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1、4thInternationalConferenceonSustainableEnergyandEnvironmentalEngineering(ICSEEE2015)Thereliabilityanalysisformainfuelacceleratedregulationsystemofaero-enginebasedonintervalmodel1,a2,b1,c1,dZHANGLei-lei,LIUSheng-zhi,ZHANGZhengandZHANGFeng1NorthwesternPolyt
2、echnicalUniversity,China2AVICLandingGearAdvancedManufacturingCorp,Chinaad18710495493@163.com,nwpuwindy@mail.nwpu.edu.cnKeywords:Mainfuelacceleratedregulationsystem;Intervaltheory;Faulttree;Failureprobability;MonteCarlomethodAbstract:Toeffectivelyassessthe
3、reliabilityofaero-enginemainfuelacceleratedregulationsystemunderpoorfailurestatisticsinformation,afaulttreeanalysismethodbasedonintervalmodelispresented.Firstly,accordingtomainfuelacceleratedregulationsystemprincipleandfailuremechanism,thesystemfaulttreem
4、odelisestablished.Thenintervalnumberisintroducedtodescribetheuncertaintyofbottomevent,andachievetheuncertaintytransferfrombottomeventstotopeventthroughconstructingAND/ORgateintervaloperator.Finally,thefailureprobabilityestimationprocessofsystemtopeventisp
5、roposedbasedondoubleMonteCarlomethod,andgettheaccuratefailureintervalofsystemresponse.Atthesametime,theimportancemeasurementanalysisofbottomeventsisconductedtoidentifythekeyfailureevents,whichprovidesguidanceforthemainfuelacceleratedregulationsystemindesi
6、gnandmaintenance.IntroductionSurgeisanunstableworkingconditionunderlowfrequency,highamplitudeoscillationofairflowalongcompressionsystemaxialdirection.Asaspecialcasethataero-enginesoftenencounterduringacceleration,severeenginesurgemaycausemechanicaldamage,
7、lossofcontrolandstallparking,[1]whichseriouslyendangerthesafetyofaircraftflight.Asanimportantcomponentofairpowerdevicecontrolsystem,thefunctionofaero-enginemainfuelacceleratedregulationsystemistokeeptheenginealwaysworkingatdesignconditionduringacceleratio
8、nthroughautomaticallyandeffectivelyregulatingthefuelsupplyforengine,thusefficientlyreducetheenginesurgefaults.Themainfuelacceleratedregulationsystemiscomplex-constructed,composedoflargequantityofsensors,limiters,val
