共查询到20条相似文献，搜索用时 984 毫秒
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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。 相似文献
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基于B/S结构的过程控制网络实验系统研究 总被引：1，自引：0，他引：1
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。 相似文献
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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。 相似文献
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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。 相似文献
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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。 相似文献
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《实验室研究与探索》2015,(12):97-100
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。 相似文献
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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。 相似文献
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《实验室研究与探索》2016,(4):26-29
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。 相似文献
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基于PROFIBUS-DP现场总线的过程控制实验平台 总被引：2，自引：2，他引：0
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。 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
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? 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献