高速鐵路聲屏障空氣動壓力數(shù)值模擬與分析.pdf

1、西南交通大學(xué)碩士學(xué)位論文高速鐵路聲屏障空氣動壓力數(shù)值模擬與分析姓名：伍志英申請學(xué)位級別：碩士專業(yè)：流體力學(xué)指導(dǎo)教師：柳葆生20100501西南交通大學(xué)碩士研究生學(xué)位論文第1I頁AbstractTheBeijing—Shanghaihigh—speedrailwayasallimportantprojectof“l(fā)ongtermrailwaynetworkplan”，representsatotallen=nhof1318kmItisde

2、signedaccordingtoatopspeedof350kmperhourforthewholewaythenlastsonly5hoursforadirectarrivalfromBeijingtoShanghaiWhilethemoreseriousproblemofnoisepollutionwillbeencounteredwiththeelevationofspeedTheactualtechnologyofnoiseb

3、arriersforurbanroadscannotsatisfiestherequirementsofBeijingShanghaihighspeedrailwayAccordingtotheexperiments，theactualsoundbarrierscanwithstandthespeedoftrainsupto200kilometersperhourwithouttroubleWiththespeedhigherthan2

4、50kilometersperhouritappearsthesignificantvibrationinnoisebarriersToensurethesafeworkofnoisebarriers’structuresforthetrainsinhi曲speedcirculation，itneedsnotonlythegoodpropertiesforsoundabsorptionandnoisereduction，butalsot

5、hedynamicperformanceforstructuralrequirementsThepresentpaperfocusOntheresearchandnumericalsimulationofdynamicairpressureactedonthenoisebarriersforhighspeedtrainsBackgroundoftheresearchisthemajorprojectofChineseMinistryof

6、Railway，‘ExperimentalResearchontechnicalmeasurementsforthedynamicairactionsonnoisebarriersofBeijing—Shanghairailway”Theworkisbasedonthefundementaltheoriesofcomputationalfluidmechanics(CFD)，bymeansoftheplatformsofGABITfor

7、geometricalmodelingandFLUENTforanalysisThethree—dimensionalmodelforthestateoftraintotallyinthesoundbarrierisbuiltfirstThenstudiesaremadeonmeshofthemodel，themodelofturbulence，boundariyconditionsandthesettingupandselection

8、oftheinvolvedparametersBymeansofthecomputationalanalysis，distributionofthepressurefield，velocityfield，linesoftheflowtrace，dynamicairpressureintheflowareobtainedTheresultsarecomparedwiththeexperimentalmeasurementstojustif

9、ycorrectnessofthesimulationresultsThentheeffectivepressuresupportedbythesoundbarriersarecalculatedforseveraldifferentworkingconditionsofthetrainandsoundbarriersAndtheempiricalformulasareconcludedfortheloadingpropertiesan