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1、兰州交通大学毕业设计(论文)TheFutureTGVThisisasummaryoftheresearchanddevelopmentcurrentlygoingintotheTGVprogram.MuchofitrevolvesaroundtheTGVNGinitiative,thenextstepinFrenchhighspeedtraintechnology.Thenewresearchwasinitiatedbythehighspeedtestrunsof1989and1990,whichshowedthatitwouldbeworthwiletoexplor
2、ethepossibilityofrunningtrainsatspeedsbetween350km/hand400km/h.Theofficialproject,ledbySNCFandGEC-Alsthom(nowALSTOM,themaincontractorfortheTGV),waskickedoffon31May1990,justtwoweeksaftertheworldrecordrun.Thecostofthefirstfiveyearsoftheprogramwas535millionFrenchfrancs(about100millionUSdol
3、lars),ofwhich55%wasprovidedbyGEC-Alsthom(nowALSTOM),28%bytheFrenchgovernment,and17%bySNCF.TheaimoftheprogramwastohaveaprototypeTGVNGpowercarontherailsbytheyear2000;itwastobebuiltaspartoftheTGVDuplexbuild,intheformofasparepowercar.ALSTOMsuspendeddevelopmentontheTGVNGin1999,concentratingi
4、nsteadonanewEMUtrainsetdesignwithdistributedpowerratherthandedicatedpowercars.ThistrainisexpectedtoincorporatetheresearchthatwentintotheTGVNGandwillhavethesameoperatingspeedof360km/h.Thisandotherresearchprojects(tiltTGVsandshortTGVs)aimtoremoveseveralkeytechnologicalandoperationalbarrie
5、rstohigherspeedsandespeciallytoloweroperationalcosts.Somekeypointsaredetailedbelow.·Braking·TractionEquipment·WeightReductionBrakesCurrentTGVtrainsetsusethreebrakesystems:disks,dynamicbrakesonpoweredaxles,andinsomecasestreadbrakesforemergencies.Forspeedsof350km/handmore,theseconventiona
6、lbrakeslosetheirabilitytostopatraininareasonabledistanceandcannotperformasafeemergencystop.Thebasicproblemissimple:kineticenergy,whichmustbedissipatedasheatinthebrakingsystem,growsasthesquareofspeed.Brakingisthereforeamajortechnologicalhurdle,whichmustbeovercometosafelyattainhigherspeed
7、sinrevenueservice.7兰州交通大学毕业设计(论文)SomepreliminaryideasareappliedtotheTGVDuplex,thebilevelTGVintroducedattheendof1995.Theseconstituteafirststeptowardshigherperformancebraking.ForthisthirdgenerationTGV,dynamicbrakingperformanceisimprovedfrom24kNperpoweredtruckto30kN,asmeasuredinre