• 한국철도학회논문집
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• 제19권3호
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• pp.288-296
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• 2016

400km/h급 전차선로가 우리나라에 시범 부설되었다. 400km/h 심플 커티너리를 설계함에 있어서 사전이도를 어떻게 해야 하는가는 관심이 집중된 엔지니어링 항목이다. 사전이도는 일정 고속 대역에서 집전성능을 향상시키는 것으로 알려져 있다. 그러나 400km/h 속도에서 효과에 대해서는 아직 정립되어있지 않다. 400km/h 커티너리에서 적절한 사전이도량을 파악하기 위하여 사전이도 0과 1/3000 조건에서 전차선과 팬터그래프 사이 동적 성능 예측 시뮬레이션을 실시하였다. 이 예측에 근거하여 400km/h 전차선로 설계에서는 0 사전이도를 채택하였다. 그리고 400km/h 전차선로 시범구간(28km)을 건설하면서 일부구간에 1/3000 사전이도 구간(약 1km)을 조성하였다. HEMU-430X 열차를 투입하여 사전이도 조성 구간을 포함하여 시범구간에서 접촉력 측정을 실시하였다. 본 논문에서는 사전이도 조성 구간과 사전이도가 없는 구간의 동적 성능(접촉력)에 대하여 기술하며 그 둘을 비교한다. 결론적으로 400km/h 전차선로에서 사전이도를 주지 않은 구간이 1/3000 사전이도 구간보다 양호한 동적(집전) 성능을 나타냄을 해석적 및 실험적 검토를 통하여 확인하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.14-19
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• 2011

Wind tunnel tests are performed so as to investigate the aerodynamic drag characteristics of HEMU-400x, next generation Korean high speed train. The experiments of 1/20 scaled 5-car train model are done at 30, 40, 50, 60m/s with a normal bogie, a bogie cover, and a streamlined shape. The flat plate with knife edge are installed to minimize the effect of boundary layer of wind tunnel for the train model. The aerodynamic drag reduction was more by a streamlined shape than by a bogie cover from a normal bogie. Based on the experimental results, the aerodynamic drag of HEMU-400x test train(6-car) was predicted. It is prediceted that More bogie cover could reduce more aerodynamic drag of the test train in replacement of normal bogies.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.35-42
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• 2011

Recently, the Next Generation High Speed Train(hereinafter HEMU-400X) which has been developing is the power distribution type high speed train. The power is on every each car and all bogies are installed on the front and rear of every car comparison with KTX and KTX-Sancheon which are consist of power cars and linkable bogies. HEMU-400X can be designed much more seats than others because there are not power car separately. However, that type has no advantage for vibration and noise due to distributed power and more faster design speed. Therefore, in this study, the design of floor construction for preventing the vibration from under the floor is considered.

• 한국소음진동공학회논문집
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• 제22권3호
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• pp.244-252
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• 2012

Recently, the speed of a train has been increased. So the trains are being exposed to wind more severely than before. Because of the operation of high speed trains and lightweight of the train, risks of train derailment have being increased. In this study, aerodynamic effects of a newly designed high speed train, HEMU-400x, are evaluated. For aerodynamic effect evaluation, analysis method is selected by examining the safety standards for high speed train. The condition of aerodynamic effects is selected by adverse effect conditions. In order to calculate $C_s$ coefficients, numerical analysis is conducted. Using $C_s$ coefficients, the side force is calculated. Through dynamics analysis, derailment and wheel unloading are obtained. Using these results, derailment evaluation is performed.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.1978-1983
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• 2008

With the increase in population, the area of human activities has expanded, resulting in the dramatic increase in the need for transportation system. Various infrastructures necessary for efficient logistics, however, have not been supplied enough and the logistics efficiency in Korea is in a bad situation now. As a result of the situation, the demand for the railroad transportation system that can provide large volume transportation has increased dramatically. An electric railway system is composed of high-tech subsystems, among which main electric equipment such as motors and converter are critical components determining the performance of electric vehicle. Among the on-board equipments, traction equipment is important part that has influence on safety and performances of vehicles. We is studied for high-speed train of foreign countries. From this research, we knows that axle weight of HEMU-400x is reasonable within 13ton.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.1779-1792
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• 2009

Now, the goal of the third generation KTX project is to create a new species of high speed train in order to open a new era of high speed railway system in history by authentic Korean technology and innovative design. Now the third generation KTX, must go beyond the original stagnant paradigm and be positioned as an emotional resource which is creating a shift in the public's perspective of transportation and expanding the idea that transportation intersects the two distinct realms of culture and environment as well. In addition, the overall design should reflect the Korean culture and characteristics, simple yet resonant, both the interior space and the exterior fuselage should portray the dynamic heritage of Korea such as the powerful yet subdued energy of Jung Joong Dong. In short, through the symbolic key words in Korean, Dong(Dynamics), Mek(Pulse), Ryu(Flow), Gam(Sensibility), the third generation KTX design project aims to create an new identity of Korean high speed railway which can stand globally.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집 특별세미나,특별/일반세션
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• pp.295-308
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• 2009

Now, the goal of the third generation KTX project is to create a new species of high speed train in order to open a new era of high speed railway system in history by authentic Korean technology and innovative design. Now the third generation KTX, must go beyond the original stagnant paradigm and be positioned as an emotional resource which is creating a shift in the public's perspective of transportation and expanding the idea that transportation intersects the two distinct realms of culture and environment as well. In addition, the overall design should reflect the Korean culture and characteristics, simple yet resonant, both the interior space and the exterior fuselage should portray the dynamic heritage of Korea such as the powerful yet subdued energy of Jung Joong Dong. In short, through the symbolic in Korean, Dong(Dynamics), Mek(Pulse), Ryu(Flow), Gam(Sensibility), the third generation KTX design project aims to create an new identity of Korean high speed railway which can stand globally.

• 시스템엔지니어링학술지
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• 제3권2호
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• pp.17-24
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• 2007

The HEMU-400X(High-speed Electric Multiple Unit 400km/h eXperiment) project starts in 2007. It is required to control and balance the systems engineering activities throughout the project life cycle for a successful completion of the project. The Systems Engineering Management Plan(SEMP) is the primary, top level technical management document for the integration of all engineering activities within the context of, and as an expansion of, the project plan. A SEMP should be prepared for each project and regularly updated as development progresses. This paper proposes the systems engineering management plan for the HEMU-400X project.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.980-985
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• 2008

Since its invention at TWI in 1991, Friction Stir Welding (FSW) has become a major joining process in the aerospace, railway and ship building industries especially in the fabrication of aluminium alloys. In an attempt to optimize the friction stir welding process of Al alloys for extrusion Aluminium carbody of HEMU-400X (Extrusion Aluminum 6xxx series), effects of joining parameters such as tool rotating speed, plunging depth and dwelling time on the weld joints properties were evaluated. Experimental tests were carried out for butt joined Al plates. A wide range of joining conditions could be applied to join Al alloys for Extrusion Aluminum 6xxx series without defects in the weld zone except for certain welding conditions with an insufficient heat input. The microstructures of welds have dynamic-recrystallized grain similar to stir zone in FSW weld. For sound joints without defects, at the rotation speed of 700 rpm with different welding speeds, the tensile strengths of the Stir Zone(SZ) were almost the same, 80% of those of the base metal. (JIS Z 2201)

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2010년도 춘계학술대회 논문집
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• pp.1483-1484
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• 2010