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ID:36356358
大小:3.22 MB
页数:105页
时间:2019-05-10
《基于符号有向图的热力系统故障诊断方法研究》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、华北电力大学(保定)博士学位论文基于符号有向图的热力系统故障诊断方法研究姓名:曹文亮申请学位级别:博士专业:热能工程指导教师:王兵树20060501华北电力大学博士学位论文ABSTRACTTherearemanyproblemsinfaultdiagnosisprocessofcomplexthermalsystem,suchasmultipleinfluencingfactorsofcausingfault,multiplicityofsymptom,strongcouplingamongfaultsandsoon,somefacilityabnormalityofsub·s
2、ystemmayleadtotheparametersabnormalityofthecorrelativefacility.Sointhediagnosisprocess,thefaultSOUrCescanbclocatedeffectivelyonlywhenthefaultpropagationcharacteristicamongthedifferentsub—systemandthermalfacilitycanbesufficientconsidered.ThedeepknowledgemodelofSignedDirectedGraph(SDG)callexpr
3、esscomplicatedcause—effectrelationship,hasthecapacityofcontaininglarge—scalepotentialinformationandgoodcompletenessintheprocessindustrialsystem.OnthebasisofsummarizingtheexistingliteraturesoffaultdiagnosisbasedonSDGmethod,Thispapermainlyresearchessomedifficultiesandkeytechnologies,suchasSDGm
4、odeling,SDGsimplification,SDGreasoningrules,thresholdvaluemodificationofSDGintegrationandtransformofqualitativeandquantitativemodelofSDGandsoon.Theaboveresearchworksimprovethesystemofgraphtheoryandfaultdiagnosismethod.Andaccordingtothecharacteristicofthermalsystemofpowerplant,SDGisfirstprese
5、ntedtoapplyinfaultdiagnosisofthermalsystem.Themainlyresearchresultsarethefollowings:Aimingatthelocalizationoftheabovetraditionalmodelingmethodinactualmodelingprocess,consideringthatthesimulatorcannotonlyprovidehigh-fidelitydynamicsimulationmodelofthethermalsystem,butalsoprovidetheover—allana
6、lysisenvironmentusingthemethodofsystemengineering,aSDGgradingmodelingmethodaidedbysimulationtechnologyisstudied,whichisaneffectivemethodtosolvetheproblemof‘‘informationexplode”andprovidesaveryeffectivepathtosolvethedifficultproblemofSDGmodelingincomplexsystem.ToimprovethediagnosticspeedofSDG
7、diagnosisprocess,theideaofcombiningSDGwithexpeasystemsandthewaytoproducethediagnosticrulesfromSDGaredescribed.Furthermore,toimprovetheSDGdiagnosisresolution,SDGsaresimplifiedbythefollowingways,(1)adoptingdiscretestatetodepictthecontinuousprocesstod
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