• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2001.05a
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• pp.1015-1021
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• 2001

This paper represents the results carried out to determine the dynamic response characteristics of Korea High Speed Rail(KHSR) bridges. The responses of the KHSR bridges subjected to the moving train loading are obtained through the simplified method for the 2-dimensional train/track/bridge interaction analysis in which the eccentricity of axle loads and the effect of the torsional forces acting on the bridge are included for the more accurate train/track/bridge interaction analysis. The results of the analyses are compared with the field test data to verify the performance of the 2-dimensional train/track/bridge interaction analysis method.

• Proceedings of the KSR Conference
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• 2005.05a
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• pp.544-549
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• 2005

To maintain the stability during the operation of railway vehicle, the perfect installation of rail, namely the orbit as well as the performance of the railway vehicle itself is required. The orbit of railway needs the intensity and elasticity that stands the shock and vibration due to the weight of the railway vehicle enough. Also, the driving safety during the operation of vehicle should be guaranteed, comfortable feeling of the passenger should be maintained, and the influence of the noise and vibration to the environs should be minimized. Therefore, it is necessary to develop a program that calculates the change of construction cost according to the selection of railway orbit. This study introduces the orbit design automation program according to the selection of railway orbit, and discuss the principle and the way to use of the program.

• Proceedings of the KSR Conference
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• 2005.05a
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• pp.568-573
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• 2005

To the installed CWR (Continuously Welded Rail) on steel plate girder bridges without ballast, shoes were replaced by the shoe for reduced axial force. During 9 months, from summer to winter, expansion by a temperature on girders, axial forces by a temperature on CWR, etc. are tested and the results are evaluated. Also, with the numerical analysis, the results - axial forces by a temperature on CWR, deformations of girders, etc. are compared and evaluated. From the longitudinal displacement on girders, occurred by run of trains, because of looking for the stability, the bearings for reducing axial forces are applied to the railway bridges. It is verified that the bearings for reducing axial forces disperse the axial forces by a temperature from the measurement of the forces on CWR of plate girder bridges,.

• Proceedings of the KSR Conference
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• 2005.05a
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• pp.127-131
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• 2005

The running test for the Korean High Speed Train(HSR-350x) was performed at operating maximum sped(350km/h) at December 16th, 2004. HSR-350x had been fabricated in June, 2002 and the on-line test for the performance fo HSR-350x was started with 60km/h at August 19th, 2002. The success of running test at 350km/h is recorded the 4th rank in the world. In this paper, the measured results of the major performance(running behaviour, current collection, stability of rail and bridge) characteristics for HSR-350x are reviewed. All measured values are within the criteria.

• Proceedings of the KSR Conference
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• 2005.05a
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• pp.706-711
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• 2005

From the using CWR (Continuously Welded Rail) on steel plate girder bridges without ballast, axial forces are occurred from a temperature on CWR and girders. Because of the additional axial forces, studies in order to CWR and developments of devices are proceeding. The track system of steel plate girder bridges is poor. When CWR is used for the system, the resistance on sleepers is increased from a temperature. So it is increasing an effect on CWR and, for solving the effect, longitudinal forces for buckle are being decreased. It is possible that opposite cases can be happened and it is also compared and studied. Therefore, we present a reasonable model for analyzing CWR within the property of steel plate girder railway bridges in Korea. Furthermore, the results analyzed for stability is compared and evaluated with tests. Finally, a reasonable method for the installation of CWR on bridges without ballast is suggested.

• Proceedings of the KSR Conference
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• 2007.05a
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• pp.715-721
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• 2007

On a conventional rail vehicle, passive primary suspensions stabilize wheelsets in the longitudinal and yaw direction. However, these suspensions reduce the natural curving ability due to the profile of the wheels. Stabilizing and steering of the wheelsets generate the conflict problems in design process. Therefore, most systems are designed to guarantee the stability in spite of decreased curving performance. As a result, severe wear of the wheels and rails occur on tight curves and squeal noise on curving is high. Active steering has been proposed to satisfy stabilizing and steering performance simultaneously. This paper describes the possibility investigation about the application of the active steering bogie for a urban railway vehicle. Vehicles run on an amount of tight curves at mid or low speed in urban railways. Thus, it is important to reduce the wear and squeal noise between wheels and rails. Simulations show that active steering can be reduce the wear and squeal noise significantly compared to conventional systems.

• Proceedings of the KSR Conference
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• 2007.05a
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• pp.1746-1751
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• 2007

The bullet train runs more than 200km/h so that it is invisible to the naked eye. For this reason, KTX solely dependent on the ATC operation system. Above all things, 'stability' and 'regular time' are essential to Train Control Operation system. But intermittently, there is a signal transmission problem between ATC operation facilities and ground equipments. which is caused by wheel sliding and friction coefficient between wheel and rail when the train starts. This paper analyzed train service data for one year for accurate survey. In addition, this thesis examines the main cause of a signal transmission problem through simulation and experiment. Further, the method to solve the conventional problem is presented.

• Proceedings of the KSR Conference
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• 2007.05a
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• pp.964-967
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• 2007

Tilting trains are now an established feature of railway operations throughout the world. For intercity traffic, tilt provides operators with increasing speeds, and therefore enhanced competitiveness, on existing routes where insufficient traffic or a lack of funds precludes the construction of a dedicated new high-speed railway. Appling the tilting train, we can expect 30% of speed up on existing lines, but the stability of the electric current would be low because of tilting the train. Also, the spark between the catenary and pantagraph cause environmental problems such as noise, radio wave malfunction. Therefore, the tilting on pantagraph for the power suppling device is very essential for stable electric power supply.

• Proceedings of the KSR Conference
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• 2008.06a
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• pp.1024-1031
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• 2008

The performance of magnetic levitation controller is affected from not only levitation control algorithm but also the interaction between compositing system, so it is important to design maglev system considering the character of magnetic levitation controller in order to get the required performance of Maglev. The factors affecting the levitation controller of maglev are the dynamics of levitation magnet, the carrying weight of the overall system, the normal force and lateral force of traction motor and rail condition. In this paper the interaction between magnet and vehicle weight is analysed on side of stability of levitation controller in order to get the required performance of levitation controller.

• Proceedings of the KSR Conference
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• 2008.06a
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• pp.1672-1675
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• 2008

The track is an important component of rail structures. The characteristic of the track settlement must be confirmed in order to evaluate the stability of the track. It is effected by action load and the characteristic of the track material. This study investigates the mechanism of the track settlement and the effect of initial settlement and long-term settlement on the characteristic of the track settlement through literature survey. It tries to observe the future research direction of track settlement.