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ID:36377623
大小:3.30 MB
页数:85页
时间:2019-05-10
《车桥耦合振动影响因素研究及随机振动分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
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