Feature_extraction_of_AE_characteristics_in_offs... .pdf

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1、Measurement44(2011)46–54ContentslistsavailableatScienceDirectMeasurementjournalhomepage:www.elsevier.com/locate/measurementFeatureextractionofAEcharacteristicsinoffshorestructuremodelusingHilbert–HuangtransformLiLin⇑,FuleiChuDepartmentofPrecisionInstruments,Tsingh

2、uaUniversity,Beijing100084,People’sRepublicofChinaarticleinfoabstractArticlehistory:ThispaperaddressesanapplicationofrecentlydevelopedsignalprocessingtoolbasedontheReceived19November2009Hilbert–Huangtransform(HHT)tocharacterizetheacousticemission(AE)signalsrelease

3、dReceivedinrevisedform24July2010fromtheoffshorestructuremodel.TheAEsignalsfromthecracksintheweldedsteelnodesAccepted1September2010oftheoffshorestructuremodelarecollectedduringthetensiletestinginwaterandthesim-Availableonline7September2010ulatedAEsignalsarealsocoll

4、ectedintheoffshorestructuremodel.InstantaneousfrequencyandenergyfeaturesbasedonlocalpropertiesoftheAEsignalsarethenextractedusingtheKeywords:Hilbert–Huangtransformmethod.InordertodemonstratetheadvantageoftheAEfeatureAcousticemissionextractiontechniquesbasedonHilbe

5、rt–Huangtransform,theconventionalAEanalysisisOffshorestructureHilbert–Huangtransformalsoprovidedside-by-sideforcomparison.TheresultsverifythatthemethodbasedonFeatureextractionHHTbettercharacterizestheAEsignalsthantheclassicalAEtechniques.ItcanbeconcludedthattheAEs

6、ignalanalysisbasedonHHTisaneffectivetooltoextractthefeaturesandthisopensperspectivesforcrackrecognitioninoffshorestructures.Ó2010ElsevierLtd.Allrightsreserved.1.IntroductionAEeventsofoffshoresteeltubularT-jointbytheirmostsignificantparameterssuchaspeakamplitude,ene

7、rgy,Acousticemission(AE)monitoringispotentiallyapowerfulduration,rise-time,intervalduringexperimentalstudyofmethodforcrackdetectioninthefixedoffshorestructures[1].acousticemissionmonitoringforcrackpropagationintheItdetectsandprovidesinformationongrowingcracksundero

8、ffshoresteeltubularjoint.Rogersetal.[4]usedthe32-serviceloadingandenvironmentalconditions,whichisrelatedchannelDE1032Dcomputerizedsourcelocationsystemdi