• 자동차안전학회지
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• 제8권3호
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• pp.28-32
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• 2016

Braking system is directly related to the safety of a vehicle and the brake discs are essential part of the braking system. Due to the repeated frictional forces and torque during braking, brake discs are always works at high temperature and high pressure. Furthermore, the brake disc is one of major tuning components in aftermarket, the braking performance of the brake disc should be evaluated for establishing the certification standards of tuning components. This paper proposes the test method to evaluate the performance of tuning brake discs.

• 디지털융복합연구
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• 제13권11호
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• pp.171-178
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• 2015

디스크 커버는 브레이크 디스크 및 캘리퍼를 보호하기 위해 설치하고, 고객에게 인도되기 직전에 제거된다. 본 연구에서 디스크 커버의 온도는 주행 시험 차량(2000cc, 디젤)을 대상으로 측정되었다. 주행 시험(120km/h-제동(0.3G)-정지-120km/h-제동(0.5G)-정지)에서 측정된 최고 온도는 디스크 커버 상부에서 $260{\sim}270^{\circ}C$이었고, 디스크 커버 주위에 상당한 변화를 보였다. 이는 고온 디스크로부터 커버로의 주요 열전달이 대류를 통해서임을 커버 주위의 온도 분포로부터 추론 할 수 있다. 즉, 마찰 제동에 의해 발생된 고온의 공기가 디스크 커버 상부까지 올라간 것이다. 그리고 주행 시험 중에 디스크 커버의 상부 영역만이 용융되었다. 디스크 커버의 두께를 0.7mm부터 1.0mm로 증가시키고, 마스킹 테이프 1장을 디스크 커버 상부 영역에 부착하였다. 그 후에 디스크 커버는 주행 시험 시 마찰 제동에 의해 형성된 고온의 공기에도 변형되지 않았다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 1999년도 춘계학술대회 논문집
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• pp.291-298
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• 1999

TCMS(Train Control ＆ Management System) is the management system of train information which intensively control, monitor and test the main on-board equipments including propulsion/brake unit by the serial transmission line. TCMS reduces interface circuits and number of train lines by the software logic and utilizing serial communication method. This paper describes the method of powering and braking control by TCMS software logic, in comparison with the powering/braking control by conventional relay logic/hardwire circuits, and the software logic was verified by simulation test with TCMS simulator.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.1461-1467
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• 2009

The electric railway is a clean and energy saving system, because it requires relatively less energy than automobiles by transporting the same passengers or goods. Six thousands of vehicles are operated on Korean urban transit system. This system is 95% of regeneration system. Especially, the VVVF-Inverter vehicle has a merit of the highest regeneration rate. Energy consumption is 90% for traction and 10% for auxiliary supply. Braking energy is about 40% of energy consumption. Up to 40% of the tractive power of vehicles capable of returning energy to the power supply can be regenerated during braking and that this energy can be used to feed vehicles which are accelerating at the same time. The energy generated by braking vehicle would simply be converted into waste heat by its braking resistors if no other vehicle is accelerating at exactly the same time. Such synchronized braking and accelerating can not be coordinated, the ESS(energy storage system) stores the energy generated during braking and discharges it again when a vehicle accelerates. This paper presents field tests about the energy saving rate of the developed ESS. when the ESS is on/off, energy saving rate of the ESS is tested. The verification test in the field focused on energy saving.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 추계학술대회 논문집
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• pp.1-5
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• 2005

High-speed trains with maximum speed of 300km/h, named KTX, have started revenue services since April 2004. Is becoming big problem where currently the KTX train because excessive braking noise at a station platform. The KTX braking noise follows in operating mode of KTX train and important railroad station where the quality appears different, the quality against hereupon from the commerce vehicle from the research which it sees it executes and comparison to analyze.

• 한국산학기술학회논문지
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• 제21권9호
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• pp.32-38
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• 2020

화차 제동은 공기 제동관의 압력변화를 이용해 제동 체결과 완해를 반복적으로 작동하여 수행한다. 화차 공기 제동 완해 불량은 기관사의 제동완해 취급 후에 제동 제어밸브의 오작동으로 인해 부분적인 제동체결상태를 의미한다. 이 현상은 화차 주행 동안 차륜 찰상과 열손상을 발생시킴으로서, 차륜파손 또는 열차 탈선사고를 일으킨다. 따라서 화차의 운행 지연 및 사고방지를 위해서는 공기제동 완해불량을 방지하는 체계적인 연구가 중요하다. 이를 해결하기 위하여 본 연구에서는 철도운영기관의 제작과 기능요구사항을 고려하여 완해불량 방지밸브를 개발하였다. 또한 본 밸브의 내구성 시험은 화차제동성능 시뮬레이터 성능시험기를 이용하였으며, 이의 작동성능은 반복적인 제동과 완해불량 조건하에 공압이력으로부터 평가하였다. 본 밸브의 보증수명은 화차 주행동안 제동횟수를 고려하여 무고장 시험기법에 준하여 12개 시제품에 대하여 총 16만회 성능시험을 수행하였다. 내구성 시험동안 본 밸브의 공압 입력 시간과 출력시간 및 출력속도의 차이는 거의 일정하였다. 본 밸브의 보증수명은 신뢰수준 95%에서 59,860회이며, 화차 대차에 본 밸브를 설치할 경우에 요구조건인 4년간 고장없이 운용될 수 있음을 의미한다.

• 자동차안전학회지
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• 제7권2호
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• pp.25-31
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• 2015

This paper presents a performance evaluation procedure for advanced emergency braking (AEB) system. To guarantee the performance of AEB system, AEB test scenario should contains various driving conditions which can be occurred in real driving condition. Also, performances of each elements of AEB system, such as sensor, decision, human machine interface (HMI) and control, should be evaluated in various situations. For this, driving conditions, road types, environment, and elements of AEB system were introduced. Test scenario has been designed to represent the real driving condition and to evaluate the safety performance of AEB system in various situations. To confirm that the proposed AEB test scenario is realistic and physically meaningful, vehicle test have been conducted in two cases of proposed AEB test scenario: subject vehicle cut-out scenario and narrow street turn left scenario.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.554-559
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• 2011

Braking performance of a trainset that consists of a locomotive and several coaches and/or wagons is influenced by that of the locomotive as well as each coach or wagon. For trains to safely travel on a railway, trains must be provided with sufficient distance where to stop. Thus, replacing coaches or wagons needs calculating, measuring the braking performance such as a stopping distance or a deceleration. The task is further complicated if there are many kinds of trains with different braking performance characteristics. The accurate calculation is subject to acquire accurate information on the existing cars. Moreover, the initiation of braking by a driver or the geometry of the track affects as complicated factors. In this paper, based on the braking performance test conducted for US-SCRRA coaches, introduced several factors assumed to influence the result and the compensating methodology.

• 한국항공운항학회지
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• 제25권2호
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• pp.18-24
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• 2017

Results of the experimental research are described in this thesis, which are about braking characteristics of aircraft ABS brake system with different ground conditions. Dynamo-tests were conducted with the state of the application aircraft condition and with two different ground conditions. The Braking characteristics on each ground condition were drawn from the results of occurrence of skid, braking distance and deceleration. The braking performance of the application aircraft could be anticipated and the efficient range of braking operation could be set with those results.

• 한국자동차공학회논문집
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• 제3권3호
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• pp.109-118
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• 1995

This paper presents a mathematical vehicle model to analyze the dynamic characteristics of a vehicle undergoing braking in a turn. Two kinds of field tests, braking in a steady state turn and braking in a J-turn are performed. Computer simulation results are compared with test results and the braking effect on a vehicle cornering behavior is examined. Also, sensitivity analysis is applied to determine the effect of design parameter changes on the response of vehicle dynamic system.