• Title/Summary/Keyword: Running test

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Identification of Running Vehicle Properties by Vertical Stiffener Response of Steel Girder Bridge (강 거더교의 수직보강재 응답을 이용한 주행차량의 특성 추정)

  • Lee, Hee-Hyun;Jeon, Jun-Chang;Jung, Min-Sun;Kyung, Kab-Soo
    • Journal of the Korean Society of Safety
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    • v.27 no.1
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    • pp.86-95
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    • 2012
  • The BWIM(Bridge Weigh-In-Motion) is a technology to identify vehicle properties, such as weight, speed, axle spacing and running lane, passing over a bridge by using dynamic response of bridge member. Such information will be used for assessing durability and establishing a maintenance strategy of roadway structures. In this paper, as a first step for developing BWIM system, analytical and experimental studies were conducted in order to verify whether the response of vertical stiffener in steel girder bridge can be used to identify vehicle properties running on the bridge. It was known from this study that such vehicle information could be estimated reasonably by using strain time history curve of a vertical stiffener due to running vehicles. It is because the effect of each axle-load of vehicle appears definitely in the curve. However, as the magnitude of strain of vertical stiffener is effected by running pattern of vehicles, further study is necessary to reduce error when estimating vehicle weight.

A Study on the Reliability Demonstration for Korea High Speed Train Control System (한국형고속철도 열차제어시스템 하부구성요소 신뢰도입증에 관한 연구)

  • Lee, Jae-Ho;Lee, Kang-Mi;Kim, Young-Kyu;Shin, Duc-Ko
    • Journal of the Korean Society for Railway
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    • v.9 no.6 s.37
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    • pp.732-738
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    • 2006
  • This research provides a scheme for Highly Accelerated Stress Test that is necessary to demonstrate reliability prediction of Korean Rapid Transit Railway Train Control System sub-equipment, which is calculated by a relevant standard for failure rate prediction of electronic products. Although determining failure information generated in the process of trial running by statistic analysis is widely accepted as a measure of confirmation for reliability prediction, this research suggests the modeling for System Life Test determined by accelerating stress factors as a measure of confirmation for reliability prediction of sub-equipment unit that is generated ahead of a trial running in System Life Cycle. Consequently, the research demonstrates sub-equipment unit reliability test, which is based on the model derived from Accelerated Stress Test, according to accuracy level and the number of samples, and conducts an official experiment by making out a reliability test procedure sheet based on test time as well.

Performance Predictions for Sailing Yacht by Towing Tests and VPP Calculation (예인수조 시험 및 VPP 계산에 의한 세일링 요트의 성능 추정)

  • Yoo Jae-Hoon;Ahn Hae-Seong
    • Journal of Advanced Marine Engineering and Technology
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    • v.30 no.1
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    • pp.116-124
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    • 2006
  • A model test was carried out, in order to verify the hydrodynamic performances of public 30 feet class sailing yacht. In the initial design stage, the performances and the running attitude of sail yacht including the hull form and sail plan, appendages were estimated by VPP, from which made the representative test conditions. A new experiment system such as captive model device was composed because the running attitude could be changed by wind conditions. The test results show that the minimum resistance is generated in the heeling 20 degree. which was expected in the initial design stage. It is thought to be the useful informations that the keel has an effects on hydrodynamic forces and resistance differences between the upwind and the downwind condition. Also this paper is associated with the state-of-the-art of calculating sailing yacht performance as this is performed in velocity Prediction program (VPP) The VPP results shows a typical shape of a sailing yacht and the designed yacht has the best performance at 120 degree angle of true wind with 20 knots.

Temperature Characteristics for Traction Motor of Korean High Speed Train (한국형 고속전철 전동기 온도 특성)

  • Han, Young-Jae;Kim, Ki-Hwan;Lee, Tae-Hyoung;Koo, Hun-Mo;Kim, Jeong-Cheol
    • Proceedings of the KIEE Conference
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    • 2006.10d
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    • pp.265-267
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    • 2006
  • There are various elements that have influence on safety and reliability of high-speed railway vehicles. Among them, mechanical characteristics of traction motors are very important. Therefore, we verified that temperature characteristics have influence on damage and durability of these parts. We designed a measurement system for temperature test, and could measure the temperature of each device by the system. As the result of temperature test, we could confirm that the traction motors on Korean High-Speed Train satisfy the criteria. From this test, we get information of the traction motor about the temperature characteristic during running speed and running time.

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The cause examination of the crack of the end beam for welding structure type bogie (용접구조형 대차 엔드빔의 균열원인 규명)

  • Hong Jai-Sung;Ham Young-Sam;Lee Dong-Hyong;Sea Jung-Won
    • Proceedings of the KSR Conference
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    • 2004.06a
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    • pp.726-731
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    • 2004
  • Bogie is the connection device between carbody and wheel in railway vehicles. It is the core part that exert a important effect on the passenger safety and running safety. Bogie largely consists of bogie frame, suspension, brake, wheel set. Static and Dynamic load have acted on it complexly. When the bogie is designed, finite element method, static load test, fatigue test, running test should be considered. Some bogie frame of high speed railway freight car have the problem. It's end beam was cracked. The crack of the end beam have a bad effect on brake system. In that case, the cars would be in danger of derailment.

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Analysis of Dynamic Behavior for Design Review of the Korean High Speed Prototype Test Train (한국형 고속전철 시제차량 설계검증을 위한 동특성 해석)

  • ;;Johannes Picht
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2001.05a
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    • pp.1232-1240
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    • 2001
  • In this study. a computer simulation of the Korean High Speed Prototype Test Train was performed to investigate the dynamic behavior(running stability. safety and comfort) in detail design process. The simulation model which was prepared by ADAMS/Rail V10.l consists of power car and middle car assembly (2 motorized cars + 3 trailer cars). The nonlinear analysis takes into account the full vehicle model including wheel/rail contact and the influence of disturbed track. Throughout the dynamic calculation of KHST on the straight and the curved track. accelerations in car body. ride comforts and wheel rail forces were investigated.

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Performance Predictions for Sailing Yacht (세일링 요트의 성능 추정에 관한 연구)

  • Yoo, Jae-Hoon;Ahn, Hae-Seong
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2005.06a
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    • pp.824-831
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    • 2005
  • A model test was carried out, in order to verify the hydrodynamic performances of public 30 feet class sailing yacht. In the initial design stage, the performances and the running attitude of sail yacht including the hull form and sail plan, appendages were estimated by VPP, from which made the representative test conditions. A new experiment system such as captive model device was composed because the running attitude could be changed by wind conditions. The test results show that the minimum resistance is generated in the heeling 20 degree, which was expected in the initial design stage. It is thought to be the useful informations that the keel has an effects on hydrodynamic forces and resistance differences between the upwind and the downwind condition. Also this paper is associated with the state-of-the-art of calculating sailing yacht performance as this is performed in velocity prediction program (VPP). The VPP results shows a typical shape of a sailing yacht and the designed yacht has the best performance at 120 degree angle of true wind with 20 knots.

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A Study on Dynamic Properties Estimation of On-Site Railroad Track (현장 궤도 동특성 추정에 관한 연구)

  • 이희현;남보현;박용진;이종득
    • Journal of the Korean Society for Railway
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    • v.4 no.2
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    • pp.39-46
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    • 2001
  • In this paper, train running test and lateral resistant force test are conducted before and after sprinkling the ballast stabilizer in order to investigate the dynamic behaviors and parameters of the railroad track. The measured results are used to confirm the effect of the stabilizer and to validate the numerical results. From this paper, it is known that the stabilizer used in this study has excellent effect on increasing the vertical rigidity and the lateral resistance, and some correction factors should be considered on masses and rigidities of the track components in order to calculate the vibration magnitude reasonably due to running train.

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A Study on Calculation of Engine Torque for Automotive (자동차의 엔진 토오크 산출에 대한 연구)

  • 나완용
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.4
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    • pp.211-219
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    • 2003
  • The main study experiments to obtain engine torque of the vehicle during performance test of the recent automobile. Torque was measured through the engine dynamometer to produces engine torque of the vehicle but the research method calculated engine torque of the vehicle without the engine dynamometer. The performance of the vehicle receive various running resistance. The study certificates performance of certification before a certification of used vehicle didn't carry out and certificate. This way evaluated on road test and chassis dynamometer The result of the study shows that it is much possible to apply the test. After comparing the engine torque of road driving with that of chassis dynamometer, the results are approximately the same. When rapidly speeded up, the road-load vehicle can pitch in some degrees, which may result in the fluctuations of acceleration, and then affect on the engine torque. Therefore it is confirmed that this method is easier way to measure the performance of vehicles.

A Vehicle Simulator for a Power Car (동력차용 차량 시뮬레이터)

  • Lee, Joo-Hoon
    • Proceedings of the KIEE Conference
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    • 1998.11a
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    • pp.344-346
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    • 1998
  • The OBCS(On-Board Computer System) achieves train system diagnosis and control. For commercial train operation, it must guarantee the reliability for safe and have low cost operational algorithm. To guarantee the diagnosis function and the control ability of OBCS, sufficient actual railway running test under severe conditions is required. But, running test has some limitations for making severe conditions because of safety and it demands quite long time and a lot of costs. So simulator is required and is utilized in many countries. We designed a simulator to test various functions and performance of controllers for high speed train's power car under various conditions and it is represented briefly.

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