基于邊界元法的高速鐵路混凝土箱梁振動聲輻射-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謝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西南交通大學碩士研究生學位論文第1II頁目錄第1章概述?????????????????????????????．．11．1研究背景????????????????????????????。11．1．1問題的引出???????????????????????????l1．1．2鐵路噪聲源組成??

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