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김남포(Nam-Po Kim),구동회(Dong-Whe Koo),한형석(Hyung-Suk Han) 한국철도학회 2003 철도저널 Vol.6 No.4
Using a conventional railway, a tilting train was applied as a means of improving vehicle speed during curve negotiation without any modification of infrastructure. As a study for the optimum design of the tilting mechanism of a tilting vehicle, the kinematics sensitivity of the tilting mechanism was analyzed. Using the geometric relationship of the linkage-type tilting mechanism, the relationship of the parameters and the performance index was defined using nonlinear algebraic equations. With the defined relation, the effect of change in the parameters on the performance was analyzed. The analysis result can be used in the optimum design of a tilting mechanism that considers the track environment, vehicle and operational condition in which the tilting vehicle is applied.
김남포,서승일,김정석,Kim, Nam-Po,Seo, Sung-Il,Kim, Jung-Seok 한국철도학회 2006 한국철도학회논문집 Vol.9 No.2
In this study, overturning safety for a tilting train has been evaluated. In the tilting train, the overturning safety is one of the most important factors because the carbody inclines inward a curve during curve negotiation. Dynamic analysis considering unbalanced lateral acceleration and carbody tilting has been carried out and the overturning safety for the tilting train has been evaluated according to height of CG of carbody. From these studies, the overturning safety for the tilting train under unbalanced lateral acceleration of $2m/s^2$ was superior to the conventional one at the same running speed.
김남포(Nam-Po Kim),김정석(Jung-Seok Kim),서승일(Sung-Il Seo),이수길(Su-Gil Lee),박태원(Tae-Won Park) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The bogie is the one of the most important components in a railway vehicle, as it is to support the car body and to guide the vehicle to the rails, to provide running stability, safety against derailment, better ride comfort, better curving performance. The tilting bogie is the bogie which include the tilting mechanism and tilting actuator within it and the tilting bogie should provide the better curving performance, better stability and ride comfort than conventional bogie as the tilting train run curve track almost 30% faster than conventional train. This paper described the dynamic characteristics of the tilting bogie which was developed as a part of the Korean National R&D project, 200㎞/h tilting train development for the speed-up of conventional railway lines.
180㎞/h급 한국형 틸팅차량의 대차후레임 구조해석 및 평가 연구
김남포(Nam Po Kim),문형석(Hyung Suk Mun) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
Korea Railroad Research Institute(KRRI) have been developing Korean Tilting Train eXpress(TTX) with the service speed of 180㎞/h as the R&D project supporting by Korea government. The core of research is the development of the tilting bogie using the domestic tilting technologies. We developed the 3D-CAD prototype of tiling bogie model. In this paper we attempted to evaluate the structural strength of bogie frame using the Finite Element Method. Finally, we would like to propose the application of the modifying part to the detail design.
김남포(Kim Nam-Po),김정석(Kim Jung-Seok),박태원(Park Tae-Won) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
The critical speed above which the vehicle become unstable should be fundamentally verified in the development of new train. In case of high speed tilting train, which require both higher critical speed and higher curving speed, the critical speed should be more carefully treated because the both requirements are conflicting each other in the conventional train design. This research has been performed to estimate the linear and non-linear critical speed of 200㎞/h Korean Tilting Train which has been developing. The newly developed self-steering mechanism was attached to the tilting train to secure critical speed under the lower yaw stiffness which was inevitable to secure higher curving performance. The simulation to predict critical speed was done by commercial vehicle dynamic S/W. Full scale roller rig test was carried out for the validation of numerical results and effectiveness of self-steering mechanism.