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김남포,김정석,박태원 한국철도학회 2007 한국철도학회논문집 Vol.10 No.3
The critical speed above which the vehicle become unstable is one of the items that should be verified in the development of a new train. In the case of a high speed tilting train, which requires both higher critical speed and higher curving speed, the critical speed should be more carefully treated because the both requirements are in conflict with each other in the conventional train design. The main purpose of the present work is to estimate the linear and non-linear critical speeds of 200km/h Korean Tilting Train ‘Hanbit200’ under development. The newly developed self-steering mechanism was attached to the tilting train to ensure that the critical speed falls under the lower yaw stiffness which is needed to secure higher curving performance. The simulation for predicting the critical speed was done by a commercially available vehicle dynamics software. A full scale roller rig test was carried out to validate the numerical results and to verify the effectiveness of the self-steering mechanism.
A study on the dynamic performance of the 200km/h Korean tilting train by means of roller rig test
김남포,박태원 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.4
The dynamic performances of newly developed railway vehicles should be carefully verified step by step, from computer simulation through the laboratory-based roller rig test to the main line trial running test. The laboratory-based roller rig test is an effective and safe way to evaluate the dynamic characteristics such as high speed, ride comfort and dynamic behaviors. This experimental research was performed to evaluate the dynamic performances of the 200 km/h Korean tilting train, ‘Hanvit200’, by means of a full scale roller rig test. The newly developed tilting mechanism and stabilizer were included in the tilting bogie to satisfy both the conflicting requirements of higher stability and higher curving performance. This paper shows the roller rig test results and the effectiveness of tilting bogie design. Included are the roller rig test results of various kinds of conditions such as tare and fully laden load case, normal and failed case of important bogie components, linear and non-linear critical speed.
김남포,구동회,한형석 한국철도학회 2003 한국철도학회논문집 Vol.6 No.4
틸팅 차량은 차체의 자세 제어에 의하여 승차감 저하 없이 일반 차량보다 곡선궤도를 상대적으로 빠르게 주행할 수 있는 차량이다. 틸팅 차량을 적용하면 기존의 궤도를 그대로 이용하면서 차량의 운행 속도를 증가시킬 수 있는 장점이 있어 14개국 이상에서 운행되고 있다[1-3]. 국내에서도 기존의 궤도를 이용하면서 운행 최고 속도 180 km/h로의 속도향상을 위한 방안으로 틸팅 차량이 개발되고 있다[4]. 틸팅 기구로 이용되는 방식에는 링크 방식, 베어링 방식, 센터 피봇 방식이 있는데 각각 그 특성이 다르며 전 세계적으로 링크 방식이 많이 이용되고 있다[4]. 국내선에 적용하기 위하여 개발되는 차량의 틸팅 방식도 기술적 성능과 유지보수성이 우수한 링크 방식이 고려되고 있다. 틸팅 기구의 최적 설계에 있어서 기본적으로 기구학적 검토가 선행적으로 이루어져야 한다. 기구학적 검토는 주어진 틸팅 기구의 기하학적 설계 변수와 틸팅 각의 변화에 따른 차체 및 주요한 위치 점들의 거동을 분석하는 것이다. 국내 기존선의 궤도 환경을 고려한 기구학적 검토는 무엇보다도 선행되어야할 과제이다.
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.
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.