• Title, Summary, Keyword: Subway Electric Train

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Vibration Analysis and Mitigable Countermeasures of Semi High-speed Subway Electric Trains (준고속 도시철도의 진동분석 및 저감대책)

  • Park, Ki-Soo;Choi, Yeon-Sun
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.18 no.10
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    • pp.1014-1023
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    • 2008
  • Subway electric trains need to be faster for accommodation of long distance passengers. The faster run of the existing trains results in deterioration of ride quality due to noise and vibration. To reduce the noise and vibration of the electric train, a running test of the electric train was performed and an ADAMS/Rail model was set up to verify the running test results. The experimental results show that the sources of the cabin noise and vibration basically comes from the irregularity of the railroad track and the deterioration of the connection part between cabin and bogie. Consequently for mitigation of noise and vibration of the electric train, the redesign of the center pivot with softer stiffness and the minimization of rail irregularity are necessary. the frequent maintenance of the train will lead to better comport.

Vibration sources and its countermeasures of high speed electric trains for subway (지하철용 고속전동차의 진동원 및 개선대책)

  • Park, Ki-Soo;Choi, Yeon-Sun
    • Proceedings of the KSR Conference
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    • pp.244-250
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    • 2007
  • The electric train in the first line subway runs faster in the block from Suwon to Cheonan than the general block. The faster run results in the deterioration of ride quality due to the increase of noise and vibration. To reduce the noise and vibration of the electric train, a running test of the electric train was performed in the block from Suwon to Cheonan. The experimental results show that the sources of the noise and vibration basically comes from the irregularity of the railroad track and the connection part between car body and bogie. The possible countermeasure of the high speed electric train can be the reinforcement of the center pivot to have more flexibility and the frequent maintenance of electric train.

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Study about varying aspects of flicker indices by load fluctuating in electric railway system (전기철도환경하에서 부하변동에 따른 플리커지수의 변화양상에 대한 연구)

  • Lee Kang-Won;Kim Myung-Yong;Baik Kwang-Sun;Kim Won-Kyung
    • Proceedings of the KSR Conference
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    • pp.655-659
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    • 2005
  • The environment. of electric railway has, included both fast and slow load variation, which may occur in the office or maintenance factory or running electric train. This paper investigated flicker indices according to voltage fluctuations on three different situations; The base office in new subway in the daytime and night time, inside of electric train running in conventional subway. And also the variations of harmonic frequencies(2nd, 3rd, 5th) with rime were measured at the same time. Flicker index is a good tool for evaluating the voltage fluctuation quantitatively and show some relationship with even harmonic frequencies produced by the voltage fluctuation when the electric train is running on the railway.

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A Study on Performance Evaluation of On-board Electric Device of TTX(Tilting Train Express) (틸팅열차(TTX)의 정장품 성능평가 연구)

  • Han, Seong-Ho;Lee, Su-Gil;Seo, Sung-Il
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.239-242
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    • 2005
  • This paper introduced an approach of improvement of performance of Electric device for EMU type Train like as TTX. The electric equipments are characterized by insulation, Noise, cooling system etc. and Their weight arc decided by these factors. There are two kinds of power source in EMU train. First, DC voltage source, 1500 volt, 750 volt is used for subway system. Second, AC power source 25000 volt is applied to high speed train and existing main lines. Composite material has the protection of inrush current and high frequency noise. We can use this material to minimize weight of train. Additionally we can get energy saving when operator service TTX.

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A Study on ground fault at low voltage line and apparatus in urban railway station (도시철도역사의 저압선로 및 기기에서의 지락사고 방지 방안에 관한 검토)

  • Min Kyung-Yun;Kim Jin-Ho;Han Hag-Su
    • Proceedings of the KSR Conference
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    • pp.699-704
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    • 2005
  • In the station of the railway and the subway various illumination equipment and a general power equipment for a passenger convenience, the signal equipment and the communication equipment which is necessary to the train operation provided. At the all of like this equipment from the electric room which is established in each station by changing from high voltage to low voltage and it supplies from the illumination transformer, the power transformer and the signal transformer. If it supplies to the equipment from the high voltage to the low voltage, it must be established to contact protection device in between the high voltage coil and the low voltage coil. Also it must do the grounding faulting device at the low voltage lines, the earthing devices at apparatus for the protection of an electric shock and an electric fire by the electric relation law. Compared the related regulations between the facilities which require protective functions such as grounding fault or earthing in public utilities like subway stations, and the facilities which do not require line earthing or protective functions such as electricity supplied for signalling the train. Also, will describe a countermeasure for the accident from a grounding fault.

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Measures for the safety of an electric car in case(Seoul metro) gives up the subway operation (도시철도(서울메트로) 영업운전을 포기할 경우 안전대책방안)

  • Jang, Young-Gil;Yi, Gye-Jean;Yoon, Sung-Woo
    • Proceedings of the KSR Conference
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    • pp.1852-1857
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    • 2007
  • Since the introduction of the subway, remarkable progress has been made so as to be able to produce a Korean standard electric car, but it is rather regretful that an engineer who is not aware of laws on a railroad or involved in a railroad designed a electric car. In the future, the electric cars with up-to-date technology must be introduced, but there are many difficulties in such introduction. For example, the operation of simultaneously moving and running scores of subway trains must comply with Regulation on Railroad Train Operation, so, close examination of these problems is required. The existing electric car, as does a motorcar, varies a little with makers in the type and characteristics. This paper is intended to discuss about the device and measures for reinforcing a function of Daewoo GEC electric car that was introduced by technical tie-up from England, which accounts for the most ratio in this field

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A research to decrease Formaldehyde on the train (전동차내 폼알데하이드 저감방안에 관한 연구)

  • Choi, Sung-Ho;Choi, Soon-Gi;Son, Young-Jin
    • Proceedings of the KSR Conference
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    • pp.1009-1013
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    • 2011
  • Seoul Metro Line 1 to 4 guests per day to 4.5 million people have been using the subway. This is close to the city population, 57 percent of people use the subway and found that 57 percent of people use the subway and found that this is close to the city population. Motor vehicle indoor air quality, especially of the major factors affecting is passenger's clothing, cosmetics, adhesives and formaldehyde by the action and so are able to keep. Enclosure 30ppm formaldehyde during prolonged exposure at concentrations above the nose, bronchial cough and a burning can cause symptoms. It is necessary to introduce an appropriate ventilation system. 1-4 Line Press in 2008, leaving the subway, and normally the train measured in room air quality. Measurements in 2005, $19.3{\sim}83{\mu}g/m^3$, 2008 Year ND ~ $61.7{\mu}g/m^3$ is. When congestion(rush hour) to temporarily increase the formaldehyde can result in a higher number. Automatic detection of formaldehyde and improve ventilation to a practical system, and it is necessary to chatneun. In research since 2006, Removal of formaldehyde were analyzed for the study. the passengers on the effects of formaldehyde in rush hour, the plan for increasing the ventilation through the analysis of various factors, such as electric vehicle practical ways to improve air quality have been studied.

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A Study on the Traction System and Electric Devices of Double Deck (Express) Trains (2층ㆍ급행열차 추진시스템 및 전기장치에 관한 연구)

  • 백광선;김형진;김명룡;장동욱;박광복
    • Journal of the Korean Society for Railway
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    • v.7 no.3
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    • pp.208-214
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    • 2004
  • In this paper, traction system and electric devices of a double deck train were designed to examine technical reasonableness for driving on the ground and underground. Double deck trains operated in other countries were also considered. For designing the electric devices, two types of accelerations and electric devices arrangements which are based on the current subway system were considered.

Measurement of 18GHz Radio Propagation Characteristics in Subway Tunnel for Train-Wayside Multimedia Transmission (지하철 터널에서의 18GHz 무선영상신호 전파특성 측정)

  • Choi, Kyu-Hyoung;Seo, Myung-Sik
    • Journal of the Korean Society for Railway
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    • v.15 no.4
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    • pp.364-369
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    • 2012
  • This paper presents an experimental study on the radio propagation characteristics in subway tunnel at 18GHz frequency band which has been assigned to video transmission between train and wayside. The radio propagation tests are carried out in the subway tunnel of Seoul Metro using the antenna and communication devices of the prototype video transmission system. The measurement results show that 18GHz radio propagation in subway tunnel has smaller path loss than that of general outdoor radio environment. It is also cleared that the arch-type tunnels have smaller radio propagation losses than rectangular tunnels, and single track tunnels have smaller pass loss than double track tunnels. From the measurements, the radio propagation coverage is worked out as 520 meters. The curved tunnels which cannot have LOS communication between transmitter and receiver have large pass losses and fluctuation profile along distance. The radio propagation coverage along curved tunnels is worked out as 300 meters. These investigation results can be used to design the 18GHz radio transmission system for subway tunnel by providing the optimized wayside transmitter locations and handover algorithm customized to the radio propagation characteristics in subway tunnels.

A Study en the reduction noise level of subway running train (전동차 주행시 소음저감 방안에 관한 연구)

  • So, Jin-Sub;Yu, Yang-Ha;Kim, Chi-Tae;Lee, Sang-Bae
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.979-981
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    • 2006
  • Recently as the well-being diffuse and the living standard improves. People's demand for an environment lifestyle is gradually on the rise. The major source of the subway running train is rolling noise generated by the surface condition of wheel and rail. In this study, we research trends on the reduction noise level. Further-more, special traffic Ubiquitous helps to environment technical development.

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