基于边界元法的高速铁路混凝土箱梁振动声辐射-研究

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1、AbstractTherapiddevelopmentofhigh·speedrailwayhasmadethe均ilwaynoiseandvibrationamuchmoreseriousproblem．Bridgenoise,aspartofrailwaynoise，is‘secondradiated’noiseinducedbytrains．Althoughbridgenoisewhichbelongstolowfrequencynoise(

2、ailwaynoise,itisstillnecessarytostudythegenerationmechanismandeffectivenoisereductionmeasuresforthehazardoflowfrequencynoiseandlackofsystematiccountermeasures．Thispaperintendstoinvestigatethelowfi'equencynoiseradiatedfromacommonlyusedtypeofsimplesupportedconcrete西rdcrinducedbyhigh—sp

3、eedtrains．Themajorcontentsofthispapershowasfollows：1)Abriefliteraturereviewisdonetointroducetheresearchstatusandmethodsonrailwaynoise．Thenthenumericalanalysismethodssuchasfiniteelementmethod(FEM)，boundaryelementmethod(BEM)andstatisticalenergyanalysis(SEA)forsoundradiationduetostructu

4、revibrationaresummarizedandcompared．2)AmethodcombiningTrain-Track-Bridge(TTB)interactivetheory谢mBEMisproposedtosolvethetrafficinducedlowfrequencynoisefrombridgestructures．BoundaryintegrationequationbasedonGreenidentityisestablishedforthecalculationofunboundedacousticregion．Basicassum

5、ptionandcalculationprocessoftheproposedmethodcombiningmandBEMisraisedaRerabriefintroductiontotheanalysismethodofTTBinteractivetheory．3)ATTBinteractiveanalysissoftware，BDAP2．0(．BridgeDynamic_AnalysisProgramVersion2．0)developedbySW．JTUisappliedtoinvestigatethedynamiccharacteristicandtr

6、afficinducedresponseofthebridge．Thenthesoundpressurelevel(SPL)ofthesurroundingenvironmentisestimatedbyacommercialBEMsoftware．、4)Parameterstudyismadetofindoutthequalitativerelationshipbetweenbridgenoiseandpossiblefactorssuchassoundbarriers，trainspeed,pierheight，andgroundreflection．key

7、words：high-speedrailway；,soundradiation；lowfrequencynoise；boundaryelementmethod；train-track-bridgeinteractivevibration；concreteboxgirder西南交通大学硕士研究生学位论文第1II页目录第1章概述⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．11．1研究背景⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯。11．1．1问题的引出⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯l1．1．2铁路噪声源组成⋯⋯

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