• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 2008.04a
• /
• pp.561-566
• /
• 2008

Recently, because of development of the high speed train technology, the vibration loads by train is significantly increased ever than before. This buried gas pipelines are exposed to both repeated impact loads, and, moreover, they have been influencing by vibration loads than pipeline which is not located under vehicle loads. The vibration characteristic of pipeline is examined by dynamic analysis, and variable is only train speed. Since an effect of magnitude of vibration loads is more critical than cover depth, as increasing the train speed, the vibration speed of buried pipelines is also increased. The slope of vibration velocity is changed by attenuation of wave, at train speed, 300 km/h. From the analysis results, the vibration velocity of pipelines is satisfied with the vibration velocity criteria which are established by Korea Gas Corporation. The results present operation condition of pipelines under rail loads has fully sound integrity based on KOGAS specification.

• Proceedings of the KSME Conference
• /
• 2001.06e
• /
• pp.341-348
• /
• 2001

The purpose of present study is to investigate for reducing pressure fluctuations in the case of installing the air-shafts on the side wall of the tunnel with small cross-sectional area on conventional line. Experiments were performed with a 1/61-scale moving model rig for the tunnel of 0.764 km length in the condition of tunnel cross-section area of $28 m^2$. According to the results, the maximum pressure fluctuation is reduced by 45 % for 19 air-shafts. This results have the speed-up effects of about 33.4 km/h for the train running in tunnel.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2009.06a
• /
• pp.478-479
• /
• 2009

The HEMU-400X(High-speed Electric Multiple Unit 400km/h eXperimental) project starts in 2007. It is required to analysis and simulate the train performance throughout the project life cycle for a successful completion of the project. This paper is devoted to the development of a train performance analysis model for the high-speed electric multiple unit 400km/h experimental. The model consist of running resistance model, train model, traction model and braking model. So, this paper represents the results of the train performance analysis.

• Proceedings of the KIEE Conference
• /
• 2003.10b
• /
• pp.275-277
• /
• 2003

Computer aided simulation is becoming an essential part in planning, design, and operation of railway systems. To determine the adequate performance and specification of railway system, it is necessary to calculate rolling stock's performance such as distance, speed, power etc when train's running. This paper presents result of train performance simulation using the program that developed in advance for Korea high speed train. To verify result of simulation, we have compared that with experiment data.

• Proceedings of the KIEE Conference
• /
• 2011.07a
• /
• pp.1260-1261
• /
• 2011

LSM기반의 초고속자기부상열차는 고전압, 대전류의 추진 전력을 공급할 수 있도록 설계되어진 특수한 형태의 추진 인버터와 주행시 부상공극변동에 대해서도 강인한 부상특성을 제공할 수 있도록 개발된 부상제어시스템이 필요하다. 본 논문은 550km/h급 초고속자기부상 시스템에 대한 설계기술의 확보를 위한 것으로, 실 규모시스템 구현에 앞서 축소모형으로 각각의 시스템 구성품을 개발하되 실규도 시스템에 적용하는 방식의 2스텝의 추진용 인버터시스템과 전류원 초퍼기반의 부상시스템 토플로지를 구성하고 그 제어특성의 시험 및 평가를 위해 시뮬레이션을 수행하여 그 가용성을 확인하였다.

• Proceedings of the KIEE Conference
• /
• 2003.11b
• /
• pp.95-98
• /
• 2003

Computer aided simulation is becoming an essential part in planning, design, and operation of railway systems. To determine the adequate performance and specification of railway system, it is necessary to calculate rolling stock's performance such as distance, speed, power etc when train's running. This paper presents result of train performance simulation using the program that developed in advance for Korea high speed train. To verify result of simulation, we have developed measurement system and compared simulation result with experiment data.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 1998.04a
• /
• pp.102-107
• /
• 1998

UTM-01 is the first fall sized maglev test vehicle which is being developed by KIMM and Hyundai Precision and Industrial Co., since 1995. The vehicle employs normal conducting magnets for levitation and single sided linear induction motor for propulsion. The test vehicle has been under tests to assure its required performance since last May 1997. This paper reports various system level test results compared with simple 2 degree of freedom dynamic calculations. Test results include performance of the levitation and guidance system, propulsions system, and the dynamic behavior of the elevated guideway under the passage of the maglev vehicle.

• Proceedings of the KSR Conference
• /
• 2004.06a
• /
• pp.883-888
• /
• 2004

Pressure waves are generated when high speed train runs through the tunnels. These pressure waves not only affect passenger's health, but also can cause fatigue failures on the vehicle structure. The current high speed train should run on the conventional lines. In this study, pressure fluctuations by the high speed trains such as G7 Korea High Speed Train and Korea Train eXpress are measured in the cabin and the carbody surface when they pass through the tunnels. The measured results are analyzed and the related parameters are investigated.

• 연구논문집
• /
• s.27
• /
• pp.5-13
• /
• 1997

Test results of urban transit maglev system(UTM-01) are reported. Maglev project team in KIMM, in cooperation with Hyundai Precision Company and the Korea Electric Research Institute(KERI), has been developing a prototype urban transit vehicle since 1995. Since last May, we have been trying to improve performance of the first vehicle UTM-01 both in levitation and propulsion systems. In this paper, we report various test results of the vehicle UTM-01, present status and future prospect, and what have been done so far to assure its required performance.

• 연구논문집
• /
• s.27
• /
• pp.15-34
• /
• 1997

The 3-dimensional unsteady compressible flows around the high speed train have been simulated for the train entering a tunnel and for passing another train. The simulation method employs the implicit approximation-factorization finite difference algorithm for the inviscid Euler equations in general curvilinear coordinates. A moving grid scheme is applied in order to resolve the train movement relative to the tunnel and the other train. The velo-city and pressure fields and pressure drag are calculated to study the effects of tunnel and the other train. The side directional force which is time dependent is also computed for the passing train. Pressure distribution shows that the compression wave is generated in front of the train noise just after the tunnel entrance and proceeds along the inside of tunnel.