• Title/Summary/Keyword: 개량분기기

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Roadbed Bearing Capacity Associated with Estimated Impact Factor in Conventional and Improved Turnout System (기존 및 개량 분기기 충격계수 산정에 따른 노반 지지력)

  • Jeon, Sang-Soo;Eum, Ki-Young;Kim, Jae-Min
    • Journal of the Korean Society for Railway
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    • v.10 no.5
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    • pp.582-588
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    • 2007
  • Since the turnout system in railroad restricts the train speed, the KNR (Korean National Railroad) provides the specification for the speed (130km/h) of the train when the train passes the turnout system. Therefore, the turnout system in pre-existing railroad is necessary to be improved to speed-up for the train. In this study, the dynamic wheel-load field tests have been performed to evaluate the track performance and the roadbed bearing capacity has been examined using numerical analysis at the turnout crossing in the conventional and improved turnout system. The impact factor is estimated using the data sets achieved from the dynamic wheel-load field tests in the conventional and improved turnout system. The stress acting on the roadbed for the improved turnout system is substantially decreased compare to that for the conventional turnout system.

Simulation of Noise and Vibration around the Improved Turnout System (개량분기기 인근의 소음진동 시뮬레이션)

  • Eum, Ki-Young;Um, Ju-Hwan;Lee, Chin-Hyung
    • Journal of the Korea Society for Simulation
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    • v.15 no.4
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    • pp.119-128
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    • 2006
  • A turnout system which permits trains to pass from one track to another is a combination of the switch, the crossing, lead rails which are necessary to connect the switch and the crossing, two guard rails and a switch machine for operating the switch. A turnout is the sole moving part among the railway components and has complex configuration, so the safety has always been raised an issue. In Korea, it is planned to adopt the high speed tilting train, which operates at the maximum speed of 200km/h, at conventional lines by the year of 2010. However, for the application of the tilting train to conventional lines, it is prerequisite to establish a stable turnout system allowing the tilting train to pass through it without reducing speed. Therefore, the improved turnout system for the speed-up of conventional lines has been developed and the prototype of the turnout system has been constructed. In this study, simulation of noise and vibration around the improved turnout system was performed in order to predict the generation level of noise and vibration due to passing of the tilting train through the turnout system.

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Roadbed Behavior in Managanese Crossing of Turnout System (분기기 망간 크로싱부 노반거동)

  • Jeon, Sang-Soo;Eum, Ki-Young;Kim, Jae-Min
    • Journal of the Korean Geotechnical Society
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    • v.24 no.2
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    • pp.45-57
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    • 2008
  • The improved turnout system is developed to speed-up the pre-existing railroad. The research has been actively carried out far the improved turnout system and the impact factor is estimated using the data sets achieved from the dynamic wheel-load field tests in both the conventional and the improved turnout system. In this study, the track performance and roadbed behavior are examined for the conventional and improved turnout system using the estimated impact factor. Dynamic wheel load and rail pressure are evaluated to assess the track performance. Roadbed stress and settlements are estimated using numerical analysis. Additionally, the stability of roadbed is estimated in soft roadbed condition influenced by the weather effects and cyclic train loading. The results show that dynamic wheel load, rail pressure, roadbed stress, and roadbed settlements in the improved turnout system substantially decrease compared with those in the conventional turnout system.

Performance Measurement of Split PC Sleepers for Safety in Maintenance Work (분절형 PC침목의 안전성 확보를 위한 성능평가 시험)

  • Eum, Ki-Young;Um, Ju-Hwan;Sin, Seung-Kwon;Lee, Chang-Hun
    • Journal of the Korean Society of Hazard Mitigation
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    • v.6 no.4 s.23
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    • pp.1-6
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    • 2006
  • In terms of the speed-up of the conventional line, the research for a improved turnout was carried out continually around world. A turnout is known that it is the most unstable equipment structurally in the rail system. So, the turnout is needed more stable structure. An accurate assembly of turnout affects traveling qualify of turnout area and running safety. Therefore, a turnout which is pre-assembled at a factory by using the split PC sleeper is transported to construction site recently in advanced countries. In this paper, the performance measurements which estimate the safety of the split PC sleepers which are adopted for the first time to improve performance of turnout are implemented indoors. The split PC sleeper is one of components of the improved turnout. The test is considered of the worst ballast condition under the maintenance work as like STT(Swithc Tie Tamper) or MTT(Multiple Tie Tamper). These experiments results indicate that structural safety for the expansion joint of the split PC sleepers.

Dynamic Behavior Evaluation for Split PC sleeper using the Field Test (현장측정을 통한 기존 분기기용 목침목과 개량 분기기 부절침목의 동적거동 비교평가)

  • Um, Hwan-Ju;Lee, Chang-Hun;Eum, Ki-Young
    • Journal of the Korean Society for Railway
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    • v.9 no.6 s.37
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    • pp.746-752
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    • 2006
  • The major objective of this study is to investigate the dynamic behavior evaluation of split PC sleepers for railway turnout by the field test. In railway engineering, a turnout is necessary to allow a vehicle to move from one track to another. So, turnout is required very complex railway technologies such as lolling stock, track. In reference to conventional line speed-up and improvement railway, accurate assembly of turnout affects travel ins qualify of turnout area and running safety. Because of heavy weight and a large volume of the long sleeper used to turnout and car limit, transport and the prerequisite for trouble-free transport of the factory pre-assembled major turnout components is achieved through division of long sleepers. The one of the advantages for using a split sleeper is to reduce the dynamic vibration according to the information of developed nations. Therefore, we investigate the characteristic of dynamic behaviors of split sleepers which are adopted for the first time to improve performance of turnout From the field test results of the split sleeper, it is evaluated that the modification of weight, material and stiffness compared with wood sleeper is very effective for the ballast safety. However, the decrease in vibration of split sleeper was not found out.

Design and evaluation of renovated NSI T/O PC sleeper (개량형 NSI 분기기용 PC침목 설계와 성능평가)

  • Park, Choon-Bok;Kwon, Ho-Jin;Lee, Young-Sou;Yoon, Byung-Hyun;Shin, Won-Sun
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.1129-1137
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    • 2007
  • 50kg NSI PCT(Prestress Concrete Timber, sleeper) is developed for the purpose of low maintenance cost, Extend life cycle, Track stability, Friendly Environment, Good running quality. In this study, as a part of research which is to make renovated NSI turnout, the main objective of this study is the optimization of PC sleeper's section, the number of PS tension wire. For this purpose, the finite element analysis was conducted to evaluate the serviceability and the safety of NSI PC sleeper developed.

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Safety Security Method and Onboard Design for Inter-operation between CBTC, ATC Train Control System (CBTC, ATC 열차제어 시스템 간 상호운행을 위한 차상장치 설계 및 안전 확보 방안)

  • Lee, Jae-Ho;Oh, Sea-Hwa;Park, Jong-Moon;Lee, Key-Seo
    • The Journal of the Korea institute of electronic communication sciences
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    • v.10 no.8
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    • pp.875-882
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    • 2015
  • Recently, An introduction of communication based train control system both into greenfield and brownfield of urban transit network has been actively reviewed. However, since a number of line sections and rolling stock depots tends to be constructed based on track circuit for various reasons, necessity of inter-operation between two distinct train control system (CBTC, ATC) increases. Therefore, we propose a design of on-board signalling device that allows inter-operation of CBTC and ATC lines and a method to secure safe connection between these two lines without derailing point machine.

A Case Study on the Evaluation of Noise Characteristics Around the Conventional, Improved and High-speed Turnout System (기존 및 개량 고속분기기의 소음특성 평가에 대한 사례연구)

  • Eum, Ki-Young;Um, Ju-Hwan;Lee, Chin-Hyung
    • Journal of Environmental Impact Assessment
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    • v.15 no.6
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    • pp.453-458
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    • 2006
  • A turnout system which permits trains to pass from one track to another consists of the switch, the crossing, lead rails which are necessary to connect the switch and the crossing, two guard rails and a switch machine for operating the switch. A turnout is the sole moving part among the railway components and has complex configuration, so the safety has always been raised an issue. In Korea, it is planned to adopt the high speed tilting train, which operates at the maximum speed of 180km/h, at conventional lines by the year of 2010. However, for the application of the tilting train to conventional lines, it is prerequisite to establish a stable turnout system allowing the tilting train to pass through it without reducing speed. Therefore, the improved turnout system for the speed-up of conventional lines has been developed and the prototype of the turnout system has been constructed. In this study, evaluation of noise characteristics around the improved turnout system was performed through the field measurements. Field measurements of noise around the conventional and the high-speed turnout system were also carried out for the comparison.

A Study on Evaluation Method of Ride Comfort Considering Superimposition of Vertical and Horizontal Curve (종곡선과 평면곡선 경합을 고려한 승차감 평가기법에 관한 연구)

  • Um, Ju-Hwan;Yang, Sin-Chu;Kim, Eun-Kyum;Choi, Il-Yoon;Kang, Yun-Suk
    • Journal of the Korean Society for Railway
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    • v.13 no.3
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    • pp.309-316
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    • 2010
  • When the horizontal and vertical curves are superimposed in railway alignments, which affects the running stability, ride comfort, and track maintenance costs. However, when designing new lines or realigning existing ones, there are many cases of superimposition caused by the existing fixed points (bridge, tunnel, turnout, and catenary system, etc) on the conventional lines and undesirable impacts on the environment, etc. In this study, when the horizontal and vertical curves are superimposed, in order to optimize the horizontal curve in aspect of the ride comfort, the object function was developed and verified by vehicle dynamic analysis. Also, the solution algorithm for simplified evaluation method was presented.

Design of an Improved Weakly-Coupled Power Divider and a Generalized n-Way Power Divider for CATV and/or MATV Systems (CATV 및 MATV 시스템용 개량된 약결합 전력분배기와 일반화된 n-분기 전력분배기의 설계에 관한 연구)

  • Kim, Dong Il;Chung, Se-Mo;Choi, Jai Chul;Son, Jin-Hyeon;Ryu, Dea Keun;Hong, Tchang-Hee
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.24 no.1
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    • pp.115-122
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    • 1987
  • In this paper, we proposed an improved weakly-coupled power divider(TAP UNIT) for CATV and/or MATV systems, by which the degree of freedom in design and density of coupling interval are signifcantly increased compared with the intrinsic one even though the turn ratios are still of discrete values. On the other hand, the new design theory of a generalized n-way power divider with arbitrary dividing ratios, for CATV and/or MATV systems, which consists of ideal multiwinding transformers and resistors only was presented. Since the circuit elements is not frequency dependent, the proposed power divider is to be of considerably broad bandwidth. Furthermore, the experimental verification has been achieved, and, hence, the validity of the design theory proposed here is confirmed.

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