• Title/Summary/Keyword: train dynamic performance

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Performance and Transmission Efficiency Analysis of 2-Mode Hydro Mechanical Transmission (2-모드 기계유압식 무단변속기의 성능 및 전달효율해석)

  • Jung Gyuhong;Kim Hyoungeui;Kim Jongki
    • Transactions of the Korean Society of Automotive Engineers
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    • v.13 no.1
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    • pp.90-98
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    • 2005
  • HMT is a type of continuously variable transmission which has split power flow path characteristics with gear train and hydro static unit. The benefit of improved fuel economy and high power capacity enables it to be a promising application fur large vehicles. This paper presents the analysis results including velocity, static torque, transmission efficiency and dynamic model of the HMT that is developed for city buses. The speeds or gear shafts, the static clutch torque and split power ratio for each mode are detailed here. From the analysis of HMT transmission efficiency considering the power loss in meshed gear and hydraulic unit, we can conclude that minimization of hydraulic power is necessary for improved fuel economy design. Also, the dynamic simulation result for mode shift characteristics shows that little shift shock is observed because of the synchronized rotation speed in clutch.

Analysis of the acceleration of KHST prototype on the high speed test line (한국형 고속전철의 진동가속도 시험 연구)

  • Park Chankyounn;Kim Youngguk;Kim Seogwon
    • Proceedings of the KSR Conference
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    • 2003.05a
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    • pp.567-573
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    • 2003
  • Korean High Speed Train (KHST) has been tested on high speed line in JungBu site since it was developed in 2002. The data acquisition system was developed to accomplish successfully this on-line test for proving the dynamic Performance of KHST. This system was consist of the personal computers based on National Instrument PXI modules and the test programs based on Labview 6i. This paper shows that this system is efficient to acquire the test data through the multi-channels connected the accelerometers which located in long distance places and flexible to change and add channels for data acquisition. The dynamic analysis of an on-line test is very complicate because the environmental conditions, as examples radius of curve, inclination of the track, tunnels, bridges, and so forth, and running conditions, as examples driving, braking, the number of working motors, and so forth, have an effect on the results. Therefor, the analysis method is important and this paper proposes the efficient procedure graphically, showing the proposed method simplify the accelerations of 5th bogie frame acquired during the on-line test for KHST.

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Kinematic Envelope Analysis of the Urban Transit EMU based on PSD Installation (PSD 설치에 따른 도시철도차량의 동적 거동 분석)

  • Chung, Jong-Duk;Ohn, Jung-Ghun;Pyun, Jang-Sik;Park, Jang-Gon;Lee, Jong-Woo
    • Journal of the Korean Society for Railway
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    • v.16 no.6
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    • pp.447-453
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    • 2013
  • Since PSDs(Platform Screen Doors) are set up at many subway stations, their design related to safety has become gradually important. In particular, the interference check with a running railway vehicle is the most important of performance indices because the collision between PSDs and vehicles can be dangerous for passengers in the car and on platforms. When the train comes into a station with a curvature, the passenger car has a large translational and rotational motion and the displacement is enough for coming in contact with PSD. The performance is affected by many design parameters such as rail design parameters and vehicle velocity. This study proposes dynamic analysis models for railway vehicles and rails. Some parameters were also considered in the models to determine their influence on the performance.

A Study on Clutch-disc Torsional Characteristic for aTorsional Vibration Reduction at Idling (공회전시 비틀림진동 저감을 위한 클러치 비틀림 특성 연구)

  • 홍동표;정태진;김상수;태신호
    • Journal of KSNVE
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    • v.4 no.3
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    • pp.319-325
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    • 1994
  • The flucturation of the engine torque appears to be the major source of the torsional vibration of the automotive driveline. The reduction of this torsional vibration has become a significant problem, due to an increase in the flucturation of the torque of recent light weighted powered engines, along with the requirements of higher performance. The torsional vibration of the automotive driveline can be reduced by soothing the fluctuation by adjusting the torsional characteristics of the clutch-disc. Computer simulation of the engine- input gear train is a useful investigative tool on studying the torsional characteristics of the clutch-disc. In this paper, a dynamic model for the automotive driveline was developed, and the engine torque and drag torque of the model were evaluated withe experimental data. By executing a simulation using the model, it has become possible to obtain the clutch-disc torsional characteristics when the engine is idling and the clucth-disc torsional characteristics for reducing the torsional vibration has been suggested.

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The Characteristics of Engine Noise and its Reduction Techniques (엔진 소음, 진동 특성 및 개선방안)

  • 이재갑;여승동
    • Journal of KSNVE
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    • v.7 no.4
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    • pp.689-700
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    • 1997
  • There are many difficulties in designing the engine structure properly due to the strong conflicts between NVH characteristics and the high performance, light weight and low product cost. Many feasible noise reduction techniques should be carefully incorporated to meet such stringent noise requirements. It is also required that the engine development be carried out by introducing concurrent engineering, in which the analysis and test database are usefully applied to the detail designs from the 1st stage. This paper reviews the significance of the noise characteristics of the structure elements in relation to the combustion pressure. The mechanisms of the crank shaft rumbling, which is the main source having the bad influence on the sound quality, are also explained. The influences of dynamic behavior of engine structure on its noise are investigated, followed by discussions on experimental results of the features necessary for the design of low noise engine concepts.

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A Controller Design for the Prediction of Optimal Heating Load (최적 난방부하 예측 제어기 설계)

  • 정기철;양해원
    • Journal of Institute of Control, Robotics and Systems
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    • v.6 no.6
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    • pp.441-446
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    • 2000
  • This paper presents an approach for the prediction of optimal heating load using a diagonal recurrent neural networks(DRNN) and data base system of outdoor temperature. In the DRNN, a dynamic backpropagation(DBP) with delta-bar-delta teaming method is used to train an optimal heating load identifier. And the data base system is utilized for outdoor temperature prediction. Compared to other kinds of methods, the proposed method gives better prediction performance of heating load. Also a hardware for the controller is developed using a microprocessor. The experimental results show that prediction enhancement for heating load can be achieved with the proposed method regardless of the its inherent nonlinearity and large time constant.

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A Study on the Dynamic Characteristics of Railway Rolling Stock Applied Air Aprings (공기스프링 적용 철도차량의 동적 특성에 관한 연구)

  • 허현무;함영삼;최경진;권성태
    • Proceedings of the KSR Conference
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    • 2001.10a
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    • pp.171-178
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    • 2001
  • Air spring for railway rolling-stock is a part of secondary suspension system which play the role of supporting load, damping vibration. Recently, air springs are actively applied to railway rolling-stock to substitute coil spring with upgrading the manufacturing skill. This study is started to get the fundamental datum related to air spring for the purpose of developing the test draft for air spring. To analyze the performance of air spring, we conducted the simulation for railway rolling-stock applied air spring and tested train in convention lines. Thus, we have obtained useful datum to develop the test draft for air spring. Here, we describe some 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.

An Intelligent Control of TRack Vehicle Using Fuzzy-Neural Network Control Method (퍼지-신경회로망 제어기법에 의한 궤도차량의 지능제어)

  • 신행봉;김용태;조길수;한성현
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1999.05a
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    • pp.210-215
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    • 1999
  • In this paper, a new approach to the dynamic control technique for track vehicle system using fuzzy-neural network control technique is proposed. The proposed control scheme uses a Gaussian function as a unit function in the neural network-fuzzy, and back propagation algorithm to train the fuzzy-neural network controller in the framework of the specialized learning architecture. It is proposed a learning controller consisting of two neural network-fuzzy based on independent reasoning and a connection net with fixed weights to simply the neural networks-fuzzy. The performance of the proposed controller is shown by simulation for trajectory tracking of the speed and azimuth of a track vehicle.

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Optimal Design of Reinforced Rail over Connection Section of Bridge and Embankment (교량/토공 접속구간 보강레일의 최적설계)

  • Yang, S.C.;Kang, Y.S.;Kim, E.
    • Proceedings of the KSR Conference
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    • 2002.05a
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    • pp.256-263
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    • 2002
  • This paper deal with optimal design of reinforced track as a track reinforcing method for transition area of track support stiffness in transition area between bridge and earthwork. When vehicle passes through transition area, dynamic properties between vehicle and track are studied by the analysis of vehicle-train interaction for the each case when reinforced tracks are used or not. furthermore, optimum decision of type and length of track are made based on the performance adapting variable parameters : support stiffness of track for bridge and earthwork, heading direction of vehicle and type and length of track.

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