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양신추(Yang Shin Chu),이지하(Lee Jee Ha),김은(Kim Eun) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
In high-speed line, at some part of the track which rubber ballast-mat installed, track irregularity grew rapidly and affected riding comfort and train running stability. It is urgently requested to establish counter-measures which can be applied to track under operation. To do this, it is very important to analysis the origin of that phenomenon before. Track support stiffness is an essential factor for evaluating track condition. Sudden changes of support stiffness along track occur instability of train and bad riding comfort. Preventing sudden changes of track support stiffness is a key technique in high-speed track maintenance. Besides the sudden changes, the magnitude itself also significantly affects track and train. Low stiffness of ballast-mat makes ballast acceleration area wider. And it may accelerate track irregularity growth. So, the stiffness should be limited. To calculate track stiffness, measuring load and displacement on track is needed. In this study, the behavior of the track which rubber ballast-mat installed was measured and analyzed to understand the origin of rapid growth of it.
양신추(Yang Shin Chu),김인재(Kim In Jae),김은(Kim Eun) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Most of design parameters of Railway Structures are determined by the serviceability requirements, rather than the structural safety requirements. The serviceability requirements come from Ensuring of Running Safety and Ride Comfort of Train, Reduction of Track Maintenance Work Track-Bridge Interaction should be considered in the design of railway structures. In this study, a numerical method which precisely evaluate an axial force in rail and a rail expansion and contraction when turnout exist in succession on a CWR on a ballasted or on a ballastless track of bridge is developed. From the parameter studies using the developed method, additional stress of stock rail almost 25% is generated due to stock and lead rail interaction, even embankment not bridge. In case of ballasted track, additional stress of stock rail on bridge is very greater than on embankment, and therefore require detailed review in bridge design with turnout. Stresses of turnout rails on bridge are very sensitive according to the installed positions. In case of ballastless track, Stresses of turnout rails are similar as those of normal track.
양신추(Yang Sin-Chu),신정렬(Shin Jeong-Ryol),정우진(Chung Woo-Jin) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
With speed-up of existing railway, a greater attention is paid to the riding safety and the comfort of the passengers. They are combined to some technical factors related to track such as alignment, derailment coefficient, and track bearing capacity. A quantitative analysis method for those technical factors is presented in this study. Calculating the allowable transit speed, the technical reviews of speed-up of Janghang-Line(Chunan~Janghang) are conducted. And the alternatives for improving train speed in existing railway are proposed.
양신추(Yang Sin-Chu),김은(Kim Eun),이지하(Lee Jee-Ha),신정렬(Shin Jung-Ryul) 한국철도학회 2001 한국철도학회 학술발표대회논문집 Vol.- No.-
In this study, a empirical equation which can be feasibly used to evaluate minimal track buckling strength without exact numerical analysis is presented. Parameter studies are carried out to investigate the effects of the individual factor on buckling strength. In order to simulate track buckling in the field as precisely as possible, a rigorous buckling model which accounts for all the important parameters is adopted. A empirical equation for prediction of minimal track buckling strength is derived by taking nonlinear regression of data which are obtained from numerical analyses. Its characteristics and applicability are investigated by comparing the results by the presented equation with the one by the equation which was presented in japan, and is frequently using in korea when designing track structure.
역해석 기법을 활용한 철도 소음 진동 예측에 관한 연구
신한철(Shin Han Chul),조선규(Cho Sun Kyu),양신추(Yang Shin Chu),최준성(Choi Jun Seong) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
Recently the railway becomes principal transportation on account of the important role in mass transit and commute in urban area. However, rail noise and vibration raise a major problem for the residents living nearby railway track. At that point of view, the effective counterplan for the soundproofing and protection of vibration has to be considered in the process of railway design. Therefore, the reliable computation of load caused by running train on rail is very important to estimate vibration of structure adjacent to railway. In this study, Input identification is used for the calculation of load and vibration, induced by high speed train on rail. The influence of railroad noise and vibration on structure is evaluated using the 3-D Finite element method and the reliability of the evaluation is discussed comparing with the results of the field measurements.
지반-구조물 상호작용을 고려한 교량상 장대레일의 비선형 지진응답해석
신한철(Shin Han Cheol),조선규(Cho Sun Kyu),양신추(Yang Shin Chu),최준성(Choi Jun Seong) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Recently continuous welded rail is generally used to ensure running performances and to overcome the problems such as structural vulnerability and fastener damage at the rail expansion joint. Though the use of continuous welded rail on bridge has the advantage of decreasing the vibration and damage of rail, it still the risk of buckling and breaking of rail due to change of temperature, starting and/or breaking force, axial stress concentration and so on. So, UIC code and many methods has been developed by researchers considering rail-bridge interaction. Although there are many research concerning stability of continuous welded rail about temperature change on bridge and starting and/or breaking force, the study of continuous welded rail for earthquake load is still unsufficient. In this study, the nonlinear seismic response analysis of continuous welded rail on bridge considering soil-structure interaction, geotechnical characteristic of foundation and earthquake isolation equipment has been performed to examine the stability of continuous welded rail.
강윤석,강영종,양신추,조선규,한상윤,Kang, Yun Suk,Kang, Young Jong,Yang, Shin Chu,Cho, Sun Kyu,Han, Sang Yun 한국강구조학회 2007 韓國鋼構造學會 論文集 Vol.19 No.4
장대레일은 동절기에 기온하강으로 인한 인장력을 발생하는데 중위온도 이하로 떨어져 파단이 발생되면 인장파단과 레일 간에 틈이 발생되며 이를 개구부라 한다. 이 개구부를 차륜이 통과하면 충격하중이 발생하며, 큰 손실이 발생할 수 있는 열차탈선이 발생할 수 있다. 본 연구에서는 동적해석을 위해 개구부를 가진 궤도와 차량의 상호작용을 고려한 동적해석모델을 제안하였다. 궤도와 차량의 선형시스템은 비선형 헤르찌안 접촉 스프링에 의해 연성되었으며 전체 궤도-차량 시스템 운동방정식을 정식화하였다. 그리고 개구부에서의 상호작용 현상을 고려하여 궤도 불균일부의 함수를 정의하고 개구부에서의 전후방 레일 사이의 개구량을 고려하였다. 비선형 방정식을 풀기위해 동적해석은 수정된 Newton-Raphson 방법에 근거한 Newmark - $\beta$ 방법에 의해 수행되었다. 그리고 차량속도, 개구량, 레일지지강성에 따른 매개변수를 조건으로 수치해석을 수행하였다. During winter, the CWR (continuous welded rail) may be broken when a temperature drop below the neutral level changes the axial force, causing tensile fracture and creating a rail gap. The passage of a train on a rail with an open gap may lead to very costly derailments. In this paper, the use of a track-and-train-coupled model whose rail has an open gap is proposed for dynamic interaction analysis. Linear track and train systems were coupled in this study by a nonlinear Herzian contact spring, and the complete system matrices of the total track-train system were constructed. Moreover, the interaction phenomenon considering the presence of an open gap in the rail was toughly defined by assigning the irregularity functions between the two sides of the gap. Time history analysis, which has an iteration scheme such as the Newmark-$\beta$ method (based on the Modified Newton-Raphson methods), was conducted to solve the nonlinear equation. .Finally, numerical studies were conducted to assess the effect of the various parameters of the system when applied to various speeds, open-gap sizes, and support stiffnesses of the rail.
국내ㆍ외 현황 분석을 통한 도시철도 곡선부 선로선형 설계기준 연구
신정렬(Jeong-Ryol Shin),홍재성(Jae-Sung Hong),이우동(Woo-Dong Lee),김길동(Gil-Dong Kim),한석윤(Seok-Yun Han),양신추(Sin-Chu Yang) 한국철도학회 2003 철도저널 Vol.6 No.3
With designing alignment of railway for urban rail transit, a greater attention is paid to the riding safety and the comfort of the passengers. Especially, cant, transition curve, minimum curve radius are considered as very important alignment factors for the curve. For the above alignment factors, in this study, comparative studies on the design criteria of foreign rail transit are conducted. And reasonable design criteria of the alignment for urban rail transit are proposed.