• Title, Summary, Keyword: 철도차량 동역학

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Development and Verification of the Steering Algorithm for Articulated Vehicles (굴절차량에 대한 조향알고리즘 개발 및 검증)

  • Moon, Kyeong-Ho;Lee, Soo-Ho;Mok, Jai-Kyun;Park, Tae-Won
    • Journal of the Korean Society for Railway
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    • v.11 no.3
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    • pp.225-232
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    • 2008
  • AWS (all wheel steering) is applied to improve the stability and the turning performance. Most automotive cars are mainly controlled by FWS (front wheel steering) system except some cars which are made to improve their stability by using AWS. Articulated vehicles with a pivoting joint for easy turn are difficult to make a sharp turn because of the long body and long wheelbase. Therefore applying AWS to the articulated vehicles is effective to reduce the turning radius. The AWS control method for the articulated vehicles is currently applied to only Phileas vehicles which were developed by APTS. The paper on the design of a controller to guide an articulated vehicle along the path was published but control algorithm for manual driving has not been reported. In the present paper, steering, characteristics of the Phileas vehicles have been analyzed and then new algorithm has been proposed. To verify the AWS algorithm, Commercial S/W, ADAMS was used for validity of the dynamic model and algorithm.

Optimization of a Train Suspension using Kriging Meta-model (크리깅 메타모델에 의한 철도차량 현수장치 최적설계)

  • Lee, Kwang-Ki;Lee, Tae-Hee;Park, Chan-Kyoung
    • Proceedings of the KSME Conference
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    • pp.339-344
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    • 2001
  • In recent engineering, the designer has become more and more dependent on the computer simulations such as FEM (Finite Element Method) and BEM (Boundary Element Method). In order to optimize such implicit models more efficiently and reliably, the meta-modeling technique has been developed for solving such a complex problems combined with the DACE (Design and Analysis of Computer Experiments). It is widely used for exploring the engineer's design space and for building meta-models in order to facilitate an effective solution of multi-objective and multi-disciplinary optimization problems. Optimization of a train suspension is performed according to the minimization of forty-six responses that represent ten ride comforts, twelve derailment quotients, twelve unloading ratios, and twelve stabilities by using the Kriging meta-model of a train suspension. After each Kriging meta-model is constructed, multi-objective optimal solutions are achieved by using a nonlinear programming method called SQP (Sequential Quadratic Programming).

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Study of Effect of Tractive Force on Bicycle Self-Stability (구동력을 고려한 자전거 안정성에 관한 연구)

  • Souh, Byung-Yil
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.11
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    • pp.1319-1326
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    • 2012
  • This study focuses on the influence of tractive forces on the self-stability of a bicycle. The eigen-value analysis of the self-stability of a passive rider control linear bicycle model can be used to analyze the self-stability. A linear bicycle model with front and rear driving forces is developed. The influence of tractive forces on the self-stability is identified by using the developed model. A nonlinear multi-body bicycle model is used to confirm the results of the linear analysis.

On the System Development for the railway vehicle dynamic analysis based on integrated process environments (프로세스 통합 환경 기반의 철도차량 동역학 해석시스템 구축)

  • Huh Young-Cheol;Han Hyung-Suk;Lee Jae-Kyung;Kim Byung-Hyun
    • Proceedings of the KSR Conference
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    • pp.140-145
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    • 2005
  • The dynamic performances of railway vehicles, such as ride comfort, stability and safety, have the opposite characteristics of response each other according to design changes of suspensions. For this reasons, it is necessary that multidisciplinary engineers join in design processes of the suspensions so as to satisfy the requirements of dynamic performance with design constraints. Sometimes iterative dynamic analyses are required so many times during the design processes. In this paper, the development of integrated process environments and the dynamic analyses of railway vehicles based on the environments are presented. Using agent and wrapping technologies, process managements about the work process and design parameters were set up under the distributed computing environments. Also, dynamic analyses on the sample railway vehicle were carried out and the efficiency and improvement in future work were discussed as results.

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Dynamic Analysis of a Bogie Tilting Mechanism (대차 틸팅 기구의 동적 해석)

  • 구동회;김남포;한형석
    • Journal of the Korean Society for Railway
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    • v.6 no.4
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    • pp.300-307
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    • 2003
  • Using a conventional railway, a tilting train was applied as a means of improving vehicle speed curve negotiation without any modification of infrastructure. In order to achieve the optimal car-body position control through the tilting mechanism, a dynamics analysis was required after the kinematics analysis of the tilting mechanism. For this, the geometric relationship of the linkage-type tilting mechanism was defined. Then, the equations of motion for the half car-body were derived. With the derived equations, the effect of the parameter change on performance was analyzed. The analysis result can be used in the optimum design of a tilting mechanism that considers the track environment, vehicle and operational conditions in which the tilting vehicle is applied.

Study on 3-D Simulation for Overriding Evaluation of Urban Train (도시철도차량 타고오름 평가를 위한 3 차원 충돌시뮬레이션 기법 연구)

  • Jin, Sung Zu;Jung, Hyun Seung;Kwon, Tae Soo;Kim, Jin Sung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.39 no.10
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    • pp.1063-1068
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    • 2015
  • In this paper, we propose a collision simulation technique the evaluation of urban trains. We perform simulation that include a dynamics bogie model which represents the dynamic behavior of bogies and a finite-element model that can model crash behavior. We perform simulation in accordance with the 40-mm vertical offset head-on scenario for overriding the evaluation of the EU and domestic crashworthiness regulations. We evaluate the overriding by the vertical displacement of the wheelset using the overriding evaluation standard. Finally, if proposed simulation technique is applied, we can evaluate the overriding for urban-train crashworthiness regulations.

The Development of Program for Time Domain Simulation of Railway Dynamics (철도차량 동역학의 시간영역 시뮬레이션 프로그램 개발)

  • No, Chang-Su
    • 한국기계연구소 소보
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    • pp.87-97
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    • 1988
  • The algorithm for relation of contact status, track shift, and contact force caused from wheel/rail contact geometry is presented. Grafting this algorithm into a algorithm of general program analyzing mechanical system, the program for time domain simulation of railway vehicle dynamics, called CASOTD, was developed. In addition, as applied example of CASOTD, the dynamic simulation of railway vehicle running on a rail joint and a irregularly alinemented rail is done in this paper.

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A Study of Running Safety According to the Section Shape of an F10/F12 Turnout (F10/F12 분기기에서의 단면 형상별 주행안전성 연구)

  • Kim, Sung-Jong;Eom, Beom-Gyu;Kang, Bu-Byoung;Lee, Hi-Sung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.6
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    • pp.591-598
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    • 2011
  • When a vehicle passes through a turnout, it is necessary for the changes in lateral force to be minimized to ensure the safe running of the vehicle. Therefore, the analysis of the interaction between the vehicle and the turnout is crucial for estimating the lateral force and the derailment coefficient on the turnout. In this paper, the effect of the variation of section shape on the running safety of a vehicle was investigated by changing the shape of the point part and the crossing part. The tongue rail length of the point part and nose rail height of the crossing part of an F10/F12 turnout were changed, and the running safety of the vehicle was analyzed.

Levitation Control Simulation of a Maglev Vehicle Considering Guideway Flexibility (가이드웨이 유연성이 고려된 자기부상열차 부상제어 시뮬레이션)

  • Han, Jong-Boo;Lim, Jaewon;Kim, Chang-Hyun;Han, Hyung-Suk;Kim, Sung-Soo
    • Journal of the Korean Society for Railway
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    • v.18 no.1
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    • pp.15-24
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    • 2015
  • In magnetic levitation vehicles, the clearance between the magnet and track should be maintained within an allowable range through a feedback control loop. The flexibility of the guideway would introduce additional modes in the overall suspension system, resulting in dynamic interaction between the guideway vibration and the electromagnetic suspension control system. This dynamic interaction can be a serious problem, particularly at very low speeds or standstill, and may cause airgap instability. To optimize the overall system dynamics, an integrated dynamic model including mechanical and electrical parts and a flexible guideway as well as a control loop was developed. With the proposed model, airgap simulations at standstill were performed while varying the control gains, specifically with the aim of understanding the effects of gains of the PID controller on the airgap variation. The findings may be used to achieve a stable levitation controller design.

A Study on Evaluation Method of Ride Comfort Considering Superimposition of Vertical and Horizontal Curve (종곡선과 평면곡선 경합을 고려한 승차감 평가기법에 관한 연구)

  • Um, Ju-Hwan;Yang, Sin-Chu;Kim, Eun-Kyum;Choi, Il-Yoon;Kang, Yun-Suk
    • Journal of the Korean Society for Railway
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    • v.13 no.3
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    • pp.309-316
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    • 2010
  • When the horizontal and vertical curves are superimposed in railway alignments, which affects the running stability, ride comfort, and track maintenance costs. However, when designing new lines or realigning existing ones, there are many cases of superimposition caused by the existing fixed points (bridge, tunnel, turnout, and catenary system, etc) on the conventional lines and undesirable impacts on the environment, etc. In this study, when the horizontal and vertical curves are superimposed, in order to optimize the horizontal curve in aspect of the ride comfort, the object function was developed and verified by vehicle dynamic analysis. Also, the solution algorithm for simplified evaluation method was presented.