高职院校《电机与电气控制技术》课程实训的改革探索

《电机与电气控制技术》课程实训,是指导学生所做的验证性实验,通过联接一些简单的控制电路或是到工厂参观一些电气设备,学生的实践及动手能力得不到培养、锻炼和提高。作者在近几年指导《电机与电气控制技术》课程的实训过程中做一些改革尝试,得到一些体验,供大家一起探索、思考。     

高职院校《电机与电气控制技术》课程实训的改革探索

<电机与电气控制技术>课程实训,是指导学生所做的验证性实验,通过联接一些简单的控制电路或是到工厂参观一些电气设备,学生的实践及动手能力得不到培养、锻炼和提高.作者在近几年指导<电机与电气控制技术>课程的实训过程中做一些改革尝试,得到一些体验,供大家一起探索、思考.     

电气控制设计中电动机和常用低压电器的选择

电气控制电路设计能力是从事工厂电气设计、电气设备维修工作人员应具备的基本能力。电动机和低压电器的选择是电气控制设计中极其重要的环节,它直接影响后续电气电路的性能和安全。通过探讨如何选择三相异步电动机和常用低压电器,对电气设计和电气设备维护提供了主要依据。     

应用可编程序控制器改造C650车床

老式的电气控制系统采用继电器——接触器控制,这种控制系统布线复杂,故障率高,不易查找维修。作者利用日本三菱公司的可编程序控制器在普通车床改造中进行应用,对车床电气控制的软硬件重新进行了改造设计。通过验证采用先进的可编程序控制器控制取代传统的继电器控制使普通车床的可靠性和性能以及效率大为提高。     

《电机与电气控制技术》中案例教学法的应用

《电机与电气控制技术》是中职学校电子电工专业核心课程,具有较强的实践性,可采用案例教学法,提高学生的学习兴趣,锻炼学生的操作能力,提高教学质量。本文选择《电机与电气控制技术》中"继电器——接触器控制系统"一章,详细说明了教学案例引入方法、案例教学法在理论教学和实践教学中的应用。     

浅谈教学电梯多项实践训练项目的开发

教学电梯经过技术改造后,能实现电梯电气控制线路拆装实践训练,电梯故障排查实践训练,电梯程序设计输入、调试实践训练,为提高电梯专业课实践教学质量提供重要保证。     

基于单片机的ZPW-2000轨道电路故障诊断系统设计

为了提高铁路信号工快速定位故障、判明原因并修复故障的能力,设计研发了一套新型ZPW-2000轨道电路故障诊断系统。该系统通过RS-232串口和相关通讯协议完成PC机与单片机的通信,基于单片机控制电子继电器来实现电路的通断,进而模拟故障现象。实验表明,该系统可以实现ZPW-2000轨道电路故障模拟的集中控制和集中显示,能极大地提高故障设置以及检测修复的效率,而且可以使用户快速地掌握电路故障点的定位与修复方法。     

基于Unity3D的恒压供水虚拟实训教学装置开发

针对高校电气控制课程实训平台数量不足、实训内容简易匮乏和学生工程实践能力差等问题,选择生活中较为典型的恒压供水系统作为教学载体,设计了恒压供水虚拟实训装置。系统采用3ds Max建立水泵、压力传感器、水池等三维模型,利用Unity 3D开发恒压供水上位机虚拟仿真软件,以PLC、变频器和继电器等搭建硬件控制电路作为下位机,上位机仿真软件和下位机硬件控制电路通过通信接口模块连接交换数据,实现了融合虚拟场景和硬件控制电路的虚拟实训装置的开发。结果表明,虚拟实训装置能够有效降低实训设备成本,弥补实验设备数量不足,充实实训内容,提升学生工程实践能力。     

汽车电气设备的实践教学探讨

通过加强对学生思维能力的培养,鼓励创新,提倡向同学开放实验室,尝试开设设计性实验,同时采取措施健全汽车电气设备课程考核方法,使汽车电气设备的实践教学适应汽车电气实验的教学特点,从而多方面促进学生能力的培养,提高汽车电气设备的实践教学效果.     

基于概率神经网络的SF6电气设备故障诊断

SF6电气设备存在放电故障时,内部的sF6气体会分解成诸多衍生物,对设备的安全运行造成隐患．因此,通过SF6衍生物的状态可以推断设备的放电故障．在已有实验数据的基础上,将SF6衍生物的状态作为神经网络的输入,放电故障作为神经网络的输出,构建了基于概率神经网络的SF6电气设备故障诊断模型．实验表明,构建的模型对放电故障的预测达到88．23％,并与BP神经网络模型的预测结果进行了比较,证实了在SF6电气设备故障诊断的研究中,概率神经网络要优于BP神经网络．     

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!     

The Reader Response Approach to Teaching of English Literature

During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context.