• Title, Summary, Keyword: 지하철 전동차

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A Study on Whole Body Vibration in Subway System (지하철 전동차에서의 전신진동 특성에 관한 연구)

  • 정상욱;이상훈;박상규
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.354-361
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    • 1997
  • 본 연구에서는 우선적으로 수도권 대량운송 수단인 지하철 전동차의 진동을 측정하고 인체에 미치는 영향을 평가하였으며 전동차의 진동특성이 인체 각 부위에 전달되는 형태를 분석.평가함으로써 승객과 승무원의 승차감 및 작업환경 향상은 물론 차후 개발되는 고속전철 및 비접지 차량(zero-ground pressure vehicle) 등의 개발에 필요한 기초자료를 제공하고자 한다.

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Analysis for Willingness to Pay of the Advanced Railway System (차세대전동차 시스템 도입에 따른 이용자 지불의사금액 결정요인분석)

  • Ha, Oh-Keun;Kim, Yong-Jin;Oh, Mi-Young;Park, Dong-Joo;Lee, Soo-Beom
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.9 no.4
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    • pp.113-122
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    • 2010
  • Research and development related to advanced railway systems is currently underway presently to promote the maintenance and economic feasibility of subways, and the aim of such research and development is to enhance the functionality, passenger convenience, system safety and reliability assurance of the subway. In this situation, a study that predicts the effect that the development of such an advanced railway system would have on subway users is required. To this end, this study derived willingness to pay and decision factors with the introduction of an advanced railway system after surveying passengers who use subway lines 1~8. The Price Sensitivity Method (PSM) was applied to derive the willingness to pay in relation to user convenience (operating speed, ride comfort, safety, comfort, security and informativeness) with the introduction of an advanced railway system. In addition, willingness to pay and decision factors were examined after explaining the effects of introducing an advanced railway system in detail to subway users. Through the analysis, it was found that willingness to pay amounted to a premium of 148 won ~ 161 won with the introduction of an advanced railway system, and that this was affected by factors such as gender, frequency of use, satisfaction with comfort, and satisfaction with security.

Lateral Damper of Subway Vehicle for Preventing Abnormal Impact (지하철 전동차 비정상 충격 방지를 위한 횡댐퍼에 관한 연구)

  • Shin, Yujeong;You, Wonhee;Park, Joonhyuk;Hur, Hyunmoo;Jeon, Juyun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.1
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    • pp.17-23
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    • 2013
  • In a subway vehicle, a lateral damper is used for compensating the lateral stiffness deterioration due to the air-spring as a secondary suspension. This lateral damper can reduce the lateral vibration of the carbody. When the damping force of the lateral damper is lowered, the running stability and ride quality of the subway vehicles worsens and the lateral motion of the carbody is increased. In this study, the lateral displacement variation of the carbody according to the damping force of the lateral damper was analyzed by multi-body dynamics to solve the abnormal impact problem during vehicle operation. Furthermore, the noise and vibration due to abnormal impact were considered. An adequate damping coefficient of the lateral damper for the subway vehicle treated in this paper was suggested for preventing abnormal impact.

A User's Location Localization Method using Smartphone Sensor on a Subway (지하철에서 스마트폰 센서를 이용한 사용자 위치 추적 방법)

  • Cho, Jung-Gil
    • Journal of the Korea Convergence Society
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    • v.11 no.3
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    • pp.37-43
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    • 2020
  • Smartphone-based localization has been widely studied in many different scenarios. But as far as we know, few work has addressed the problem of localization in underground public transportation systems, where GPS signal and wireless infrastructure are not always available. Knowing the location of a train is necessary to develop a useful service for subway passengers. And so, estimation of motion state and stop station by using sensors on a smartphone is being studied for subway passengers. This paper proposes a localization method that uses a barometer and a magnetic sensor on a smartphone. The method proposed in this paper first estimates whether the train runs or stops according to the change in air pressure and the strength of the magnetic field. The altitude value and the magnetic field value are then used to estimate the exact stop station of the train. We evaluated the proposed method using data from the Seoul's subway line 5. Compared with previous methods, the proposed method achieves higher accuracy.

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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Effects of the design parameters of the suspension system on the bounce of an electric railway car (현가장치 설계변수 변화에 따른 전동차 상하진동의 영향)

  • Park, Ki-Soo;Choi, Yeon-Sun
    • Proceedings of the KSR Conference
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    • pp.175-181
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    • 2007
  • 본 연구에서는 지하철용 전동차의 현가장치를 구성하는 1차 현가장치 및 2차 현가장치의 강성 및 감쇠지수 변화가 전동차의 상하진동에 미치는 영향을 분석하였다. 실제 운행 중인 전동차에 대하여 액슬박스, 대차, 객차에서 측정된 진동 데이터를 바탕으로 대차와 차체로 구성된 2자유도계 해석모델을 생성하였고, 실측된 윤축의 진동을 입력신호로 하여 수치해석을 수행하였다. 1, 2차 현가장치의 강성 및 감쇠지수의 변화에 따른 응답을 고찰한 결과, 차량의 상하진동에 지배적인 영향을 주는 설계변수는 2차 공기스프링의 강성임을 알았다. 또한 이러한 결과는 ADAMS/RAIL 전산해석을 통해서도 검증할 수 있었다.

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A Study on Estimation of Contribution for Noise of rail of Subway and Locomotive - Effect of building structure on vibration of subway by multi-dimensional spectral analysis - (지하철레일 및 전동차 소음에 대한 기여도 평가의 연구 - 다차원 스펙트럼 해석에 의한 지하철 진동의 건축구조물에 미치는 영향 -)

  • 오재응;강호정;차일환
    • The Journal of the Acoustical Society of Korea
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    • v.4 no.3
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    • pp.21-32
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    • 1985
  • 서로 상관관계가 있는 다입력원 진동계의 진동원을 규명하기 위한 방법을 제안하였다. 다차원 스펙트럼 해석을 이용함으로써 지하철 진동의 가장 중요한 진동원을 발견하였다. 이 분석은 진동의 전 달경로가 매우 복잡할 때 다입력-단일출력으로 모델화 하여 분석하는 방법이다. 또한 레지듀 스펙트럼 분석과 부분기여함수의 개념을 적용하여 지하철 진동이 콘크리트 구조물의 진동에 미치는 영향을 마이 크로 컴퓨터로 계산하였다. 이러한 연구의 결과로 지하철 진동의 다차원 스펙트럼의 오버올레벨을 측정 치와 비교하였다.

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DC railway regenerative inverter system with voltage drop compensator (전압강하 보상기능을 갖는 직류지하철 회생인버터 시스템)

  • Kim, Jun-Gu;Cho, Kee-Hyun;Kim, Jong-Yoon;Won, Chung-Yuen;Kim, Yong-Ki
    • Proceedings of the KIPE Conference
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    • pp.136-138
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    • 2007
  • 본 논문에서는 전압강하 보상 기능을 갖는 직류 지하철 회생 인버터 시스템을 제안하였다. 직류 지하철 시스템의 정류기 사고 및 급전선의 단선사고로 인해 계통으로부터 원활한 전력을 공급받지 못하는 경우 전동차가 운행할 수 없다. 이러한 문제점을 해결하기 위해 직류 지하철 시스템과 병렬로 연결되어진 회생인버터에 전압강하 보상 기능을 추가 하였다. 본 논문에서 제안하는 전력변환기는 양방향으로 전력 제어가 가능하여 하나의 전력변환기기로 3가지의 기능을 수행한다. 시뮬레이션과 실험을 통해서 제안된 시스템의 타당성을 확인한다.

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The Effect of Vibration of Subway on Earth & Structures in the Region of Subway (지하철 진동이 주변지반 및 인접구조물에 미치는 영향)

  • Kang, Ho Jung;Oh, Jae Eung;Chun, Byung Sik
    • Journal of The Korean Society of Civil Engineers
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    • v.7 no.2
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    • pp.1-8
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    • 1987
  • Recently, as subway traffic have been increased, vibration of each parts of subway influence on structures above subway tunnel. This paper presents a new method to reduce which was generated by subway traffic. By comparing directional coherence relationship of X, Y, Z-axis and vibrational coherence relationship of spherical signal which was unified by three directional signals, effective vibration diminishing method was proposed. It can be found that locomotive vibration(specially 1-2Hz) have the worst effect on the vibration of structures and the vibration of subway box ranked 2nd, the vibration of earth ranked 3rd.

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