悬挂运动控制实验仿真系统的设计与实现

针对一个涉及多门知识的综合性实验设计并实现了软件仿真系统，详细介绍了该仿真系统的设计思想和实现方法，分析了此类实验的特点以及如何通过软件仿真快速高效地得到直观的感觉、并通过仿真获得必要的数据，从而在节省时间、实验材料、快速确定实验参数的前提下，完成好整个实验。最后指出通过软件仿真来完成较为复杂的综合性实验是一种重要的辅助手段。     

基于MATLAB的FHSS通信系统设计与实现

本文利用MATLAB高级程序设计语言实现了FHSS通信系统的可视化设计,直观地显示了FHSS通信过程,介绍了系统设计方法与运行结果,通过改变信噪比能直观地观察到FHSS通信系统的抗噪声性能,有利于研究FHSS通信系统。仿真结果表明,此设计方法可行。     

基于MATLAB GUI的Ziegler-Nichols PID参数整定仿真系统

PID控制器的设计是"自动控制原理"课程的重要内容,Ziegler-Nichols法是一种典型的PID控制参数整定方法。该方法中比例系数K、时间常数T、延迟时间τ的确定是关键,其值可通过开环单位阶跃响应曲线的拐点及切线分析获得,拐点及切线从图形直接观察分析不够准确、快速。通过Matlab GUI仿真,实现了参数K、T和τ的直接获取,拐点及切线的绘制,PID整定参数的计算及对应单位阶跃响应曲线的显示。该仿真系统操作方便、能够直观快速地获取参数、节省了大量的分析和计算时间。该仿真系统可用于"自动控制原理"课程教学和实验教学,有助于学生对Ziegler-Nichols法的理解,提高学生的分析和设计能力。     

Sumlink仿真在通信原理课程教学中的应用

《通信原理》课程的特点是概念多、理论抽象、知识体系复杂,为了更好地将理论教学和实践相结合,可利用Simulink设计构建通信系统仿真模型,使得通信系统的分析过程变得相对直观,有助于学生更好地理解通信系统性能。本文以SSB系统的调制、解调和抗噪声分析为例来说明Simulink在通信系统仿真的应用。     

过程控制系统仿真与实践结合的实验教学设计

将Matlab/Simulink仿真实验与实物应用实验结合,设计了部分仿真实验,重点在控制模型的设计和控制规律的验证以及参数整定。通过仿真实验,学生能够比较直观和深刻地掌握PID控制规律与特性,能够根据要求设计出控制模型,对学生掌握过程控制系统理论基础具有重要的意义。     

基于Matlab/Simulink和GUI的运动控制系统虚拟实验平台设计

利用Matlab环境中的Simulink仿真工具箱和友好的GUI界面,设计和实现了运动控制系统课程的可视化虚拟实验平台的构建。该实验平台包含运动控制系统实验教学中典型的仿真模型和仿真实例分析,能够实现硬件实验所不能完成的项目,帮助学生更直观地理解运动控制系统的组成和工作原理,增强感性认识,培养学生的研究能力、综合应用能力和创新能力。     

基于遗传计算模糊PID的数字随动系统设计

开发了以TMS320F28335为主控芯片的数字随动系统控制器,实现了遗传计算模糊PID控制算法在微控制器上的应用。上位机软件采用MFC程序设计编写,实现控制器与PC机的串行通信,将给定量与反馈量在PC机上进行波形和形态显示,便于更直观地对其控制性能进行分析。实验结果表明,实际控制效果与Matlab仿真有一定的差距。遗传计算模糊PID控制与PID控制相比较,系统的稳态性能增强,动态性能减弱。仿真与真实系统的对比可以使学生对理论与实际有更加直观的认识和深入的理解,能够取得良好的学习效果。     

基于MATLAB GUI的PID控制仿真系统设计

为在"自动控制原理"课程中直观地讲解PID控制中各参数对系统性能的影响,设计了基于MATLAB GUI的PID控制仿真系统。该仿真控制系统可以通过直接输入和从工作空间获取两种方式获取数据,并实现PID参数的动态调整、控制系统动态性能参数及对应单位阶跃响应曲线的绘制等功能。该系统数据的获取及图形的显示实时、直观,可用于课堂教学演示中,也可用于实验教学中,以提高学生分析问题的能力。     

基于遗传计算模糊PID的数字随动系统设计

针对计算机控制系统课程教学的实际需要以及工科学生实践能力的培养,开发了以TMS320F28335为主控芯片的数字随动系统控制器。实现了遗传计算模糊PID控制算法在微控制器上的应用。上位机软件采用MFC程序设计编写,实现控制器与PC机的串行通信,将给定量与反馈量在PC机上进行波形和形态显示,便于更直观地对其控制性能进行分析。实验结果表明,实际控制效果与Matlab仿真有一定的差距。遗传计算模糊PID控制与PID控制相比较,系统的稳态性能增强,动态性能减弱。仿真与真实系统的对比可以使学生对理论与实际有更加直观的认识和深入的理解,能够取得良好的学习效果。     

基于Simulink的分布式光纤声波传感系统仿真实验

为将原理抽象、系统复杂的分布式光纤声波传感（DAS）系统引入物理实验教学,基于MATLAB/Simulink软件开发了DAS系统仿真实验。首先设计直接探测式DAS系统结构,然后给出激光器数学模型、分布式光纤背向瑞利散射数学模型、扰动施加数学模型和光电探测器数学模型,最后搭建Simulink仿真实验平台。基于开发的仿真实验,仿真了不同参数下的DAS系统特性,结果表明,随着激光器线宽和频移率的增加,探测信号中的噪声强度近似线性增大,在系统中加入光放大器能够提高探测信号的信噪比,克服光电探测器的噪声干扰。该仿真实验操作简单、现象直观,可以使学生直观地接触光纤传感的前沿技术,更好地理解DAS系统的工作原理与动态特性,激发学生的实验兴趣,提高其编程能力和分析应用能力。     

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,     

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…     

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.     

STORIES

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.     

巧妙引语(英文)

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     

Information for Authors

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.