• Title/Summary/Keyword: 1열차

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Study on a 2-Dimensional Dynamic Modeling Technique to Analyze the Overriding Phenomena of Rollingstock (열차의 타고오름 해석을 위한 2차원 충돌동역학 모델링 기법 연구)

  • Kim, Geo-Young;Koo, Jeong-Seo;Kwon, Tae-Soo
    • Journal of the Korean Society for Railway
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    • v.14 no.1
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    • pp.11-18
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    • 2011
  • This paper proposed a new 2-D multi-body dynamic modeling technique to analyze overriding behaviors taking place during train collision. This dynamic model is composed of nonlinear springs, dampers and masses by considering the deformable characteristics of carbodies as well as energy absorbing structures and components. By solving this dynamic model for rollingstock, energy absorbing capacities of collision elements, accelerations of passenger sections, impact forces applied to interconnecting devices, and overriding displacements can be well estimated. For a case study, we chose KHST (Korean High Speed Train), obtained crush characteristic data of each carbody section from 3-D finite element analysis, and established a 2-D multi-body dynamic model. This 2-D dynamic model was simulated under the train-to-train collision scenarios, and evaluated with 3-D virtual testing model. It was founded from the simulation results that this 2-D dynamic model could well predict overriding behaviors, and the modeling technique of carbody deformation was very important in overriding estimation.

Design of Beam-forming Reader Antenna for Train Position Detection using RFID (RFID 시스템 이용한 열차 위치검지용 빔폭 가변형 RFID 리더안테나)

  • Ahn, Chi-Hyung;Cho, Bong-Kwan;Ryu, Sang-Hwan;Oh, Soon-Soo
    • Journal of the Korean Society for Railway
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    • v.18 no.2
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    • pp.105-110
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    • 2015
  • This paper presents a $4{\times}1$ beam-forming reader antenna system for a new type of RFID based train position detection technology. The required beamwidth of the reader antenna is analytically expressed for different train speeds. The proposed antenna system consists of four rectangular patch elements and two switching couplers which are designed, without any impedance matching networks, for two different antenna modes. The switching coupler is a rectangular quadrature coupler with Pin diodes connecting its center line and the ground plane. The beamwidth of the antenna when the diodes are off and on is $18^{\circ}$ and $39^{\circ}$, respectively. The proposed antenna system will be used for a real train test in the near future.

A study on the Dynamic Behavior Enhancement of the Korean High-speed Train (고속열차의 주행동특성 개선에 관한 연구)

  • Jeon, Chang-Sung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.10
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    • pp.81-87
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    • 2017
  • This paper describes the dynamic behavior and enhancement of Korean high-speed trains. The tail vibration reduction method of the yaw damper installation method change, which was derived from previous research, was applied to the running test of high-speed train. In addition, the vibration reduction method for the entire vehicle was derived by a numerical method and its effect was confirmed by a running test. The improved design was applied to the double-deck high-speed train coaches and the commissioning proceeded without problems in dynamic behavior. Sensitivity analysis of the suspension parameters affecting the critical speed of Korean next-generation high-speed trains was performed and four design variables that greatly affected the critical speed were derived. These were in the order of the primary elastic joint x-directional stiffness, the secondary yaw damper series stiffness, the secondary lateral damper damping coefficient, and the carbody damper damping coefficient. By optimizing the design variables, the suspension parameter that improves the critical speed by 23.3% can be used in the commercial designs of Korean next-generation high-speed trains.

Mixed Operation with Express Train for Urban Railways in Seoul Metropolitan Area (대피선 설치를 통한 수도권 광역철도 급행화 방안)

  • Son, Gi-Min
    • Journal of Korean Society of Transportation
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    • v.25 no.5
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    • pp.195-207
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    • 2007
  • The urban railways connecting between the inner city and suburb of Seoul metropolitan area, has lost the competitiveness against cars because too many stops deteriorated operating speed and passenger's level of service. This paper suggests that an express train should be introduced into the urban railway system in order to sort out such a complication. There are two considerations in the present study. Firstly, train schedule problem should be taken into account. In this regard, a new model for urban railway system was developed by revising the existing models dealing with single line freight railway. Approximate branch and bound algorithm based on conflict group rather than a single conflict was adopted. Consequently, it was found that the time saving in calculating the optimal schedule is the most meaningful contribution of the algorithm. The second consideration is associated with the application of the model. A case study was carried out using the actual operation data from Ansan line. In conclusion, the operation speed of the line can increase considerably with minimal number of new sidings.

Arrival Delay Estimation in Bottleneck Section of Gyeongbu Line (철도선로용량 부족에 따른 지체발생 연구 - 경부선 서울~금천구청 구간을 대상으로)

  • Lee, Jang-Ho
    • Journal of the Korean Society for Railway
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    • v.18 no.4
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    • pp.374-390
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    • 2015
  • This research shows the relationship between the number of trains and the probability of trains with arrival delay and suggests way to estimate the benefits of improved punctuality in a bottleneck section of the Gyeongbu Line. The arrival delays of high-speed and conventional trains were estimated using the train operation data of KORAIL. Linear regression models for the probability of trains with arrival delay by train type are presented in this paper. The probabilities of trains with arrival delay were more affected by the number of conventional trains than by the number of high-speed rail trains. For the empirical analysis, a project for increasing the capacity in the Seoul~Geumcheongu office section was tested. The benefits of the improved punctuality were estimated to be 4.2~4.5 billion Korean won every year. This research has some limitations but it can help evaluate more precisely the feasibility of the project of increasing the capacity in bottleneck sections.

Dynamic Interaction Analysis of Low, Medium and Super-high Speed Maglev and Guideways (열차-교량의 동적 상호작용을 고려한 중·저속 및 초고속 자기부상열차와 가이드웨이의 동특성 해석)

  • Min, Dong-Ju;Jung, Myung-Rag;Lee, Jun-Seok;Kim, Lee-Hyeon;Kim, Moon-Young
    • Journal of the Earthquake Engineering Society of Korea
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    • v.15 no.3
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    • pp.1-9
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    • 2011
  • The purpose of this study is to examine the dynamic characteristics of low, medium and high speed Maglev trains and guideways through dynamic interaction analysis. The coupled dynamic equations of motion for a vehicle of 10-dof and the associated guideway girders are developed by superposing vibration modes of the girder itself. The controller used in the UTM-01 Maglev vehicle is adopted to control the air gap between the bogie and guideway in this study. The effect of roughness, the guideway deflection-ratio and vehicle speed on the dynamic response of the maglev vehicle and guideway are then investigated using the 4th Runge-Kutta method. From the numerical simulation, it is found that the air gap increases with an increase of vehicle speed and the roughness condition. In particular, the dynamic magnification factor of the guideway girder is small at low and medium speeds, but the factor is noticeable at super-high speeds.

Moving urban Maglev-vehicle analysis considering nonlinear magnetic levitational force effect (전자기력의 비선형 효과를 고려한 도시형 자기부상열차의 주행해석)

  • Lee, Jun-Seok;Yoo, Sung-Hyun;Lim, Dong-Jun;Kim, Moon-Young
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2009.04a
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    • pp.544-547
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    • 2009
  • 본 연구는 자기부상력의 선형 및 비선형효과가 이동중인 자기부상열차의 부상공극에 미치는 영향을 파악하는데 목적이 있다. 이를 위하여 자기공극의 피드백을 포함한 1자유도 차량에 대한 운동방정식을 구성하고, 최적능동제어기법을 적용하여 수치해석을 수행하였다. 해석결과 차량의 속도가 증가함에 따라 자기부상력의 선형 및 비선형효과가 자기부상차량의 부상공극에 미치는 영향에 뚜렷한 차이가 발생함을 알 수 있다. 결국 자기부상열차의 정확한 해석을 위해서는 자기부상력의 비선형효과를 고려한 해석이 필요할 것으로 판단된다.

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A comparative study of field measurements of the pressure wave with analytical aerodynamic model for the high speed train in tunnels (고속철도 터널내 압력파 측정과 공기압 해석모델에 대한 기초연구)

  • Kim, Hyo-Gyu;Choi, Pan-Gyu;Hong, Yoo-Jung;Yoo, Ji-Oh
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.17 no.3
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    • pp.319-332
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    • 2015
  • The pressure wave formed by the piston effects of the train proceeds within the tunnel when a train enters the tunnel with a high speed. Depending on the condition of tunnel exit, the compression waves reflect at a open end, change to the expansion waves, transfer to tunnel entrance back. Due to interference in the pressure waves and running train, passengers experience severe pressure fluctuations. And these pressure waves result in energy loss, noise, vibration, as well as in the passengers' ears. In this study, we performed comparison between numerical analysis and field experiments about the characteristics of the pressure waves transport in tunnel that appears when the train enter a tunnel and the variation of pressure penetrating into the train staterooms according to blockage ratio of train. In addition, a comparative study was carried out with the ThermoTun program to examine the applicability of the compressible 1-D model(based on the Method of Characteristics). Furthermore examination for the adequacy of the governing equations analysis based on compressible 1-D numerical model by Baron was examined.

Numerical and experimental analysis of aerodynamics and aeroacoustics of high-speed train using compressible Large Eddy Simulation (압축성 대와류모사를 이용한 고속열차의 공력 및 공력소음의 수치적/실험적 분석)

  • Kwongi Lee;Cheolung Cheong;Jaehwan Kim;Minseung Jung
    • The Journal of the Acoustical Society of Korea
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    • v.43 no.1
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    • pp.95-102
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    • 2024
  • Due to technological advances, the cruising speed of high-speed trains is increasing, and aerodynamic noise generated from the flow outside the train has been an important consideration in the design stage. To accurately predict the flow-induced noise, high-resolution generation of sound sources in the near field and low-dissipation of sound propagation in the far field are required. This should be accompanied by a numerical grid and time resolution that can properly consider both temporal and spatial scales for each component of the real high-speed train. To overcome these challenges, this research simultaneously calculates the external flow and acoustic fields of five high-speed train cars of real-scale and at operational running speeds using a threedimensional unsteady Large Eddy Simulation technique. To verify the numerical analysis, the measurements of the wall pressure fluctuation and numerical results are compared. The Ffowcs Williams and Hawking equation is used to predict the acoustic power radiated from the high-speed train. This research is expected to contribute to noise reduction based on the analysis of the aerodynamic noise generation mechanism of high-speed trains.

A Study on the Structural Integrity of the First Stage Turbine Blade Caused by Thermal Barrier Coatings and the Cooling Design of the Nozzle (터빈 노즐 및 열차폐 코팅에 따른 고압 1 단 터빈 블레이드의 구조 건전성 영향에 대한 연구)

  • Huh, Jae Sung;Kang, Young Seok;Rhee, Dong Ho
    • Transactions of the KSME C: Technology and Education
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    • v.4 no.2
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    • pp.93-99
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    • 2016
  • High pressure nozzles and turbines of a gas turbine engine should be required to be operated under extreme operating conditions in order to maximize the performance. Engine manufactures have utilized nickel-base superalloys, enhanced cooling design, and thermal barrier coating techniques to overcome them and furthermore, material modeling, finite element analysis, optimization techniques, and etc. have been utilized widely for elaborate predictions. We aim to evaluate the effects on the low cycle fatigue life of the high pressure turbine blade caused by thermal barrier coatings and the cooling design of the endwall of the first stage turbine nozzle. To achieve it, the structural analysis, which utilized the results of conjugate heat transfer analysis as loading boundary conditions, was performed and then the results were the input for the assessment of low cycle fatigue life at several critical zones.