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강체전차선로 고속화를 위한 설계파라미터 민감도 분석 연구
이기원(Kiwon Lee),조용현(Kiwon Lee),권삼영(Sam-Young Kwon),박영(Young Park) 대한전기학회 2017 전기학회논문지 Vol.66 No.2
R-Bar (Overhead Rigid Conductor system) has been lately used for the speed of over 200 ㎞/h in Europe, while it has been developed and used for the max. speed of 120 ㎞/h in Korea. Because R-Bar has advantages of reduction of tunnel cross sectional area and maintenance, its development for more high-speed is urgent in Korea having many mountain area. Therefore a sensitivity analysis of design parameters for the speed-up of R-Bar has performed in this study. For the analysis, we have developed a program for the prediction of dynamic characteristics between a pantograph and R-Bar. The program was evaluated with the actual test result and a current collection performance according to the parameters such as a distance between brackets, a stiffness of bracket and of R-Bar rail was predicted with the program.
전주 위치 설계 지원 프로그램 개발 (I) : 유기적 3차원 설계 기법을 중심으로
이기원(Kiwon Lee),조용현(Yong Hyeon Cho),권삼영(Sam-Young Kwon),이태권(Taekwon Lee) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
The detail design of overhead line can be dievided into a pegging plan and MD(Mounting Diagram) process. A program can perform a MD process was already developed and used in Honam High-Speed project. In this study a pegging plan program which can perform mast distribution automatically is developed. The system is developed based on dot net framework 4.0 and Civil3D 2012 and used spread 4.0 component for grid UI. It can not be directly used a rail horizontal alignment and long-section profile together on drawing. Therefore using Civil3D mathematical alignment and profile of rail can be accomplished. And this program has an advantage of user friendly operation because of close relationship between the two.
이기원(Lee Kiwon),권삼영(Kwon Samyoung),조용현(Cho Yong Hyeon),이태권(Lee Taekwon),이경훈(Lee Kyunghoon) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
A detail design of overhead catenary system can be divided into a pegging plan and a design of MD(mounting diagram). In the pegging plan, the mast location, staggering and tension length are determined in the longitudinal point of view according to track condition, location of substation and etc. In the MD, a transversal diagram including masts, all of wires, cantilever, foundation and etc. and materials used are shown. This study presents a development of a software to design the MD for a conventional catenary system automatically. In the program, thin walled steel pole, foundation, cantilever, all of wires and etc. are automatically drawn according to the input and catenary conditions. And materials used in the MD and the section can be also managed respectively in the program. This application of the program is developed using C# for input/calculating and using C++(ObjectARX) for drafting the MD, respectively.
파동반사와 도플러 효과를 고려한 전차선의 속도향상 설계
조용현(Yong Hyeon Cho),이기원(Kiwon Lee),권삼영(Samyoung Kwon),김도원(Dowon Kim) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
There are many massive components added on the railway overhead-line. These components cause larger fluctuations of contact forces, which are due to wave reflections and Doppler effects when a high-speed train passes those. In this paper, mathematical formula are derived for the relation between the added mass and contact force fluctuations. Using the derived formula, we calculate a added mass on the overhead-line which cause amplification factor to become 2.5. German design practice requires that amplification factor due to the wave reflection should be less than 2.5 to obtain good current collection performance. To show the validity of the formula, simulation results are compared with the calculation results. Simulation results showed that contact force fluctuations grow rapidly when an added mass is larger than the calculation result. Therefore, the simple form of formula can be used for estimating maximum added mass not to cause large fluctuations of contact forces in early design phase.
시속 400km급 전차선로 드로퍼 피로시험 하중 분석연구
조용현(Yong Hyeon Cho),이기원(Kiwon Lee),권삼영(Sam-Young Kwon),박영(Young Park),박철민(Chulmin Park) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.11
팬터그래프가 전차선의 하중을 조가선에 전달하는 드로퍼를 통과할 때 전차선이 압상되면서 드로퍼는 일시적으로 느슨해진다. 열차가 통과한 직후 전차선이 자중에 의하여 낙하하면서 드로퍼에는 일시적으로 큰 동적 장력이 걸리고, 진동과정을 거치면서 감쇠하다가 정적 장력 상태로 수렴하게 된다. 경부고속철도 전차선로에서의 주요 유지보수 작업 중의 하나가 지지점 인근의 드로퍼가 열차 통과에 따른 동하중에 의하여 피로 파괴됨으로써 드로퍼를 교체하는 것이었다. 열차 속도가 300km/h 에서 400km/h 증가하게 되면 드로퍼에는 더 큰 동 하중이 유발될 것으로 예상된다. 시속 400km 급 전차선로에서는 드로퍼동하중을 줄이기 위하여 전차선에 사전이도를 부여하지 않는 것이 바람직하다. 시속 400km 급 전차선로에 적용되는 드로퍼의 피로 성능을 적절히 평가할 수 있는 시험하중 기준을 수립할 필요가 있다. 경부고속철도에서의 드로퍼 장력 측정을 통해 검증한 팬터그래프-전차선 동역학 시뮬레이션을 통하여 시속 400km 로 열차 통과시 드로퍼가 겪게 될 동 하중을 예측한 결과를 기초로 드로퍼의 무한수명을 입증하기 위한 드로퍼의 공장 피로시험 하중으로 300N 을 제안하였다. Droppers by which the weight of a contact wire is carried to a messenger wire become slackened when a pantograph passes under it. After the passage of the pantograph, dynamic tension is abruptly applied to the droppers due to the free drop of the lifted contact wire. .After that, tensions on the droppers become oscillatory and are gradually decayed to a static tension. Thus, fatigue loads are applied to the droppers of high-speed rail catenary. It is said that one of the major maintenance works associated with Kyeongbu High-Speed Rail overhead contact line is to replace the broken droppers with new ones. It is expected that droppers are likely to be broken more frequently as train speed increases from 300km/h to 400km/h. In order to save maintenance costs with droppers, it is desirable to reduce dynamic forces on the droppers by giving no-sag to a contact wire. It is necessary to establish fatigue test load to droppers in order to ensure that they have infinite fatigue life during the factory test. To this end, we simulated the dynamic forces on the droppers by using SPOPS, the dynamic simulation program for overhead contact line and a pantograph coupled system. The accuracy of the simulation was validated by comparing those with measurement data taken from Kyeongbu High-speed line. Based on the simulation results, we proposed that fatigue test load is set to be 300N for the purpose of the validation of infinite fatigue life for the droppers of the High-speed overhead contact line for 400km/h operation.
조용현(Yong Hyeon Cho),이기원(Kiwon Lee),권삼영(Sam Young Kwon),조호령(Ho Rung Cho) 대한전기학회 2015 전기학회논문지 Vol.64 No.12
The pulley-type tensioning device subjected to a maximum tension of 34 kN has been developed for 400 km/h high-speed railway. The tensioning device is to maintain the tension variation within 3% of the normal value, irregardless of temperature changes. Field tests shows that the tensioning device had a variation of tension which was as small as 0.6% as temperatures changed from –5 ~ 7℃. Along with the tensions, we measured its X and Y movements due to the temperature changes. Based on a combination of its X and Y movements, we proposed a new performance index with which we can see if the tensioning device has troubles in operation without tension measurements.
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.