Damage Identification Dependence on Number of Vibration ModesUsing Mode Shape Curvature Squares基于振动模态数地损伤识别 利用振型曲率平方.pdf

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1、JournalofPhysics:ConferenceSeriesPAPER•OPENACCESSDamageIdentificationDependenceonNumberofVibrationModesUsingModeShapeCurvatureSquaresTocitethisarticle:RJaneliukstisetal2016J.Phys.:Conf.Ser.744012054Viewthearticleonlineforupdatesandenhancements.ThiscontentwasdownloadedfromIPaddress117.165.41.9

2、9on15/09/2018at12:52MOVIC2016&RASD2016IOPPublishingJournalofPhysics:ConferenceSeries744(2016)012054doi:10.1088/1742-6596/744/1/012054DamageIdentificationDependenceonNumberofVibrationModesUsingModeShapeCurvatureSquares1121RJaneliukstis,SRucevskis,MWesolowskiandAChate1InstituteofMaterialsandStr

3、uctures,RigaTechnicalUniversity,Riga,Latvia2DepartmentofStructuralMechanics,FacultyofCivilEngineering,EnvironmentandGeodeticSciences,KoszalinUniversityofTechnology,Koszalin,Polande-mail:Rims.Janeliukstis_1@rtu.lvAbstract.Inthispaperadamageidentificationalgorithmformultipledamagesitesbasedonmo

4、deshapecurvaturesquaremethodofvibrationmodeshapesinaluminiumbeamisreported.TherequiredmodeshapecurvatureofahealthystructurewasobtainedviainterpolationofmodeshapecurvatureofadamagedstructurewithFourierseriesfunctionsofdifferentorders.Algorithmemployedcalculationsofstandardizeddamageindexdistri

5、butionsoverbeamcoordinate.Finiteelementsimulationsofproposedmethodologyinvolvingvariousartificialnoiselevelsandreductionofmodeshapeinputdatapointswerevalidatedonthedamageidentificationresultsofexperimentallymeasuredmodeshapeswhichweremeasuredusingscanninglaservibrometer.Resultsshowthatthealgo

6、rithmiscapableofcapturingtheareasofdamage.Thetermcalleddamageestimatereliabilitywasintroducedintermsoflikelihoodofthechosenapproximationfunctiontocapturethelocationofdamage.1.IntroductionDesignofmoderncivilandengineeringstructuressuchasautomotiveandaerospacefacilities,stadiums,dams,tunnels,sk

7、yscrapersetc.,requireshigherstandardsofsafetythaneverbefore.Notmeetingtheseobjectivesmayleadtotragicconsequences–lossofhumanlivesaswellasmateriallosses.Toovercomethisproblem,traditionallyrigorousandcostlystructureinspectionprocedurestookplace