• Title, Summary, Keyword: 차륜답면형상

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Arc-type Wheel Profile Design and Test Results (원호형 차륜답면형상(안) 설계 및 현차시험 결과)

  • 허현무;권성태;이찬우;구동회
    • Journal of the Korean Society for Railway
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    • v.7 no.2
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    • pp.130-136
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    • 2004
  • The rolling-stocks on conventional line have suffered wheel problems due to the incompatibility between wheel and track condition. Especially, The 1:40 coned wheel profile's wear is very severe and these increase wheel maintenance cost. Thus we designed several arc-type wheel profiles coned 1:/20 to reduce the wheel flange wear and analyzed the dynamic performance of designed profiles. Tests carried out in service line to analyse the dynamic performance and verify the wear reduction for two cases of profiles. Test results shows the equal level of dynamic performance and the improvement of wheel flange wear compared with the conical wheel profile coned 1:40.

Stability Evaluation of the Railway Bogie According to the Tread Inclination of Wheel Profile Using Scale Model (축소모델을 이용한 차륜답면형상 답면구배에 따른 안정성 평가)

  • Hur, Hyun-Moo;You, Won-Hee;Kim, Nam-Po;Park, Tae-Won
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.33 no.10
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    • pp.1099-1107
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    • 2009
  • Numerical simulation and experimental study to evaluate the critical speed of the railway bogie according to the tread inclination of wheel profile were conducted using 1/5 scale model. It has been shown that the results of the critical speed analysis for the scale bogie model is very close to the test results using scale bogie model and the critical speed is decreased in proportion to the increase of equivalent conicity of wheel profile. Results of this study show that the scale model could be applied to research area relating to vehicle stability as an alternative to overcome the experimental problems caused by full scale test on the roller rig.

Analysis of Vehicle Dynamic Performance after Wheel Reprofiling (차륜 전삭에 따른 차량 동적성능 분석)

  • Hur, Hyunmoo;Ahn, Dahoon;Youn, Suksoon;Choi, Yongwoon
    • Journal of the Korean Society for Railway
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    • v.19 no.5
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    • pp.565-575
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    • 2016
  • Wheel reprofiling is frequently conducted to remove faults such as flange wear, flat areas, and cracks that occur in railway vehicle operation. We analyzed the dynamic performances of a vehicle before and after wheel reprofiling to grasp the influence of reprofiling on the dynamic behavior of the vehicle. We measured the wheel profile of the test vehicle and conducted a running test to analyze the vibration and comfort characteristics of the test vehicle. The result of the test indicated that vibration of the test vehicle after wheel reprofiling was reduced compared to that before wheel reprofiling. And, comfort level of the test vehicle after wheel reprofiling was improved by about 3dB laterally and vertically. Consequently, the positive effect of wheel reprofiling on the dynamic performance of vehicle was verified.

Analysis on the Running Stability of Rolling-stock according to Wheel Profile Wear (차륜답면형상 마모에 따른 차량 주행안정성 영향 분석)

  • Hur, Hyun-Moo;You, Won-Hee
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.5
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    • pp.551-558
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    • 2011
  • To analyze the effect of wear of wheel profile on the running stability of rolling-stock, theoretical and experimental studies were conducted on the profiles used in conventional lines. In experiment using 1/5 scale model to verify the results of the theoretical analysis, the test results of the critical speed for worn wheel profile samples show similar trend. In case of the conical type wheel profile(Profile 40), the equivalent conicity is increased with flange wear. But in case of the arc type wheel profile(Profile 20h), the equivalent conicity is decreased with flange wear. And the critical speed of the bogie was inverse proportion to the equivalent conicity. It is shown that the variation of the critical speed with the wheel wear could be changed according to the design concept and wear pattern of wheel profile. Results of the theoretical and experimental studies are discussed here.

Design Method of Railway Wheel Profile with Objective Function of Eqivalent Conicity (등가답면구배를 목적함수로 하는 차륜답면형상 설계기법)

  • Hur, Hyun-Moo;You, Won-Hee;Park, Joon-Hyuk;Kim, Min-Soo
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.8
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    • pp.13-19
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    • 2010
  • A design method of railway wheel profile with objective function of equivalent conicity considering wheel dimension constraint, two points contact problem between wheel and rail was proposed. New design method shows good results. New wheel profile generated from optimization process shows better dynamic performance compared with initial profile as the purpose of wheel profile design. And to verify the design method with testing the stability of new wheel profile, we conducted a critical speed test for new wheel profile using scale model applied scaling method of railway vehicle dynamics. The result of critical speed test show good agreement with that of numerical analysis. From the above results, it is seen that the design method with objective function of equivalent conicity is feasible and it could be applied to design new wheel profile efficiently.

A study on the prediction of wheel wear of railway rolling stock (철도차량 차륜마멸예측에 관한 연구)

  • Kang, Bu-Byoung;Chung, Heung-Chai
    • Proceedings of the KSME Conference
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    • pp.1270-1276
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    • 2003
  • This paper describes an analytical method for wheel wear prediction. The outputs from vehicle dynamic software are used to calculation the wheel wear. Two calculation examples are shown for a high-speed line and a conventional line. Through the comparison of two cases, we can see the wheel wear characteristics on the conventional line and the high-speed line. The conventional line has many curved tracks that cause severe wheel flange wear. The influences of curve radius on wheel wear are also described considering the operational performance of the high speed trainset. A method of calculation using contact patch work model is presented for determination of the evolution by wear railway wheels.

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Compatibility Analysis of Wheel/Rail Profile on Conventional Railway (기존철도 차륜/레일형상의 적합성 분석)

  • Hur, Hyun-Moo;Seo, Jung-Won;Chung, Heung-Chai;Goo, Dong-Hoe
    • Proceedings of the KSME Conference
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    • pp.934-939
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    • 2004
  • Railway wheel/rail contact conditions have an influence on dynamic behavior of rolling stock. If there are problems of incompatibility between wheel and rail, damages like wheel wear, wheel spalling, rail wear, etc are occurred. Especially wheel and rail profiles are important factor of vehicle curving performance, so compatibility study between wheel and rail has to be carried out preferentially, In this study, we have analyzed the compatibility between wheel and rail of KNR conventional line to improve the maintenance efficiency of wheel and rail. Thus we showed the results relating to wheel/rail geometric contact, vehicle running performances as the change of wheel/rail combination.

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