• 제목, 요약, 키워드: Railway vehicle

검색결과 1,518건 처리시간 0.052초

주행 중 철도 차량의 결함 위치 추정 방법 (Fault localization method of a train in cruise)

  • 전종훈;김양한
    • 한국철도학회:학술대회논문집
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    • pp.903-912
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    • 2007
  • Faults of rotating parts of a train normally generate unexpected frequency band or impulsive sound[1] which has a period when it moves with a constant speed. The former can be detected by the moving frame acoustic holography method, which visualizes sound field that is generated by a moving and emitting pure tone or band limited noise source. We have attempted to apply the method to the latter case: the periodic impulsive sound which generate different signal compared with what can be measured by the band limited noise. The signal to noise ratio which determines the success of early fault detection must also be studied with the impulsive and moving signal. This research shows how the problems related with these issues can be resolved. The main idea is that periodic impulsive signal can be expressed by infinite set of discrete pure tones. This enables us to obtain lots of holograms that visualize periodic impulsive sound field including noise by using the moving frame acoustic holography method. Therefore holograms can be averaged to improve the signal to noise ratio until having reliable information that exhibits where the impulsive sources are. Theory and experiment by using the miniature vehicle are described [Work supported by BK21 & KRRI].

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장대 레일의 온도 좌굴 해석 (Thermal Buckling Analysis of Continuous Welded Rail Track)

  • 신정렬;임남형;양재성;강영종
    • 한국전산구조공학회:학술대회논문집
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    • pp.433-440
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    • 1998
  • For many decades, railroad technology was used to set up tracks with jointed rails and lengths in accordance with rolling and handling technology. The joints lead to drawbacks in the track and in controlling rising maintenance costs. So, railroad engineers became interested in eliminating joints to increase loads, speeds and improvements in rolling, welding, and fastening technology. Continuous welded rail(CWR) track has many advantages over the conventional jointed-rail track. In the case of the elimination of rail joints, it may cause the track to be suddenly and laterally buckled by thermal forces and vehicle load. Thermal forces are caused by an increase in the temperature of railway track. For many years, many analytical and experimental investigations have been conducted to improve the safety of CWR track by various research center in many country. In this paper, CWR track model and CWRB program is developed for buckling analysis using finite element method(FEM). The finite element discretization is used for a rail element with a total of 14 degrees of freedom. The stiffness of the fasteners, tie, and ballast bed is included by a set of spring elements. The investigation on the buckling modes and temperature of CWR track is presented in this paper

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철도레일 방진 체결장치의 진동 및 소음 저감 효과에 관한 실험적 연구 (Experimental Study of Vibration and Noise Reduction Effect of Railroad Vibration Isolator)

  • 이장현;김태언;이성춘;전익범
    • 한국소음진동공학회:학술대회논문집
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    • pp.1373-1378
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    • 2000
  • Vibration caused by railroad vehicle including subway train running raises a lot of problems to the neighboring buildings. Therefore lots of methods to isolate the railway vibration have been studied and practically applied to sites. As one of them, specially designed vibration isolation device was installed in the some section of Seoul subway. This device is installed between the rail and track slab. Because the process of installation is relatively simple, this method can be applied to the existing railways in servicing. We measured the vibration and noise to check the effectiveness of this device before and after the installation. The result showed that the vibration level of the slab and platform was reduced to 7 - 10 dB. Expecially high frequency component was reduced to a large amount. From this result, we can conclude that these kind of devices are useful to the reduction of the railroad vibration, expecially the high frequency vibration which can cause structure born noise.

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기본설계 단계에서 분산형 고속철도차량의 현가요소 최적화 (Optimization of the Suspension Characteristics for a High Speed Electrical Multiple Train on the Stage of Basic Design)

  • 박찬경;목진용;김기환
    • 한국철도학회:학술대회논문집
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    • pp.183-188
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    • 2009
  • The High speed electrical multiple train having a distributed electrical motor system has just been developing to aim the experimental maximum speed at 400km/h since August, 2007. This project comes in stage of basic design and so, it needs to take some review and analysis the characteristics of suspensions on the view of basic design. The vehicle model for dynamic analysis is made from the concept design model that used for the preliminary design review with Vampire program and it is modeled with three linear secondary dampers and two shear springs separated from the bush elements in previous model. The optimization technique is applied to search the proper range of linear characteristics for the suspension elements to satisfy the stability performance at speed 130m/s (about 460km/h). The results shows there are some optimum points according to the variation of primary and secondary suspension characteristics and it would be useful to make a decision to select the proper suspension elements in the precision design that will be done by the manufacturing company.

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도시철도 운전에너지 효율화를 위한 조사 분석 연구 (Investigation, analysis and study for urban transit's driving energy efficiency)

  • 김영규;박세영;박영석;정일봉;한문섭
    • 한국철도학회:학술대회논문집
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    • pp.612-618
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    • 2009
  • Recently the roles of railways about the prevention of global warming caused by greenhouse gases and for low carbon green growth are larger than ever. And the railroad-related research institutions have been active in researching for energy conservation. Especially the urban railroad has been emerged as the best means of transportation compared to the general public transportation systems in punctuality, stability, ecology and etc. In operating the urban railroad system there are various ways for energy savings. In the larger category, One is the hardware aspect according to the structure of the vehicle and the development of control systems. The other is the software aspect which efficient train operation can be made through control of driving patterns and driving diagram. In this paper, there is sense to analyze the result in verifying expectation relation with variable and the use of electric power on this after selecting main variables that can influence to the energy of the train operation in the software aspect. First, after collecting the basic data related to operation(train speed, operating hours, power consumption, the position of stopping station, electrical power system etc.) and according to this, investigating the consumption of the energy of the operation, in the side of energy consumption deducing and analyzing problem, this will be found solutions.

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Preliminary Study of Energy and GHG Footprint of CFRP Recycling Method using Korea Database

  • 프티차이위본피라다;이철규;김용기
    • 한국철도학회:학술대회논문집
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    • pp.247-250
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    • 2009
  • Awareness of resource conservation and pollution prevention has been continually increasing. The proven benefits from CFRP's unique combination of light weight and high strength compare to conventional material is well suited for minimizing fuel consumption during vehicle in particular rail operation. Responding the awareness, this work intends to study CFRP's recycling method that is not only technical performance but also environmental view point. According to prior work of technical performance test, this work aims at quantifying the footprint of energy and GHG derived from the two appreciated performance of pyrolysis and acids recycling methods. The streamline LCA is the concept for systematic assessment. The boundary is scoped at the recycling activity, consequently, the data in and out from the specific target activity are obtained under the gate to gate data collection. Its function is recovery carbon fiber. To count and compare function, functional unit is set at 60% of recycling rate. Korea database is mainly source for acquiring the footprint of both. The numerical results presented that the energy footprint of acids and pyrolysis is 164.95 and 1,199.88 MJ-eq., respectively. Meantime, the GHG footprint of is 1,196.22 and 5,916.08 g CO2 eq. for acids and pyrolysis. In summary, the acids recycling method is, in regarding the environmental performance, better than pyrolysis recycling method.

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위험물 수송 탱크 차량의 국내외 안전기준 비교 연구-유류 차량 중심 (A Study for the Safety Regulation of Tank Car for the Hazardous Material - General Oil Tank Car)

  • 김재훈;구병춘
    • 한국화재소방학회논문지
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    • v.22 no.4
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    • pp.70-75
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    • 2008
  • 최근 들어 철도차량 안전과 관련하여 국내에서 다양한 연구가 진행되고 있다. 하지만 대부분의 연구는 여객을 수송하는 일반 객차, 전동차, 고속열차 등을 중심으로 행해지고 있으며, 화물 특히 위험물 수송 화물차량에 대한 연구는 전무한 실정이다. 본 연구에서는 위험물질을 수송하는 탱크차의 안전기준을 개발하기 위하여 유류를 중심으로 국내외 관련된 안전기준을 비교 분석하여 국내 위험물 수송 탱크차 안전기준 개발의 기초를 마련하고자 한다.

전기철도 전원계통에서의 화재 사고사례 분석 (Analysis of Fire Accidents on Power Line for DC Electric Traction Vehicles)

  • 송재용;조영진;김진표;박남규;길경석
    • 한국철도학회:학술대회논문집
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    • pp.241-247
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    • 2008
  • This paper describes a cause of fire accidents on power system for DC electric traction vehicles. We investigated fire scene of power line for DC electric traction vehicles. From analysis results, the cause of fire on power line turned out line to ground fault between a feeder of electric power services(pantagraph) and DC electric traction vehicle roof. Fire accidents of DC electric traction vehicles be assumed that electric sparks had been produced between the pantagraph and the power line conductor by repetitively making contact and separation, maybe if some material like branches get in between connecting rod it make progress line to ground fault. ZnO arresters are widely used to protect DC electric traction vehicles against overvoltages caused by lightning or switching surges. However, the arresters are deteriorated by commercial frequency overvoltages and/or lightning one. Deteriorated arresters could lead power failures, such as line to ground fault by a thermal runaway resulting from the increases in leakage current even in a nominal power system voltage. The power failures, such as line to ground fault would be causative of the fire accidents.

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철도교량 자동화 로봇 개발을 위한 기초 연구 (A Study for Developing of Rail Bridge Inspection Robot)

  • 구자경;황인호;이종세;이태식
    • 한국철도학회:학술대회논문집
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    • pp.188-193
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    • 2008
  • According to introduce KTX in Korea, rail-road bridge section of KTX was increased approximately 50% of the total length. Bridge is required periodic inspection and check to prevent accident and hazard because various damage which have effects on traffic and replacement of damaged parts is difficult. Specifically, the train as large-scale transportation because accidents led to great damage, preventing these accidents are critical. Well-organized management and maintenance systems are required to prevent the accidents. In the case of roadway bridge, bridge inspection vehicle is used to deploy inspectors in roadway bridge. However, this method requires a lot of time and efforts, and inspectors are exposed to potential hazard. Also, surrounding environment like poor lighting system or electric wire could harm the inspector while repairing. Due to this reason, automatic repairing and inspecting system have been introduced to replace the old methods. Management system of the railroad bridge track for trains uses various advanced equipments, but whereas roadway bridge management system is lacking these efforts. As a result of that, this study looks over the existing management method. and review the method to apply the Bridge Inspection Robot in railroad bridge. Moreover, this study suggests future management technology using inspection robot.

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제동디스크 소재의 내열성 비교시험방법 연구 (A study of comparative experiment process for heat resistance of brake disk materials)

  • 임충환;구병춘
    • 한국철도학회:학술대회논문집
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    • pp.941-947
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    • 2008
  • 철도차량의 제동에는 전기의 회생, 발전을 이용하는 전기적 제동장치와 함께 차륜 답면 및 디스크를 사용하는 기계식 제동장치가 적용된다. 특히 브레이크 디스크의 제동작용에 있어서, 디스크와 마찰패드와의 마찰을 통해 차량의 운동에너지가 열에너지로 변환되며 이때 디스크 표면에는 매우 높은 온도가 집중하게 된다. 이러한 고온 집중의 반복에 의해 디스크 표면에는 열피로에 기인한 열균열이 발생하게 된다. 발생된 열균열은 차량 유지보수성능을 저하시키고 최악의 경우 대규모의 사고를 유발할 수도 있다. 본 연구에서는 보다 높은 내열성을 갖는 브레이크 디스크 소재를 개발하기 위한 과정의 일환으로 재료의 내열성 비교시험절차를 구축하였다. 또한 현재 새마을호 및 무궁화호 열차에서 사용되는 브레이크 디스크 재질을 이용한 시험을 통해 시험 절차의 효용성을 확인하였다.

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