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1、毕业论文外文译文学院自动化与电气工程学院专业自动控制Component-basedSafetyComputerofRailwaySignalInterlockingSystem1IntroductionSignalInterlockingSystemisthecriticalequipmentwhichcanguaranteetrafficsafetyandenhanceoperationalefficiencyinrailwaytransportation.Foralongtime,thecorecontrolcomputerad
2、optsininterlockingsystemisthespecialcustomizedhigh-gradesafetycomputer,forexample,theSIMISofSiemens,theEI32ofNipponSignal,andsoon.Alongwiththerapiddevelopmentofelectronictechnology,thecustomizedsafetycomputerisfacingseverechallenges,forinstance,thehighdevelopmentcosts,
3、poorusability,weakexpansibilityandslowtechnologyupdate.Toovercometheflawsofthehigh-gradespecialcustomizedcomputer,theU.S.DepartmentofDefensehasputforwardtheconcept：weshouldadoptcommercialstandardstoreplacemilitarynormsandstandardsformeetingconsumers’demand[1].Inthemean
4、time,thereareseveralexplorationsandpracticesaboutadoptingopensystemarchitectureinavionics.TheUnitedStatedandEuropehavedomuchresearchaboututilizingcost-effectivefault-tolerantcomputertoreplacethededicatedcomputerinaerospaceandothersafety-criticalfields.Inrecentyears,iti
5、sgraduallybecominganewtrendthattheutilizationofstandardizedcomponentsinaerospace,industry,transportationandothersafety-criticalfields.2Railwayssignalinterlockingsystem2.1FunctionsofsignalinterlockingsystemThebasicfunctionofsignalinterlockingsystemistoprotecttrainsafety
6、bycontrollingsignalequipments,suchasswitchpoints,signalsandtrackunitsinastation,andithandlesroutesviaacertaininterlockingregulation.Sincethebirthoftherailwaytransportation,signalinterlockingsystemhasgonethroughmanualsignal,mechanicalsignal,relay-basedinterlocking,andth
7、emoderncomputer-basedInterlockingSystem.2.2ArchitectureofsignalinterlockingsystemGenerally,theInterlockingSystemhasahierarchicalstructure.Accordingtothefunctionofequipments,thesystemcanbedividedtothefunctionofequipments;thesystemcanbedividedintothreelayersasshowninfigu
8、re1.Figure1ArchitectureofSignalInterlockingSystem3Component-basedsafetycomputerdesign3.1DesignstrategyThedesignconcep
