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1、PerformanceEvaluationbyFieldMeasurementforSpeed-UpofConventionalTrackinKoreaJu-HwanUm1,Ki-YoungEum1,Young-HwaYou1,In-HoYeo11:ConventionalRailEngineeringCorps.KoreaRailroadResearchInstitute,jhum@krri.re.kr1:ConventionalRailEngineeringCorps.KoreaRailroadResearchInstitute,kyeum@krri.re.kr1:Conventiona
2、lRailEngineeringCorps.KoreaRailroadResearchInstitute,yhyou@krri.re.kr1:ConventionalRailEngineeringCorps.KoreaRailroadResearchInstitute,ihyeo@krri.re.krKoreaRailwayResearchInstitute374-1,Woulam-Dong,Uiwang-City,Kyonggi-Do,KOREA437-050,phone:+82.31.4605683,Fax:+82.31.4605699,AbstractJoong-AngLine,whi
3、chisoneoftheconventionallinesinKorea,wasconstructedoverhalfcenturyago.Alocalimprovementthroughtherepairoftrackandmodificationofalignmenthasbeenmadesofar.Further,theimprovementstrategyforspeedupneedsaperformanceinvestigationoftheconventionallines.Inthispaper,adynamicimpactfactoroftheconventionaltrac
4、kisevaluatedbasedonthedynamicwheelloadmeasuredinthefield.Totaloffourlocationsinthelineareselectedtomeasurethewheelloadsofthefreightandpassengertrains.Anapproximateequationoftrackimpactfactorisderivedbymeansofstatisticalanalysisofmeasuredwheelloadsandcomparedwithempiricalequationsfromvariouscountrie
5、s.ItisfoundthattheproposedequationisequaltotheequationofcontinuousweldedrailtrackinJapanbutlessthantheequationofAREMA.Thereforeitcanbeconcludedthattheconventionaltracksatisfiesthecriteriafordynamicloadcausedbyexistingtrainsandthemoderatelevelofsafetyissecured.KeywordsPerformance,Impactfactor,Wheell
6、oad,Freight,Passenger1.IntroductionRecentmovementtowardaresearchanddevelopmentontherailwaytechnologiesprovokestheadditionalinvestmentandimprovementtotheinfrastructureinKorea[1].ThehistoryofrailwaysinKoreaisnotsolongenoughtohavesophisticatedmanagingandtechnicalrailwaysystem.Thereforemostoftheconvent
7、ionallineshavebeeninpoorstate.Ithasbeenamainreasontocausedecreaseintrainspeedandpassengerssofar.Fortunately,thecommercialoperationofKTX(KoreaTrainExpress)isscheduledonApril,2004.Sinceitsmaximumoperatingspee
