A pulsed plasma thruster fault detection and isolation strategy for formation.pdf

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1、AppliedSoftComputing10(2010)746–758ContentslistsavailableatScienceDirectAppliedSoftComputingjournalhomepage:www.elsevier.com/locate/asocApulsedplasmathrusterfaultdetectionandisolationstrategyforformation§flyingofsatellitesA.Valdes,K.Khorasani*DepartmentofElectricalandComputerEngineering,1455

2、deMaisonneuveBlvd.W.,ConcordiaUniversity,Montreal,QuebecH3G1M8,CanadaARTICLEINFOABSTRACTArticlehistory:Themainobjectiveofthispaperistodevelopadynamicneuralnetwork-basedfaultdetectionandReceived13October2008isolation(FDI)schemeforpulsedplasmathrusters(PPTs)thatareemployedintheattitudecontrol

3、Receivedinrevisedform20July2009subsystem(ACS)ofsatellitestaskedtoperformformationflying(FF)missions.AhierarchicalAccepted5September2009methodologyisproposedthatconsistsofthreefaultdetectionandisolation(FDI)approaches,namely(i)Availableonline15September2009a‘‘low-level’’FDIscheme,(ii)a‘‘high-

4、level’’FDIscheme,and(iii)an‘‘integrated’’FDIscheme.BasedonthedatafromtheelectricalcircuitofthePPTs,theproposed‘‘low-level’’FDIschemecandetectandKeywords:isolatefaultsinthePPTactuatorswithagoodlevelofaccuracy,howevertheprecisionlevelispoorandFaultdetectionandisolationbelowexpectationswiththe

5、misclassificationratesasexpressedbyFalseHealthyandFalseFaultyDynamicneuralnetworksparametersbeingtoohigh.Theproposed‘‘high-level’’FDIschemeutilizesdatafromtherelativeFormationflyingofsatellitesPulsedplasmathrustersattitudesoftheFFmission.Thisschemehasgooddetectioncapabilities,howeveritsisolat

6、ioncapabilitiesarenotadequate.Finally,theproposed‘‘integrated’’FDIschemetakesadvantageofthestrengthsofeachoftheabovetwoschemeswhilereducingtheirindividualweaknesses.Theresultsdemonstrateahighlevelofaccuracy(99.79%)andprecision(99.94%)withamisclassificationratesthatarequitenegligible(lessthan

7、1%).Furthermore,theproposed‘‘integrated’’FDIschemeprovidesadditionalandinterestinginformationrelatedtotheeffectsoffaultsinthethrustproductionlevelsthatwouldnothavebeenavailablefromsimplyusingtheloworthehighlevelschemesalone.ß2009ElsevierB.V.Allrightsrese