• Title, Summary, Keyword: Bogie

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The Bogie Bunting Sensors quality Inspection (고속열차의 대차불안정감지센서 시험에 대한 연구)

  • Cha, Geun-Su;Jeon, Seong-Joon;Shon, Kang-Ho
    • Proceedings of the KSR Conference
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    • pp.603-612
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    • 2009
  • The bogie hunting sensor detects accelerations of a bogie. It transmits those accelerations using frequency modulated signal to the TCMS(Train Control and Management System) electronics for functional processing. TCMS decide undesirable bogie hunting and high speed instability with frequency modulated signal. The bogie hunting sensor is essential component for safety driving of high speed train. The bogie hunting sensor's quality inspection before sensor is installed on bogie is very important. Therefore it is required equipment for exact inspection of train bogie hunting sensor. This study is about development of Bogie Hunting sensor's inspection equipment that we can improve Bogie Hunting sensor's quality. Accordingly, I suppose that this thesis will be utilized to improve the bogie hunting sensor's quality thru exact inspection.

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The structural analysis of bogie for high speed freight car (고속화차용 용접대차의 구조강도해석)

  • 황원주;함영삼;권성태;허현무;전응식
    • Proceedings of the KSR Conference
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    • pp.217-221
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    • 2001
  • Barber bogie and Y25 bogie is the main bogie of freight car which is used in the Korean railway. In case of Barber bogie and a mixed formation tile maximum speed limit of empty car is 70 km/h and that of loaded car is 90 km/t and also it runs a speed of 110 km/h in time of an exclusive formation of Y25 bogie. The car named as high speed freight car at present is Y25 bogie which modeled on the Y25 bogie or Europe developed in 1993, Y25 bogie has no problem about the running capacity up to the speed of 110 km/h, but it works as limiting factors to tile increasing cost of maintenance and repair expenses which caused by repair of bogie and the cost of materials. This study is going to describe the contents examined by analysis and tests, aimed at being used as an index of plan in the future through the strength test of high speed freight car which is used now.

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The Estimation of Structural Strength of Improved Frame of Welded Bogie for High Speed Freight Car (고속화차용 용접대차 프레임 개선모델의 강도평가)

  • 황원주;함영삼;강부병;전응식
    • Proceedings of the KSR Conference
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    • pp.235-239
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    • 2001
  • The bogie of high speed freight car running on conventional line is welded bogie modeled on Y25 bogie developed in Europe. Y25 bogie has speed limit of 110km/h. But it has limiting factors to speed-up as increasing maintenance cost and friction parts pedestal. And also it was reported that cracks are found in the parts where center beam meet bolster and endbeam near bracket for braking part. This study includes stress analysis improved structure of welded bogie for strength evaluation by numerical method and experimental method. According to the study, new configuration bogie shows improvement in strength.

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The Study of the System of In-Board Bogie for EMU (전동차용 인보드 대차 시스템에 대한 고찰)

  • Kim Cheol-Geun;Oh Hyeung-Sik;Jung Hoon
    • Proceedings of the KSR Conference
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    • pp.592-596
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    • 2003
  • In general the limit of EMU bases on the construction gauge. But to save the cost for construction, there is often a case that the gauge of construction for bogie is narrower than the existing gauge. Finally, out-board bogie type cannot be applicable because of the space. In this case, we can use the in-board bogie type which the support distance of both suspensions is narrower than out-board bogie. But we cannot use an in-board bogie indifferently because car with in-board bogie must also have the same performance as out-board bogie in wider gauge. Accordingly, we have to consider how many moments in the suspensions are applied due to the narrower support distance. And the characteristics of suspensions in the in-board bogie must be decided from the moments.

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Effect of bogie fairings on the snow reduction of a high-speed train bogie under crosswinds using a discrete phase method

  • Gao, Guangjun;Zhang, Yani;Zhang, Jie;Xie, Fei;Zhang, Yan;Wang, Jiabin
    • Wind and Structures
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    • v.27 no.4
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    • pp.255-267
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    • 2018
  • This paper investigated the wind-snow flow around the bogie region of a high-speed train under crosswinds using a coupled numerical method of the unsteady Realizable $k-{\varepsilon}$ turbulence model and discrete phase model (DPM). The flow features around the bogie region were discussed and the influence of bogie fairing height on the snow accumulation on the bogie was also analyzed. Here the high-speed train was running at a speed of 200 km/h in a natural environment with the crosswind speed of 15 m/s. The mesh resolution and methodology for CFD analysis were validated against wind tunnel experiments. The results show that large negative pressure occurs locally on the bottom of wheels, electric motors, gear covers, while the positive pressure occurs locally on those windward surfaces. The airflow travels through the complex bogie and flows towards the rear bogie plate, causing a backflow in the upper space of the bogie region. The snow particles mainly accumulate on the wheels, electric motors, windward sides of gear covers, side fairings and back plate of the bogie. Longer side fairings increase the snow accumulation on the bogie, especially on the back plate, side fairings and brake clamps. However, the fairing height shows little impact on snow accumulation on the upper region of the bogie. Compared to short side fairings, a full length side fairing model contributes to more than two times of snow accumulation on the brake clamps, and more than 20% on the whole bogie.

Running Safety of High Speed Freight Bogie (고속주행용 화차 대차의 주행안전성)

  • 이승일;최연선
    • Proceedings of the KSR Conference
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    • pp.179-186
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    • 2001
  • As the freight traffic becomes heavier, the high speed of existing freight cars is essential instead of the construction of a new railway. The high speed can be achieved by the design modifications of the freight bogie. In this paper, an analytical model of freight bogie including the lateral force between rail and the flange of wheel is developed to decide the critical speed, which activates a hunting motion and tells the running safety of freight bogie. The dynamic responses of the analytical model were compared with an experimental data from a running test of a freight bogie and showed good agreements between them. The analytical model is used to find the design modifications of the freight bogie by parameter studies. The results show that the reduction of wheelset mass ratio and the increase of the axle distance of the freight bogie can increase the critical speed, but the primary lateral stiffness has little effects on the critical speed. And this also study shows that smaller wheel conicity deteriorates the running safety of the freight car, which means the overhauling of the wheel of freight bogie should be done regularly.

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Static and Fatigue Analysis of Bogie Rotating Frame for a Light Rail Train (경량전철 대차 선회프레임의 정적강도와 피로특성의 분석)

  • 구정서;한형석;조현직;송달호
    • Journal of the Korean Society for Railway
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    • v.5 no.4
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    • pp.222-230
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    • 2002
  • The rotating bogie frame is used in the bogie for a Light Rail Train under development in Korea. In development of the bogie, the structural strength and fatigue characteristics of the rotating bogie frame have been evaluated under the predefined load cases according to the Korean standards for a urban EMU. No part of the rotating bogie frame was subjected to stress beyond the fatigue endurance limits of the material used when grinding the welding of the lower plate link. It is concluded that the rotating bogie frame is safe in view of its static and fatigure strength.

Development of the Scale Track to Test Bogie Steering Performance (대차 조향 특성 시험을 위한 축소 트랙 개발)

  • Hur, Hyun-Moo;Park, Jun-Hyuk;You, Won-Hee;Park, Tae-Won
    • Proceedings of the KSR Conference
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    • pp.301-305
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    • 2007
  • The performance of the railway bogie is classified into the stability and the steering performance. Testing for the bogie stability is conducted on the roller rig. But testing for the bogie steering performance on test facility is very difficult, so the testing for the vehicle curving performance is conducted on the real curve track. And it is desirable to test on the full scale test rig, but it caused many problems relating to test costs, test time. To overcome these problems, the small scale test rig is actively used in the field of bogie stability. Thus, in this paper, we have studied the scale track to test the bogie steering performance. For this, we designed the 1/5 scale test track equivalent to radius 200 curve and confirmed the validity of the testing for the bogie steering performance on the scale curve track through the testing using 1/5 scale bogie.

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Verifying of steering performance of the steering bogie (조향대차의 곡선선로 주행시 조향성능 검토)

  • Kim, Jung-Ha;Yang, Hee-Joo;Ahn, Jae-Kwang
    • Proceedings of the KSR Conference
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    • pp.1069-1073
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    • 2011
  • When the train is running on the small curved line, there would be severe contact between the rail and wheels, which cause noise and vibration as well as abnormal wear on the rail and the wheels. In order to solve these problems, the steering bogie has been developed. To verify steering performance of the steering bogie, steering angles of two trains, one is the advanced EMU with the steering bogie, another is a conventional EMU with the conventional bogie, were measured while running on the small curve. this comparing test shows that the steering bogie has much higher steering performance than the conventional bogie on the same curved line. To verify more performance data of the steering bogie, further testing and monitoring will be done with the advanced EMU in the test track.

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A Study on Load Test of Bogie for High Speed Electrical Multiple Unit (고속용 전동차 대차의 하중시험에 관한 연구)

  • Kim W.K.;Yoon S.C.;Jun C.S.;Kwon S.T.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.34-38
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    • 2005
  • This paper describes the result of load test of a bogie frame. The purpose of test is to evaluate the safety which bogie frame shall be considered fully sufficient rigidity so as to satisfy proper system function under maximum load. Bogie system consist of the bogie frame, suspensions, wheel-sets, a brake system and a transmission system. Among these component, the bogie frame is most significant component subjected to the vehicle and passenger loads. The evaluation method is used the JIS E 4207 specifications throughout the static load test. The test results have shown the bogie frame to be safe and stable under design load conditions.

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