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400km/h 운행 최적 시범구간 선정을 위한 주행성능해석
정흥채(Heungchai Chung),엄기영(Kiyoung Eum),윤장호(Jang-ho Yun) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
In Korea the HEMU-400X(High-speed Electric Multiple Unit-400km/h eXpress) has been developed since 2007 and will be operated over 400km/h in 2013. It is necessary to prepare test-bed section in Honam high-speed railroad to take the maxim running speed test for the HEMU-400X developed. In order to determine proper test-bed sections for the maximum speed of 400km/h TPS(Train Performance Simulation) program with the data of train model running resistance traction power and braking capacity was used to analyze the train performances such as locations speeds and power consumptions by times. In this study the specifications of the HEMU-400X project and the route conditions of the Honam high-speed railroad under construction were utilized for the TPS program to determine the optimal test-bed sections for the maximum speed of 400km/h.
정흥채(Chung Heungchai),엄기영(Eum Kiyoung),김석원(Kim Sukwon),서정원(Seo Jungwon),신종한(Shin Jonghan) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
A field of test and evaluation plays an important role in railway system in the safety and reliability aspects. In this paper, test and evaluation items for various railway systems i.e., conventional railway system, tilting system, and high speed railway system, were compared to analyze characteristics of the systems.
미국철도협회의 차륜/레일 접촉상태 차상 자동검측 기술 개발 현황
정흥채(Chung Heungchai) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
The geometry of wheel and rail profiles is the primary contributor to wheel and rail interaction. These profiles interact to influence truck steering, vehicle lateral stability, wheel/rail wear and surface damage. Maintaining good control of the profiles is one of the keys to ensuring preferred wheel and rail interaction. Transportation Technology Center, Inc., Pueblo, Colorado, is developing an automated measurement system for wheel/rail contact condition inspections supported by AAR(Association of American Railroads). The system uses a modified version of WRTOL<SUP>TM</SUP> (Wheel/Rail Tolerances)--software that performs extensive analysis of wheel and rail contact conditions
터널로 진입하는 고속 전철에 의한 공력 변화가 고속 가선계에 미치는 영향 분석(Ⅰ)
조용현(Yong Hyeon Cho),정흥채(Heungchai Chung),권혁빈(Hyeok-Bin Kwon) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
When a high speed train enters a tunnel, wind speed passing through the train in a tunnel section becomes higher due to the reverse flow to the direction of the train. The higher wind speed gives more aerodynamic forces to the pantograph on the train. Therefore, it is necessary to perform aerodynamic and dynamic analyses in order to check whether the current collection of the high speed train, entering the tunnel, still remain permissible or not. In this paper, the aerodynamic analysis has been performed under the assumption that a high speed train at 300 ㎞/h enters a tunnel whose cross sectional area is 107㎡ and length is 1000m. In consideration of the aerodynamic analysis results, the dynamic analysis has been performed based on the catenary and pantograph dynamic models in SEOUL-PUSAN high speed rail, using the GASENDO developed by RTRI. In addition, the fatigue life of the contact wire has been reviewed using the Goodman diagram. Based on the analysis results, it is concluded that the increase of the aerodynamic forces on the pantograph in the tunnel section shall not affect characteristics of current collection adversely except that motions of the pantograph may be constrained by bump-stops.
김재환(Jaehwan Kim),강부병(Bu-Byoung Kang),김형진(Hyeong-Jin Kim),정흥채(Heungchai Chung),최성규(Sung-Kyu Choi) 한국철도학회 2003 철도저널 Vol.6 No.4
Smart materials can adapt to changes of environment like living organs in nature such that they can maximize the performance and minimize the maintenance expense of engineering systems. Such materials have been paid attention ten years ago and applied in the area of industry, aerospace, transportation and civil structures. This paper summarizes smart material technology and shows some application examples in railway vehicles. Also, its future of smart material technology in railway vehicle technology is envisaged based on its possibility and practical aspect.
조용현(Yong Hyeon Cho),이기원(Kiwon Lee),현승호(Hyun Seung-Ho),정흥채(Heungchai Chung) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
A dynamic simulation program for pantograph-catenary system is developed based on a mode superposition method to predict current collection performance. Formulations for the dynamic simulation are presented in this paper. The number of modes which should be considered for a KTX catenary system is reviewed through frequency response analyses. The responses for GPU pantograph - KTX catenary system are simulated with various train speeds. The our simulation results are in reasonably good agreements with RTRI simulation program, SNCF simulation program, and BR simulation program.
400km/h급 Test-Bed 교량 구간 단독주 기초 강도검토를 위한 최대 모멘트 계산
이기원(Kiwon Lee),권삼영(Sam-Young Kwon),조용현(Yong Hyeon Cho),정흥채(Heungchai Chung),박영(Young Park) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Increasing tensions of contact wire and messenger wire are essential to construct a test-bed for catenary system in the 400km/h speed on Honam high-speed railway. Because heavy load is applied to a mast due to the increased the tensions of both wires it is required to investigate the strength of the foundation. Therefore in this study the maximum moment of an electric pole under the worst condition was calculated to investigate the strength of the pole foundation on the bridges. The maximum moment database table used in the construction of Kyungbu high-speed railway was referenced to derive the worst conditions and to review the composition of catenary system in the test-bed section. From the results of this study regarding assumptions and calculation process it will be possible to estimate the optimized strength of the pole foundations on the bridges which will be constructed in the future.
양승용(Seung-Yong Yang),구병춘(Byeong-Choon Goo),정흥채(Heungchai Chung) 한국철도학회 2004 철도저널 Vol.7 No.2
This paper consists of two parts. One is finite element analysis of the redistribution of residual stresses of weld specimen by cutting. This work is necessary to predict the actual residual stress distribution of weld specimens used in fatigue test. The other subject is to calculate the relaxation of residual stress and the strain field induced by cyclic loading. To obtain fatigue life of weldment, the value of strain amplitude at each position is necessary, for example in the strain-life approach, and the numerical results can be used to verify experimental strain measurements. Thermo mechanical finite element analyses were conducted on the commercial package ABAQUS.