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1、大連理工大學(xué)碩士學(xué)位論文基于局部振動(dòng)的梁類結(jié)構(gòu)動(dòng)力檢測(cè)方法研究姓名：劉澤申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：防災(zāi)減災(zāi)工程及防護(hù)工程指導(dǎo)教師：周晶20040601摘要AbstractForlarge—scalestructures，itisverydifficulttosimultaneouslyidentifythelocationandextentofelement—leveldamagebyusingofthelimitedmodalmeasu

2、rements，whichoftenleadstowrongresultsofdamageidentificationThemethodologywhichiscomposedbytheglobalidentificationandlocalidentification，isalleffectiveapproachtoidentifythestructuraldamageincomplexstructuresInthedissertat

3、ion也elocaldamageidentificationofbeam1ikestructuresiSstudiedwithmodalmeasurementsbasedonlocalvibrationThemaincontentsofthedissertationarelistedasfollowsFirstlythedifferentialequationsoflateralbendingfreevibrationofEularBo

4、moullimodelandTimoshenkemodelarebuiltFrequencyequationsoftwodifferentbeamsarethenderivedwithelasticrotationconstraintsatsupportsAccordingtothegivenboundaryconditionstllenaturalfrequenciesofthebeamsareobtainedSecondlythem

5、ethodtoidentifythefiexuralstiffnessandboundaryconditionswiththefrequenciesisproposedThefeasibilitytoidentifythestiffnessandboundaryconditionssimultaneouslyiSdiscussedTheaccuracyoftheproposedmethodandtheeffectsofmeasureme

6、nterrorsarealSOstudiedItcanbeconcludedthatatleast3frequenciesareneededtoidentifytheflexuralstiffnessandboundaryconditionsinthecaseofbeamwithdifferentconstraintsatsup口ons。andatleast2frequenciesareneededinthecaseofbeamwith

7、sanleconstraintsatsupportsThenumericalsimulationsalSOshow曲atthefdentificationresuRsofflexuralstiffnesshavehighaccuracy嚙an曲oseofboundaryconstraints，whichrequiresthemoreaccuratemeasurementsoffrequenciesItiSnotedthatidentif

8、icafionaccuracyofthebeamwithstrongconstraintsiSmoredependentonmeasurementaccuracyespeciallyinthecaseofthehighfrequenciesFinallylocaldamagelocalizationbasedondynamicsignaturesispresentedTheapplicabilityofthreedynamicsigna

9、turesbasedfrequencydataarestudied，andthenumericalsimulationsofdifferentdamagecasesarecarriedoutTheresultsdemonstratethatthenormalizedchangeratiooffrequencyisstableaschangingthedamagelocationandextentTherefore，恤enormalize

10、dchangeratiooffrequencyiSselectedasdynamicsignatureofbeam—likestructuresbasedonlocalvibrationTheeffectivenessoftlledamagelocalizationbyusingoftheproposeddynamicsignatureisillustratedbyanumericalexampleKeyword：beam；dynami

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