• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 추계학술대회 논문집
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• pp.793-798
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• 2005

The performance functions of a suspension must provide often place conflicting demands upon rail bogie design since design parameters which may be altered to improve performance in one area may simultaneously reduce performance in another area. To determine compromised design parameters, it is need to carry out a number of simulations and trade-off studies. The suspension design system based on computer simulations is presented. The system is composed of analysis solvers and GUI which have functions such as modeling, analysis and sensitivity analysis.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.1794-1798
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• 2008

Inside noise level of a running train in open field is the summation of air borne noise and structure-borne noise. Anti-roll bar is the major transmission path of vibration from bogie. And this vibration gives an effect to the structure borne noise. In this paper, the effect of anti-roll bar is investigated. Structure borne noise is analyzed in terms of changing the mounting position of anti-roll bar to reduce inside noise levels.

• 한국소음진동공학회논문집
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• 제22권8호
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• pp.713-719
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• 2012

This paper deals with the natural frequency analysis and two experiments to evaluate first twisting and bending natural frequency of railway vehicle. The KS R 9228 testing method is generally performed as pseudo FRF(frequency response function) which is widely used by two accelerometers. The exciting method is utilized using the load weight(1 ton release). The modal testing is used to verify KS R 9228 testing result and the natural frequency analysis result. The first twisting and bending natural frequency should be above 10 Hz by resonance which is mostly generated between bogie and vehicle frame exciting low frequency. The first twisting and bending natural frequency of railway vehicle are successfully verified between analysis and test.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2004년도 추계 학술대회논문집
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• pp.177-180
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• 2004

The development of a tilting train with construction of electric line on the conventional railway is required for speed-up on the conventional railway with many curving sections. For development of tilting train, the study and development of the tilting system and tilting bogie having the different mechanism with a general high speed train will play a main role for improving the technology in the field of Korean railway The study and development of the pantograph tilting mechanism in order to keep a good contact behavior between a pantograph and a contact wire by tilting a pantograph on the opposite direction of the vehicle tilting direction. In this study, we analyzed the aerodynamic characteristic of a developing pantograph on the tilting train and obtained the contact force with catenary by aerodynamic lift force by the aerodynamic analysis. We also performed the numerical analysis for design the device controlling lift force on a pantograph. From the aerodynamic simulation and parameter study for a device to control the lift force, we will suggest the various shape and the optimal shape of it corresponding to a developing tilting pantograph. The Fluent software is used for the calculation of flow profile in this study.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.467-471
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• 2004

The development of a tilting train with construction of electric line on the conventional railway is required for speed-up on the conventional railway with many curving sections. For development of tilting train, the study and development of the tilting system and tilting bogie having the different mechanism with a general high speed train will play a main role for improving the technology in the field of Korean railway. The study and development of the pantograph tilting mechanism in order to keep a good contact behavior between a pantograph and a contact wire by tilting a pantograph on the opposite direction of the vehicle tilting direction. In this study, we analyzed the aerodynamic characteristic of a developing pantograph on the tilting train and obtained the contact force with catenary by aerodynamic lift force by the aerodynamic analysis. We also performed the numerical analysis for design the device controlling lift force on a pantograph. From the aerodynamic simulation and parameter study for a device to control the lift force, we will suggest the various shape and the optimal shape of it corresponding to a developing tilting pantograph. The Fluent software is used for the calculation of flow profile in this study.

• 한국철도학회논문집
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• 제17권1호
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• pp.19-27
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• 2014

도시철도는 도심내를 운행하는 철도차량으로써, 도시철도 이용이 활발해지고 운행 계획에 따라 급곡선 구간의 운용이 필요할 것으로 예상된다. 하지만 이러한 급곡선 선로에서는 철도차량의 주행 안정성이 현저히 감소하며 크리피지가 증가하게 된다. 크리피지는 차륜이 레일 위를 구를 때 접촉면에서의 속도차에 의한 미끄러짐 량으로 차륜 마모, 진동 등의 원인이 된다. 따라서 크리피지를 줄이는 것은 주행 안정성 확보 및 환경 문제, 비용 저감에 도움을 줄 수 있다. 본 논문에서는 급곡선 선로 주행에 의한 주행방향 크리피지 발생 정도를 전동차를 모델링하여 분석하고 나아가서 급곡선 선로 주행 시 발생할 수 있는 문제점을 최소화하기 위한 대차 특성을 최적화한다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.1856-1861
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• 2011

As a secondary suspension, the air spring has not good lateral stiffness characteristics. In order to make up for this weak point, lateral damper is used between bogie and carbody. The lateral vibration of carbody can be reduced by the lateral damper. When the damping force of lateral damper becomes worse, the running stability and ride comfort of the railway vehicle go down. Simultaneously the lateral motion of carbody is increased. In this study, the lateral displacement of carbody was studied by the multibody dynamic analysis in accordance with lateral damping force to find the cause of abnormal noise(impact noise) when the vehicle is running. The suitable lateral damping force was reviewed in order not to generate abnormal noise.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 춘계학술대회 논문집
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• pp.773-777
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• 2004

The variable-gauge wheelset drives on the variable railways. It doesn't need to replace or move the carriages to another bogie parts. This paper is for dynamic analysis of the variable-gauge wheel set. 3D-Virtual Mock-up. program was developed to verify the operating mechanism and understand dynamic characteristics for German RAFIL- V variable-gauge wheel set. When the system is going through the width-variable railway, its safety depends on the stiffness and velocity. So the numerical and contact model of this system were developed. This solution is useful to analyze dynamic characteristics for variable-gauge wheelset.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 춘계학술대회 논문집
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• pp.798-803
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• 2004

The development of tilting train is required for speedup on the conventional electric railroad due to the characteristic of Korean railroad with a lot of curve track. The study and development of a tilting system and a tilting bogie which have a different mechanism with high speed train will playa important role for enhancement of technology for Korean railway. The study for tilting pantograph mechanism to decrease the displacement between a catenary and a center of pantograph happened when the carbody is tilted in order to maintain the ride comfort and stability on a curving track is proceeding with the development of tilting train. In this paper. we introduce the design concept for the tilting mechanism of a tilting pantograph and the role and characteristics for several devices adopted in the tilting pantograph mechanism. Through the kinematic analysis of tilting mechanism. we will obtain and calculate the optimal tilting angular velocity and acceleration in order to keep the contact behavior of a pantograph and a catenary according to tilting of a carbody.

• 한국철도학회논문집
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• 제8권3호
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• pp.253-259
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• 2005

This paper describes 3D Dimensional Measurement(EDM testing) and tensile testing results of carbody structure for crashed EMU(Electric Multiple Units). Tensile tests were performed on two different types of specimens in order to evaluate the strength changes before and after damages, obtained from plastic deformed area and nondeformed region of the crashed EMU. And Structural analysis of EMU was performed for the criteria of safety assessment. Structural analysis using commercial I-DEAS software provided important information on the stress distribution and load transfer mechanisms as well as the amount of damages during rolling stock crash. The testing results have been used to provide the critical information for the criteria of safety diagnosis.