• 제목, 요약, 키워드: Rail Stability

검색결과 218건 처리시간 0.192초

장대교량 신축부에서 침목간격 확대가 차량의 주행안전성 및 궤도의 구조안정성에 미치는 영향 (Effects of Expansion of Sleeper Span at the Deck End of a Long Continuous Bridge on Train Safety and Track Stability)

  • 양신추
    • 한국소음진동공학회논문집
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    • v.25 no.9
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    • pp.620-627
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    • 2015
  • Long continuous bridge deck can become contracted considerably as temperature drops, which can lead to a large expansion of sleeper span at the end of it. Since this huge sleeper span then can cause problems both with safety of train operation and structural stability of tracks, it is necessary to take the issue into consideration systematically in the designing process of the bridge. In this paper, an evaluation process through the analysis of train-track interaction was presented which can basically review the effects of the expansion of sleeper span at the end of long continuous bridge deck on the safety of the train and the structural stability of the track. The analyses of the interaction between the light rail train and tracks were carried out targeting the sleeper span as a main parameter. The safety of train operation and structural stability of tracks in a light rail system due to the expansion of the sleeper span were evaluated by comparing the numerical results with the related criteria.

QFT를 이용한 디젤엔진의 커먼레일 압력 제어알고리즘 설계 연구 (Common Rail Pressure Control Algorithm for Passenger Car Diesel Engines Using Quantitative Feedback Theory)

  • 신재욱;홍승우;박인석;선우명호
    • 대한기계학회논문집B
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    • v.38 no.2
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    • pp.107-114
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    • 2014
  • 이 연구에서는 Quantitative Feedback Theory(QFT) 기법을 이용한 승용디젤엔진의 커먼레일 압력제어 알고리즘을 제안하였다. 커먼레일 압력모델의 입력과 출력은 각각 Pressure Control Valve(PCV) 구동전류와 커먼레일 압력으로 정의하였고, Metering Unit(MeUn)이 커먼레일 압력에 미치는 영향은 모델 파라미터 불확실성으로 정의하였다. QFT 기법은 이러한 모델의 불확실성에 대하여 강건하면서도 정량적 요구사항을 만족할 수 있는 제어알고리즘 설계방법을 제시한다. 제안된 커먼레일 압력제어기는 목표 레일압력 추종성능과 안정성능이 확보되었으며, 인젝터에 의한 연료분사가 커먼레일 압력에 미치는 영향을 줄이기 위하여 외란제거성능(Disturbance Rejection)이 고려되었다. 설계된 제어 알고리즘은 엔진 동력계 실험을 통하여 검증하였으며, MeUn 구동전류와 연료분사량의 급격한 변화에 따른 제어알고리즘의 강건성과 외란제거성능을 검증하였다.

상전도 흡입식 자기부상열차에서 공극처리방식에 대한연구 (A study on gap treatment in EMS type Maglev)

  • 성호경;조정민;이종무;김동성
    • 한국철도학회:학술대회논문집
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    • pp.189-197
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    • 2006
  • Maglev using EMS becomes unstable by unexpected big air-gap disturbance. The main causes of the unexpected air-gap disturbance are step-wise rail joint and large distance between rail splices. For the stable operation of the Maglev, the conventional system uses the threshold method, which selects one gap sensor among two gap sensors installed on the magnet to read the gap between magnet and guide rail. But the threshold method with a wide bandwidth makes the discontinuous air-gap signal at the rail joints because of the offset in air gap sensors and/or the step-wise rail joins. Further more, in the case of the one with a narrow bend-width, it makes Maglev system unstable because of frequent alternation. In this paper, a new method using fuzzy rule to reduce air-gap disturbances proposed to improve the stability of Maglev system. It treats the air-gap signal from dual gap sensors effectively to make continuous signal without air gap disturbance. Simulation and experiment results proved that the proposed scheme was effective to reduce air-gap disturbance from dual gap sensors in rail joints.

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철도레일 복합 압전패드의 구성 차이에 따른 전압 발생 특성 분석 (Analysis of Voltage Generating Characteristics of Composite Rail Pad Composed of Piezoelectric PVDF Film and Polyurethane Bonding Materials)

  • 조호진;임유진;김성수;이종관
    • 한국전기전자재료학회논문지
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    • v.30 no.6
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    • pp.381-386
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    • 2017
  • A railway track generates severe levels of vibrations. In order to reduce these vibrations and to provide structural stability, various rail pads, mats, etc., are used for vibration protection. In this study, a specially designed rail pad was developed to reduce vibration and to generate electric power simultaneously, that is, by using the vibrations generated by railway cars on the track. The newly developed rail pads were tested to evaluate the characteristics of electric power by investigating the generated voltage and the current levels and patterns. In addition, we proposed an optimal laminated structure and adhesive by comparing the voltage generated by each type of adhesive required for optimal adhesion of the rail pad and the piezoelectric device.

승용 CR 연료분사시스템에 대한 유압 Modal 분석 (Hydraulic Modal Analysis of High-Pressure Common-rail Fuel Injection System for Passenger Vehicle)

  • 성기수;김상명;김진수;이진욱
    • 한국분무공학회지
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    • v.20 no.1
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    • pp.14-19
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    • 2015
  • Recently, R&D demand for environmental friendly vehicle has rapidly increased due to its global environmental issues such as global warming, energy and economic crisis. Under this situation, the most realistic alternative way for environmental friendly vehicle is a clean diesel vehicle. The common-rail fuel injection system, as key technology of clean diesel vehicle, consists of a high pressure pump, common-rail, high pressure fuel line and electronic control injector. In common-rail high-pressure fuel injection system, high pressure wave of injection system and geometry of injector elements have a major effects on high-pressure fuel spray. Therefore, in this study, the numerical model was developed for analysis about the common-rail fuel pressure pulsation by using AMESim code. We could secure stability of common-rail high-pressure fuel injection system through optimal design of fuel line.

장대레일화 된 교량의 축력거동특성 연구 (A Study on the Characteristics of Axial Force in Bridge with Continuous Welded Rail)

  • 김두환;한광섭
    • 한국구조물진단유지관리공학회 논문집
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    • v.7 no.1
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    • pp.251-258
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    • 2003
  • This study is to understand the characteristics of axial force behavior that operates to the part of continuous welded rail and to investigate the basic data for secure the structure's stability and retrofit of the track. To develop the FEM model that type of plate girder which is used in the domestic national railway among servicing railway type. It is to analyze the characteristics of axial force behavior according to equip of the expansion joint and support placing by using the axial force simulation in making the continuous welded rail. As the result of research on the parametric valuables through the analysis, it is investigated that 'FMFM type' is more efficient than the other support type. Also, it conclude that structures are having the expansion joint is the most safe condition.

악천후에 대한 고무차륜 AGT 경량전철의 안전 운행속도 (Speed Limitations of the Rubber-Tired AGT Light Rail Vehicle for Inclement Weather)

  • 김연수;박성혁;백남욱
    • 한국정밀공학회:학술대회논문집
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    • pp.1533-1536
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    • 2003
  • Dynamic model of the rubber-tired AGT light rail vehicle. various load and boundary conditions between vehicle and infrastructures(running track. guidance rail) were defined to analyze vehicular dynamic behaviors occurred by inclement weather(strong wind and earthquake). The dynamic analysis were performed by using a commercialized software RecurDyn. whose results for the magnitudes of wind and earthquake showed the resultant forces and accelerations between car body and bogie, or bogie guidance frame and infrastructures in the various track conditions(straight or curved tracks) and train velocities. Based on these results, speed limitation of tile vehicle were proposed to ensure system stability and passengers safety.

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철도노반 보수용 토목섬유 콘테이너의 정적 거동특성 분석 (Static Behavior of Geotextile Container for Urgent Restoration of Rail Roadbed)

  • 신은철;고태훈;조인휘;이준철
    • 한국철도학회:학술대회논문집
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    • pp.79-84
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    • 2003
  • Utilizing of the geotextile container shows several advantages such as standardized construction, factory manufactured products, the control of quality, workability, and economical point of view. Recently this technique can be applied to rehabilitate the loss of rail roadbed due to the heavy rainfall. In this study, a large-scale laboratory test were conducted with simulation of static performance on the geotextile container reinforced rail roadbed. Based on the laboratory test results, the vertical pressure distribution with respect to the depth, and settlement of rail roadbed were measured and compared test results between geotextile container reinforced case and unreinforced case. Thus, the effectiveness of reinforcement was evaluated in terms of its performance and stability.

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온도하중을 고려한 장대레일 궤도의 3차원 좌굴 거동 (Three Dimensional Buckling Analysis of Continuous Welded Rail Track Under Thermal Load)

  • 강준석;임남형;양신추;강영종
    • 한국철도학회:학술대회논문집
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    • pp.471-478
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    • 2000
  • 수 십년 동안 철도는 비교적 짧은 길이의 레일을 신축이음을 두고 연결한 궤도로 건설되었다. 신축 이음은 궤도에 손상과 유지비 증가 등의 많은 단점들을 유발시켰다. 그래서 철도 기술자들은 신축이음부를 제거하는데 관심을 가지게 되었다. 장대레일 궤도는 기존의 레일에 비해 많은 잇점들을 가지게 되었지만, 온도에 의한 갑작스런 횡방향 좌굴이라는 새로운 문제를 야기 시켰다. 본 연구에서는 우선 침목의 영향을 정확히 고려한 장대 레일 궤도의 3차원 해석 모텔과 해석 프로그램을 유한 요소법을 사용하여 개발하여 선형 정적 해석 및 좌굴 해석을 수행할 수 있도록 하였다. 개발된 해석 모델의 특징은 레일요소로 7자유도의 보요소를 사용한 것과 궤도 구성요소의 도심축의 차이를 정확히 고려한 옵셋기법의 사용, 그리고 레일 단면내의 온도 구배를 고려한 것이다. 다음으로, CWRB에 의한 선형 정적해석 및 좌굴해석을 통해, 장대레일 궤도의 거동 및 안정성에대한 다양한 궤도 구성요소들(레일, 도상, 체결재, 침목 등..)의 영향을 고찰하였다.

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도시형 자기부상열차 분기기 구간의 제3궤조 전차선 시스템 개발 (The Development of Third-Rail System Applied to Turn-out Section for Urban Maglev)

  • 민병찬;허영태;홍두영;이원주;조수연;정남철
    • 한국철도학회:학술대회논문집
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    • pp.3046-3051
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    • 2011
  • The third-rail system is an important device supplying power directly to the Maglev train through physical contact with the collecting shoe. It is directly related to safety and reliability for the running of Maglev. However, most the third-rail system used in Korea depend on foreign product or technologies, Korea Urban Maglev in the development of appropriate power feeding is urgent. In particular, the turnout section is the weakness point in the system because bending force by turnout section movement and fatigue caused by repetitive motion as well as the expansion by temperature, the forces by Maglev collecting shoe is added th the third-rail. Therefore, this paper proposes the third-rail system appropriate for Korean Urban Maglev of turnout section. To verify the structural stability of POSCO ICT third-rail system, the finite element analysis and physical testing was performed. The third-rail is fixed on each side of the turn-out section steel structure by epoxy insulation supporter and the integral behaviors are occurred. Therefore, the maximum horizontal displacements of each support are investigated and then, it is applied to finite element model of the third-rail to investigate the moments and stress. Also, the bending test about one million times and Expansion Joint for the third-rail was performed. The third-rail system safety and reliability was identified by test line on Korea Institute of Machinery & Materials in Deajeon for under the actual usage environment such as the Maglev and turn-out operation.

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