• Title/Summary/Keyword: subway train

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A Study on the Development of the Train Wind Rate Prediction Program in Tunnel of the Subway (지하철 터널내 열차풍 예측 프로그램 개발에 관한 연구)

  • Kim, J.R.;Choi, K.H.
    • Journal of Power System Engineering
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    • v.3 no.1
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    • pp.38-44
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    • 1999
  • Subway is one of the most important transportation and its facilities are increased by the drift of population to cities in these days. But heat generation results from lighting, human and traffic increase in subway, half-closed space, gives uncomfortable sense to the subway passengers. Therefore, natural ventilation by piston effect is done to relieve uncomfortable sense. But train wind by piston effect gives uncomfortable sense to the subway passengers, too. So the numerical calculation of inflow and outflow amounts is important to predict thermal environment and reduce train wind. In case of actual survey of train wind in target station, the amount of train wind are about $3100m^3/train$ at the minimum, about $6000m^3/train$ at the maximum, about $4200m^3/train$ on average. When comparison between simulation for train wind prediction and actual survey for accuracy was done train wind prediction program showed similar results.

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A NUMERICAL ANALYSIS OF THE TRAIN WIND IN THE SUBWAY TUNNEL (지하철 터널 내 열차풍의 수치해석적 연구)

  • Lee, J.H.;Juraeva, M.;Song, D.J.
    • 한국전산유체공학회:학술대회논문집
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    • 2010.05a
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    • pp.496-500
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    • 2010
  • Understanding train-wind is the best method to know how to optimize subway ventilation system. The capacity and efficiency of the subway ventilation system are known by pressure and velocity while train runs. Analysis of the internal flow in subway tunnel and around subway station are studied using numerical methods. Characteristics of internal flow and influence of subway ventilation system for the subway station with platform screen door and tunnel are analyzed by unsteady state analysis. Velocity and pressure of train wind transformation are compared at around subway ventilation system and the internal flow is investigated at the subway tunnel.

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A Research Study for Wind Environment of Subway Station (지하철 정거장의 열차풍에 관한 조사연구)

  • Shin Tae-Gyun;Kim Young Duk
    • Proceedings of the KSR Conference
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    • 2005.05a
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    • pp.42-47
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    • 2005
  • When the train travels quickly, in the center of city subway tunnel the strong wind blows caused by its piston effect, and the train wind blows while train enter the subway station with this effect. The train wind brings unpleasantness which passenger's hair wavering and the skirts of passengers flapping severely, and critical situations to the old and the weak people. It considers seriously like this, the research is meant to find extent of subway train wind influence on the passengers from the part Seoul subway stations.

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Analysis on the Train-wind Pressure applied to Screen Door in Island-type Platform of Subway (지하철의 섬식 정거장에 설치된 스크린도어에 가해지는 열차풍압 해석)

  • Kim, Jung-Yup
    • 한국전산유체공학회:학술대회논문집
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    • 2008.03b
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    • pp.138-141
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    • 2008
  • The screen doors installed in the station of subway are subject to the train-wind pressure caused by the operation of trains. The train-wind pressure has to be correctly estimated for the design of safe structure of screen doors. As three-dimensional numerical flow analysis technology has been significantly developed, the analysis on the train-wind pressure with diverse variables such as train specifications, train speed, tunnel and station configurations, and blockage ratio can be effectively carried out with three-dimensional numerical method. In this study, computational analysis of train-induced wind in a subway tunnel employing the screen doors are carried out by using the three-dimensional numerical method with the model of the moving boundary for the run of trains. While the numerical analysis of train-wind pressure was applied on the one island-type station in the Seoul Subway Line 2, maximum pressure of 494 Pa was estimated on the screen door when two trains pass each other at the speed of 80km/h in the platform.

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A NUMERICAL ANALYSIS OF TRAIN-WIND IN THE SUBWAY TUNNEL FOR THE IMPROVEMENT OF THE OF UNDERGROUND SPACE AIR QUALITY (지하공간의 공기 질 개선을 위한 지하철 터널 내 열차풍의 수치 해석적 연구)

  • Lee, J.H.;Juraeva, M.;Jeong, S.H.;Song, D.J.
    • 한국전산유체공학회:학술대회논문집
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    • 2011.05a
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    • pp.523-528
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    • 2011
  • Subway becomes more and more main transportation in major cities. Air pollution in the subway platforms is decreased; however, dust flow inside subway tunnel and train is increased by installing Platform Screen Door. Airflow inside subway tunnel is observed using computational method in this study The airflow characteristics around ventilation shafts and inside the tunnel is studied following the train movement, while the train moves from existing Miasamgeori station to Gireum station ANSYS CFX V12.0.l and ICEM CFD V12.0.l are used to compute the airflow inside the subway tunnel.

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A Study on the Application of LED Light Source in Subway Train (도시철도차량에 LED 광원의 적용에 관한 연구)

  • Choi, Sung-Kuk;Park, Dae-Won;Kil, Gyung-Suk;Park, Hee-Chul;Jo, Eun-Je
    • Proceedings of the KSR Conference
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    • 2009.05a
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    • pp.2050-2055
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    • 2009
  • This paper describes the proceeding experimental results to replace the 32 [W] fluorescent lamp installed in subway train to a LED module. We fabricated 25 [W] LED modules to meet the illuminance 300 [lx] specified in the standard for subway train. After the installation of LED modules, comparative analysis with conventional fluorescent lamps was carried out. From the experimental results, illuminances on the height of 0.85 [m] and 1 [m] above floor were 323 [lx] and 360 [lx], respectively. These illuminances satisfied the requirement 300 [lx]. By the application of 25 [W] LED module as a light source in subway train, energy saving about 22 [%] compared with 32 [W] fluorescent is acquired. Also, low cost of maintenance is expected due to 8 times longer lifetime 50,000 hours of LED than that 6,000 hours of fluorescent lamp.

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Estimation of Train-Induced Wind Generated by Train Operation in Subway Tunnels (지하철 터널내 운행열차에 의한 열차풍의 산정)

  • 김신도;송지한;이희관
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.16 no.7
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    • pp.652-657
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    • 2004
  • Development of underground space in urban area has a huge amount of potential to ease the limitations on the land use and the efficiency especially in urban area. Considering public transportation in urban area, subway system could be one of the most efficient and practical approaches. Subsequently this leads the public to have more chances to experience the indoor air quality (IAQ) in subway systems. In this study, it was aimed to produce useful data for the IAQ control in subway environments, Specifically the train-induced wind has been investigated by means of field survey and analysis. The recent updates including the quantified characteristics of train-induced wind are presented in this paper.

Identification of Noise Characteristics for Subway Train Passing through the Underground Tunnel (터널통과 전동차 내외부 소음 특성 규명)

  • Cho, Jun-Ho;Lee, Kyu-Jin;Jung, Woo-Sung;Hong, Chull-Kee
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11b
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    • pp.340-345
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    • 2002
  • Passengers in automobile or train are exposed to a worse noise environment when they are in the tunnel than in the open field. This is due to a relatively higher space density of sound energy by multiple reflection phenomenon of noise generated by operation of transportation vehicles from tunnel wall compared to open field. In this study, noise characteristics of subway train running through a tunnel were investigated at straight/curved track and tunnel type(semi circular/box). Also the noise measured simultaneously at inner and outer sides of train running through a tunnel, so that the coherence of the various noise sources of subway train to inner noise was evaluated.

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An Experimental Study on the Characteristics of Train-Wind in Underground Shopping Center Connected to Subway Station (지하도 상가와 지하 역사 연계구에서 열차풍 발생 특성에 관한 실험적 연구)

  • Hwang, In-Ju;Lee, Hong-Cheol
    • Proceedings of the SAREK Conference
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    • 2005.11a
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    • pp.82-87
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    • 2005
  • The characteristics of train-wind in the underground shopping center(UGSC) connected to subway station is investigated by field measurement for the case of train movement such as arrival and departure, etc. Also air curtain installed at the pass way between underground shopping center and subway station were considered as the parameter in order to analysis the effect on indoor air quality and thermal condition. The measurement data such as velocity, relative humidity, wind-pressure were plotted as quantity variation with time scale. The train-wind affected wind velocity, air pressure and relative humidity at the connecting area of underground shopping center and subway station, and the variation was about 4.5 m/s, 8%, 40 Pa. Also the result showed that the air curtain is not proper to reduce influence of train-wind

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Train Wind Analysis of Subway Platforms (지하철 승강장 열차풍 특성 분석)

  • Bae, Sung-Joon;Hwang, Sun-Ho;Shin, Chang-Hun;Kim, Shin-Do;Lee, Kyoung-Bin;Park, Duck-Shin
    • Proceedings of the KSR Conference
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    • 2011.10a
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    • pp.100-106
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    • 2011
  • PSD(platform screen door) was completely installed at all of Seoul subway station(line 1~8) using 640million people per day by 2010. After installation of PSD, the influence of train induced wind at platform decreased, but is estimated to increase in subway tunnel. In this paper, train induced wind occurred by pass of subway at platform was measured and analyzed using numerical analysis by computational fluid dynamics.

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