A two-step supervisory fault diagnosis framework.pdf

《A two-step supervisory fault diagnosis framework.pdf》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、ComputersandChemicalEngineering28(2004)21312140Atwo-stepsupervisoryfaultdiagnosisframeworkYvonnePower,ParisaA.Bahri∗SchoolofEngineeringScienceandA.J.ParkerCooperativeCentreforHydrometallurgy,MurdochUniversity(RockinghamCampus),Murdoch,WA6150,AustraliaReceived5Decembe

2、r2002;receivedinrevisedform21December2003;accepted20January2004Availableonline4June2004AbstractTechniquesenablingearlydetectionanddiagnosisoffaultsareimportantintheprocessingindustries.Thispaperemphasisesatechniqueforearlyfaultdetectionanddiagnosisbasedondynamicfault

3、dataandatwo-stepfaultdetectionanddiagnosisframework.Theapproachshowsvariousadvantagesoveralternativemethodsincludingpromptfaultdetectionandlocalisation,applicabilitytolarge-scalesystemswithouttheneedforexcessivecomputingresources,andamodulararchitecturethatallowsplan

4、tsectionstobetreatedindividually.Intheproposedmethod,thelarge-scaleplantisbrokenupintosectionsandaPetrinetbasedonrealtimedataisusedtolocatetheparticularsectionoftheplantinwhichthefaultoriginates.ThisPetrinetthenactivatessecondaryneuralnetworks,whichdiagnosetheexactlo

5、cationofthefaultinthatparticularplantsection.Applicabilityoftheproposedtechniqueisdemonstratedthroughapilotplantcasestudy.©2004ElsevierLtd.Allrightsreserved.Keywords:Faultdetectionanddiagnosis;Petrinets;Neuralnetworks1.Introductiondiagnosistrainedondynamicfaultdataan

6、dtheuseofaPetrinetforfaultdetectioninlarge-scalesystems.FaultdetectionanddiagnosisisanessentialpartoftheInthepast,Petrinetshavecommonlybeenusedtomodeloperationofanyprocessingplant.Earlydetectionanddiag-discreteeventsystemssuchasbatchprocesses,wherethenosisoffaultsisi

7、mportantinprocessingindustrysincealotmaterialisoperatedinfinitequantities(orbatches),ratherofdamageandlosscanresultbeforeafaultpresentinthethanforfaultdetectionbasedoncontinuoustimedata.How-systemisdetected.Inaddition,itbecomeshardertodistin-ever,evenwithacontinuouspr

8、ocess,dataiscollectedfromguishtherootcauseofthefaultoncethefaultpropagatesthedistributedcontrolsystem(DCS)atdiscretetimein-throught