Lab VIEW平台的可配置过程控制教学实验系统,首次将NI公司开发的数据采集卡NI-my DAQ应用于构建实际对象的过程控制,搭建了半物理的液位过程控制实验教学系统。利用NI-my DAQ数据采集板卡将计算机与液位实验装置相连接,利用计算机上的Lab VIEW软件平台实现了液位过程的辨识与控制器设计,并通过控制实际的液位对象来验证控制器的性能。该实验系统要求学生必须掌握"过程建模-控制器设计"一体化方法,能够提升学生对过程控制的理解,训练学生控制器设计方面的工程创新能力。     

基于NetLinx架构的过程控制实验平台的设计与实现

设计了基于NetLinx网络架构的过程控制实验平台,阐述了实验平台的网络结构和网络功能.该实验平台除满足过程控制课程的基本实验教学外,还可进行复杂的网络控制实验,使学生在实验室里就能体验到工业网络中系统组态、数据采集和实时控制的3大功能.并以基于网络的水箱液位随动控制实验为例实现了网络控制功能,获得良好的实验效果.     

《现代教育技术》开放式实验教学网上评价体系的实践探索

本文拟从实验室开放与网络平台相结合出发,学生利用课外时间在实验室利用网络平台完成实验项目,提交实验报告。教师通过网络对学生完成的实验项目进行评价,及时反馈意见。     

过程控制测量信号数字滤波方法优化

在对过程控制实验装置上某一液位测量信号分析的基础上,提出了兼顾平滑性和准确性的滤波性能指标。应用该指标分别编写了查询一阶惯性滤波法、中位值滤波法和平均值滤波法的最佳滤波参数程序。通过对3种方法最佳滤波参数的分析,确定了一阶惯性滤波法更适合过程控制实验装置的这一液位信号,该方法的实验室装置应用效果也证明了其有效性。     

基于PROFIBUS-DP现场总线的过程控制实验平台

对自动化技术实验室原有的控制系统进行了改革,采用西门子工业自动化产品开发了基于PROFIBUS-DP的过程控制实验平台。经过改造的控制系统实现了对实验装置的集中管理、分散控制。实践表明,该平台提高了实验效率,有利于学生了解目前先进的控制技术,是掌握PLC应用技术、学习过程控制工程、研究控制算法的良好平台。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.