网络控制系统的模糊动态调度与变采样周期算法研究

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1、北京交通大学硕士学位论文网络控制系统的模糊动态调度与变采样周期算法研究姓名：李斌申请学位级别：硕士专业：交通信息工程及控制指导教师：尹逊和20080601ABSTRACTABSTRACT：NCSfNetworkedControlSystem)isafullydistributed，network-basedreal—timefeedbackcontrolsystem，whosemaincharacteristicisthatinformationexchangeofthedifferentpartsofthecontrolsystemis

2、achievedthroughnetwork．Theadvantageofcontrolsystemcombinedwiththatofnetwork，NCShasextensivecontrolrange，lesslineconnecting，strongadaptabilityandlowoperationcost，andthereforehaswideapplicationprospects．Butunfortunately,introductionofnetworkalsobringsalotofnewproblemssuchas

3、network—induceddelay,datapacketdropoutandSOon，whichhaslimitedfullplayofthesystemperformance．HowtosolvetheseproblemsinordertoeffectivelyplaytheadvantageofNCShasbecomearesearchfocus．Atpresent，researchonNCSmainlyfocusesoneithercontrolornetworkscheduling．Thisdissertationfocus

4、esontheresearchofnetworkscheduling,whichobjectiveistominustheeffectofthoseproblemsonNCSandimprovetheperformanceofNCSbydesigningproperdynamicschedulingalgorithmandvariablesamplingperiodalgorithm．Firstofall，developmentofNCSandtheexistingbasicproblemsareintroducedandresearch

5、statusofschedulinginNCSareanalyzed；Secondly,basicstructureandfunctionofTrueTimesimulationtoolboxusedintheresearcharesimplyintroduced，andamulti·loopNCSsystemmodelwithschedulersisbuildbasedonTrueTime．TheimportanceofschedulingtoNCSisdisplayedbysimulation；thirdly,consideringt

6、hesystemerrorandthechangerateofsystemerrorandusingneuralnetworkfuzzycontroltheory,afuzzydynamicschedulingalgorithmbasedonneuralnetworkisdesignedandthenappliedtotheNCSmodelbasedonTrueTime，whichshowseffectivenessinthesimulation，whilethebasicprincipleofthealgorithmisdiscusse

7、dindetail；eventually,takingtheeffectofsamplingperiodontheperformanceofNCSintoconsideration，avariablesamplingperiodalgorithmundergivennetworkutilizationrequirementsisdesigned，andcombinedwithschedulingalgorithmandthenappliedtotheNCSmodelbasedonTrueTimeintheformofsamplingper

8、iodregulators，whichshowseffectivenessinthesimulation，whilethebasicprincipleandrealizationprocess