• Transactions of the Korean Society of Mechanical Engineers A
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• v.33 no.10
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• pp.1005-1013
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• 2009

In this paper, the performance improvement of a decentralized brake system for railway rolling stocks is investigated. In order to verify the effectiveness of the decentralized brake system, it is compared to the truck unit brake system which has only one control unit per a truck. The adaptive sliding mode control scheme is used to realize a robust anti-slip brake control system. Through computer simulations, it is verified that the decentralized brake system has better braking performance than the truck unit brake system.

• 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.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2002.11b
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• pp.98-103
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• 2002

In this paper, static analysis of eddy current brake's frame, which is one of key structural components of brake system for high speed train, was performed in order to evaluate the design by computer simulation. Calculation was carried out in general for the driving modes 'braking' and 'frame in upper position(Brakes inactive)'. Several yield stress load cases and fatigue load cases were analysed for each of the driving modes. The fatigue load resulting from the Multi Body System simulation was also taken into consideration. The simulation results shows that some of structural part should be improved for more increasing reliability of frame.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.33 no.11
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• pp.1294-1299
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• 2009

The Korean tilting train called Hanvit 200 was launched recently in Korea to improve train speed up to 200 km/h at conventional lines. In this paper, we propose a HILS system for simulations of mechanical braking of the Hanvit 200 train using actual ASCU, actual dump valves, Simulink, dSPACE board, and ControlDesk software. In the proposed HILS system, dynamics of wheelsets, bogies and car body, brake force generation, creep force generations are realized via mathematical models, and anti-skid logic is realized using actual components. The validity of the proposed HILS system is demonstrated via comparing results of real-time and off-line simulations.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2002.11a
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• pp.317.1-317
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• 2002

In this paper, static analysis of eddy current brake′s frame, which is one of key structural components of brake system for high speed train, was performed in order to evaluate the design by computer simulation. Calculation was carried out in general for the driving modes "braking" and "frame in upper position(brakes inactive)". Several yield stress load cases and fatigue load cases were analysed fur each of the driving modes. (omitted)

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1603-1604
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• 2015

ECB(Eddy Current Brake)는 철도시스템의 고속에서 제동력을 안정적으로 나타낼 수 있어서 TGV, ICE, JR-500등과 같은 철도에서 사용되고 있다. 하지만 저속에서는 효율적이지 못하고, 전자석은 경량성에 대한 문제와 에너지를 소비한다는 단점을 가지고 있다. 이 논문에서는 제안된 영구자석형 Shield moving형 와전류 제동기를 사용하였다. 이 와전류 제동기는 Shield의 각을 이동하여 제동력을 조절할 수 있으며 영구자석을 이용함으로서 전자석의 단점을 보안하였다. 하지만 영구자석은 온도에 대해 영향을 받을 수 있으므로 온도 특성은 전류밀도(J(A/m2))와 자속밀도(T)를 'Ansoft Maxell'을 시뮬레이션하여 확인하였다.

• Journal of the KSME
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• v.32 no.10
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• pp.847-857
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• 1992

일반적으로 자동차의 샤시(chassis)라 하면 총체적인 개념에서 자동차로부터 차체(body)를 제외한 부분을 일컫는데, 구동 및 제동장치, 바퀴 현가장치, 조향장치, 타이어 및 휠 등이 이에 속한다. 1970년대 마이크로 컴퓨터의 응용기술이 도입되면서 엔진분야에서 시작한 자동차 전자화기술은 구동 및 제동분야에서의 전자제어식 제동잠김 및 구동 미끄럼방지 시스템(ABS/TCS)의 응용기 술을 거쳐 1980년 중반부터 차량의 현가 및 조향분야에서 능동형의 시스템이 개발되기 시작하 였다. 그 대표적인 예로서 자동차용 적응식 및 반 능동식 가변댐퍼(variable damper), 능동식 현가시스템(active suspension system) 그리고 4륜조향 시스템(four wheel steering system)을 들 수 있다. 1990년대에 들어서는 이러한 각종 능동형 시스템이 종합적으로 고려되어 설계되는 이 른바 자동차의 샤시 통합제어 시스템(chassis integrated control system)또는 능동형 샤시 시스템 (active chassis system)으로 발전되어 가고 있는 추세에 있다. 이 글에서는 최근에 가장 대표 적인 능동형 샤시시스템으로서 각종 능동식 현가시스템 및 4륜조향 시스템의 개발동향 및 기 술적, 경제적인 측면에서의 종합적인 검토를 하고자 한다.

• Proceedings of the KSME Conference
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• 2000.11a
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• pp.87-92
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• 2000

In this paper, we investigated the braking performance of a composite brake shoe for power car. Laboratory bench test and field tests were carried out to characterize the braking performance by the parameters such as friction coefficient, wear rate, braking temperature and stopping distance. Density distribution was found to have a significant influence on the wear rate. The composite brake shoe with even density distribution showed better braking performance. The braking performance of a composite brake shoe was also compared with that of a cast iron brake shoe which is currently being used. The result indicated the performance of the composite brake shoe is better than the cast iron brake shoe.

• Proceedings of the KSME Conference
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• 2000.04b
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• pp.593-598
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• 2000

Experimental study is conducted to clarify the pneumatic characteristics of brake system for freight train. Empty-load and diaphragm brake systems are mainly installed in the freight trains owned by KNR(Korean National Railroad). Experimental train set is composed of sixteen freight train and one diesel locomotive that are now in use. From the experimental results, in case of commercial brake, empty-load brake system responds to the brake command more slowly than the diaphragm brake system. But, in case of release command, the response time of diaphragm brake system is shorter than that of empty-load one. In the emergency brake test, the decreasing rate of brake pipe pressure of tenth car is almost same that of decreasing rate of commercial brake service.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.25 no.12
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• pp.1739-1747
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• 2001

Experimental study has been conducted to clarify the pneumatic characteristics of brake system for freight train and enhance the performance of diaphragm valve. Empty-load and diaphragm valves are installed in pneumatic brake system for freight trains of KNR (Korean National Railroad). Experiments are conducted by using freight train and diesel locomotive in operation. From the experimental results. new quick release valve shortens release time after brake application. In case of normal brake application, the release time is shortened to 34% of the original diaphragm valve. Reducing the release time of pneumatic brake system will be helpful to assure brake-release application and save maintenance efforts like wheel grinding.