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1.
使用VB6.0对发动机控制系统上位机通信监控程序进行了设计和开发,通过程序编制,实现了对发动机的工况参数和原电控单元(ECU)控制参数的实时采集、存储、显示、离线图形化处理,并对DSP进行程序在线调整、对执行器进行实时控制.  相似文献   

2.
本文主要利用DSP对脉冲信号进行采集与处理,并对DSP与上位机之间串口通信的方法进行了研究.以TMS320LF2407为数据采集的核心,利用其模数转换模块、数据存储模块完成数据的采集;通过串口通信模块实现DSP与上位机之间的数据传输.  相似文献   

3.
对基于DSP和LabVIEW控制的移相全桥PWM软开关实验电路进行了开发,实验系统采用上、下位机的结构。DSP作为下位机采集系统电压信号和输出,用于控制移相全桥电路的PWM波;上位PC机中用LabVIEW软件开发了控制程序,实现了信号显示、波形保存和对下位机的控制。通过对实验系统的实际运行,验证了实验系统的正确性和实用性。  相似文献   

4.
JY82A型矿用隔爆型检漏继电器的应用与检修   总被引:1,自引:0,他引:1  
JY82A矿用隔爆型检漏继电器是JY82矿用隔爆型检漏继电器的改进型产品.在380V或660V中性点对地绝缘的三相三线制供电网路中,与总馈电开关配合,实现一级漏电保护或两级选择性漏电保护,用于长期监视电网对地绝缘电阻,防止人体触电事故的发生以及限制由于漏电引起的事故扩大。  相似文献   

5.
基于ARM单片机与PC机通信设计了8路通用数据采集系统,该系统能够同时采集电压、电流、温度、压力、湿度等不同类型的数据.由PC机作为上位机选择采集通道与数据采集类型,通过传感器及放大电路将被采集对象转换成单片机能识别的模拟电信号,同时由ARM内部集成的10位高速A/D将模拟电信号转换成数字信号,通过串口以串行通信的方式与上位机进行数据及控制指令的通信,将采集的数据传输给上位机,由上位机完成数据分析、换算、储存、显示、调取历史数据等功能.  相似文献   

6.
设计一个模拟电网,在实验室将该模拟电网、矿用隔爆馈电开关和矿用检漏继电器按一定的结线方式连接,构成煤矿漏电保护模拟系统,该模拟漏电保护系统可反映供电系统的绝缘水平(电阻),同时可模拟煤矿在单项漏电、两项漏电、三项漏电、有人触电等不同状态下的漏电保护,并且测出漏电保护动作电流和系统的绝缘水平(电阻),揭示煤矿漏电保护的工作原理。  相似文献   

7.
随着自动化技术的快速发展,对电网的安全要求越来越高,采用下位机与上位机相结合的方式,实时监控低压电网运行状态信息,下位机实现对电网运行信息实时采集,上位机采用工业组态软件i FIX开发相应的监控系统,实现电网运行状态信息的实时显示,并实现对低压电网的远程控制。  相似文献   

8.
风机设备故障必然伴随着振动,所以振动信息是判定设备是否故障的重要标准。使用MATLAB和TMS320F28335型DSP,设计了用于监测风机变流器振动信息的系统。使用加速度传感器采集风机的振动信息,通过调理电路对电压和电流调理后,信号经过DSP自带的模数转换模块传输给DSP,将处理后的振动信息通过I2C通信模块发送给上位机MATLAB显示。通过这种方式,振动信息可以实时显示在PC上,且不会影响DSP上挂载其他设备。  相似文献   

9.
本文阐述了S7-200PLC自由口通信应用在矿用防跑车组网系统中的应用,简述了矿用防跑车工作原理和通信接口电路、自由口通信协议组成及现场级和上位机通信的软件实现。  相似文献   

10.
本文介绍了三相异步电动机微机测试实验系统 ,它采用上下位机硬件结构形式。下位机测量三相异步电动机及负载的电压、电流、转速和功率角 ,对数据进行处理 ,可直接在实验箱显示出电压、电流、功率因数、转矩等 6个数据 ,也可将测量结果传送给上位机 ,由上位机对数据进行处理 ,画出三相异步电动机的工作特性。目前实验系统已在实验室使用 ,满足了实验的要求。  相似文献   

11.
《海外英语》2007,(5):44-45
It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,  相似文献   

12.
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/  相似文献   

13.
《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   

14.
汉字倒说     
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   

15.
《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   

16.
王菲 《华章》2007,(12):273-273
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   

17.
裴水妹 《华章》2007,(11):196
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   

18.
19.
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…  相似文献   

20.
钱生钱!     
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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