• Title, Summary, Keyword: 철도차량 동역학

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Calculation of Critical Speed of Railway Vehicle by Multibody Dynamics Analysis (다물체 동역학 해석방법을 이용한 철도차량의 임계속도 계산)

  • Kang, Juseok
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.11
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    • pp.1371-1377
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    • 2013
  • In this analysis, a method is presented to calculate the critical speed of a railway vehicle by using a multibody dynamic model. The contact conditions and contact forces between the wheel and the rail are formularized for the wheelset model. This is combined with the bogie model to obtain a multibody dynamic model of a railway vehicle with constraint conditions. First-order linear dynamic equations with independent coordinates are derived from the constraint equations and dynamic equations of railway vehicles using the QR decomposition method. Critical speeds are calculated for the wheelset and bogie dynamic models through an eigenvalue analysis. The influences of the design parameters on the critical speed are presented.

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.

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 Linear Model of Lateral Dynamics of the KRRI All Wheel Steered Vehicle (KRRI 전륜 조향 차량의 횡 방향 선형 동역학 모델)

  • Kim, Young-Chol;Yun, Kyoung-Han;Min, Kyung-Deuk;Byun, Yun-Seob;Mok, Jai-Kyun
    • Proceedings of the KIEE Conference
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    • pp.230-231
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    • 2008
  • 본 논문은 KRRI 전륜 조향 차량의 횡 방향 동역학 모델링에 대한 내용을 기술한다. 이 차량은 굴절버스 형태를 갖고 모든 차륜의 조항이 가능하며 트레일러와 트랙터의 후륜이 독립적으로 구동 가능한 시스템을 갖고 있다. 이 시스템의 모델링은 비선형 동역학 방정식을 유도하고 선형화 한 뒤 횡 방향 동역학 모델만을 분리해서 최종적으로 횡 방향 선형 동역학 모델을 유도하는 과정을 거친다. 마지막으로 시뮬레이션을 통해 선형 모델을 검증한다.

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Kinematics Analysis of Tilting Mechanism for Korea Tilting Train with 180km/h Service Speed (180km/h급 한국형 틸팅차량의 틸팅 메카니즘 기구동역학 해석)

  • Ko Tae hwan;Kim Nam-Po;Goo Dong-Hoi
    • Proceedings of the KSR Conference
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    • pp.8-14
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    • 2003
  • 곡선부가 많은 국내 기존선의 속도향상을 위한 틸팅차량의 개발은 기존선의 전철화에 따른 고속화를 위해 그 필요성이 부각되고 있다. 일반 고속차량과 다른 주행 메카니즘을 가지고 있는 틸팅차량의 주요 기술을 확보하기 위한 틸팅대차와 틸팅시스템의 개발과 연구는 한국철도의 기술력 향상에 큰 역할을 할 것이다. 180km/h급 한국형 틸팅차량의 틸팅 메카니즘 기구동역학 해석을 통하여 틸팅 대차를 형성하는 주요 파라메터들의 변화에 따른 틸팅 메카니즘의 특성과 영향력을 검토한다. 이를 통하여 최적의 틸팅운동을 수행할 수 있는 주요 파라메터의 값을 제시함으로서 틸팅차량이 요구하는 최적의 틸팅 메카니즘을 구현하고자 한다. 이 연구를 통해서 얻어지는 결과들은 팅팅 대차용 엑츄에이터의 성능 설계와 해석의 기반 자료로 사용되어진다.

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A Wheel Wear Analysis of Railway Vehicle on a Curved Section (곡선 구간에서 철도 차량 휠의 마모 특성 해석)

  • Kang, Juseok
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.40 no.6
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    • pp.547-555
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    • 2016
  • The wheel wear of a railway vehicle is mainly generated when maneuvering on a curved track. The change in the wheel profile affects the dynamic stability of the vehicle. In this analysis, the wheel wear volume was calculated while changing the velocity and radius of the curve to analyze the wear characteristics of a wheel at a curved section. The wear index was calculated from a vehicle dynamic analysis based on a multibody dynamics analysis and wear volume from a wear model by British Rail Research. The wear volume at a radius of 300 m is dominant compared with other radii. The wear volume was calculated by assigning different coefficients of friction to the tread and flange of the wheel to investigate the effect of lubrication on the wear characteristics. The effect of the improvement by lubrication is calculated by varying the radius of the track, and is assessed on an actual urban railway section.

Analysis on the Lateral Stiffness of Coil Spring for Railway Vehicle (철도차량용 코일스프링 횡강성 해석)

  • Hur, Hyun-Moo;Ahn, Da-Hoon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.9
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    • pp.84-90
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    • 2018
  • In constructing the multi-body dynamics model to analyze the behavior of the railway vehicle, it is very important to understand the properties of the suspension elements that constitute the suspension system. Among them, coil springs, which are mainly used in primary and secondary suspension systems, clearly show the axial stiffness in the drawings, but the lateral properties of the coil springs are not specified clearly, making it difficult to construct a dynamic analysis model. Therefore, in this paper, the model for analyzing the lateral stiffness of the coil spring is examined. A finite element method was applied to analyze the lateral stiffness of the coil spring and numerical analysis was performed by applying the coil spring lateral stiffness analysis model proposed by Krettek and Sobczak. And the test to analyze the lateral stiffness of coil spring was conducted. As a result of comparing with the test results, it was found that the results obtained by applying the lateral stiffness analysis model of Krettek and Sobczak and correcting the correction coefficient are similar to those of the test results.

Multibody Dynamic Simulation and Running Characteristics of DMT Freight (다물체 동역학해석을 이용한 DMT 화차의 주행특성 연구)

  • Lee, Seung-Il;Eom, Beom-Gyu;Lee, Hi-Sung
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.19 no.1
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    • pp.35-41
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    • 2009
  • Through the multibody dynamic simulation, the analysis model of the modalohr freight car of the DMT freight car was developed. By using the developed analysis model, the running dynamic characteristics was inquired through the dynamic analysis about the modalohr freight car. As the running speed and the primary suspension were increased, the lateral and vertical vibration accelerations of the car-body and the bogie were also increased. In case of the lateral vibration acceleration of the car-body, however, review should be considered since it can be influenced by the nonlinear characteristic of the primary suspension. The lateral and vertical vibration of the car-body were generated at the frequency of $2{\sim}3\;Hz$ and $7{\sim}8\;Hz$. And the lateral and vertical vibration of the bogie were generated at the frequency of $25{\sim}35\;Hz$ at the low speed section, $40{\sim}50\;Hz$ at the high speed section.

A Study on the Dynamic Analysis of Railway Vehicle by Using Track Coordinate System (트랙좌표계를 이용한 철도차량의 동역학 해석에 관한 연구)

  • Kang, Juseok
    • Transactions of the Korean Society of Automotive Engineers
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    • v.21 no.2
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    • pp.122-130
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    • 2013
  • Rail geometries such as cant, grade and curvature can be easily represented by means of a track coordinate system. In this analysis, in order to derive a dynamic and constraint equation of a wheelset, the track coordinate system is used as an intermediate stage. Dynamic and constraint equations of railway vehicle bodies except the wheelset are written in the Cartesian coordinate system as a conventional method. Therefore, whole dynamic equations of a railway vehicle are derived by combining wheelset dynamic equations and dynamic equations of railway vehicle bodies. Constraint equations and constraint Jacobians are newly derived for the track coordinate system. A process for numerical analysis is suggested for the derived dynamic and constraint equations of a railway vehicle. The proposed dynamic analysis of a railway vehicle is validated by comparison against results obtained from VI-RAIL analysis.

Study on a 2-Dimensional Dynamic Modeling Technique to Analyze the Overriding Phenomena of Rollingstock (열차의 타고오름 해석을 위한 2차원 충돌동역학 모델링 기법 연구)

  • Kim, Geo-Young;Koo, Jeong-Seo;Kwon, Tae-Soo
    • Journal of the Korean Society for Railway
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    • v.14 no.1
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    • pp.11-18
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    • 2011
  • This paper proposed a new 2-D multi-body dynamic modeling technique to analyze overriding behaviors taking place during train collision. This dynamic model is composed of nonlinear springs, dampers and masses by considering the deformable characteristics of carbodies as well as energy absorbing structures and components. By solving this dynamic model for rollingstock, energy absorbing capacities of collision elements, accelerations of passenger sections, impact forces applied to interconnecting devices, and overriding displacements can be well estimated. For a case study, we chose KHST (Korean High Speed Train), obtained crush characteristic data of each carbody section from 3-D finite element analysis, and established a 2-D multi-body dynamic model. This 2-D dynamic model was simulated under the train-to-train collision scenarios, and evaluated with 3-D virtual testing model. It was founded from the simulation results that this 2-D dynamic model could well predict overriding behaviors, and the modeling technique of carbody deformation was very important in overriding estimation.