›› 2012, Vol. 32 ›› Issue (2): 55-61.doi: 10.3780/j.issn.1000-758X.2012.02.009

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MultipleFaultDiagnosisAlgorithmUnderLargeFalse-alarmRateTests 

 ZHANG  Sen1, YU  Deng-Yun2,WANG  Jiu-Long1   

  1. (1InstituteofMannedSpaceSystemEngineering,China Academy of Space Technology,Beijing100094)
    (2ChinaAerospaceScienceandTechnologyCorporation,Beijing100037) 
  • Received:2011-05-18 Revised:2012-04-25 Online:2012-04-25 Published:2012-04-25

Abstract:  Multiplefaultdiagnosisunderunreliabletestsusingthemultisignalmodelwasstudied.TheoptimalmultiplefaultdiagnosisproblemisNPcomplete,sosuboptimalalgorithmwasusedforlargescalesystemdiagnosis.Agoodfaultestimationunderlowfalsepositiveratewasobtainedbythesubgradientoptimizationmethod.Butifthesizeofthegraphisbigandthefalsealarmrateishigh,thisalgorithmwill notbeabletoeliminatetheinfluenceoffalsepositive,andtheresultingestimationwouldcovereveryfailedtestinsteadoffindingthetruefaultpositionofthesystem.Anewkindofdiscriminatefunctionconsideringbothfalseandtruepositivetestswasused,andanimprovedgeneticalgorithmwasproposedtosearchthefailurecomponents.Simulationresultsshowthatthenewmethodisfasterthansubgradientoptimizationandhasahighercorrectisolationratewhenintercurrentfaultsarefew.

Key words: Genetic algorithm, Multi signal model, Fault diagnosis, False alarm, Spacecraft