• Title, Summary, Keyword: Rail Stability

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Behavior of Sand Bag for Maintenance Railroad Bed Subjected to Cyclic Loading (반복하중을 받는 철도노반보수용 샌드백의 거동분석)

  • Shin Eun-Chul;Hwang Seon-Keun;Lee Dong-Hyun;Ryu In-Gi
    • Proceedings of the KSR Conference
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    • pp.1033-1040
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    • 2004
  • Utilizing of the geotextile container shows several advantages such as standardized construction, factory manufactured products, the control of quality, workability. and economical point of view. Recently this technique can be applied to rehabilitate the loss of rail roadbed due to the heavy rainfall. In this study, a large-scale laboratory test were conducted with simulation of static performance on the geotextile container reinforced rail roadbed. Based on the laboratory test results, the vertical pressure distribution with respect to the depth, and settlement of rail roadbed were measured and compared test results between geotextile container reinforced case and unrein forced case. Thus, the effectiveness of reinforcement was evaluated in terms of its performance and stability.

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A Study on Probabilistic Approach Method for Stability of the Ballasted Track (자갈궤도의 안정성 확보를 위한 확률론적 접근 방안에 대한 연구)

  • Lee, Woo-Chul;Choi, Jin-Yu;Lim, Nam-Hyoung;Lee, Chin-Ok
    • 한국방재학회:학술대회논문집
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    • pp.299-302
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    • 2008
  • The behavior of continuous welded rail tracks is directly affected by the following various parameters: rail size; track curvature; neutral temperature; misalignment; and ballast resistance. Most of these parameters are having the nature of random variables. Therefore, uncertainties exist in the buckling safety assessments. The evaluation of the buckling safety and the maintenance strategy based on the deterministic analysis are very inefficient since the value of deterministic parameters are selected in worst track condition. In this study, the probabilistic approach method were investigated considering the probabilistic distribution of major parameters such as the neutral temperature of rail and the ballast resistance.

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A Study on establishing Improvement Plan of Rail Bridges (철도교량의 개량계획 설정에 관한 연구)

  • Baek, Jae-Wook;Park, Tae-Hyo
    • Proceedings of the KSR Conference
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    • pp.10-16
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    • 2008
  • In order to improve stability of rail and ride comfort, railway bridges should be maintained a integrity. However, it is necessary to plan various reinforcements and improvements because of a long term used and external effects. In this paper, the improvement plan which is reflected by investigation for reinforcement and improvement is introduced. The constituents of the structures are defined in order to optimize the improvement plane, and the analysis for relationships between the constituents are performed by several evaluation. Finally, the improvement plan is applied to a structure using impact factors for the external effects in order to obtain the improvements reasonably.

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Evaluation of Running Stability of Tilting Trains in Conventional Curved Track (틸팅차량의 기존선 곡선부 주행안정성 평가)

  • 엄기영;엄주환;유영화;최정호
    • Journal of the Korean Society for Railway
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    • v.7 no.4
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    • pp.367-373
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    • 2004
  • The investigation of running stability of the train for curved track is necessary in view of preventing the train from derailment caused by unbalanced forces transferred from the wheel and guaranteeing moderate level of running safety in curve sections. This paper carried out an analysis of running stability of tilting trains in conventional line which the test operation of tilting trains under development are scheduled. For this purpose, the wheel load and lateral pressure to the rail are evaluated. The criteria for the calculated wheel load and derailment coefficient are compared to the design criteria for running stability. It is founded that the running stability of tilting trains for curved track is guaranteed to have sufficient safety and the train speed in curve is governed by the geometric layout of track rather than the criteria for running stability.

The Strategy of Wireless Power Transfer for Light Rail Transit By Core Technologies Analysis Based on Text Mining

  • Meng, Xiang-Yu;Han, Young-Jae;Eum, Soo-Min;Cho, Sung-Won
    • Journal of the Korea Society of Computer and Information
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    • v.23 no.11
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    • pp.193-201
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    • 2018
  • In this paper, we extracted relevant patent data and conducted statistical analysis to understand the technical development trend related to Wireless Power Transfer (WPT) for Light Rail Transit (LRT). Recently, with the development of WPT technologies, the Light Rail Transit (LRT) industry is concentrating on applying WPT to the power supply system of trains because of their advantages compared wired counterpart, such as low maintenance cost and high stability. This technology is divided into three areas: wireless feeding and collecting technology, high-frequency power converter technology and orbital and infrastructure technology. From each specific area, key words in patent document were extracted by TF-IDF method and analyzed by social network. In the keyword network, core word of each specific technology were extracted according to their degree centrality. Then, the multi-word phrases were also built to represent the concept of core technologies. Finally, based on the analysis results, the development strategies for each specifics technical area of WPT in LRT filed will be provided.

A 1.5 V High-Cain High-Frequency CMOS Complementary Operational Amplifier

  • Park, Kwangmin
    • Transactions on Electrical and Electronic Materials
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    • v.2 no.4
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    • pp.1-6
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    • 2001
  • In this paper, a 1.5 V high-gain high-frequency CMOS complementary operational amplifier is presented. The input stage of op-amp is designed for supporting the constant transconductance on the Input stage by consisting of the parallel-connected rail-to-rail complementary differential pairs. And consisting of the class-AB rail-to-rail output stage using the concept of elementary shunt stage and the grounded-gate cascode compensation technique for improving the low PSRR which was a disadvantage in the general CMOS complementary input stage, the load dependence of open loop gain and the stability of op- amp on the output load are improved, and the high-gain high-frequency operation can be achieved. The designed op-amp operates perfectly on the complementary mode with the 180° phase conversion for a 1.5 V supply voltage, and shows the DC open loop gain of 84 dB, the phase margin of 65°, and the unity gain frequency of 20 MHz. In addition, the amplifier shows the 0.1 % settling time of .179 ㎲ for the positive step and 0.154 ㎲ for the negative step on the 100 mV small-signal step, respectively, and shows the total power dissipation of 8.93 mW.

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A Study on the Comparison of Performance of PC-Slab Composite Plate Girder from the Actual Sized Experiment (실물실험을 통한 PC-Slab합성 판형교의 성능비교연구)

  • Min, Kyung-Ju;Lee, Sung-Uk;Kim, Yung-Guk;Woo, Yong-Keun
    • Proceedings of the KSR Conference
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    • pp.1300-1309
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    • 2010
  • In the railway bridges, steel plate girder types are preferred due the high stability. Nevertheless, it has been pointed out that this type of bridge has problems such as, structural damages in the rail and girder seat, noise problem due to impact at the rail joint and excessive vibration. This vibration and/or deflection are mainly because insufficient stiffness of steel plate type of bridge. To resolve these problems, PC-Slab composite plate girder type which has simple process and economic cost, is proposed in this study. The static and dynamic experiment is performed by using the production of actual sized PC-Slab and abandoned steel plate girder. The object of this experiment is to verify the fact that girder stiffness increase and structural safety. The result of the experiment is used to analyze the effect of performance improvement of PC composite plate girder type. Using this method, economic rail maintainers, girder stiffness increase, and also speed/ride improvement even for existing rail could be expected by dynamic performance improvement. Additionally noise due to impact, deflection and vibration caused from long rails can be reduced.

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Dynamic Analysis of Wheel-Rail High Speed Train Propelled by Superconducting Linear Synchronous Motor (초전도 선형동기전동기 추진 휠-레일 고속열차의 동특성 분석)

  • Lee, Jin-Ho;Lee, Chang-Young;Jo, Jeong-Min;Han, Young-Jae
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.1
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    • pp.119-125
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    • 2016
  • This study examined the running dynamic characteristics of a hybrid type wheel-rail high speed train, in which the propulsion method of maglev is applied. A wheel-rail high speed train propelled by a superconducting linear synchronous motor (SC-LSM) is expected to be superior to a maglev train regarding economical and interoperable aspects, still having powerful thrust force as maglev. In this paper, regarding the two methods of applying the SC-LSM to an existing wheel-rail train, to investigate the influences of SC-LSM propulsion on the dynamic characteristics of wheel-rail high speed train, the dynamic model of train including interaction between the rotor and stator of SC-LSM is established. Through the simulation using the model, the influence of the interaction between the rotor and stator of SC-LSM on stability, ride comfort and the effect of guideway irregularity are investigated.

A Study on the Influence of Track Stability for Ballast Resistance Force (도상저항력이 궤도 안전성에 미치는 영향)

  • 박준명;이방우;박선규;이종득
    • Journal of the Korean Society for Railway
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    • v.6 no.3
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    • pp.169-173
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    • 2003
  • Transportation by railroad is superior to other transport in a mass transport, stability, rapid transit, delightfulness and low-pollution etc. But, it need to ensure a track stability that supports the train-load for high-speed in transportation by railroad. Ballast resistance force resists against the buckling of track taking a rail-tie's place. So, it plays an important role in a careful train-service. So, in this papers, we forced on measuring and theorizing about the Ballast Resistance Force that play a key role in track stability and high-speed. And we studied the mechanical property. Finally, we suggested the method of securing Ballast Resistance Force and the report for a careful train-service in high-speed.