毕业论文通信与信息系统论文（定稿）.doc

毕业论文通信与信息系统论文（定稿） 通信与信息系统论文以下资料为精心收集，给大家，建议可以先下载再阅读，包含了经验心得、选题指导、参考文献、范文还有格式的技巧，对论文写作绝对非常有用，如果对论文还有什么不明白的，可以直接搜索品学论文网上查看对应专业的范文或者直接咨询在线指导老师。 【写作论文前必看品学论文网老师总结的论文写作经验】1.论文写作万不可抄袭。 大家着手准备论文时，首先就是寻找参考资料和范文，借助搜索引擎的强大，我们能够在网上搜索到非常多的参考文献和资料，但是来品学论文网的同学们通常遇到的问题就是对参考文献和范文不能合理利用，想偷工减料，直接借用是非常常见的。 现在无论是本科论文还是硕士论文都会通过抄袭检测软件查重，直接影响到毕业。 所以请大家务必重视。 2.论文需要创新，不能随大流。 这点大家都能想到，如果跟你同学的题目或者内容一样，肯定不会的高分，论文的创新可以从提出新的观点，结合案例分析，用一些数据分析工具，结合新的理论等方面进行。 3.如何快速写作论文。 如果你仅仅是想毕业，而不是做出杰出的科研成就，那么就少看一些正规的论文写作方法。 首先，找出一堆最新的参考文献与范文，最好是近2年的，如果太老旧，肯定在网上传遍了，可能你同学也在用，最近范文可以在品学论文网的数据库中搜下；然后，通过结合多篇文章给自己拟个题目和提纲，与别人的论文区别开来最重要的就是提纲的写作，一定要细分到三级提纲；最后，参考.qfpaper./post/940.html这篇文章对论文的抄袭检测机制做了解，对文章理论部分进行改写，再结合案例做具体的分析描述。 以下是品学论文网该专业众多范文中的一篇矿井提升机变频调速控制系统毕业论文【论文内容】本论文的研究目标是提升机基于PLC的矢量控制变频调速系统在矿山生产中的实际应用,对现有的调速控制系统进行改造设计,提高精度,在更安全的范围内保证矿山生产的顺利进行。 矿井提升系统是一个高强度作业系统,因此对提升机电气传动系统也有更高的要求。 矿井提升机调速控制系统硬件部分由变频器、可编程控制器、司机操作台、监视系统及提升机机械传动部分构成。 设计中充分考虑到控制系统使用环境恶劣,对电控系统采取了保护和抗干扰措施;软件中加设故障处理子模块,使操作系统更加安全可靠。 本调速系统与其它控制系统的不同之处在于,提升机速度给定采用PLC软件编程直接生成S形速度给定曲线,特点是可根据用户需要进行编程,应用灵活,系统为无级调速,调速性能好。 本文还给出了提升机调速控制系统数学模型,详细阐述了矢量变换原理,随后由简化的数学模型建立了Simulink下的矢量控制仿真系统,对矢量控制变频调速系统进行仿真。 以验证该调速控制系统的可行性。 【英文摘要】The mine hoist isoften beencalled thethroat ofmine mountainby people,which isthe mostimportant equipmentsin minemountain.It isthe onlyroad ofcontactting theground and the bottomof awell in the wholemineral well.It takesthe importantcarriage responsibilityof ore,material andpersonnel etc.It iscrucial formine hoistthat stabilityand reliability.The electricitycontrols system of traditionalmine hoistexist manysafe questions.Although theelectron-control system of theelevator through the developmentof quitea fewgeneration,people carriedon animprovement fromthe machine,electronics,maintenance.etc.,obtaining certainresult.There arealso manyother questionsin controllingspeed byusing rotorring resistancein whichmany ACrelaycontactor are used,such as,too muchenergy consumption,very plicatedcontrolling circuits,breaks downeasily;in addition,the badcondition(dust,pour waterand thewhereabouts heavything ofblunt hitetc.)of thespot usageresulted in the function of variousmachinery fittingand electricelement loseefficacy;At last,the artificialmistake of the operation and thelimit studyto theroute oftramcar,make existingthe protectioncan notattain anexpectation ofresult,cause troubleto the promote system,so collieryaident takeplace sometimes,endanger life,affectting the mineral wellto producenormally.Therefore,the control system ofmine hoistspeed regulationwhich developsa highperformance isthe topicof theutmost urgency.The researchtarget ofthis thesisis to promote its function ofminehoistby carryingonareformation to the traditionalcontrol systemand tryto bihe programmablecontroller(PLC)strong controlfunction withVariable-requency Regulating-speed technologytogether andapply inmine.This paperintroduces thedeveloping situationof the electric controlledsystemof the minehoist,analyzes onthe featuresandthe functions of the PLCcontrol system,and connectingwith theactual conditions,expounds thepracticability of the The Variable-frequency Regulating-speed ControlSystem of the Mine Hoist adoptingThe PLCControl Mode.All functionsof thetraditional systemare reservedinthereformation,andmake gooduse of the PLCintelligence controlfunction.So raisedthe system safety andefficiency of themine. (1)Intensified asafety protectionfunction.The newcontrol systemafter reformedadopts doubleredundancy structuresoftware security circle andrelay hardwaresecuritycircle,once oneof themworking,the safereturn thenacts.The signalof safereturn,such as,overwind,overspeed,decelerate etc,all doubleprotection andassure the systemsafetyprotection. (2)Make use of PLC to carry on anintelligence treatmenttowards running-time retardancedot,highly shortentopromotecycle,raising produceefficiency,can carry out zerocreeping butaurate stop. (3)Reliability good,control precisionhigher.Make use of thePLCtogive areference velocityand raisea controlprecision.The original system adoptingrotor-ring resistancehave stagespeed regulation,speed regulationperformance difference,and fluctuationbig,failure ratehigher. (4)Raise protectionreliability,carryout a numericaltype protection.Make useofthePLC implementationnumerical relayingprotection,raised protectionreliability,intheoriginalsystemmany relayareusedto protectingthe system.The relayis anold stylemechanical structure,sometimes theresidual magismof coilwill causea mis-operation,the newsystem makesuseofcurrent orvoltage transmitterto carryout protectionthroughtheA/D module,pare with the referencesignal,and thensend outcorresponding guardsignal,thus carryoutadependable protection. (5)Make useofthePLC achievethe wholeprocess numericaltype strokecontrol.The oldsystem controlprecision islow,adaptation capacitydifference,protect functionweak,just thesefaults arethe importantreasons whichresult inthe severpromote aident.The newsystem makesuseofThe countmodule tocalculate thebidirectional pulsesfrom encoder,and thendo somework,thus wecan getposition andthe speedofthecage atpresent,also PLCcan carryon otherprotection thathave somethingto dowith positionand speedofthecage.such as,overwind,overspeed andlose-rope etc.The wholesimulation systemthat TheVariable-frequency Regulating-speed ControlSystem ofMineHoistdivide threestages tocarryon,first aordingtothefunctionoftheelectric control systemwith matchan industrialdepartment ofcoalthe coalmine appropriationequipments tostandardize thetechnique mitteeto putforward ofthepromotemachine electric controlsystemstandard,make surethe hardwareconstitutes andsoftware oftechnique indexoftheelectric controlsystem;Secondly,make useofthestrong simulationsystemofthe MATLABto createthe mathematicalmodel ofthree phaseasynchronous motor,set upthe simulationmodel ofTheVariable-frequency Regulating-speed ControlSystem;Finally,on thosebase ofwork,plete thewhole systemsimulation,analysis simulateddata inorder toidentify whetherthe systemsfunctioncan satisfywiththedesign indexor not.After domany workabout theelectriontrol,such as,Simulation andThe promotemachine machinerycharacteristic analysis;From theresults cansee theelectriontrolsystem can attain thedesign request,the controlscheme ofthesystemis reasonable,thefunctioncanattainthe requestofthemine safeproduction.由于篇幅所限，以上题目对应的毕业论文范文请到【品学论文网】查阅，另外，你可以根据自身需求定制毕业论文写作服务，在线咨询王老师qq【814-952-825】如果您还在为论文的写作烦恼，立刻搜索“品学论文网”获得在线写作指导，数百名在线论文辅导专家等着您。 【品学论文网专注于】论文在线辅导、论文抄袭检测、格式、论文原创写作服务