• 제목/요약/키워드: contact wire

검색결과 327건 처리시간 0.032초

와이어 충돌감쇠를 갖는 다공성 박판의 비선형 진동 해석 (Nonlinear Vibration Analysis of Thin Perforated Plate with Wire Impact Damping)

  • 김성대;김원진;이부윤;이종원
    • 한국소음진동공학회논문집
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    • 제12권8호
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    • pp.639-647
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    • 2002
  • The nonlinear vibration of the thin perforated plate is analyzed in consideration of the V-shaped tension distribution and the effect of wire impact damping. The reduced order FEM model of the tension plate is obtained from dynamic condensation for the mass and stiffness matrices. Tension wire is modeled using the lumped parameter method to effectively describe its contact interactions with the plate. The nonlinear contact-impact model is composed of spring and damper elements, of which parameters are determined from the Hertzian contact theory and the restitution coefficient, respectively. From the evaluation of the computational accuracy and computation time for the deduced impact stiffness and damping coefficient, we determined proper values for the simulation works, accounting for the computational accuracy as well as the computational efficiency. Finally we discussed the results of nonlinear nitration analysis for variations of their design parameters.

고속 카메라를 이용한 전차선 형상 검측 시스템 구현 (Implementation of Image Monitoring system using High Speed Camera for Overhead Contact Wire)

  • 조용현;권삼영;이기원;박현준;나해경;고병훈;박영
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2006년도 추계학술대회 논문집
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    • pp.1483-1487
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    • 2006
  • In electric railway, image monitoring using high speed camera provides reliable, timely information of wear and geometry status, important in taking decisions for overhead contact wire maintenance. The contribution of this research is the development of a simple real-time monitoring system for use in measurement subsystem of contact wire and geometry of overhead contact wire in electric railway. The system has been consists of a high speed CMOS camera with resolution $1024{\times}1280$ pixels, line type laser source and PC-based image acquisition system with PCI Express slot. Vision acquisition software have been used in application programming interface for image acquisition, display, and storage with a frequency of sampling of 500 acquisitions per second.

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수동필터를 이용한 고속전철 이선현상에 의한 전원외란 저감 (Reduction of Power Disturbance by Contact Loss Phenomenon of a High Speed Electric Train Using Passive Filters)

  • 장진영;진강환;강정남;박동규;김윤호
    • 전기학회논문지P
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    • 제59권2호
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    • pp.206-211
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    • 2010
  • Since high-speed train is a dynamic load in which electric power is externally supplied, contact loss between the catenary and pantograph occurs. This phenomena including vibrations generates frequently irregular arcs, which, in turn causes EMI. Thus it is very important to develop the approach to reduce arc phenomenon by contact loss, as speed of electric railway vehicle increases. In case of an electric railway vehicle using electrical power, compared with diesel rolling stock, Power Line Disturbance(PLD) such as harmonics, transient voltage and current, Electromagnetic Interference(EMI), and dummy signal injection etc usually occur. In this study, the dynamic characteristics of a contact wire and a pantograph suppling electrical power to high-speed train are investigated with an electrical response point. To implement power line disturbance induced by contact loss phenomenon for high speed train operation, a hardware simulator which considers contact loss between contact wire and pantograph as well as contact wire deviation is developed. It is confirmed by the experiments that contact loss effect is largely dependent on voltage conditions when the contact loss occurs. Also, a passive filter is designed to reduce power disturbance and the designed system is verified by experiment.

팬터그래프-전차선로 접촉부 영상처리 기술 개발 (Development of Image Processing Technology for Interaction between Pantograph and Overhead Contact Wire)

  • 김형준;박영;조용현;조철진;김인철
    • 한국전기전자재료학회논문지
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    • 제22권12호
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    • pp.1084-1088
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    • 2009
  • The measurement of dynamic stagger in electric railways is one of the key test parameters to increase speed and maintain safety in electric railways. This paper is introduces a non-contact optical-based measuring instrument of a catenary system in electric railways. The instrument is implemented by utilizing a CCD (Charge Coupled Device) camera installed on the roof of a vehicle for vision acquisition and image processing techniques including the Canny edge detector and the Hough transform to detect contact wires and calculate dynamic stagger. To check the validity of our approach for the intended application, we measured stagger of a overhead wire of a Korea Tilting Train (TTX). The non-contact optical-based measurement system proposed in this paper performs real-time stagger measurement of an activated high-voltage contact wire. By results of this paper, the instrument should be applied to assess performance and reliability of newly developed electric railway vehicles.

전차선의 집전상태 판단 알고리즘 구현 (On the Implementation of an Advanced Judgement Algorithm for Contact Loss of Catenary System)

  • 박영;정호성;윤일권;김원하
    • 전기학회논문지
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    • 제63권6호
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    • pp.850-854
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    • 2014
  • Analyzing dynamic performance between pantograph and contact wire depends on mechanical and electrical conditions such as contact force, currents, aerodynamics of pantograph and tension of overhead contact wire. For the characteristic of dynamic performance between pantograph and overhead contact wire, various evaluation systems are used to measuring of the interaction of the contact line and the pantograph. Among the various methods, the contact force and percentage of arcing are intended to prove the safety and the quality of the current collection system on the train. However, these methods are only capable of measuring on the train which are installed measurement systems. Therefore in this paper, a track-side monitoring system was implemented to measure electrical characteristics from active overhead contact wire systems in order to constantly estimate current collection performance of railway operation. In addition, a method to analyze loss of contact phenomena was proposed. According to simulation results, the proposed system was capable of measuring abnormal electrical behavior of pantograph and contact wires on the track-side. The advantage of the proposed system is possible to detect loss of contact or any other electrical abnormalities of all types of trains within sections from sub to sub without the need to install any on-board equipment on trains.

전차선-팬터그래프 사이의 이선현상에 따른 전원외란이 보조전원장치에 미치는 영향 (Effect of power line disturbance on loss of contact between contact wire and pantograph)

  • 김재문;김양수;장진영;김윤명
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2008년도 춘계학술대회 논문집 전기설비전문위원
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    • pp.179-181
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    • 2008
  • In this study, the dynamic characteristic of a contact wire and pantograph suppling electrical power to high-speed trains are investigated. The analysis of the loss of contact based on Power Simulator program software is performed to develop power line disturbance model suitable for high speed operation. It is confirmed that a contact wire and pantograph model are necessary for studying the dynamic behavior of the pantograph system.

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GMA용접에서 용접와이어와 콘택트팁의 재질이 마모에 미치는 영향 (Effect of Welding wires on the Contact tip Wear during GMA Welding)

  • 김남훈;고진현;황용화
    • 한국산학기술학회:학술대회논문집
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    • 한국산학기술학회 2011년도 춘계학술논문집 2부
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    • pp.683-686
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    • 2011
  • The effect of welding material such as welding wires and materials for contact tip on the contact tip wear was investigated. Two types welding wires such as solid and flux cored wire and a variety of contact tips made of Cu-P, Cu-Cr(0.25%), Cu-Cr(1%) and Cu-Cr-Zr were employed for the comparison of wear resistance. It was found that the wear resistance of contact tips materials was Cu-Cr-Zr, Cu-Cr(1%), Cu-Cr(0.25%), Cu-P in order while the solid wire had a better wear resistance than flux cored wire.

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가스메탈아크용접에서 콘택트팁의 마모에 미치는 용접재료의 영향 (Effect of wear of Contact Tips to Welding Consumable for Gas Metal Arc Welding)

  • 김인규
    • 한국생산제조학회지
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    • 제21권6호
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    • pp.860-864
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    • 2012
  • The contact tip is higher the wear of resistance and the longer life are demanded to GMA welding process. In this study, four different contact tips with three different compositions by two wires were evaluated their wear resistance by measuring in every one hour the area of enlarged hole at the exit side during actual wleding. Experimental results clearly showed that the Cr-containing tips strengthened by precipitation hardening have much better resistance to wear than those made by work hardening. In addition, flux cored wire is excellent abrasion resistance test results showed. Based on these results, the domestic industry, the life of the contact tip to know will be used as basic data.

팬터그래프-전차선간 아크 검측 장치의 신뢰성 분석 (Reliability Analysis of Arcing Measurement System Between Pantograph and Contact Wire)

  • 박영;권삼영;김재문
    • 전기학회논문지
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    • 제61권8호
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    • pp.1216-1220
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    • 2012
  • The current collection between pantograph and contact wire is a more critical component for need to train speed up in electric railway. The basic purpose of this paper is to establish a measure of determining arc by developing an arc detector assessment system. The system was designed under conditions of EN 50317 and simulations were conducted using the developed device. According to the results, it was possible to conduct certification tests following regulations of international standards. To check the validity of our approach for the intended application, we analysis contact loss of catenary system using developed arcing measurement system in Korea. The proposed arcing measurement system is expected to enhance precision of current collection quality performance assessment methods at high-speed lines and conventional lines.

저압용 누전차단기 접속부의 발열 및 금속 조직 분석에 관한 연구 (A Study on the Analysis of Heat and Metallurgical Structure of Connection Parts for Residual Current Protective Devices)

  • 최충석;송길목;김동욱;김동우;김영석
    • 한국화재소방학회논문지
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    • 제18권4호
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    • pp.57-63
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    • 2004
  • 본 연구에서는 저압용 누전차단기 접속단자에서의 접촉압력에 따른 발열특성을 조사하고 차단기 단자와 전선에 접촉 불량이 발생했을 때의 전압, 전류파형과 산화물 증식 등을 분석하였다. 차단기 단자와 전선에 접촉압력이 가해지지 않았을 때는 접촉저항증가로 열이 발생하고 금속표면에 산화 막이 형성되었다. 이때 단자 외부 절연물의 온도는 접촉 불량에 의해 급격하게 상승하며 단자내부에서 미세한 불꽃과 연속적인 방전음이 발생하였다. 단자내부도체와 접속전선 접촉면에서 기계적 진동에 의한 접촉 불량이 발생했을 때, 접촉면에서 산화물이 증식되고 발열온도는 869℃이상으로 상승하여 전기재해의 위험이 높음을 알 수 있었다.