航空发动机气路参数偏差值模型分析与应用

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1、AbstractAbstractAeroengineisregardedasthe"heart"ofaircraft.Toenhanceengineconditionmonitoringnotonlyhelptoimprovethetransportaircraftsafety,butalsotoreduceenginemaintenancecosts.Therearemanyaeroengineconditionmonitoringtechnology.Inallofthem,thegaspat

2、hparametermonitoringtechnologyisveryimportant.Thismethodgetgaspathparameterdeviationthroughparameterdeviationmodel.Andthen,gettheengineperformancestatusaccordingtothetrendofgaspathparameterdeviation.Atlast,forecastgaspathparameterdeviationfor"pre-diag

3、nosis".Obviously,itisnecessarytoresearchonaeroenginegaspathparameterdeviationmodelanditsapplication.Inordertogettheaeroenginegaspathparameterdeviationmodel,thedeviationmodelshouldbebrokendownintothreeparts:thestandardizedmodel,thebaselinemodelandtheco

4、mpensationmodel.Firstly,theengineconditionmonitoringsystemoforiginalenginemanufacturerwereanalyzed,andthefunctionexpressionofthebaselinemodelandthestandardizedmodelwasobtainedbyexperiment.Andthen,thecompensationmodelwasestablishedonSupportvectormachin

5、emethod.Optimizetheparametersofsupportvectormachineswithparticleswarmoptimization.Finally,actualdatawasusedtovalidatethedeviationmodel.Theapplicationshowsthatthemodelerrorissmall,andabletomeettheactualrequirements.Theoriginalvalueofenginegaspathparame

6、terdeviationwhichSNR(SignaltoNoiseRatio)isverylowhasmanyoutlier.Andthetrendsisdifficulttoobserve.It,snecessarytodetectoutlierandsmoothfortheoriginalvalueofdeviation.First,outliersdetectionalgorithmisproposedonsecondexponentialsmoothingmethod.Thentheev

7、aluationindicatorfortheprocessingofdeviation.optimizationmodelforevaluationindicatortooptimizethesmoothingcoefficientandsignificancelevelparameter.Andit'ssolvedwithparticleswarmoptimization.Finally,themethodwasusedtodetectoutlierandsmoothfortheexhaust

8、gastemperaturedeviation.Theapplicationshowsthattheeffectofthismethodisgood.Thepredictionofgaspathparameterdeviationisessentiallyatimeseries-II-Abstractprediction.Firstthetime-varyingfuzzyinferencesystemtheorywasestablished.Andthencreateatime-v