• Title, Summary, Keyword: braking action

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Development of train/bridge interaction Analysis program Consideration braking (열차 제동하중을 고려한 차량/교량 상호 작용 해석기법 개발)

  • Yun hee sub;Kim Man-Cheol;Han sang chel
    • Proceedings of the KSR Conference
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    • pp.1177-1183
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    • 2005
  • This paper presents the effects of dynamic response of the railway bridge through the suspension system when the train is moving with uniform speed and non-uniform speed Railway bridges are subjected to dynamic loads generated by the interaction between moving vehicles and the bridge structures. these dynamic loads result in response fluctuation in bridge members. To investigate the real dynamic behavior of the bridge, a number of analytical and experimental investigation should be carried out. This paper, a train/bridge interaction analysis program considerate braking action. New scheme consideration of braking action on the bridge using speed-dependent braking function is presented. This program also used torsional degree of freedom and constraint equation based on geometrical relationship in order to take into consideration three-dimensional eccentricity effect due to the operation on double track through quasi three-dimensional analysis.

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A Study on Reducing Speed Control of Hydraulic Motor of Textiles Supply Rolling Equipment (섬유공급 롤링장치의 유압모터 감속도 제어에 관한 연구)

  • 이재구;김도태;김성동
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.62-67
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    • 2001
  • The textiles supply rolling equipment is a part of inspection machine which inspect finished textiles and it check up textiles through rolling hydraulic equipment. This study suggests a method to select the capacity and initial gas pressure of accumulator to control reducing speed of the hydraulic motor to a desired degree. An accumulator in hydraulic systems is hydraulic machinery which stores kinetic energy of inertia body during braking. A series of computer simulations were done for the brake action and the selection method was based upon a trial and error approach. The results of the simulation work were compared with those of experiments and these results show that the proposed method can be applied effectively to control reducing speed of the hydraulic motor when braking action in textiles rolling system.

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A Study on Absorption Device of Surge Rising Pressure Occurring when Suddenly Braking Action in the Hydraulic Driving Part of Textiles Let off (섬유송출 유압구동부 급제동시 발생하는 충격상승압 흡수장치에 관한 연구)

  • 이재구;김정현;김도태;김성동;정선환
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.12 no.1
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    • pp.84-91
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    • 2003
  • The equipment of textiles let off is a part of inspection machine which inspects finished textiles and it checks up textiles through that. This study suggests a method to select the capacity and initial gas pressure of accumulator to control surge rising pressure occurring when suddenly braking action to a desired degree. An accumulator in hydraulic systems is by hydraulic machinery which stores kinetic energy of inertia body during braking. A series of computer simulations were done for the brake action The results of the simulation work were compared with those of experiments.

EFFECT OF BRAKE PEDAL IMPEDANCE ON BRAKING PERFORMANCE IN EH-BBW SYSTEM

  • PARK S.
    • International Journal of Automotive Technology
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    • v.6 no.4
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    • pp.391-402
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    • 2005
  • Despite its superior braking performance to conventional vehicles on test tracks, the performance of the ABS-equipped car seems disappointing on real highway. The poor braking performance results from questionable design of the human-machine interface(HMI) of the brake system. Force-displacement relation at the brake pedal has a strong effect on the braking performance. Recently developed brake-by-wire (BBW) system may allow us to tailor the force feel at the brake pedal. This study aims at exploring analytical ways of designing human-machine interface of BBW system. In this paper, mathematical models of brake pedal feel for electro-hydraulic BBW (EH-BBW) system are developed, and the braking motion and the characteristics of the driver's leg action are modeled. Based on the dynamic characteristics of the brake pedal and the driver, two new HMI designs for EH-BBW system are proposed. In the designs, BBW system is modeled as a type of master-slave teleoperator. The effectiveness of the proposed designs is investigated using driving simulation.

A study on electronic braking system using wind power synchronous generator's armature reaction (풍력용 동기발전기의 전기자 반작용을 이용한 전기 제동방식에 관한 연구)

  • Park, Gui-Yeol;Moon, Chae-Joo;Cheang, Eui-Heang;Chang, Yung-Hak;Kim, Eui-Sun
    • Journal of the Korean Solar Energy Society
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    • v.30 no.4
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    • pp.1-8
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    • 2010
  • The mechanical parts of small windp ower generator less than 10kW are manufactured in the form of removing most of the accelerators. The braking system to protect blade from damages caused by high wind speed is manufactured in a manner having apparatus system(furling), manual brake or no brake. This study is on braking system in small size wind power generator, and carried out survey as following steps by applying electric braking system which uses armature reaction. We explained the principle of electric braking system and the principle of existing braking system. Also, this paper interpreted short circuit current through open circuit and short circuit, as well as checking brake system's action using armature reaction with real construction of control device.

Algorithm of intelligent SPS with applying fast-valving and braking resistor (Fast-valving과 Braking resistor 적용을 통한 지능형 SPS 알고리즘 구현)

  • Kim, Kab-Yong;Yoon, Dong-Hee;Jang, Gil-Soo;Moon, Young-Hwan;Kim, Seog-Joo;Seo, Sang-Soo
    • Proceedings of the KIEE Conference
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    • pp.280-281
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    • 2011
  • Special Protection Scheme(SPS) that operates scenarios about faults beyond the normally protective action is wide system protection technology for the purpose of wide areas protection. Therefore, the SPS focuses on the improvement of the power supply capability by protecting the system rather than protecting the system equipments. Since the SPS requires emergency operation, the operation schedule is set up in advance by analyzing various scenarios. Since the SPS's action scheme uses generator tripping and is a classical method it is presently the most powerful one. However, as the setting of SPS is set to the most severe disturbance, the scheme tends to trip more generators than required to prevent fault propagation. It is highly likely that tripping generator units to prevent fault propagation would result in difficulty of system management and possibility of load shedding. Accordingly, it is desirable that generators are connected to the system within the range that ensures system stability and intelligent SPS is currently under development to solve the problem being stated. In this paper, as a part of developing the intelligent SPS, application of the fast-valving and braking resistor scheme to the generators is being proposed and analysed to reduce the number of tripped generators.

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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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    • 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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Characteristic Test of the Electro Mechanical Brake Actuator for Urban Railway Vehicles (도시철도용 전기기계식 제동장치의 특성시험)

  • Kim, Min Soo;Oh, Seh Chan;Kwon, Seok Jin
    • Journal of the Korean Society for Precision Engineering
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    • v.33 no.7
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    • pp.535-540
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    • 2016
  • The braking device in railway vehicles decelerates or stops the train by dissipating the thermal energy converted from kinetic energy into the air. Therefore, the brake system is crucial for safety. In this paper, we performed a study on an electromechanical brake actuator using an electrical motor as an alternative to pneumatic air cylinders to reduce the idle running time in braking, which subsequently increases braking distance, and to ensure reliable response characteristics. Especially, to analyze the response characteristics of the electromechanical brake actuator, we measure the delay time, response time and power consumption compared to the air cylinder. It is confirmed that the electromechanical brake actuator can reduce reaction time by 0.1 seconds (Braking Action) and 0.46 seconds (Brake Release) compared to the air cylinder.

Vibration of Steel Composite Railway Bridges under High Speed Train (고속열차하중 하의 강합성형 철도교의 진동)

  • Chang, Sung Pil;Kwark, Jong Won;Ha, Sang Gil;Kim, Sung Il
    • Journal of Korean Society of Steel Construction
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    • v.10 no.4
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    • pp.577-587
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    • 1998
  • The influences of high speed train on the dynamic responses of steel composite railway bridges are investigated. The bridge system which has two I-girder and several cross beams is modeled with plate and frame elements. With assumption of concrete slabs are fully connected with steel girders, the offset between slabs and girders is modeled using constraint equation. The track system is modeled using beams on elastic foundation theory. And, the TGV train model is developed in 2-dimension considering bouncing and pitching motion. And braking action of vehicle is considered using speed dependent braking function. To investigate the behavior of bridges due to moving trains, parametric studies on the variation of natural frequency of bridge, speed parameter, vehicle modeling method, braking action of train, etc are performed.

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Dynamic Analysis on the Energy Regenerative Brake of Hydraulic Driven Systems (유압 구동계 에너지 제생 브레이크의 동특성 해석)

  • 이재구
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.9 no.4
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    • pp.137-146
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    • 2000
  • The hydraulic energy regnerative brake systems is introduced in this work. An accumulator stores kinetic energy during braking action, and the stored energy is used in a following acceleration action. The dynamic model of the brake system is derived for computer simulation study, and the Runge-Kutta numerical integration method is applied to the simulation work. Since the model contains several unknown parameters, these were determined by data which had been proceeded. Through a series of computer simulation , dynamic performance of the energy regenerative brake system is compared with that of a conventional system in which a conventional brake circuit is used. A series of test is carried out in the laboratory. The dynamic characteristics of the hydraulic motor system, such as the surge pressure and response time, are investigated in both brake action and acceleration action.

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