• Title, Summary, Keyword: Wheel Profile

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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.

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.

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.

The Effectiveness Test of Improved Wheel Profile by Using Microphones (마이크로폰을 이용한 개선된 차륜답면 효과 시험)

  • Moon Kyeong-Ho;Hur Hyun-Moo;Kim Jae-Chul
    • Proceedings of the KSR Conference
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    • pp.664-669
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    • 2004
  • In rolling stock, wheels are one of the most important components to run on the track in safety. Especially, it is important that wheel profile cause the variation of dynamic characteristics and running safety. The purpose of this paper is to propose the wheel profile and to know the effectiveness of improved wheel profile by using microphones. We also performed analysis of running safety to know application of improved wheel profile before the test. In result, the improved wheel profile was stable in running safety and noise level was reduced.

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Design of Wheel Profile to Reduce Wear of Railway Wheel (곡선부에서 차륜 마모 저감을 위한 차륜답면 형상 설계)

  • Choi, Ha-Young;Lee, Dong-Hyong;Song, Chang-Yong;Lee, Jong-Soo
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.6
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    • pp.607-612
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    • 2012
  • The wear problem of wheel flange occurs at sharp curves of rail. This paper proposes a procedure for optimum design of a wheel profile wherein flange wear is reduced by improving an interaction between wheel and rail. Application of optimization method to design problem mainly depends on characteristics of design space. This paper compared local optimization method with global optimization according to sensitivity value of objective function for design variables to find out which optimization method is appropriable to minimize wear of wheel flange. Wheel profile is created by a piecewise cubic Hermite interpolating polynomial and dynamic performances are analyzed by a railway dynamic analysis program, VAMPIRE. From the optimization results, it is verified that the global optimization method such as genetic algorithm is more suitable to wheel profile optimization than the local optimization of SQP (Sequential Quadratic Programming) in case of considering the lack of empirical knowledge for initial design value.

Design of Railway Vehicle Wheel Profile Suitable for Dual-rail Profile (듀얼 레일 형상에 적합한 철도차량의 차륜 형상 설계)

  • Byon, Sung-Kwang;Lee, Dong-Hyeong;Choi, Ha-Young
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.16 no.3
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    • pp.30-37
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    • 2017
  • When a wheel profile of a train-tram is designed, both train and tram tracks should be considered. This study designed a wheel profile that enables high-speed driving(200km/h) on the train track and low speed driving on the tram track with multiple sharp curves. The study used the approximation optimization method to reduce cost and time, used the sequential quadratic programming method as the optimized algorithm, and the central composite design and response surface method as an approximate model. The optimized wheel shape based on this approximation optimization method reduced wear of the initial wheel showed a better performance in terms of derailment and lateral force.

The study of propriety of wheel profile for DMRC EMU (인도 전동차 차륜 프로파일 적정성 검토)

  • Jung, Jae-Hee;Oh, Hyeung-Sik;Kim, Chul-Keun
    • Proceedings of the KSR Conference
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    • pp.936-940
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    • 2008
  • After the introduction of revenue service, abnormal wear has been reported on DMRC EMU wheels that have been manufactured and delivered by Rotem. As a part of an investigation of cause, Rotem has carried out the study of propriety between wheel and rail profile. The wheel profile of DMRC EMU is SK-91146. The material and profile of the wheel was presented by DMRC. The Profile of the rail is UIC 60-1:20. This study tested the propriety of three wheel profiles to include, SK-91146, EN 13715-P8 and UIC s1002 between the rail profile UIC 60-1:20.

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Contact Stress Analysis on the Variation of Wheel Profile (차륜답면의 형상변화에 의한 접촉응력분포 해석)

  • Kim Eui-Seok;Hur Hyun-Mo;Yun Chun-Han
    • Proceedings of the KSR Conference
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    • pp.663-667
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    • 2003
  • Mechanical force acted on the rail wheel causes excessive wear and increases the maintenance cost. The present paper proposes newly designed wheel profiles in order to reduce the contact stress. Numerical analysis on the stress distribution of wheel-rail contact stress is carried out using ABAQUS, a commercial finite element code. The result of KNR1/40 conical wheel is compared to those of the proposed wheels, all of which are arc wheel profile type.

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A Study on the Parameters for Hunting of the Rolling-stock (철도차량 사행동에 미치는 인자에 관한 연구)

  • Hur, Hyun-Moo;You, Won-Hee
    • Proceedings of the KSR Conference
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    • pp.98-103
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    • 2006
  • The hunting is the natural characteristics of the railway wheelset which is originated from the contact between the conical type wheel profile and rail. The critical speed of rolling-stock is called when the hunting is occurred, and it is closely connected with vehicle stability. The parameters which influence the hunting motion are like wheel profile, primary spring property and wheelset dimension, etc. The studies for these parameters are reported diversely. In this study, we aim to analyze the influence of parameters on hunting with the change of wheel profile produced by wheel wear and material property produce by aging of primary spring. For this, we made a dynamic model for wheelset and vehicle. Using these models, we analyzed the critical speed with the variations of the parameters like as wheel profile and primary spring property and we show the results.

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Optimisation of Rolling Stock Wheelset Life through Better Understanding of Wheel Tyre Degradation

  • Vermeij, I.;Bontekoe, T.;Liefting, G.;Peen, J.
    • International Journal of Railway
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    • v.1 no.3
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    • pp.83-88
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    • 2008
  • Since the 1990's the fleet of the Dutch Railways showed a dramatic decrease in wheel tyre life. This lifetime reduction led to an unacceptable increase in life cycle costs. Therefore Lloyd's Register Rail has proposed to NedTrain to investigate the possibilities of improving the wheel tyre life. Three improvements were determined as most promising and relatively easy to achieve: - Profile optimisation for Rolling Contact Fatigue (RCF) reduction - a new wheel profile has been developed with a better resistance against rolling contact fatigue of the wheel tread. The profile has been implemented on single deck intercity trains and shows an increase in wheel tyre life of 30%. - Selection of improved wheel tyre materials - combining information from literature and experiences of manufacturers five alternative wheel tyre materials have been selected and are now being tested in practice. - Optimisation of the maintenance strategy - an alternative, preventative maintenance regime has been developed. With this Scraping regime, during short term maintenance every wheel is reprofiled. Higher mileages are reached and savings on life cycle costs up to 50% and more have been achieved. Unplanned maintenance goes down with $30{\sim}60%$. The results from field tests, using a reference group for comparison, and preliminary results after implementation show that the increase in wheel tyre life that is achieved with this project is significant. The results will continue to be monitored using the asset management tool 'Wheel Watch', that was specially developed for this project and is also described in this paper.

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