地铁车辆车轮椭圆问题研究

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1、西南交通大学硕士学位论文地铁车辆车轮椭圆问题研究姓名：鲍火英申请学位级别：硕士专业：车辆工程指导教师：罗世辉20071101西南交通大学硕士研究生学位论文第Ⅱ页AbstractBasedontheproblemsexistingOllcertainsubwayline2，invehiclessystemdynamicspointofview,researchesarecarriedoutonthephenomenaofeasywheeltreadspalling,wheelellipsationandsevereverticalvibrationofcarbody．

2、Aimatthephenomenonofbadverticaldynamicbehaviorofthesubwayline2vehicles，comprehensiveanalysishasbeencarriedoutonthevehicledynamicbehavior．Andoptimizationhasbeenperformedollthecriticalparametersrelatingtothewheelellipsation(themainestimationindexisthelongitudinalvibrationofwheels)andvehi

3、clevibration．皿etwomainparametersare．"composedIongitudinalstiflhessoftractiondeviceandcomposedlateral(andIongitudinal)stiffnessofin'stsuspension．Dynamicanalysisshowsthat，whenthereisverticalshockexcitation，shorttractionrodmakestheverticalvibrationaccelerationofvehicleendincreaseabout50％i

4、ncomparisontothecaseoflongtractionrodorwithouttractionrod；whensuddenbrakingortractionisappliedonvehicle，shorttractionrodalsomakesvibrationaccelerationofvehiclesincreasesignificantly．Sincefrequentandlongtermbrakingisappliedonsubwayvehicles，venicaivibrationofvehiclesoftenkeepsMghlevel．11

5、1ccalculationresultsarethetheoreticalevidencestousethelocalizeddevicestoreducethewheelellipsationproblemof11lcsubwayline2．nctwosolutionsareconsideredcriticaltosolvetheproblems．Online2thewheeleilipsationproblemisassociatedwiththebigverticalvibration，i．e．asforline2vehicles，smallellipseon

6、wheelwillincreasevehiclevibration．andincreasedvehiclevibrationwilImakewheelellipsedevelopfurthermore，andleadstofrequentwheelreprofiling．Sowhat’simportantistoreducetheassociationlevel．nccalculationresultcannotyetprovidedirectevidencetoapprovethatthewheelout-of-roundnessiscausedbyshorttr

7、actionrod，nortoavoidtheassociationbetweenthem，butthenegativeinfluenceofbigconnectionstiffuessofshorttractionrodisobvious．Keywords：Subwayvehicle；wheelellipse；dynamics；tractionrod；longitudinalstiffness西南交通大学硕士研究生学位论文第1页1．1车轮损伤概述第1章绪论铁路车轮是列车运行的关键部件之一，它与钢轨、车轴并称为铁路3大安全部件111。随着我国铁路高速重载化的进行