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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.
레이저 센서를 이용한 철도차량 대차프레임의 자동 평면 포지셔닝 기술 개발
서승일,김정국,남성원 한국비파괴검사학회 2023 한국비파괴검사학회지 Vol.43 No.3
In this study, an automatic plane positioning technology for a railway bogie frame was developed using a laser sensor, and its prototype was manufactured to verify its performance. Ensuring a flat plane when measuring, machining, and fabricating a bogie frame is essential for improving the structural safety and quality of the bogie. Previously, a manual height adjustment device was used for plane positioning of the bogie frame, but improvements were needed in terms of precision, working risk, and efficiency. The developed automatic plane positioning system consists of a three-dimensional laser tracker, laser sensor to measure height, servo motor to automatically adjust height, control and communication system using PLC, monitoring system for input and output visualization, and precise base. The system measures the height at four reference points of the bogie frame, calculates the plane target, and automatically adjusts the height of the bogie frame to ensure that the four reference points form a plane. An authorized test proved that the flatness error of the reference point was within 0.5 mm, which is more precise than the existing technology. In addition, the working time was reduced to 1/6 compared to that of the previous technology, resulting in increased efficiency. The developed system can be effectively used for plane positioning of various structures such as automobile frames, plants, and industrial machinery. 본 연구에서는 레이저 센서를 이용하여 철도차량 대차프레임의 평면 자동 포지셔닝 기술을 개발하고 시제품을 제작하여 성능을 검증하였다. 대차프레임에 대한 측정, 가공, 조립 등의 공정에서 수평도 확보는 구조 안전성과 품질 향상에 필수적이다. 기존에는 대차프레임의 평면 포지셔닝을 위해 수동 높이 조절 장치를 사용하였으나 정밀도, 작업 위험도, 효율 등의 측면에서 개선이 필요하였다. 개발한 자동 평면 포지셔닝 시스템은 3차원 레이저 트래커, 레이저 센서를 이용한 높이 측정 장치, 서보모터를 이용한 자동 높이 조절장치, PLC를 이용한 제어 및 통신시스템, 입출력 가시화를 위한 모니터링 시스템, 정밀 정반 등으로 구성되어 있다. 본 시스템은 대차프레임 4개 기준점에서 높이를 측정하고 평면 목표값을 계산한 후, 자동으로 높이를 조절하여 4개 기준점이 평면이 되도록 대차프레임을 자동으로 포지셔닝한다. 국제 공인 시험을 통해 평면포지셔닝 성능을 검증한 결과, 기준점 수평도 오차는 0.5 mm 이내로서 기존 기술에 비해 정밀도가 월등히 우수하며, 작업 시간도 기존 대비 1/6로 단축되어 효율성도 뛰어남을 알 수 있었다. 개발 기술은 자동차 프레임, 플랜트, 산업기계 등 다양한 구조체의 평면 포지셔닝에 효과적으로 활용될 수 있다.
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.
서승일,최성호,임영호,이정수 한국철도학회 1999 한국철도학회논문집 Vol.2 No.3
In this paper, design and construction process for the standardized electric motor car according to standard specification is described. Aluminum extrusion profiles and power and control system made domestically are used in the electric motor car. Also, plug-sliding door system for noise reduction and automatic train control system are developed and applied. Through the development of the electric motor car, most electric and control systems can be substituted by domestic standard systems, and safety and reliability of electric motor cars can be secured.
서승일,노재규,이정수 대한용접접합학회 2002 대한용접·접합학회지 Vol.20 No.5
To prevent problems caused by welding deformation, preparation in the design stage is necessary. Countermeasures in the design stage is also the most cost-effective method. In this study, to give designers information on the welding deformation, a system to visualize the welding deformation is developed. The model to visualize the deformation is the stiffened plate common in steel structures. To increase computational efficiency, theoretical solutions to calculate the deformation of plate and stiffener are used instead of numerical analysis. Also, to secure accuracy, experiments to estimate bending moment causing welding deformations are performed. A computer program written with Visual C++ is developed for interactive data input, calculation of welding deformation and display of deformed shape. Designers can change the design in the early stage after checking the deformed shape by this system.