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《基于IP的網(wǎng)絡(luò)控制系統(tǒng)時(shí)延計(jì)算及應(yīng)用研究》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、摘要摘要網(wǎng)絡(luò)控制系統(tǒng)是指控制回路通過(guò)網(wǎng)絡(luò)進(jìn)行閉合的反饋控制系統(tǒng)。同傳統(tǒng)的控制系統(tǒng)相比,具有以下優(yōu)點(diǎn):系統(tǒng)覆蓋面廣、成本低、安裝維護(hù)簡(jiǎn)單、靈活性高、便于進(jìn)行故障診斷、遠(yuǎn)程操作與控制和資源共享等特點(diǎn)。但由于網(wǎng)絡(luò)的引進(jìn),給控制系統(tǒng)的信息傳輸帶來(lái)了延遲、信息丟失等問(wèn)題。這些問(wèn)題的存在將降低控制系統(tǒng)的性能,甚至使控制系統(tǒng)不穩(wěn)定。本文著重研究了在全雙工交換式以太網(wǎng)的模型下,控制網(wǎng)絡(luò)中信息傳輸最大時(shí)延的計(jì)算以及控制器的設(shè)計(jì)。在全雙工交換式以太網(wǎng)的模型下,網(wǎng)關(guān)處排隊(duì)的等待時(shí)延是NCS中延時(shí)的關(guān)鍵因素,通過(guò)將QoS
2、引入網(wǎng)絡(luò)控制系統(tǒng),可以對(duì)等待時(shí)延進(jìn)行約束。應(yīng)用網(wǎng)絡(luò)演算的方法計(jì)算網(wǎng)關(guān)處的最大時(shí)延,本文在總結(jié)已有的一些排隊(duì)策略上提出一種基于類(lèi)的加權(quán)輪詢(xún)策略,并推導(dǎo)出最大的時(shí)延計(jì)算公式。目前,大部分的控制系統(tǒng)均為計(jì)算機(jī)控制系統(tǒng),采樣周期的大小必然與網(wǎng)絡(luò)負(fù)載和延時(shí)存在一定的關(guān)系。采用NS2軟件仿真測(cè)試一個(gè)星型網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)下的采樣周期與延時(shí)的關(guān)系。通過(guò)網(wǎng)絡(luò)演算的方法計(jì)算出信息在網(wǎng)絡(luò)中傳輸?shù)淖畲髸r(shí)延,并對(duì)NCS離散化建模,設(shè)計(jì)數(shù)字PID控制器。關(guān)鍵詞:網(wǎng)絡(luò)控制系統(tǒng),全雙工交換式以太網(wǎng),網(wǎng)絡(luò)演算,基于類(lèi)的加權(quán)輪詢(xún)策略,數(shù)
3、字PIOAbstractABSTRACTNetworkedControlSystem(NCS)isanintegrationofnetworkingcommunicationtechnologyandcybernetictheoretic.ANCSconnects,thecontrollers,thesensorsandtheactuatorsthmughonesharednetworkingtoformfeedbackcontrolloops.Comparedwithtraditionalcon
4、trolsystems,theNCShasadvantagesofwidecontrolarea,hi曲reliability,goodflexibility,easymalfunctionfindingandsimpleinstallationandmaintenance,etc.ButwiththecommunicationnetworkinsertedinNCS,therearesomenewproblemssuchastime—delayandlostofpackets.Inthemode
5、loffull—duplex·switchedEthemet,themaximaldelaytimeinthecommunicationandthedesignofcontrolleraretalkedaboutwithemphases.Thewaiting-delaytimecausedbyqueuinginthelineatthegatewayisthemainfactofthedelaytime.Thewaiting·delaytimewouldberestrictedbyQoSinNCSa
6、ndbecalculatedwithnetworkcalculatetheory.Inthisthesis,aclassbasedweightedroundrobinqueuingpolicyisadvancedandthemaximalwaiting·timeiscalculated.Atpresent,mostcontrolsystemsarecomputercontrolsystems,SOthesamplingperiodisrelatedwiththenetworkloadsanddel
7、aytime.Asimplesimulatetestingwithstartopologystructureisprocessedtotestifytherelationshipofsamplingperiodanddelaytime,usingNS2.AftercalculatingthemaximaldelaytimeinnetworkcommunicatingwithnetworkcalculatetheoryandbuildingthediseretemodelofNCS,amethodi
8、sresearchedtodesignthedigitalPIDcontrollerwiththedelaytimedatareceivedbythesimulatetestingbefore.KeyWords:NetworkControlSystem,full—duplex.switchedEthemet,networkcalculate,classbasedwei曲tedroundmbinpolicy,digitalPID學(xué)位論文版權(quán)使用授權(quán)書(shū)本人完全了解同濟(jì)大學(xué)關(guān)于收集、保存