轨道车辆车门运行模态分析方法-研究

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1、西南交通大学硕士研究生学位论文第1I页AbstractInrecentyears，thehigh-speedrailwaydevelopesrapidlyinChina,andthenetworkofthehighspeedrailwayhasinitiallytakenshapewithlargecoverageandpositiveeffect．Therailwaylineisupdatingfastandmoreattentionispaidtothesafetyandconditionimprovementinh

2、igh—speedpassengerCar．Itissignificanttoconductstructuraltestofvehicledoorforsafetyandcomfortofpassengerssincetheperformanceofthedoorhasmucheffectsonthesealingandnoisecontrolintherunningtrain．Duetoexcitationofthetrackirregularity，wheel／railcontactandexternalenviro

3、nmentincludingpassingthroughtunnelandvehiclesmeeting，thevibrationstateofthedoorisverycomplicated．Oncetheseriousstructuraldamageevenfallingdownhappensinthedoor，itwouldthreatenthesafetyofthepassenger．Operationalmodalanalysiscouldestimatethemodalparameterswhentraini

4、srunning．Inthisway，itcouldnotonlyprovidethebasisforstructuraldesignandoptimizationbygettingthevibrationcharacteristicsofthedoor，butalsopreventterribleaccidentcausedbythefaultofthedoorbyreceivingthestructuralhealthinformationextractedfromreal-timemodalparameters．T

5、histhesissetupresearchofthemodalparametersestimationmethodforvehicledoorbasedonthewaveletmethod．ThecorecontentofthisthesisiSasfollows，Thefundamentalknowledgeofthemodalanalysisisbrieflyanalyzed，andtheadvantagesanddisadvantagesofexperimentalmodalanalysisandoperatio

6、nalmodalanalysisisresearchedandpresented．Thebasicwavelettheoryisdescribedandmuchemphasishasbeenputintothetime—frequencypropertyofthewavelet．Theselectionofwaveletbaseisalsotakenintoconsiderationsystematically．Bycombinationofenergyandshannonentropy，theenergy—shanno

7、nentropyratioisusedtoselectwaveletbaseformodalanalysis．AndthismethodisverifiedbyGaussianmodulationsignal．Theprincipleofthewavelettransformofthefreevibrationresponsefromlinearstructuresisdiscussedwhichsupportsthemodalanalysistheoretically．Thephysicalmeaningofwavel

8、etridgeandtheridgeextractionispresentedandverified．Usingfiniteelementmethod，themodalparametersofgirderareobtained．Then,thesimulationofenvironmentexcitationtogi