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ID:33762544
大小:12.71 MB
页数:74页
时间:2019-03-01
《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》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
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
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