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This paper describes 3D Dimensional Measurement(EDM testing) and tensile testing results of carbody structure for crashed EMU(Electric Multiple Units). Tensile tests were performed on two different types of specimens in order to evaluate the strength changes before and after damages, obtained from plastic deformed area and nondeformed region of the crashed EMU. And Structural analysis of EMU was performed for the criteria of safety assessment. Structural analysis using commercial I-DEAS software provided important information on the stress distribution and load transfer mechanisms as well as the amount of damages during rolling stock crash. The testing results have been used to provide the critical information for the criteria of safety diagnosis.
This paper describes the structural deflection analysis method and result of EMU(Electric Multiple Units). During manufacturing of rail passenger coaches, the underframe is assigned a camber before it is integrated with other major assemblies of shell such as the side panel, the end panel and the roof. The camber of the positive deflection given intentionally to compensate for the sagging so that it remains straight at the maximum load. But some manufacturers have insisted there has no relationship between the camber and the safety or life cycle and they expect to reduce a manufacturing cost without a camber. So this study analyzes whether the camber influences on the safety or life cycle of EMU structure under a full load and regular driving condition. The structural dynamics model for a railway vehicle is introduced.
This paper describes the structural analysis result of accident EMU(Eleetric Multiple Units). Structural analysis of EMU was performed for the criteria of safety assessment. Structural analysis using commercial Ⅰ-DEAS software provided important information on the stress distribution and load transfer mechanisms as well as the amount of damages during rolling stock crash. Tensile tests were performed on two different types of specimens in order to evaluate the strength changes before and after damages, obtained from plastic deformed area and nondeformed region of the accident EMU. The structural analysis and tensile test results have been used to provide the critical information for the criteria of safety assessment.
도시철도 관제센터는 도시철도내 통신망, 교통망, 시설물 등으로부터 정보를 수신하고 이를 통합적으로 분석하여 도시철도를 효과적으로 운영, 관리한다. 본 논문에서는 관제시스템 관련 국내외 사례들을 조사하고, 실제사례 분석을 통하여 도시철도 관제시스템의 운영과정에서 발생하는 현안문제로 관제규모의 과다, 관리 이원화의 문제점 등을 기술하였다. 이에 대한 개선방안으로는 관제업무의 일원화, 스마트관제의 도입, 스마트 모바일 시스템 도입 등에 대한 개선방안을 제시하고자 한다. Urban railway control center receives data from communication network transport network and facilities in the urban railway and analyzes them to more efficiently run and manage the urban railway. This paper analyzes previous research and actual cases of the urban railway control system, delineating major issues that still need to be actualized.: large-scale control system, problem of control center manage duality, etc. This study proposes the following methods of improvement to resolve these problems: unification of control services, introduction of smart control system, introduction of Smart Mobile System.
Since PSD(Platform Screen Door) is set up at many subway stations, its design related to a safety becomes gradually important. Especially the intereference check with a running railway vehicle is the most important of performance indices. This study proposes a dynamic analysis models for the railway vehicle and rail. Some design parameters are considered in the models to find a correlation to the performance.
This study is aimed to review the existing urban railway master plan, and to identify a comprehensive railway network of urban railway from a stand-point of new transport policy, urban railway master plan, efficiency for urban railway operation and import of the new urban railway vehicle.
Nondestructive inspection(NDI) is a testing procedure used to easily inspect an object for internal defects abnormalities shape and structure etc. without destroying it. Typical candidates for NDI include buildings railways aircraft bridges underground pipelines and various types of factory equipment. Recent advances in nondestructive evaluation(NDE) technologies have led to improved methods for quality control and in-service inspection and the development of new options for material diagnostics. Under frame side sill in rolling stocks is designed for preventing corrosion in order to meet mechanical requirements. However during long operation time there are corrosion in the under frame side sill caused by environmental effect vibration and etc. This paper introduces the methods of a survey and assessment on NDI applications in Electric Multiple Units(EMU). The main objective of this paper was to obtain information on various applications and evaluation of NDI technology in EMU.
Currently, the use of the subway system as a public transportation has been an increasing demand due to the complex transportation structure in Korea. The subway system provides on time arrival and departure, relatively comfortable riding, and convenient access in the metropolitan area. Among several areas of the operation of the subway system, the safety of subway vehicle itself is of important because the rolling stocks carry the passengers, and the safety and reliability of rolling stocks are directly affected for the safety of subway passengers. In this research, various advanced engineering analysis techniques for the precision diagnosis assessment of subway EMUs have been introduced and the diagnosis assessment results have been used to provide the critical information for the lifetime assessment of EMUs.