• Title/Summary/Keyword: Braking Deceleration

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A Study on Velocity-Brake Force Resulted from Deceleration Signal (감속도 신호에 의한 속도-제동력 고찰)

  • Lee, U-Dong
    • Proceedings of the KIEE Conference
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    • 2003.11c
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    • pp.616-620
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    • 2003
  • Brake action is important in train operation. In case of diesel motor cas, coachs and wagon, the brake system is only act on the stop of train, but it is emphasis on safety and convenience in urban transit system such as EMU, subwar, AGT, etc. Brake of EMU has two types. one is called service brake that is used at normal operation. The other is called emergency brake. it is used at emergency operation. Service brake bring a EMU to a halt through a blending brake that form electronic brake and frictional brake. Generally EMU compose motor car and trailer car. Blending brake bring a EMU to a halt through a blending brake that form electronic brake of motor car and frictional brake of trailer car. Blending braking technology have different characteristics each nations or manufacturing companies. but deceleration command that is parameter decide blending brake. According to deceleration command, electronic brake and frictional brake are applied differently So braking power is different. electronic brake and frictional brake must be used appropriately as deceleration command. Also braking facilities must be stopped EMU more economically and safely through revision of algorism about blending brake according to output diagram. Thus The purpose of paper is to propose blending braking control way as consideration of braking output diagram used deceleration command that influence blending brake of EMU.

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A Simulation Program for the Braking Characteristics of Tractor-Semitrailer Vehicle (Tractor-Semitrailer 차량의 제동특성 프로그램 개발)

  • 서명원;박윤기;권성진;양승환;박병철
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.2
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    • pp.152-167
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    • 2001
  • Recently safety systems for the commercial vehicle have been rapidly developed. However, we still have many problems in the vehicle stability and the braking performance. Especially, a commercial vehicle may meet a dangerous braking condition when the vehicle is lightly loaded or empty and when the road is wet or slippery. Under these conditions, the truck can spin out or the tractor can jackknife or the trailer can swing out. To design the air brake system for the commercial vehicle, since the air brake system has many design variables, there must have been intensive researches on a method how to prevent dynamic instability and how to maximize the vehicle deceleration. In this study, mathematical models about the tractor-semitrailer and the air brake system including an ABS controller have been constructed for computer simulation. Also, simple examples are applied to show the usefulness of the program. Designers can use this simulation program for understanding the braking characteristics such as trajectory, braking distance, longitudinal deceleration, lateral deceleration, and yaw rate on various road conditions.

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A Study of Rail Wear by Change of Acceleration and Deceleration (가속도/감속도 변화율에 따른 레일마모 현상에 관한 연구)

  • Ha, Kwan-Yong;Kim, Hie-Sik
    • Journal of the Korean Society for Railway
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    • v.10 no.5
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    • pp.607-612
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    • 2007
  • In this paper, operation mode of train was divided into powering, coasting, and braking and rail wear phenomenon has been done comparative analysis by each section. Data of train velocity is transferred to acceleration and deceleration from ATO Logging data. Amount of rail wear has been done comparative analysis by traction force of acceleration and braking force of deceleration and a plan for management of track irregularity is come up with by the result of the analysis.

A Technique Study for Improve the Precise Position Stopping of Automatic Train Operation (ATO) Train Vehicle in Urban Railway (도시철도 자동운전 차량의 정밀정차 향상을 위한 기법 연구)

  • Ma, Sang-Kyeon;Heo, Dae-Jeung;Kim, Myung-Hwan;Song, Jae-Cheong;Park, Jun-Ho
    • Proceedings of the KSR Conference
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    • 2011.10a
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    • pp.1049-1058
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    • 2011
  • This paper suggests blending time adjusting method of braking command characteristics management and Set value test for optimizing of braking deceleration to enhance the precise position stopping. This method minimizes pneumatic-braking degree deviation by characteristics management, and secures braking stability at braking. By Set value test method, braking blending characteristics are analyzed accurately. And by optimal timing tuning at braking blending, It enhanced the precise position stopping with stabilization of deceleration To demonstrate the usefulness of these suggestion, I modeled for Deajeon Line #1. And through comparison with case of related companies, the proposed method which this paper suggested is proved to be superior to others.

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A Study on the Braking Characteristics of Control Methods for ABS mounted Vehicle (ABS 장착 자동차의 제어방식에 따른 제동특성에 관한 연구)

  • Choi, Jong-Hwan;Kim, Wung-Su;Yang, Soon-Yong;Park, Sung-Tae;Lee, Jin-Kul
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.8
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    • pp.203-211
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    • 2002
  • ABS (Anti-lock Braking System) is a safety device for preventing wheel locking in a sudden braking. It consists of hydraulic modulator, ECU(Electronic Control Unit) and angular velocity sensors. Its control methods are classified into three types; deceleration control, slip ratio control and deceleration/acceleration control. In this paper, ABS mounted vehicle is mathematically modeled and the proposed model is verified by actual cars experiments, and the braking characteristics of the control methods with pulse width modulation are compared and analyzed through computer simulations.

Study on the Deduction of Traction/Braking Forces for the Train from Acceleration/Deceleration (가속도/감속도를 이용한 열차 견인력/제동력 추정방법에 대한 고찰)

  • Kim, Seog-Won;Kim, Ki-Hwan;Mok, Jin-Yong;Kim, Young-Guk
    • Journal of the Korean Society for Railway
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    • v.9 no.6 s.37
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    • pp.682-688
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    • 2006
  • In this paper, a method which can deduce the traction farce or the braking force from the acceleration or the deceleration of the train, has been suggested. In the case of Korean high speed train (HSR-350x), the traction force and the braking forces have been obtained by using this method. It is proven that the proposed method is a very good tool in estimating the traction force or the braking force when the train starts or stops. Also, these forces on be used to calculate friction coefficients of mechanical brakes and the transmission efficiency of the traction system.

A Simulation Program for the Braking Characteristics of 8$\times$4 Vehicles (8$\times$4 차량의 제동특성 시뮬레이션 프로그램 개발)

  • 서명원;박윤기;권성진
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.6
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    • pp.119-128
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    • 2001
  • Recently safety systems for the commercial vehicle have been rapidly developed. However, we still have many problems in the vehicle stability and the braking performance. Especially, a commercial vehicle may meet a dangerous braking condition when the vehicle is lightly loaded or empty and the road is wet or slippery. To design the air brake system for commercial vehicles, since the air brake system has many design variables, there must have been intensive researches on a method how to prevent dynamic instability and how to maximize the vehicle deceleration. In this study, mathematical models about an 8$\times$4 vehicle and an air brake system including an ABS controller have been constructed for computer simulation. Also, simple examples are applied to show the usefulness of the computer program. Designers can use this simulation program for understanding the braking characteristics of 8$\times$4 commercial vehicles such as trajectory, braking distance, longitudinal deceleration, lateral deceleration, and yaw rate on various road conditions.

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A Study on Train Braking Performance Assessment Methods Using Braked Weight Percentage (제동중량비율을 이용한 도시철도차량 제동성능 평가방법 연구)

  • Choi, Don-Bum;Lee, Kang-Mi;Yoon, Yong-Ki
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.11
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    • pp.545-551
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    • 2016
  • In this study, we evaluate the braking performance of an urban railway vehicle to verify its basic safety condition. The braking performance evaluation methods, deceleration measurement and braked weight percentage, were compared for trains with different numbers of cars, in order to assess the advantages of each method and their compatibility. With a probabilistic braking model, the effect of the adhesion coefficient distribution was analyzed in accordance with the train composition. A train with many cars has a narrower deceleration distribution width than one with few cars. The braked weight percentage method is expected to be useful in the design of train signal systems, because it allows the braking distance to be calculated for various initial brake velocities. The deceleration distribution model and its results are expected to be useful as a basis for precise train signal design.

Design of Deceleration Controller for Air Braking System (공기제동 시스템의 감속도 제어기 설계)

  • Lee K. K.;Kim W. K.;Kim M. Y.;Yoon S. C.;Baik K. S.
    • Proceedings of the KSR Conference
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    • 2004.06a
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    • pp.696-701
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    • 2004
  • Electric vehicle that is manufactured present by development of electric vehicle technology were available automatic driving. Control of air breaking system for precision stopping is important at automatic driving. Current Electric vehicle is doing precision stopping using braking force control. Braking force control is difficult to take static deceleration by rail condition or change of friction coefficient. Therefore, Proposed the controller in this study is deceleration controller. Designed controller is a robust controller that take state control characteristic for modelling error.

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A Study of Rail Wear by Change of Train Velocity (철도 차량 속도에 따른 레일 마모 현상에 관한 연구)

  • Ha, Kwan-Yong;Kim, Hei-Sik
    • Proceedings of the KIEE Conference
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    • 2007.10a
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    • pp.299-300
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    • 2007
  • In this paper, slip wear phenomenon of train was studied by traction force of acceleration and braking force of deceleration. First, the slip wear phenomenon on train operation mode was analyzed when powering, coasting and braking each and then rail wear was analyzed from the slip wear data. Especially, the data proved correlation between slip wear and deceleration rather than acceleration. Second, If velocity of a train is constant, even though the velocity is high, ATO logging data and measurement data proved that the rail wear is not serious. It will help for efficient braking force operation providing fundamental data to braking step control.

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