横风中复线路堤上高速列车气动性能和运行安全性分析

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1、西南交通大学硕士研究生学位论文第1I页AbstractTheaccidentsoftrainsblownawayfromtrackoroverturnedbystrongwindhavehappenedmanytimesintheworld．Withtheincreaseoftrainspeed，strongwindhasbecomeabigandchiefobstacletotherunningsafetyofhigh-speedtrain．Astheaerodynamicperformanceofhigh·-speedtrainondouble·-trackemba

2、nkmentisverypoorincrosswind，theproblemofrunningsafetyisveryserious．Therefore，itisnecessarytostudytheaerodynamicperformanceandtherunningsafetyofhigh—speedtrainincrosswindindetails，whenitisrunningondouble—trackembankment．Thestudyofaerodynamicperformanceandsafetyoftrainincrosswindisbrieflyr

3、eviewedatfirst．Basedonthecomputationalfluiddynamics，athree—dimensionalaerodynamicmodelofhigh-speedtrainrunningonadouble-trackembankmentundercrosswindconditionissetup．Thecorrespondingtrainsystemdynamicmodelisestablishedonthebasisofmultirigid—bodysystemdynamics．Theflowstructurearoundthetra

4、inandthepressuredistributiononthesurfaceofthetrainareshowed．Influencesofthetrainspeed，crosswindspeedandheightofembankmentontheaerodynamicperformanceandtherunningsafetyofhigh—speedtrainisstudied．Theaerodynamicperformanceandtherunningsafetyofhigh-speedtrainonthewindwardtrackofembankmentare

5、comparedwiththoseontheleewardtrack．Besides，thecomparisonbetweentwodifferentconfigurationaltrainsiscarriedout．Theinfluenceofcrosswindontherunningbehaviourofhigh-speedtrainisinvestigated．Theeffectsofaerodynamicforcesonrunningsafetyarecompared．Therunningsafetiesofhigh-speedtrainareinvestiga

6、tedwithandwithoutconsideringtheinclinemomentandtheyawmoment．Thecriticalsafetyrunningspeedincrosswindisdeternimed．Numericalresultsshowthattheaerodynamicperformanceandtherunningsafetyofhigh—speedtrainincrosswindsarebasicallycontrolledbytheheadcar．Withtheincreaseoftrainspeed，crosswindspeed，

7、embankmentheight，theaerodynamicperformanceandtherunningsafetybothbecomepoor．Whenthehigh—speedtrainistravellingonthewindwardtrack，theaerodynamicperformanceandtherunningsafetyarebetterthanthoseontheleewardtrack．Withtheincreaseofcrosswindspeed，differencesoftheaerodynamicperf