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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.
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),최강윤(Kangyoun Choe),조기조(Kijo Cho),권삼영(Sam-Young Kwon) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
The elasticity of the contact wire is one of important static parameters for the catenary system. This paper presents how to analyse the elasticity of the catenary system using both simple string model method and finite element method with their formula. Analysis results obtained by these two methods for KTX catenary system are compared. A measurement of the elasticity for the KTX catenary under construction which is located near Kumkang bridge is made for the comparison with the analysis results. Both a dynamic and a static methods are tried for the measurement. Because of wave propagation, the dynamic method with 5 ㎞/h running presented an asymmetric variational pattern of the elasticity while the static method presented a symmetric pattern of the elasticity in the span. Measured elasticity using the static method is found to be a little higher than the analysis results. But, the static method can presented us a variational pattern of the elasticity in the span similar to the analysed results. Therefore, the static method can be used for evaluating the elasticity of the catenary system.
G7 고속전철기술개발사업 집전시스템 사양의 최적화 연구
조용현(Yong Hyeon Cho),김영국(Young Guk Kim),현승호(Seung-Ho Hyun),이기원(Kiwon Lee),김휘준(Hwi Jun Kim) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
A study on Technical Specifications of the current collection system in G7 Korean High Speed Train Project is performed in this paper. First, an appropriate level of contact wire tension for 350 ㎞/h commercial operation is proposed based on the foreign high speed train operation experiences and a relevant technical criterion. Second, two optimized design specifications of the pantograph for G7 Korean High Speed Train are proposed based on current collection quality. In order to perform design optimization, a formulation on the follow-up characteristics of a pantograph with 3 levels of masse-spring-damper is derived in this paper. Dynamic design parameters of the pantograph are adjusted to maximize follow-up capability at the dropper and span passing frequencies.
조용현(Yong Hyeon Cho),박영(Young Park),정현진(Hyun Jin Jung) 대한전기학회 2015 전기학회논문지 Vol.64 No.8
Along with the increase of railway catenary system operation speed to 400 km/h, there have been growing demands for good quality current collection systems that satisfy quality standards as well as criteria for safe working. Retaining uniform elasticity tension of contact wires is essential in maintaining high quality contact between pantograph and OCL (Overhead Contact Line) of current collection systems in high speed railways. Therefore, the tension of contact wire must be kept within tight tolerance limits in both working conditions and adverse weather conditions of catenary system. In accordance with these conditions, this paper presents a real time monitoring system for the tensioning device of the newly installed catenary system on the special route of Honam high speed line for 400 km/h operation. For the verification of the true value of tension of contact wires, we have developed ring-type tensioning sensors which were installed on supporting points of mast which compose the catenary system. According to the field test performed on the Honam high speed line catenary system, variation of tension was measured accurately in real-time.
200 ㎞/h급 전차선로 구조강도 설계기준에 관한 기술적 검토
조용현(Yong Hyeon Cho),이기원(Kiwon Lee),권삼영(Sam-Young Kwon),최강윤 (Kangyoun Choe),창상훈(Sang-Hoon Chang) 한국철도학회 2001 한국철도학회 학술발표대회논문집 Vol.- No.-
??In this study, a comparison between the structural design criteria for a catenary system with the maximum design speed of 100km/h and that of 300km/h was performed in order to establish that of 200km/h. According to the result, catenary design criteria for 300km/h operation is more conservative than that for l00km/h operation. This result shows that higher wind pressure and safety factor are adopted to catenary design for 300km/h operation. So, for the purpose of the economic structural design for catenary system, it is necessary to review the adoption possibility of catenary system for 100km/h operation first, In order to review the adoption possibility for catenary system for l00km/h operation, design criteria for 300km/h operation should be chosen for safer catenary structure.