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温湿度控制器，用于某些设备的液压机构中，要求该温湿度控制器能长期连续稳定运行。以保证设备正常运行。本文设计的温湿度控制器可保证温度、湿度满足设计要求，可现场控制。 相似文献
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电炉温度控制系统的研制 总被引：2，自引：1，他引：2
陈嘉艳 《实验室研究与探索》2002,21(5):78-80
提出一种电炉温度自动控制系统的软、硬件设计方法，该温度控制系统由可编程序控制器（PLC）控制，具有达到稳定温度时间短，稳定精度高等特点。 相似文献
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白乃平 《杨凌职业技术学院学报》2009,8(1):15-18
设计了基于可编程控制器（PLC）的轧机电气控制系统,反馈单元应用高精度光电编码器作为速度传感器,采用矢量控制的变频调速方式控制主传动电机和辊道电机转度,以PLC为主控制单元使得辊道转速和主传动电机速度完全一致。实践表明,设计的整套系统具有良好的调节品质,稳定可靠的性能,并且维护简单。 相似文献
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依据步进电动机的工作原理以及控制方法,提出了步进电动机控制系统的设计方案。使用西门子CPU224可编程控制器作为核心控制器设计出步进电动机控制系统,可以实现对三相步进电动机速度、正反转、三相单三拍、三相六拍等多种运方式的控制。给出控制系统软硬件的实现方法,整个控制系统结构简单,功能较强,可靠性高。 相似文献
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文章针对小型网络服务器应用的现状,设计了简易的小型网络服务器主机开关机控制系统,用于实现服务器主机开关机定时控制。该系统具有电路简单、成本低、实现容易等特点。经试验,该控制器能对服务器主机开关机实现可靠控制。 相似文献
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随着工业控制技术的进步，可编程序控制器已广泛地应用于工业生产过程自动控制领域，本文介绍了《可编程序控制器实验》选修课程中，几个具有实际应用价值的实验内容以及相关模型，诸如音乐喷泉控制系统、温度控制系统、小车定位控制系统等，极大地调动了学生实验的兴趣，激发了学生的积极性和创造性，收到了满意的实验教学效果。 相似文献
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文章首先对智能制造系统以及可编程控制器的基本知识作了简单的介绍,然后提出在制造过程中的智能监视和控制系统中应用PLC控制器,最后证明应用PLC控制器对其进行智能监视和控制具有巨大的优势和发展前景。 相似文献
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根据十字路口交通灯控制系统的要求,选用西门子CPU224可编程控制器作为十字路口交通灯系统的控制器,应用顺控法编程思想设计出控制系统的顺序功能图,利用顺控继电器指令把顺序功能图转换为梯形图程序,设计出系统的硬件.控制系统硬件结构简单,主要控制功能通过顺控编程方法来实现.具有可靠性高、易于维护和扩展的特点.整个系统在试验台上进行了验证和调试.系统运行良好,满足了控制要求. 相似文献
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欧金荣 《化工职业技术教育》2006,(4)
分析了空压机原联动控制系统的运行特点、存在的缺陷,对系统进行改造,利用自制电子式两位差动可调控制器取代压力控制器,克服其缺点,改造后系统具有检测、控制、显示、报警、保护等功能,运行时参数调整方便、直观,性能稳定可靠。 相似文献
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《海外英语》2007,(4):36
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. 相似文献
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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. 相似文献
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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. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Rajesh Kanoi 《海外英语》2007,(1):52
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. 相似文献
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正A One day a pig went to the stable(马棚)to see his good friend,an oldhorse,and was going to stay there forthenight.Night came and it was time forsleep.The pig went into the straw heap(稻草堆)and lay comfortably.A longtime passed,but the horse was stillstanding there and did not move.Thepig asked the horse why he did not go tosleep."Standing like this is the begin-ning ofsleeping,"answered the horse. 相似文献
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《今日中学生》2014,(9)
正1.Any fool can count the seeds in an apple.Only God can count all the apples in one seed.2.Happy families are all alike;every unhappy family is unhappy in its own way.3.Memories are the key not to the past,but to the future.4.Sometimes in the dark you see what you want to see.5.There is a great difference between 相似文献
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《重庆大学学报(英文版)》2014,(2)
正Scope and Policy The Journal of Chongqing University-English Edition(JCQU-E)is a peerreviewed journal publishing research articles in multiple disciplines of science and technology,covering civil and environmental engineering,chemical engineering,biotechnology,mechanical and electrical engineering,computer and data processing,mining,metallurgy,materials science,and interdisciplines thereof. 相似文献