基于霍尔车速传感器的测控平台设计

提出了一种基于霍尔车速传感器的测控平台的设计方法。该平台主要包括DSP系统板、霍尔车速传感器、汽车车速工况模拟装置、汽车车速仪表以及上位机。介绍了车速表、车速传感器及车速工况模拟装置选型,叙述了硬件设计过程,阐述了汽车仪表车速系数标定、车速信号频率测量和带前馈控制的PID车速电机控制策略及系统测控流程。测试结果表明,车速传感器信号测量准确可靠,模拟车速工况控制快速平稳。该平台能够加深学生对汽车车速参数标定与测量、霍尔车速传感器信号特性及信号调理电路设计、前馈控制的PID控制策略等的认知理解。     

高速摄像机远程同步触发系统

为了满足高速摄像机远程同步触发的要求,设计了基于STM32微控制器的以太网高速摄像机远程同步触发系统,触发信号发送器采集外部触发按钮的信号,通过以太网传给触发信号接收器,控制接收器完成多台高速摄像机的远程同步触发,提高了系统的工作效率。     

虚拟仪器在动态压力标定系统中的应用

该文将虚拟仪器应用于动态压力标定系统，使用具有预触发功能的双通道同步数据采集装置，很好地解决了标准源信号与被校信号同步获取的问题。将COM技术开发的仪器驱动与上层的VB界面联合使用，使得校准操作灵活。实验结果表明该系统比传统校准设备可扩展性增强，系统精度提高。     

馈线测控装置的组态设计及应用

设计了馈线测控装置,用PLC控制断路器,利用KingView在监控机上进行界面组态,兼用触摸屏组态监控,实现控制开关、触摸屏、监控机3处不同点对断路器的监控,实现了保护、投退、整定及自动重合闸的动作过程以及事故信号、预告信号功能。该装置可完成断路器屏控操作实验、后台监控机操作实验、继电保护实验、自动装置实验、综合自动化系统通信连接实验、组态控制实验及模拟信号发生器实验。     

单片机的简易信号发生器的设计

提出了利用单片机系统来设计简易信号发生器的思路。利用软件设计数字信号,再通过DA转换得到模拟信号。通过按键来选择或切换不同类型的信号。此种思路可以简化信号发生器的硬件结构,降低生产成本。     

自制激光传输模拟信号和数字信号演示仪

人教版高中物理第三册“激光”一节中有这样一句话,“由于激光是相干光,所以它能像无线电波那样进行调制,用来传递信息”。激光传递的信息可以是模拟信号,也可以是数字信号。1激光传输模拟信号本装置包括激光发射器、激光接收器和录音机。激光发射器将声音信号转化为激光信号发射出去;激光接收器将接收到的激光信号转化为电信号,利用录音机的功率放大器将电信号放大后推动扬声器发声,又将电信号还原成声音信号。1.1工作原理图1是激光发射器的电原理图。话筒BM将声音信号转化为电信号,电信号通过电容C1耦合到三极管V1的基极,经三极管放大后…     

基于KZS-1型直流运动控制系统实验装置的研制

针对KZS-1型直流运动控制系统实验装置老化的问题,采用了新型高性能集成移相触发器TC787构成的触发电路代替传统分立元件构成的触发电路。介绍了TC787芯片的内部结构、工作原理及触发电路的设计思路。实践表明,该装置通过改装后,系统抗干扰性能强,外接元件少、精度及集成度高等多项优点,能满足直流运动控制系统实验教学要求。     

红外光通信装置设计与实现

采用红外发射管和红外接收管实现了模拟信号和数字信号的红外通信。红外模拟语音系统中,将声音信号转化来的电信号作为模拟信号直接发送,在接收端经过集成放大LM386芯片等处理后,将电信号还原成声音信号,实现红外模拟通信。红外数字通信系统中,增加一路数字信道,采用数字温度传感器DS18B20实时对温度进行采集,通过单片机STC89C52控制将数字信号发送,在接收端经过非门输入单片机通过1602得以显示。     

HL-2A实验装置等离子体图像采集及回放的实现

本文是对HL-2A实验装置等离子体放电过程图像同步采集以及回放实现的论述,该技术也是在受控热核聚变领域内的托卡马克装置上新发展起来的一种可靠而直观的实验诊断手段.本系统由硬件系统和软件控制设计两部分构成,采用外部信号触发技术进行等离子体实验放电图像同步采集,为科研人员进行实验物理分析提供直观而可靠的图像数据.     

鱼雷电磁引信模拟目标信号源的设计

为了给鱼雷电磁引信提供有效的检测方法,基于鱼雷电磁引信目标信号数学模型的分析,设计了鱼雷电磁引信模拟目标信号源。该设计采用电磁传感器对引信辐射电磁场进行测量的方式获得信号参数,以仿真的方式设定鱼雷过靶参数,然后通过程控计算机对参数进行解算,利用目标信号数学模型产生模拟信号,最后通过电磁耦合器加载给引信接收装置。实验表明该设计是正确可行的。     

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.