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1、ASUMMARYREVIEWOFVIBRATION-BASEDDAMAGEIDENTIFICATIONMETHODSScottW.Doebling,CharlesR.Farrar,andMichaelB.PrimeEngineeringAnalysisGroupLosAlamosNationalLaboratoryLosAlamos,NMABSTRACTThispaperprovidesanoverviewofmethodstodetect,locate,andcharacterizedamageinstructuralandmechanicalsystemsbyexaminingcha
2、ngesinmeasuredvibrationresponse.Researchinvibration-baseddamageidentificationhasbeenrapidlyexpandingoverthelastfewyears.Thebasicideabehindthistechnologyisthatmodalparameters(notablyfrequencies,modeshapes,andmodaldamping)arefunctionsofthephysicalpropertiesofthestructure(mass,damping,andstiffness).
3、Therefore,changesinthephysicalpropertieswillcausedetectablechangesinthemodalproperties.Themotivationforthedevelopmentofthistechnologyispresented.Themethodsarecategorizedaccordingtovariouscriteriasuchasthelevelofdamagedetectionprovided,model-basedvs.non-model-basedmethodsandlinearvs.nonlinearmetho
4、ds.Themethodsarealsodescribedingeneraltermsincludingdifficultiesassociatedwiththeirimplementationandtheirfidelity.Past,currentandfuture-plannedapplicationsofthistechnologytoactualengineeringsystemsaresummarized.Thepaperconcludeswithadiscussionofcriticalissuesforfutureresearchintheareaofvibration-
5、baseddamageidentification.INTRODUCTIONTheinterestintheabilitytomonitorastructureanddetectdamageattheearliestpossiblestageispervasivethroughoutthecivil,mechanical,andaerospaceengineeringcommunities.Forthepurposesofthispaper,damageisdefinedaschangesintroducedintoasystem,eitherintentionalorunintenti
6、onal,whichadverselyeffectthecurrentorfutureperformanceofthatsystem.Thesesystemscanbeeithernaturalorman-made.Asanexample,ananti-aircraftmissileistypicallyfiredtointentionallyintroducedamagethatwillimmediatelyaltertheflightcharacteristicsofthetargetaircraft.Biologicalsystemscanbeunintentionallysubj
7、ecttothedamagingeffectsofionizingradiation.However,dependingonthelevelsofexposure,thesesystemsmaynotshowtheadverseeffectsofthisdamagingeventformanyyearsorevenfuturegenerations.Implicitinthisdefinitionofdamageisthatthec
