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车辆动力系统扭振分析与测试.docx

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车辆动力系统扭振分析与测试 Introduction Vehiclepowertrainsystemsareresponsiblefortheproductionandtransmissionofmechanicalpowerfromtheenginetothewheels.Intheproperfunctioningofthissystem,thephenomenonoftorsionalvibrationisapossibleproblemthatneedstobeaddressedtopreventdamagetothedrivetrain,transmission,andothercriticalcomponents.Thispaperaimstodiscusstorsionalvibrationanalysisandtestinginthecontextofvehiclepowertrainsystems. TorsionalVibrationsinVehiclePowertrains Torsionalvibrationsareanaturalphenomenoninherentinanyrotatingmechanicalsystem.Itistheoscillationofarotatingshaftthathappenswhenitundergoessuddentorquefluctuations.Apowertrainsystemissubjectedtoseveraltorquefluctuationsdependingonhowthevehicleisbeingdriven,speed,andotherfactors.Whentheinputtorqueismoreorlessthantherequiredtorque,theengineortransmissioncompensatesforit,andthiscompensationleadstotorsionalvibrations. Torsionalvibrationscancauseseveredamagetothepowertrainsystemifit'snotresolved.Thecriticalcomponents,suchasthetransmission,crankshaft,drivetrain,andothercomponents,canbecomedamagedovertime.Topreventthesedamages,engineersmustperformtorsionalvibrationanalysisandtestingtomitigateanyoccurrences. TorsionalVibrationAnalysis Torsionalvibrationanalysisisacomprehensivemethodthatutilizessimulationandmodelingtechniquestopredicttheamountoftorsionalvibrationthatoccursinapowertrainsystem.Theanalysisbeginswithidentifyingthesourcesofexcitation,suchasenginefiringorder,roadsurface,anddriverinputs.Then,thesystem'sstructuralelementsaremodeledtopredictthetorsionalvibrationmodes.Themodelsconsidervariousparameterssuchasstiffness,damping,andinertiasoftheselectivecomponents. Torsionalvibrationanalysislocatestheresonancesorcriticalspeedsofthesystem,wheretorsionalvibrationoccurs,leadingtoseveredamage.Oncethesecriticalspeedsareidentified,engineerscanoptimizethesystem'sdesigntoavoidexcitingtheresonances.Theoptimizationprocessinvolvesdesigningthesystemtoshiftthefrequenciesoftheresonancesoutsideoftheoperatingrangeofthevehicle. TorsionalVibrat