基于传递系统模型的在轨卫星故障诊断方法分析

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1、性方面也可以保证各个故障模式Z间的故障效果不会发生混淆。将某卫星一次电源系统作为实例，对其典型故障模式的可诊断性进行讨论，说明该分析方法的有效性。尖键词：故障诊断；传递系统模型；分离策略；状态记忆；分层模型；相似度匹配；可诊断性分析AbstractFaultdiagnosistechnologyisanimportantpartofthespacecraftautonomouscontrolandmanagementsystem,itmayprovidethenecessarysupportforthespacecraftautonomouscontrol,andthesecurity

2、foritssafeandreliableon-boardoperation.Inthisthesis,basedonthebackgroundofspacecraftfaultdiagnosistechnique,thediagnosistheoryanditsapplicationswhichfocusonthetransitionsystemmodelandthefirstprinciplediagnosismethodwereconducteddeeplyinordertosatisfythedemandforthefaultdiagnosissystemfromthespac

3、ecraftautonomouscontrolandtheexistingproblems.Themainresearchcontentsandresultsareasfollows:Accordingtothereal-timerequirementsforthealgorithmfromthespacecraftautonomousdiagnosistechnique,theseparationstrategyofconflictrecognitioniscarriedoutandthecalculationmethodofanalyticalredundancyisputforw

4、ard,thatmakesthemaincalculationoftheconflictrecognitiontobecompletedintheofflinephase.Meanwhile,thestatememorymechanismwhichintroducesthehistoricaldiagnosisresultisresearchedinthecandidategenerationprocessinordertoavoidunnecessarycomputation.Applyingthediagnosisframeworktoaprimaryelectricalpowe

5、rsystem,andcomparedwithtraditionalmethods,itisverifiedthattheproposedmethodcaneffectivelyimprovetheefficiencyofdiagnosis.Inordertoimprovetheaccuracyofthediagnosissystem,thestructureofthetransitionsystemmodelandtypesofthediagnosticknowledgearestudied.Byintroducingthecausalitydiagnosisknowledgeint

6、othemodelandusingthehierarchicalstructuretoorganizethediagnosisknowledge,thehierarchicaltransitionsystemmodelandthecorrespondingdiagnosismethodareproposed・Whendiagnosingthroughthismethod,thecausalitydiagnosisknowledgeisusedtoimprovethethecompletenessofthemodelandguidethereasonprocessinordertored

7、ucethestatematchingspace,anditwillcausetheimprovementoftheefficiencyofdiagnosis,theaccuracyandtheresolutionofthediagnosisresult.Applyingthismethodtothetelemetryandcommandsubsystemofasatellite,theaccuracyofthediagnosisandeffi