横风中高速铁路声屏障对列车气动性能和动力学性能影响分析

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1、西南交通大学硕士研究生学位论文第1I页车速度的增大，列车运行安全性逐渐变差。不宜在横风较大的路堤区段架设3m以上高度的声屏障；高架桥区段声屏障高度则不宜超过3．5m。关键词：高速列车：声屏障；气动性能；动力学性能；横风西南交通大学硕士研究生学位论文第1II页AbstractWiththerapiddevelopmentofhigh-speedrailwayandtheincreaseoftrainspeed，therunningsafetyandnoisepollutionofhighspeedtrainareconce

2、rnedincreasingly．Inordertoreducethenoisepollutioninducedbyhighspeedtrain，noisebarrieriswidelyusedinmodernhighspeedrailwayengineeringathomeandabroad．Incrosswindcondition，noisebarrieralsoactsaswindbreakwall．Withnoisebarrierequipped，trainsareprotectedtoacertainexten

3、tincrosswindcondition，butnoisebarrierchangestheflowstructurearoundthetrain，affectstheaerodynamicperformanceanddynamicperformance．Theheightofnoisebarriermavafleettherunningsafetyoftrain．Hence，itisnecessarytostudytheinfluencelawofnoisebarrieronaerodynamicanddynamic

4、performanceofhighspeedtrain，toprovidesomereferenceforthedesignofnoisebarrierandrunningsafety．Thedevelopmentsituationsofhighspeedrailwayandnoisebarrierathomeandabroadaresummarizedatfirst．Thestudy011runningsafetyincrosswindconditionandnoisebarrierisreviewedandsomed

5、isadvantagesarepointed．3Daerodynamicmodelsofhighspeedtrainrunningonembankmentandviaductequippedwithnoisebarrierarebuilt(differentheightnoisebarriermodelsareseparatelybuilt)basedonaerodynamictheory．Correspondingtraindynamicmodelsarebuiltbasedonmulti—bodydynamics．F

6、lowstructures，aerodynamicanddynamicperformanceswithandwithoutnoisebarrierarecompared，separatelyonembankmentandviaduct．ThechangelawsofaerodynamicanddynamicDerformanceswiththeincreaseofnoisebarrierheightarestudied．Numericalanalysisshowsthat：turbulencesformonbothsid

7、esofthecarbody，andnegativepressureformsintheseareas．Thenegativepressureareaformedbe：tweenthewindwardsideofcarbodyandnoisebarriermayproducesideforcea2ainstthewinddirection．Differentturbulencesareformedindifferentcases·Onembankmentandviaduct，theaerodynamicforcechan

8、geswiththeincreaseofnoisebarrierheight．Thechangerangeofheadcaristhelargest，itssideforceandrollingmomentreduceswithinacertainrangeofheight．Withtheincreaseofheig