• Title/Summary/Keyword: 차륜답면구배

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Analysis on Running Safety for KTX Vehicle (KTX차량의 주행 안전성 해석)

  • Kim, Jae-Chul;Ham, Young-Sam
    • Journal of the Korean Society for Railway
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    • v.10 no.5
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    • pp.473-479
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    • 2007
  • Lateral vibration at the tail of KTX train was found during the acceptance test. In order to settle the problem of lateral vibration, the wheel conicity was changed 1/40 to 1/20. However, we should evaluate the running safety of vehicle with 1/20 wheel conicity because modification of wheel conicity may cause the running performance to be worse and critical speed to reduce. In this paper, we calculate critical speed of KTX bogie as wheel conicity increase and analyze the running safety for KTX that has 20 car trainset formation using VAMPIRE. and compare with the test results of KHST to validate analysis results on high speed line. A analysis results show that critical speed of 0.3 wheel conicity is over 375km/h and curving performance of 1/20wheel conicity is better than 1/40. Also, we examinate the running performance of KTX to check out possibility to increase speed of KTX on conventional line. A analysis results show that it is possible to increase up to 10% the speed of KTX on tangent line but KTX on a curved line should be operated with the speed of conventional train.

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 on the Influence of Wheel/Rail Geometric Parameters on the Equivalent/Conicity (차륜/레일 기하학적 인자에 의한 등가답면구배 영향 분석)

  • Hur Hyun-Moo;Kwon Sung-Tae
    • Journal of the Korean Society for Railway
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    • v.8 no.5
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    • pp.490-494
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    • 2005
  • The geometric parameters between wheel and rail change wheel/rail contact geometry characteristics, and this influence dynamic behavior of rolling stock. So, the selections of optimum geometric parameters between wheel and rail is important for planning of railway system. In this study, we have analyzed the influence of geometric parameters like wheel flange-back distance, gage, and rail inclination on the equivalent conicity relating to dynamic behavior. The analyses show the following results. The widening of wheel flange-back distanc, the decrement of gage increase the equivalent conicity and the increment of rail inclination show the sharp change of the equivalent conicity.

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.

Effects of Wheel Profile on KTX Dynamic Characteristics (차륜답면 형상변화에 따른 KTX의 동특성)

  • 장종기;이승일;최연선
    • Journal of the Korean Society for Railway
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    • v.7 no.3
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    • pp.259-263
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    • 2004
  • The running safety of a railway vehicle depends on the design parameters and contact condition between wheel and rail. In this study, the effect of the conicity of wheel tread is analyzed using ADAMS/RAIL software on running situation. Modal analysis shows in 0.6 Hz natural frequency of lateral mode in fully arranged the KTX cars. The excessive vibration of the tail cars occurs in the 17th car as the speed and the stiffness of the secondary suspension increases, and especially for 1/40 conicity of the GV40 wheel. Also, the analysis shows that combination of wheel profile, GV40 for power cars and XP55 for passenger cars can reduce the lateral vibration of the tail cars.

An Analysis on the Influence of Wheel Flange Wear on the Vibration of EMU (전동차 차륜답면 마모에 따른 차량 진동 특성 영향 분석)

  • Hur, Hyun-Moo;Park, Joon-Hyuk;You, Won-Hee;Park, Tae-Won;Yang, Chil-Sig
    • Journal of the Korean Society for Railway
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    • v.12 no.2
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    • pp.230-235
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    • 2009
  • We have conducted an experimental study to analyze characteristics of the wheel profile wear and an influence of the wheel flange wear on the vehicle's vibration characteristics. In experiment with EMU, wheel profile wear is severe at the beginning of the commercial operation. In this stage, the variations of the wheel dimension parameters and equivalent conicity is changed rapidly. Along with a mileage of the test vehicle, the wear of the wheel flange is increased and also the vibration level of the car-body is increased. The peak-peak mean value of the body vibration is estimated as good level, but the level is approached at the limit of the good level as mileage increases. Especially, the peak-peak maximum value of the body vibration shows the distinct increase of vibration level.

Strength and Dynamic Performance Analysis for Tilting Train Wheel (틸팅차량용 차륜의 구조 강도 및 동적 성능 해석)

  • Hur, Hyun-Moo;Kwon, Sung-Tae;Seo, Jung-Won;Kwon, Seok-Jin
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.11 s.188
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    • pp.85-92
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    • 2006
  • For the improvement of a conventional railway speed, tilting train(Tilting Train express) is under the development aiming for a maximum speed 180km/h. Compared to the existing conventional rolling-stock, tilting train could take an advantage of speed improvement about $20{\sim}30%$ on curve sections due to the improvement of cowing performance. However, this speed increasement creates a severe load at wheels, thus it is necessary to study the safety of wheel for tilting train preferentially. On the other hand, it is under consideration that the wheel for conventional railway rolling-stock at speeds of 150km/h will be applied to tilting train at speeds of 180km/h. In this paper, we have studied the strength of wheel structure, the geometrical contact characteristics, and the dynamic performance of wheel to evaluate the safety of wheel for tilting train.

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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    • 2004.04a
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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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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.