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1、45thAIAAAerospaceSciencesMeetingandExhibitAIAA2007-7618-11January2007,Reno,NevadaAnAgent-basedApproachtoHealthMonitoringSystemsAppliedtotheISSPowerSystem12345M.J.Lyell,W.Krueger,G.Zhang,R.Xu,L.HaynesIntelligentAutomation,Inc.,Rockville,MD,20855USA6RichardAlen
2、aNASAAmesResearchCenter,MoffettField,CA,94035USAWereportonthedesignanddevelopmentofanagent-basedapproachforhealthmonitoringsystems.Ahealthmonitoringsystemtypicallyinvolvesmultiplesensorswhosereadingsprovideinformationastothestatusofequipmentcomponents.Abnorma
3、lsensorreadingscanindicatemalfunctions,eitherinaparticularpieceofequipmentorinanothercomponentonwhichitdependsorwithwhichitinteracts.Healthmonitoringsystemsoperateinnearrealtime.Largeorcomplexsystemsthatinvolvenumeroussensorsaredataintensive.Variousalgorithms
4、ordataminingapproachessupporttheidentificationofanomaloussystemoperation,aswellasclassificationofprobablecause;i.e.,whathasfailed.Asphysicalsystemsbecomemorecomplexand/ormoreautonomous,healthmonitoringsystemsbecomemorecritical.Ourworkhasfocusedonthedesignandd
5、evelopmentofanagent-basedhealthmonitoringsystemthatservesasaconceptualprototypeforautonomoushealthmonitoringsystemsforsupportofspaceexplorationapplications.Weutilizedtheelectricalpowersystem(EPS)oftheInternationalSpaceStation(ISS)asthephysicalsystemofinterest
6、.PertinentdatausedinourhealthmonitoringsystemisprovidedbyresultsfromahighfidelitysimulationoftheISSPowerSystem.Ouragent-basedhealthmonitoring(ABHM)systemdesignprovidesforflexibility;multiplefamiliesofassessmentalgorithmscanbeappliedtothesensordatainparallel.N
7、omenclatureABHM=Agent-basedHealthMonitoringAOSE=Agent-orientedSoftwareEngineeringBCDU=batterychargedischargeunitDDCU=DirectcurrenttoDirectcurrentConverterUnitDCSU=DirectcurrentswitchingunitsEPS=ElectricalpowersystemFDI=faultdiagnosticsandisolationISS=Internat
8、ionalSpaceStationORU=orbitalreplacementunitPCA=PrincipalComponentAnalysisalgorithmME=MaximumEntropyalgorithmSAW=SolarArrayWingSSU=SequentialShuntUnitSPE=SquaredPredictionErrorTBM=Transfer
