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1、天津大學碩士學位論文車橋耦合振動影響因素研究及隨機振動分析姓名：霍學晉申請學位級別：碩士專業(yè)：橋梁與隧道工程指導教師：劉習軍20070601ABSTRACTWiththeconstantimprovementofrunningspeed，increasingoftrafficdensityandthegradualaugmentoftheload，dynamicforceinteractionbetweenvehicleandstructureismoreandmorecrucial，especiallyforbridgestructure．Thedynamicresponseof
2、thevehicleandbridgeismoreimpetuouswhenthebridgeisimpactedbytherunningvehicleonitbecauseofbridge’Scharacteristic，forexample，thewiderspanandthelowerrigidity．Ontheotherhand，thevibrationofbridgecausedbyvehiclealsoaffectsthevibrationofvehicleatthesametime，thesafetyandsteadinessofmovementiSweakened，
3、SOtherelationformsthevehicle—bridgecouplingvibration．Thisissueofvehicle-bridgecouplingvibrationisextremelycomplicatedbecausetheinteractionalcourseisrandom，variationalasthetimeandnonlinearinstructureandmaterial．Firstly,inthisarticleanewvehicle-bridgemodelisconstructed，thismodelisadimensionaland
4、a11．sidedoneincludingvehicle，bridgeandthewheel-railinteraction，itaccordswiththeactualsystemmoresince也eelastictouchmentofwheel·trackiSaddedin．onthebasisofthismodelthevehicle’Sdynamicformulaandbridge’Sfiniteelementaldynamicformulaaresetup，thevehicle’Smodelhasthirty-oneDOFsandallwheels’DOFshaveno
5、relationswithbridge’Sones，whichisdifferentwiththeoldmodel．Then，wesetupthedynamicformulaofthewholesystemaddinginwheel．ffackforce．ProvidedthattrackirregularityisanastationaryergodicGaussianrandomprocess，aseriesofsampleissimulatedinsteadoftheactualprocessandwemustassurethatitislongenoughintimedom
6、ain．Thus，weinputthesampletothevehicle-bridgesystemandusethecompilercomputationalproceduretOobtaintheresultofdynamicresponsethroughthenumericalintegrationmethod．Themassmatrix，dampmatrixandrigiditymatrixinthedynamicformulaofthevehicle-bridgesystemchangefrequentlyasthetime，inotherwords，theyareall
7、temporalfunction，inaddition，theformofmatrixesandthepositionofnonzeronumberalsochangeaccordingly,whichresultinthatateverynewtime，thematrixesiscomputedandparsedrenewedly．Thiscourseshowstheessenceofvehicle—bridgecouplingvibrationandthechar
