• 제목/요약/키워드: multi-train

검색결과 344건 처리시간 0.027초

Study of ground vibration induced by high-speed trains moving on multi-span bridges

  • Ju, S.H.
    • Structural Engineering and Mechanics
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    • 제59권2호
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    • pp.277-290
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    • 2016
  • This paper investigates the ground vibration induced by high-speed trains moving on multi-span continuous bridges. The dynamic impact factor of multi-span continuous bridges under trainloads was first determined in the parametric study, which shows that the dynamic impact factor will be large when the first bridge vertical natural frequency is equal to the trainload dominant frequencies, nV/D, where n is a positive integer, V is the train speed, and D is the train carriage interval. In addition, more continuous spans will produce smaller dynamic impact factors at this resonance condition. Based on the results of three-dimensional finite element analyses using the soil-structure interaction for realistic high-speed railway bridges, we suggest that the bridge span be set at 1.4 to 1.5 times the carriage interval for simply supported bridges. If not, the use of four or more-than-four-span continuous bridges is suggested to reduce the train-induced vibration. This study also indicates that the vibration in the train is major generated from the rail irregularities and that from the bridge deformation is not dominant.

자동차 파워트레인 샤프트 가공용 8축 복합가공기 베드의 유한요소 해석에 관한 연구 (A Study on the CAE Analysis of Bed of Multi-Tasking Machine for Automotive Power Train Shafts)

  • 조준현;문동주;이종찬
    • 한국기계가공학회지
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    • 제14권1호
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    • pp.9-14
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    • 2015
  • To build a high precision machine tool and increase its productivity, structural analysis needs to be carried out for vibration and stiffness of the machine tools before any detailed design. Therefore, in this paper, static and dynamic analysis is carried out to evaluate 8-axis multi tasking machining beds for automotive power train shafts; then, selection of an appropriate device is made for application to bed design. The results of structural and modal analysis confirmed the structural characteristics of the 8-axis multi tasking machine for automotive power train shaft beds: and the second shape bed is the safest is considered secure.

다중열차 시뮬레이션을 위한 철도시스템 모델 (Railway System Model for Multi-Train Traffic Simulator)

  • 김동희;김성호;오석문
    • 한국철도학회논문집
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    • 제4권2호
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    • pp.47-54
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    • 2001
  • Railway companies have been faced with many changes in the railway environment. To cope immediately with the influence of environment and to improve productivity, an efficient train operation system and related core technologies must be introduced. The railway system is composed of large scale infrastructures and high-cost trains. Simulation method is one of core technologies and also efficient tool for planning and analyzing these kinds of complex system. In this research, we review basic simulation programming models and present a modeling for the elements of railway system such as rail-line infrastructure, train, time table and operational route. Additionally, some considerations on the development of multi-train traffic simulator for KyongBu-line are discussed.

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다중 열차 운용시뮬레이션 알고리즘에 관한 연구 (The Study on the Algorithm of Multi-Train Operation Simulation)

  • 최규형;구세완
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 A
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    • pp.477-479
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    • 1999
  • This paper proposed train operation simulation algorithm, algorithm to determining operational mode and algorithm for train performance program, which play a important role in multi-train operation simulation. Using railway network modelling and signalling systems modelling already developed, these algorithms was presented.

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불요신호 특성이 우수한 다기능레이더 신호처리기 개발 (The Development of the Multi-function Radar Signal Processor Having the High Spurious Free Dynamic Range)

  • 이희영
    • 한국군사과학기술학회지
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    • 제13권1호
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    • pp.140-146
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    • 2010
  • The multi-function radar can detect and track the low RCS targets. For this purpose the multi-function radar uses the pulse train waveform. because this waveform has high dynamic range and good SNR(Signal to Noise Ratio). But the spurious signals can also be detected by processing the pulse train waveform. Thus the multi-function radar signal processor must have the high SFDR(Spurious Free Dynamic Range). This paper describes the development of the multi-function radar signal processor having the high SFDR.

AT 급전계통 해석 알고리즘 연구 (A Study Algorithm of AT Feeding Systems)

  • 추동욱;김재철
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제51권4호
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    • pp.174-179
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    • 2002
  • In this paper, the modified simulation algorithms of the Auto Transformer (AT) feeding electric train system were proposed. To obtain terminal voltage of train by using equivalent circuit or the AT feeding system, the iterative method is proposed for which determine the train voltages. The train voltages are iteratively calculated from the system voltage drop and line impedance. In the carte study, the proposed method is verified from actual operation data of the Kwa-Chon line. Also it is verified that the proposed method can be extent to the multi-train simulation tool. The terminal voltage of the multi-train can be calculated by using superposition principle and it is easily applied to the proposed method. Therefore, the proposed method can be a solution for the complexity of the circuit analysis in the existing methods.

터널에 진입하는 고속전철 주위의 3차원 점성유동과 압축파 특성에 관한 수치해석적 연구 (Numerical study of Three-Dimensional Viscous Flow and Compression Wave Induced by the High Speed Train Entering into a Tunnel)

  • 신창훈;박원규
    • 한국전산유체공학회지
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    • 제5권3호
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    • pp.23-31
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    • 2000
  • The three-dimensional unsteady compressible Full Navier-Stokes equation solver with sliding multi-block method has been applied to analyze three dimensional characteristics of the viscous flow field and compression wave around the high speed train which is entering into a tunnel. The numerical scheme of AF + ADI was used to efficiently solve Navier-Stokes equations in the curvilinear coordinate system. The vortex formation owing to the viscous interaction around the train was found and the generation of compression wave due to the blockage effects was observed ahead of the train in the form of plane wave. The three dimensional characteristics of the flow field compared to the analytic results were discussed in detail. The variation of pressure of tunnel wall surface and velocity profile of the train are identified as the train enters into a tunnel. The changes in aerodynamic forces and streamlines of each specific sections are also discussed.

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AT 급전계통 전기철도 해석 알고리즘 연구 (A study on algorithm of AT feeding systems)

  • 추동욱;김재철;김낙경
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 하계학술대회 논문집 B
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    • pp.1226-1228
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    • 2001
  • In this paper, the modified simulation algorithms of the Auto Transformer (AT) feeding electric train were proposed. To obtain terminal voltage of train by using equivalent circuit of the AT feeding system, the iterative method is proposed for which determine the train voltages. The train voltages are iteratively calculated from the system voltage drop and line impedance. In the case study, the proposed method is verified from actual operation data of the Kwa-Chon line. Also it is verified that the proposed method can be extent to the multi-train simulation tool. The terminal voltage of the multi-train can be calculated by using superposition principle and it is easily applied to the proposed method. Therefore, the proposed method can be a solution for the complexity of the circuit analysis in the existing methods.

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AT 교류 철도급전계통 내 다수 열차 운행시 새로운 계통해석 알고리즘 연구 (Applying New Algorithm on AC Auto-Transformer Feeding System under Multiple Trains Operating)

  • 전용주;추동욱;전명수;임성정;김재철
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2000년도 추계학술대회 논문집
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    • pp.712-719
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    • 2000
  • This paper presents a new algorithm to analyze a train voltages of multi-trains in auto-transformer-fed AC railway systems, using electrical equivalent change. The train current will be divided into circulation and return currents, and these current values are the same. By evaluating each current independently, the result will be more precise. The train current flows through the all auto-transformer corresponding to track impedance. In analyzing the railway system, the algorithm is based on the K.C.L, K.V.L, superposition and circuit separation method. Multi-train's voltages are determined by calculating the catenary voltage at each train's position and adding up these train's voltage drop. Case studies use a field operational data, show that tile proposed method is easily applied.

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무선통신 기반의 열차제어시스템 성능 향상을 위한 Alamouti 방식 적용에 관한 연구 (The Study of Alamouti Transmission for Improvement of Wireless Communication Based Train Control (CBTC) System)

  • 안윤섭;김동호;정득영
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2010년도 춘계학술대회 논문집
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    • pp.1680-1684
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    • 2010
  • CBTC(Communication-Based Train Control) system which is based on wireless communication can provide high density operation of the train using location tracking between ground and onboard train. It can also reduces maintenance expense because it does not require the ground equipment for tracking circuit and signal flag and so on. Recently, research and interest have been done on CBTC system. The high-speed trains up to 300km/h experience multi-path fading channel which bring about the performance degradation of wireless CBTC system. In this paper, we consider MIMO (Multi-Input Multi-Output) antenna-based CBTC system for trains with Alamoutip-type space-time diversity transmission for reliable communication. Also we model a channel considering practical environment and evaluate performance improvement of proposed CBTC system.

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