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레일 매립형 궤도시스템(ERS, Embedded Rail System)의 최적단면에 관한 연구
황만호(Hwang, Man-Ho),윤경민(Yun, Kyung-Min),김순철(Kim, Soon-Cheol),임남형(Lim, Nam-Hyoung) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.4
레일 매립형 궤도시스템은 연속레일지지방식으로 하중분산 효과가 크며,궤도부재에 발생하는 응력이 매우 작다. 다양한 장점을 갖고 있는 레일 매립형 궤도는 국내에 적용사례가 드물며,고속 운행선 적용을 위한 연구는 매우 미흡하다. 본 논문에서는 고속운행선에서의 레일 매립형 궤도시스템 적용을 위한 기초연구로써,실내시험을 통한 수직강성을 도출하였 으며,도출된 강성과 이론해석을 통해 최적단면을 도출하였다. An ERS(Embedded Rail System) has large effect on the load distribution because of its continuous rail support. Therefore, stress level of the track components is lower than that of other system. Though the ERS has various advantages, the application example in a domestic railway is rarely applied and the studies for the application of high-speed service lines are insufficient. In this paper, the vertical stiffness is derived from laboratory test and the optimized cross-section is also derived from the analytical analysis as a basic study for application of ERS on the high-speed service lines.
황만호(Man Ho Hwang),배영민(Youngmin Bae),강기동(Kee-Dong Kang),권순정(Soon-Jung Kwon) 한국철도학회 2017 한국철도학회 학술발표대회논문집 Vol.2017 No.05
판형교는 자갈도상이 없이 거더에 침목이 직결된 무도상 교량구조로, 현재 일반선에 450개소 이상 부설되어 있다. 최근 일반선 구간의 열차 고속화와 중량화 사업이 활발히 진행되고 있으므로, 판형교 개량 또는 기존 형식에서 레일 장대화 요구는 지속해서 증가하고 있다. 레일 비장대화는 승객의 승차감, 차량의 주행 안정성 저하 및 열차속도의 제한 요인으로 작용하며 이음매구간을 열차가 통과할 때 발생하는 큰 충격하중은 궤도 파괴와 차륜 손상으로 유지보수 비용 증가를 시킨다. 특히 판형교 상의 레일 비장대화는 다른 유도상교량 형식에 비해 큰 소음 및 진동이 발생함에 따라 열차를 이용하는 승객 및 주변 주민의 큰 불편을 초래한다. 따라서 본 논문에서는 기존 판형교 상에서 레일을 장대화할 수 있는 여러 공법을 소개하고 각각의 공법에 대해 비교 분석을 수행하였다. Plate girder bridges are ballastless bridges which do not have the ballast and the sleepers are directly fixed to girders of the bridge. Currently there are over 450 plate girder bridges in the conventional line. Due to the recent trend of improving the conventional line in terms of its speed and weight, there is a growing need of improving as well as performing CWR at the plate girder bridge. If the CWR is not applied to the rail, it will reduce the comfort as well as driving stability and also limit the speed of the train. It will also cause the loading force. This is coming from when the train passes through the joint part. This force will cause the destruction of thee track as well the wheel. Thus, it will increase the need and the cost of maintenance. Not applying CWR at the plate girder bridge is not favorable. This is because when it is compared to the ballast bridge, it has much more noise and vibration. Therefore, passengers as well as individuals live around the track will suffer from them. The following study will introduce construction methods to perform CWR at the existing plate girder bridge and it will conduct comparative analysis on these methods.
레일의 단ㆍ장파장 결함에 따른 궤도의 동적응답 변화특성 분석
최진유(Choi Jin Yu),황만호(Hwang Man Ho),양신추(Yang Shin Chu),황성호(Hwang Sung Ho) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
A numerical analysis was performed to verify how much additional force is induced by short or long pitch rail corrugations in track. The rail corrugations assumed as sine wave having various pitches and depths. The variation of wheel force, displacement and acceleration of rail and sleeper was investigated. In the results, it was shown that each item of the investigation was increased as the pitches and depths become large. It is expected that the results of the parametric study can be used as a preliminary data for the determination of economical maintenance criteria for rail corrugation in the future.
최진유(Choi Jin-Yu),김은(Kim Eun),황만호(Hwang Man-Ho),조수익(Cho Su-Ik) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
Ballasted track is under the circumstance of repetition of deterioration and recovery. Track deterioration is presented as track irregularity or settlement, and dynamic force subjected to track is one of major cause of the deterioration. The dynamic force is determined from the dynamic interaction between track and vehicle. Rail-pad stiffness is one of the factor affects track dynamic property. In this study, the relationship between rail-pad stiffness and track settlement was investigated. Dynamic forces according to various rail-pad stiffness was obtained from the dynamic vehicle-track interaction analysis using DARTS-NL. Track settlement was calculated by substitution the dynamic forces into various formulas for track settlement. From the result of analysis, it was known that the track settlement is increased about 6% when the rail-pad stiffness rise about twice. And this result leads that there is only a little relationship between rail-pad stiffness and track settlement.
윤경민(Kyung-Min Yun),한상윤(Sang-Yun Han),황만호(Man-Ho Hwang),김해곤(Hae-Gon Kim),임남형(Nam-Hyoung Lim) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
In case of the continuous welded rail(CWR) track is supported by the railway bridge the additional axial force is occurred in the CWR due to the track-bridge interaction. In the various design codes such as Korean code European code UIC code etc three important loads(temperature variation in the bridge-deck braking/acceleration and the bending of the bridge-deck resulted from the passing train) are treated as the independent loading case. In other words the additional axial force can be obtained by summing up the three different values calculated by the three independent analysis. However this analysing method may have an error because the behavior of the longitudinal resistance between the rail and the bridge-deck is under the highly nonlinear. Therefore in order to exactly analyse the track-bridge interaction nonlinear loading history and the change of the longitudinal resistance owing to the loading history must be considered in the analysis process. In this study the loading history effect on the track-bridge interaction is investigated considering the resonable combination of three loads and the longitudinal resistance change.
아스팔트콘크리트 궤도 시험부설구간에서의 열차 주행 시 콘크리트 패널에 작용하는 응력 특성 분석
백인혁(In Hyuk Baek),박진철(Jin Chul Park),황만호(Man Ho Hwang),배영민(Young Min Bae),한두섭(Du Sub Han),이성혁(Seong Hyeok Lee) 한국철도학회 2017 한국철도학회 학술발표대회논문집 Vol.2017 No.05
무도상 궤도의 한 종류인 아스팔트 콘크리트 궤도는 지속적인 유지보수를 필요로 하는 자갈 궤도와 소음·진동 및 궤도 변형 시 보수가 어려운 콘크리트 궤도의 특징을 상호보완 할 수 있는 신개념 궤도 시스템으로서 국내에서도 수년 전부터 연구개발이 추진되고 있다. 이러한 아스팔트 콘크리트 궤도 성능 검증의 일환으로 현재 현장설치시험을 통한 장기 거동 계측을 진행 중에 있다. 본 연구에서는 아스팔트 콘크리트 궤도의 구성품으로써 개발된 콘크리트 패널의 외부와 내부에 매립된 스트레인 게이지를 통해 열차 주행 시 측정한 응력을 분석하였으며, 또한 열차의 속도와 윤중 및 횡압 등을 분석하였다. A Type of Ballast-less Track, which is The Asphalt-concrete Track(ACT) is complementary that sustained maintenance necessary Ballasted Track, Noise & vibration and hard maintenance as track strain Concrete Track with advanced concept Track System. It has been relevant research and development in Korea is ongoing from a few years ago. Asphalt-concrete Track(ACT) is using field test for performance monitoring measurement as part of functional qualification. In this study, a concrete panel as component of Asphalt-concrete Track installed strain gauge of outside and inside that is measurement on train passage. It considered a wheel and lateral force in comparison with train speed.