• Title, Summary, Keyword: 휠-레일 접촉

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Railway vehicle dynamic analysis using an 3-dimensional wheel-rail contact analysis (3차원 휠-레일 접촉해석을 이용한 철도차량 동역학 해석)

  • Kang, Ju-Seok
    • Proceedings of the KSR Conference
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    • pp.18-24
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    • 2010
  • Conventional methods for railway vehicle dynamic analysis have mostly relied on the approximate method based on 2-dimensional contact analysis. Recently, 3-dimensional approaches to achieve an accurate solution for wheel-rail contact analysis have been proposed, but are not practical to apply to actual simulation due to time-consuming processes. The main focus of this study is to present a new method of railway vehicle dynamic analysis by calculating wheel-rail contact forces based on efficient 3-dimensional wheel-rail contact analysis. A 3-dimensional wheel-rail contact analysis and numerical analysis of wheelset dynamic equations will be presented.

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A Study on Dynamic Modeling and Analysis of a Wheelset (휠셋의 동역학 모델링 및 해석에 관한 연구)

  • Kang, Ju-Seok
    • Proceedings of the KSR Conference
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    • pp.1851-1855
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    • 2011
  • The accuracy of wheel-rail contact analysis is mainly determined by the methods to find wheel-rail contact points and to calculate contact forces. The 2-dimensional approach which calculates contact points based on the profile curves of the wheel and rail has advantage of reducing calculation time but shortage of approximating the solutions when comparing with 3-dimensional analysis In this analysis, wheelset dynamic behaviors calculated by the approach based on the 2-dimensional wheel-rail curves are compared with those by the 3-dimensional wheel-rail surfaces. Yaw angle and lateral displacement of wheelset center are compared when negotiating a curve.

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Dynamic Interaction Analysis of Train-bridge Considering Rail-wheel Contact Mechanism (윤축-레일 접촉메카니즘을 고려한 열차-교량 동적상호작용 해석)

  • Min, Dong-Ju;Kwark, Jong-Won;Kim, Moon-Young
    • Journal of the Korean Society for Railway
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    • v.18 no.4
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    • pp.363-373
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    • 2015
  • The purpose of this study is to develop a nonlinear algorithm for the dynamic interaction analysis of KTX trains and bridge girders with consideration of separation and flange contact phenomena between wheel and rail. For this, three interaction models between wheel-rail are implemented and compared through numerical examples. That is, the spring model and the non-jump model are briefly explained, and a nonlinear contact model is then proposed to accurately simulate interaction forces of the train-bridge system. Dynamic interaction analysis of a simply supported girder and trains is performed and the analyzed results are presented and compared for the proposed contact model and the other model types. Particularly, flange contact phenomena in the nonlinear contact model are demonstrated under a specific condition.

Development of a Dynamic Simulation Program Including a Wheel-Rail Contact Module (휠-레일 접촉모듈을 포함한 동역학 해석 프로그램 개발)

  • Cho, Jae-Ik;Park, Tae-Won;Yoon, Ji-Won;Lee, Soo-Ho;Jung, Sung-Pil
    • Journal of the Korean Society for Railway
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    • v.13 no.1
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    • pp.16-22
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    • 2010
  • Various programs for dynamic simulation of the railway vehicle have advantages and disadvantages. These programs have limitation that cannot express a large deformable body for an wire of the railway vehicle. In this study, a program for dynamic simulation of the railway vehicle is developed. And the rigid, flexible and large deformable body can be simulated using this program. Its reliability is verified by comparison with a commercial program. Also, a wire is considered as the large deformable body and a sliding joint which connects the rigid body to the large deformable body is included. Moreover, as the wheel-rail contact module is added, the dynamic simulation of the railway vehicle can be analyzed using the developed program.

A 3-dimensional Wheel-rail Contact Analysis of Railway Vehicle with 2-point Contacts (2점 접촉을 고려한 철도차량의 3차원 휠-레일 접촉해석)

  • Kang, Ju-Seok
    • Transactions of the Korean Society of Automotive Engineers
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    • v.18 no.3
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    • pp.43-52
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    • 2010
  • In this study, the shapes of the wheel and rail are represented by using 3-dimensional surface functions with surface parameters and a 3-dimensional wheel-rail contact analysis is presented. A whole numerical solution of wheel-rail contact at tread and flange including 2-point contacts can be achieved with the proposed numerical algorithm. Kinematic characteristics such as variances of vertical displacement and roll angle, and variance of wheel radius difference for arbitrary yaw and lateral displacement of wheelset, are determined for the KTX wheel-rail pair as an example. The condition of yaw and lateral displacement occurring 2-point contacts to analyze derailment are compared between standard and worn wheels. Differences of contact characteristics between curved and straight rails are also analyzed.

A study on the Shape Design Contact Characteristic of Wheel-Rail for Rollng Stock (2) (철도차량용 휠과 레일의 접촉특성 해석 및 형상설계에 관한 연구 (2))

  • Seong, Gi-Deuk;Yang, Won-Ho;Jo, Myeong-Rae;Heo, Seong-Pil
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.5
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    • pp.1238-1245
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    • 2000
  • One of the main causes of severe wear or crack initiation in wheel and rail is the contact stress due to wheel-rail contact. First, we obtain contact stress due to the rail mounting slope using the finite element method. Second, the shape design based on more reasonable contact stress analysis rather th~n a general Hertzian contact theory is investigated in order to reduce the contact stress. The optimum -design is performed using the simple 2-D finite element model and its results are verified by 311) finite element analysis.

A Study on the Contact Behavior of Stress-Displacement Characteristics for an Inclined Rail-Wheel Contact Mode (레일-휠의 접촉면 경사도에 따른 응력-변위량의 거동특성에 관한 연구)

  • 김청균
    • Journal of the Korean Society for Railway
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    • v.7 no.3
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    • pp.186-192
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    • 2004
  • Using the finite element method, rail-wheel contact model has been analyzed for mechanical loads due to passengers and payload of the train. This paper presents an investigation on how tapered wheel and inclined rail surfaces affect the contact stress and displacement of rail-wheel contacting surface under mechanical loads. For a numerical analysis, the tapered faces of the wheel are considered as 2.5% and 5.5%. And two models of the tilted rail are also considered as 40:1 and 20:1 at the bottom of the rail. The computed results based on the contact stress and displacement FE analysis indicate that the tilting ratio of the rail, 20:1 with a tapered face of the wheel, 2.5% may be more stable compared to that of 40:1 tilting model and 5.5% tapered wheel face.

A Study on the Shape Design of Wheel-Rail for Rolling Stock (철도차량용 휠과 레일의 형상설계에 관한 연구)

  • Seong, Gi-Deuk;Yang, Won-Ho;Jo, Myeong-Rae;Heo, Seong-Pil
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.23 no.11
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    • pp.2033-2039
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    • 1999
  • One of the main causes of severe wear or crack initiation in wheel and rail is the contact stress due to wheel-rail contact. In this paper, the shape design based on more reasonable contact stress analysis rather than a general Hertzian contact theory is investigated in order to reduce the contact stress. The optimal design is performed using the simple 2-D finite element model and its results are verified by 3-D finite element analysis.

Contact point analysis for wheel/rail contact force calculation (휠/레일간의 접촉력 계산을 위한 접촉점 해석 알고리즘)

  • 박정훈;임진수;황요하;김창호
    • Proceedings of the KSR Conference
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    • pp.429-436
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    • 1998
  • In this paper, we derive the algorithm for calculating contact point between wheel and rail and develop the method for track modeling. The proposed methods use travelling distance to represent track center line poistion vector and track orientation with respect to Newtonian reference frame. The proposed methods can be easily used in multibody dynamic analysis. Two numerical examples are given to verify the validity of the proposed methods.

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