• Title/Summary/Keyword: 윤축

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A Three Dimensional Wheelset Dynamic Analysis considering Wheel-rail Two Point Contact (차륜-레일 2점 접촉을 고려한 3차원 윤축 동역학 해석)

  • Kang, Ju-Seok
    • Journal of the Korean Society for Railway
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    • v.15 no.1
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    • pp.1-8
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    • 2012
  • Wheelset dynamic analysis is a key element to determine the degree of accuracy of railway vehicle dynamics. In this study, a three-dimensional wheelset dynamic analysis is presented in such a way that the precise wheel-rail contact analysis in three-dimension is implemented into the dynamic equations of a wheelset. A numerical procedure that can be used for the analysis of a wheelset dynamics when the wheel-rail two point contact occurs in a cornering maneuver is developed. Numerical solutions of the constraint equations and the dynamics equations of a wheelset are achieved by using Runge-Kutta method. The proposed wheelset dynamic analysis is validated by comparison against results obtained from VI-RAIL analysis.

Creative Design of Cap for Wheel and Axle of Railway Vehicle by Using TRIZ/CAE (TRIZ/CAE를 활용한 철도차량 윤축용 캡의 창의적 설계)

  • Huh, Yong-Jeong;Kim, Jae-Min;Hong, Sung-Do
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.6
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    • pp.2581-2587
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    • 2013
  • This paper aims at the design of wheel and axle with cap. The cap is conceptually designed by using TRIZ/CAE. Wheel axle is used at railway vehicle to safety and it is always investigated to reduce the railway vehicle weight. The cap has hollow shaft with the material of SM45C. Cap is located in the bearing seat of wheel and axle. The cap becomes durable within the allowable stress of EN13103, 13104 standard. In this study, the strength of wheel and axle with cap becomes higher than that of hollow shaft. The weight of wheel and axle with cap becomes lower by about 6.75 percent than that of solid shaft. The confidence of wheel and axle with cap can be improved by comparing with solid and hollow shafts.

Dynamic Characteristics of the Noise and Vibration of High-speed Train's Wheelset using Time-varying Frequency Analysis (시간-주파수 분석을 이용한 고속철도차량 윤축에서 발생하는 소음과 진동의 동적 특성)

  • Lee, Jun-Seok;Choi, Sung-Hoon;Kim, Sang-Soo;Park, Choon-Soo
    • Journal of the Korean Society for Railway
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    • v.12 no.4
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    • pp.465-471
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    • 2009
  • In this paper, a relationship between the noise and vibration of a high-speed train's wheelset is examined by using time-varying frequency analysis with random data analysis which together contributes to a reduction in the number of experimental running. The noise and vibration of the wheelset is mainly caused by an interaction between the wheel and railway which shows in non-stationary characteristics. For the analysis, they are measured by some microphones and accelerometers, and those signals are post-processed by time-varying frequency analysis with random data analysis. From the analysis, their methods are useful for analyzing the noise and vibration of high-speed train's wheelset.

Development of a Theoretical Wheelset Model to Predict Wheel-climbing Derailment Behaviors Caused by Rolling Stock Collision (철도차량 충돌에 의한 타고오름 탈선거동 예측을 위한 단일윤축 이론모델 개발)

  • Choi, Se-Young;Koo, Jeong-Seo;You, Won-Hee
    • Journal of the Korean Society for Railway
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    • v.14 no.3
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    • pp.203-210
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    • 2011
  • This study formulates the theoretical wheel-set model to evaluate wheel-climbing derailments of rolling stock due to collision, and verifies this theory with dynamic simulations. The impact forces occurring during collision are transmitted from a car body to axles through suspensions. As a result of combinations of horizontal and vertical forces applied to axles, rolling stock may lead to derailment. The derailment type will depend on the combinations of the horizontal and vertical forces, flange angle and friction coefficient. According to collision conditions, the wheel-lift, wheel-climbing or roll-over derailments can occur between wheel and rail. In this theoretical derailment model of wheelset, the wheel-climbing derailment types are classified into Climb-over, Climb/roll-over, and pure Roll-over according to derailment mechanism between wheel and rail, and we proposed the theoretical conditions to generate each derailment mechanism. The theoretical wheel-set model was verified by dynamic simulations.

Study on Mechanical Parameters of a Wheelset Influencing Derailment of Rolling Stock (철도차량탈선에 영향을 미치는 윤축의 기계적 인자에 관한 연구)

  • Oh, Hyun Sun;Koo, Jeong Seo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.10
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    • pp.1207-1218
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    • 2013
  • It is difficult to predict derailment with the existing derailment coefficient like Nadal's formula which is based on the contact forces between one wheel and rail. A new derailment coefficient model developed on a wheelset is able to make a better estimate about the climb derailment, slip derailment, roll over derailment, and mixed derailment types of these. Moreover, not only the mechanical factors considered in the existing derailment coefficients but also other various factors affecting derailment such as wheel unloading and loading, diameter of wheel, and locations of axle-box bearings can be covered with this new derailment coefficient model. That is, the derailment patterns which couldn't be solved with the existing formulas such as Nadal's and Weinstock's models can be analyzed with this wheelset derailment coefficient model because of considering various factors causing derailment. Finally, the validity of the new derailment coefficient model is verified using dynamic model simulations.

A Study on the Wheelset Behavior on the Roller Rig for Railway Bogie Testing (대차 주행시험대상에서의 윤축 거동에 대한 연구)

  • Hur, Hyun-Moo;Park, Joon-Hyuk;You, Won-Hee;Park, Tae-Won
    • Proceedings of the KSME Conference
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    • pp.1207-1212
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    • 2007
  • The critical speed of railway bogie related to the stability of the railway rolling-stock is important. Testing of the dynamic performance of bogie is conducted using a roller rig in a laboratory in place of field testing on track. This roller rig is composed of two rollers equivalent to track and used to test the dynamic characteristics of vehicle. But, the geometrical characteristics of the wheel/roller contact on the roller rig are different from those of the wheel/rail contact because the longitudinal radius of roller is not infinite compared with rail. This difference has influence on the wheelset behavior and the critical speed of bogie. Therefore in this paper, we have studied the behavior of wheelset and bogie on the roller rig for railway bogie testing with the purpose of developing the scaled roller rig. As an analysis results, it has been shown that the critical speed of bogie on the roller rig is slightly lower than that of bogie on track.

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