轨道横向力与纵向力

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1、Chapter28Track-TrainDynamicsProblemLateralForcesHighCenterofGravityCarsVerticalForcesLoadedandEmptyCarsTypesofLateralMovementLateralBendingandBendingStressLateralMovementTiltorTwistLateralPhenomenaTrainActionDerailmentWheelClimbingRailOverturningBrakeAction–assumesstatusofalongandflex

2、iblebeamincompression,arelativelyunstablestateQuicktake-upofslackinalongtraincanalsoexertlateralpressureTrainAction(Cont’d)ReverseCurves“Chording”theCurveTruckHuntingDerailmentCausesOperatingError(Transportation)MechanicalError(Mechanical)TrackError(Engineering)OraCombinationofAbove~C

3、onductRootCauseAnalysis~L/VRatioRatioofthelateralcomponenttotheverticalcomponentofthewheelload.Asratioincreases,tendencytoderailincreasesLateralSlipLoadApplicationBallastSectionDesignL/VTrackRestraintRatioTrackDesignFactorsTrainForcesCarWeightProblemsfromModernCarsRockandRollMorepreva

4、lentonjointedtrackJointsevery19.5feet–inducedoscillationCarbodyspringshavenaturalfrequencyofoscillationAtspeedsbetween12and20mphfrequenciesareadditiveIfsquarejoints–bounceSolutions:Don’tsetsustainedspeedlimitsbetween12-20mphUsesnubbingdevicesoncarsUseCWRRock&RollTruckHuntingLongCarsTr

5、ansportationTechnologyCenterPueblo,ColoradoTestTracksandOtherResearchFacilities