This paperpresentsapracticalsolutiontotheproblemofrobustfaultdetectionandisolation(FDI)for faultsaffectingthethrustersofasatellitesystemMarsExpress(MEX).Anon-linearmodelofMEXis usedandthesystemisconsideredinthepresenceofmeasurementerrors,uncertaintyanddisturbance. A robustapproachtoFDIresidualgeneratordesignisdescribedtorealiseadiagnosticschemeforthe satellite system,focusedona‘‘thrustermodulation’’problem.Theapproachtakenisbasedonbothstate estimationofanaccuratelinearmodelforthesatellitesystemandunknowninputde-couplingto achieve robustFDIinthepresenceofseveredynamicuncertaintyduringmainenginedeployment.A brief descriptionofthesatellitestructureisoutlinedinordertohighlightthemainsourcesof uncertaintyanddisturbanceaffectingthemonitoredsystem.Thesatellitenominalandfaultyconditions are simulatedbymeansofanindustrystandardnon-linearmodelimplementationintheMATLABs and SIMULINKs environments. Acomparisonwiththeexistingfaultdiagnosisschemeimplementedon board theMEXisalsoreported.SuitableperformancecriteriaareintroducedtogetherwithMonteCarlo analysis forbothdesigntuningandassessingtherobustnessandperformanceevaluationofthe completeFDIdesignstrategy.
ROBUST FDI APPLIED TO THUSTER FAULTS OF A SATELLITE SYSTEM
SIMANI, Silvio;
2010
Abstract
This paperpresentsapracticalsolutiontotheproblemofrobustfaultdetectionandisolation(FDI)for faultsaffectingthethrustersofasatellitesystemMarsExpress(MEX).Anon-linearmodelofMEXis usedandthesystemisconsideredinthepresenceofmeasurementerrors,uncertaintyanddisturbance. A robustapproachtoFDIresidualgeneratordesignisdescribedtorealiseadiagnosticschemeforthe satellite system,focusedona‘‘thrustermodulation’’problem.Theapproachtakenisbasedonbothstate estimationofanaccuratelinearmodelforthesatellitesystemandunknowninputde-couplingto achieve robustFDIinthepresenceofseveredynamicuncertaintyduringmainenginedeployment.A brief descriptionofthesatellitestructureisoutlinedinordertohighlightthemainsourcesof uncertaintyanddisturbanceaffectingthemonitoredsystem.Thesatellitenominalandfaultyconditions are simulatedbymeansofanindustrystandardnon-linearmodelimplementationintheMATLABs and SIMULINKs environments. Acomparisonwiththeexistingfaultdiagnosisschemeimplementedon board theMEXisalsoreported.SuitableperformancecriteriaareintroducedtogetherwithMonteCarlo analysis forbothdesigntuningandassessingtherobustnessandperformanceevaluationofthe completeFDIdesignstrategy.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
