基于Bayes和FTA的机床故障推理研究.pdf

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1、机床与液压Sep．2014HydromechatronicsEngineeringVo1．42No．18DOI：10．3969／j．issn．1001-3881．2014．18．002ResearchontheinferenceofCNCmachinefaultbasedonBayesandFTABinSHEN，Yi-shunSU，Shu—yuZHAOTheSino—GermanSchoolforPostgraduateStudies，TongjiUniversity，Shanghai201804，ChinaAbstract：Duetothecompi

2、exityofthefaulttree，thefaulttreewillfirstlybedecomposedtoobtainsub．moduleswithsimilarmodularstructure．andalsothemoduleIibrarywillbebuilttostorethesub—modules．ThispaperwilIintroducethebasicprocessesandprinciplesoffeature-retrievalbasedonmodulelibrary．Inordertoavoidrepetitionretde

3、vaIandNPproblem．theconceptofvalidmodulewilIbeintroduced．thatistonotonlyconsiderthehierarchyrelationshipoftheeventjnfaulttree．butalsoconsidertheafiliationbetweeneacheventwhentraversingmoduleIibrary．Finally，thispaperstudiesanoptimalsortingmethodofimportancebasedonBayesiantheoryand

4、alsomakestheimportancecorrection．Thecorecomponentofthispaperistobuildthemodule¨_brarybasedonthebasicmodularstructure．andalsointroducetheconceptofvalidmoduleaswellasoptimalsortingofimportancebasedonBayesiantheoryontheminimumcutsets．Thepresentstudyresultlndicatesthatthismethodcane

5、fectivelyreducethesolvingsize．acceleratethespeedofdiagnosis，andimprovethecredibilityofimportancesortingaswel1．Keywords：Modularization，Efectivemodular，Faulttree，MinimaIcutsets，TraversafsearchTheapplicationofCNCmachineinmoderncasesarefew．andrule—basedisalwaysstoredinre—manufacturi

6、nghasbecomewidespread．Inpracticaldundantandnon—logical，whichmakestheapplica—production，ifwecanmakerightjudgmenttimelyoftionofFTAbecomeatrend．FaulttreeanalysisisatheCNCmachinefault，ascertainthefaultpart，findgoodmethodtomakesecurityandreliabilityanalysisoutthereasonandremedywithlo

7、wermaintenanceofcomplexsystems，itcanobtaingoodresultinrun—costsandinashortperiod．thenitcouldgreatlyre—ningandmaintainingCNCmachinebyusingthefaultducethemaintenanceblindnessandalsoimprovethetreeanalysistopredictanddiagnosefault[2]．productioneconomyandsecurity[1]．Intheearly1960s．B

8、ell—LabsinAmericanfirstlyusedthe丌A1．Thekeyeleme