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서승일,박춘수,조용현,최강윤,목진용 한국철도학회 2003 한국철도학회논문집 Vol.6 No.2
The pantograph for Korean High Speed Train was developed by home-grown technology. In this study, test and evaluation of the current collection performance of the pantograph is conducted. For this purpose, a measuring system is developed and installed on the prototype high speed train. Measurement is conducted while the train runs on the test track. The measuring system is composed of video monitoring system and telemetry & data processing system. It monitors the hazard behavior of the pantograph and measures acceleration and vertical force of the pan head. By applying the measuring system, accurate evaluation of the performance of the pantograph and safety assessment of the interface system of pantograph and catenary is facilitated.
급곡선 주행 산악트램의 거동 특성 및 설계에 관한 연구
서승일 한국산학기술학회 2022 한국산학기술학회논문지 Vol.23 No.12
A mountain tram is an eco-friendly public transportation system that runs on steep and sharp mountain roads regardless of geographic and climatic conditions. It provides transportation for residents and comport mobility for tourists. In this study, the characteristic behaviors of the cars in a mountain tram on a sharp curve with 10m radius were analyzed using a theoretical method. The method's accuracy was verified with numerical results by CAD. It was also confirmed by a 1/20-scale model test. Based on this confirmation, the performance of a tram that had 3 cars and 3 bogies was reviewed, and problems with the initial design were found so that the alternatives could be presented. It was concluded that the tram passes through the sharp curve smoothly, but relative angular displacements occurred between carbodies and between a carbody and bogie. The displacements between carbodies could be absorbed by the couper's rotation, but those between the carbody and bogie generated excessive expansion of the shaft connecting the traction motor on the carbody and the reduction gear on the bogie. This caused safety issues. To solve these problems, the initial design was changed to a tram with 3 cars and 2 bogies. After the change, the displacements did not occur, and the problems were fixed. 산악 트램은 급경사와 급곡선의 산악지역 도로 위를 지형과 기후 조건에도 구애됨 없이 운행할 수 있는 친환경 대중 교통수단이다. 지역 주민에게는 교통 기본권을 보장하고, 관광객에게는 이동 편의성을 제공해 줄 수 있다. 본 연구에서는 반경10m의 급곡선을 주행하는 산악 트램 차량의 거동 특성을 이론적 방법을 이용하여 해석하고 CAD를 이용한 수치 결과를 도출한 후, 이론적 해석의 정확성을 입증하였고, 1/20 축소 모형 시험을 통해서 확인하였다. 이를 기초로 하여 3차체-3대차 구조의 산악 트램 차량 초기 설계안에 대한 성능을 확인하고 문제점을 검토하여 대안을 제시하였다. 3차체-3대차 구조의 산악 트램 차량은 급곡선을 원활하게 주행할 수 있는 차량 시스템임을 확인하였으나, 차체와 차체 사이, 차체와 대차 사이에서 상대 각변위가 발생하였다. 차체와 차체 사이의 상대 각변위는 연결기의 회전 성능으로 흡수가 가능하나, 차체와 대차 간의 상대 각변위는 차체에 붙은 견인 전동기와 대차에 붙은 감속기 사이를 연결해 주는 추진축의 과도한 신축을 발생시켜 추진축의 안전성 문제를 초래하였다. 이 문제를 해결하기 위해 3차체-2대차 구조의 차량으로 설계를 변경한 결과, 차체와 대차 사이에 상대 각변위가 발생하지 않아 문제 해결을 확인할 수 있었다.
서승일,임영호,신동국 한국철도학회 2002 한국철도학회논문집 Vol.5 No.2
Reduction of noise level in the cabin of urban transit unit is an important issue to enhance the comfortability of passengers. It is made clear that a cause of increased noise level in cabin is the imperfect airtightness of entrance doors. In this study, the sliding-plug door system is developed to reduce the noise level of cabins by securing the airtightness of entrance door. The sliding-plug door system is composed of air-driven engine, swing arms, guide rails, guide rollers and locking devices. It is economical owing to using the previous door engine system. It is also adequate for the platform system of our subway station. It was tested to prove the reliability of system and was applied to standard urban transit unit. The effectiveness of noise reduction in cabin resulting form the sliding-plug door system was confirmed by test results.
Development of technologies for mountain trams driven through sharp curves
서승일,문형석 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.5
The mountain tram is an environmentally friendly transportation system that is driven wirelessly on an embedded track constructed on former mountain roads. While it has a number of strong points, including being able to be driven in spite of a frozen road, some difficulties are caused on sharp and steep tracks. In this study, after possible technical problems were defined in mountain trams driven on sharp and steep tracks, design solutions for the coupling structure of bogie and car body were proposed. In addition, a prototype was made and its performance was tested to verify the solution. Since the distance difference of inner and outer rails on the sharp curve is severe enough to interrupt running, independently rotating wheels with different angular speeds were developed and applied. To prevent derailment due to large attack angle and lateral force caused by the previous vehicle in a 2-bogie-1-carbody design on a sharp curve, a 1-bogie-1-carbody vehicle was designed and applied. A prototype 1-bogie-1-carbody vehicle with independent rotating wheels was made to prove the performance during test drives on a small track. To absorb the large rotations of 3 degrees-of-freedom between the car bodies of a mountain tram driven on the steep curved track, a coupler was designed. After a small scale prototype was made, the performance was verified through a function test.