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1、环境激励下基于小波分析的结构模态参数识别研究AbstractThepaperdiscussestheapplicationofwaveletanalysistheoryinthemodalidentificationunderambientexcitation.First,weextracttheequivalentimpulseresponsesignalfromtherandomresponsebythenaturalexcitationtechnology(NExT)orrandomdecr
2、ementtechnology(RDT).Second,weobtainthemodalwaveletridgesthroughwavelettransformanalysisandrelevantoptimizationmethod.Finally,wefitthewaveletcoefficientscorrespondingtothescalesthatwaveletridgescontainandthenidentifyingthemodalparametersthatincludenat
3、uralfrequencies,dampingratiosandmodeshapes.Inthispaper,theCrazyclimberalgorithmisproposedtoextractthewaveletridge,itisakindofmathematicalstatisticsmethodwhichcanbeusedtoextractmulti-ridges,soitprovidesthebasisforidentifyingthemulti-freedomsystem.Inadd
4、ition,wegenerallyassumetheenvironmentincentivetobewhitenoiseincentivewhendoingoperationalmodalanalysis.Whiletheactualengineeringtestoftenmixedwithsomenon-stationary,impulse,periodiccomponents,whichwouldaffecttheaccuracyofthemodalidentification.Thus,th
5、epaperintroducessomemethodsforsignalstationeriesandproposesanamplitudecurvediagramtoidentifytheperiodicsignal.Thentakemeasurestogetridoftheperiodiccomponents.Duetoedgeeffectproblem,thepaperadoptstheSVMtechnologywhichcandosmallsamplepredictionandcontin
6、uationprocessingfortheoriginalsignal.Finally,inordertoverifyandanalyzethefeasibilityoftheproposedtheory,thepapersimulateacantileverbeamstructurewhichissetintwoconditionsandanalyzedbyERAandwaveletanalysisalgorithmsrespectively.Theresultsshowthatthemeth
7、odcandecoupledensemodesandidentifyaccuracyresults.Ithasagoodreferencevaluefortheengineeringandtechnicalpersonnel.Keywords:Modalparameteridentification,Supportvectormachine,Wavelettransforms,Waveletridges,Edgeeffects,AmbientexcitationII南京航空航天大学硕士学位论文目录
8、第一章绪论............................................................................................................................................1
1.1引言...........................................................................................