車輪多邊形化對直線電機車輛動力學(xué)行為的影響.pdf

1、西南交通大學(xué)碩士學(xué)位論文車輪多邊形化對直線電機車輛動力學(xué)行為的影響姓名：李玲申請學(xué)位級別：碩士專業(yè)：載運工具運用工程指導(dǎo)教師：金學(xué)松20100601西南交通大學(xué)碩士研究生學(xué)位論文第1I頁Abstractnlepolygonalphenomenonofrailwayvehiclewheelsisoftencalledwheelcorrugation，wheelharmonicweal“orwheelperiodicoutofroundne

2、ssThisproblemarisesfromordinarytrainstohighspeedtrainsnlemechanismofthisphenomenonhasnotbeenexplainedperfectlyuntilnow，andithasbecomeoneofthemostdifficultproblemsofwheel—railsystemtobesolvedThepolygonalwheelscauseafierce

3、vibrationofthevehicleandtrackandseveredamagetobothtrackandvehiclecomponents，suchassleepers，rails，wheelsetsandbearingsTheyalsoleadtoincreasingimpactandrollingnoiselevelsandtodiscomfortforpassengersowingtohi曲vibrationampli

4、tudesTherefore，itisvaluabletohaveaninsightintothedynamicinfluenceofpolygonalrailwaywheelsonthevehiclesandtracksInthisthesis，basedonthevehicle—trackcouplingdynamicstheoryandwheelrailrollingcontacttheory，theinfluenceofpoly

5、gonalwheelsofsubwaysLIMtrainondynamicbehaviorofvehiclealeinvestigatedthroughthenumericalsimulation(1)111isthesisanalyzesthedataofpolygonalwheelsatthedifferentweal“stagesfromthesitemeasurements，andtheexperimentallawsofthe

6、polygonalwheel(2)Thisthesisdevelopsacouplingdynamicsmodelforalinearinductionmotor(LIM)vehicleandaballasttracktoinvestigatetheinfluenceofthepolygonalwheelsofthevehicleonthedynamicbehaviorofthesystemInthemodel，thevehicleis

7、modeledasamultibodysystemwith35degreesoffreedomneHertziancontacttheoryandtheShenHedrickElkins’modelaleutilizedtodeal晰t11，respectively，thenormaldynamicforcesandthetangentialforcesbetweenthewheelsandtherailsInordertobeRerc

8、haracterizetheLinearMetroSystem，EulerbeamcalculatedbymodalsuperpositionmethodisusedtomodelLIMandI沖n鹼verticalelectricmagneticforceandthelateralrestoringforcebetweentheLIMandRParealsotakenintoconsideration，nleformerhasgapv

9、aryingnonlinearcharacteristics，whilstthelatterisconsideredasaconstantrestoringforceof1KNATimoshenkobeamisusedtomodeltherailswhicharediscretelysupportedbysleepersInthetrackmodel，thesleepersaremodeledasrigidbodyaccountingf

10、oritsvertical，lateral，rollingmotionsandassumedtomovebackwardataconstantspeedtosimulatethevehiclerunninggongthetrackatthesamespeedThebailastbedisreplacedwithequivalentmassesonlyaccountingfortheirverticalmotion111emotionof

11、thesubgradeisignored，nlenumericalanalysisconsiderstheeffectoftheexcitationofthepolygonaiwheelsatthedifferentwearstagesonthedynamicbehaviorofthesystem，inwhichtheuseddataregardingthepolygonalwearofthewheelsarefromthesiteme

12、asurementsnledynamicsmodelisusedtoanalyzewheelrailimpactloadingcausedbypolygonalwheelunderdifferentoperationconditions(3)TheresearchactualitiesofmechanicsofballastlesstrackinthepastandnOWareoverviewedThisthesisdevelopsac