车桥耦合振动影响因素研究及随机振动分析

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1、天津大学硕士学位论文车桥耦合振动影响因素研究及随机振动分析姓名：霍学晋申请学位级别：硕士专业：桥梁与隧道工程指导教师：刘习军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