• 대한기계학회논문집A
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• 제33권2호
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• pp.169-178
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• 2009

The presence of low adhesion at the wheel-rail contact point can result in skid of train wheels, and the skid, in turn, results in flats appearing on the wheels. Thus, anti-skid control has a crucial role for safe braking and prevention from flats that could cause a disastrous train accident. This paper presents dynamic modeling of a tilting train and the brake system of the tilting train, and analyzes the anti-skid logic used in the tilting train. The validity of the analysis is demonstrated via simulation study using Simulink for skid and re-adhesion circumstances of the tilting train.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1996년도 봄 학술발표회 논문집
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• pp.216-224
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• 1996

Recently, Korea Highway Corporation has attemped to improve the highway safety in accordance with minimizing user's imconveniences. Currently, the Anti Skidding Pavement(ASP) has been introduced as a safety countermeasure on the safety frailty sections. In this study, a series of field evaluations on pavement skid resistance have been conducted on the skid frailty sections to analyze the effects and problems of the Anti Skidding Pavement (ASP), and to understand the behavior of pavement skid resistance due to pavement type, section characteristics, vehicles' speed and traffec volume. Test results show the Anti Skidding Pavement (ASP) has the effects to induce vehicles' speed reduction. However, there are no effects to increase skid resistance. According to these results, it is demanded to improve the applying method of current Anti Skidding Pavement (ASP) to devise an effective safety countermeasure for pavement skid, and to increase pavement skid resistance.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.1276-1281
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• 2006

In general, the wheel-skid prevention of braking system is very important in modern railway applications. This is because wheel-skid can lead to an increase in noise and vibration from wheels with flat points, as well as an increased braking distance. However conventional anti-skid control has problems because wheel adhension and skid characteristics are very difficult nonlinear systems and time consuming to accurately model. In this paper, we design a fuzzy controller using a model of relation between ahdension and braking force, we show that anti-skid fuzzy controller has a very good performance, performing better than the previous conventional controller.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.423-427
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• 2003

In this paper, it is to development of brake system with ABS function for aircraft. The test of brake system is required before applying on aircraft. The real-time dynamic simulator with 5-D.O.F. aircraft dynamic model is developed for braking performance test of ABS (Anti-skid Brake System) control h/w with anti-skid brake functions. The dynamic simulator is real-time interface system that is composed of dynamic simulation parts, master control parts, digital and analog in/out interface parts, and user interface parts. The 5-D.O.F. aircraft dynamic model is composed of a big contour and a little contour by simulation s/w. The big contour represents the interactions of forces in airframe, nose and main landing gear, and engines on the center of gravity. The little contour represents interactions of wheel, braking units, hydraulic units and a control unit. ABS control h/w unit with ABS control algorithm is also developed and is tested with simulator under the some conditions of gripping coefficient. We have known that ABS control h/w unit on wet or snowy runway as well as dry runway very well protects wheel skid.

• 대한기계학회논문집A
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• 제35권1호
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• pp.85-90
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• 2011

철도차량에서 활주방지제어장치를 포함한 제동 시스템을 이해하는 것은 안전과 철도차량의 운영을 위하여 매우 중요한 요소이다. 본 논문에서는 실제 철도차량에 장착되어 있는 활주방지제어장치와 동역학 모델이 포함되어 있는 HILS 시스템을 이용하여 한빛 200 의 활주현상을 해석하였다. 활주를 발생시키기 위해 Simulink 를 이용하여 프로그램 하였고,결과를 확인하기 위한 GUI 프로그램은 dSPACE 사에서 제공하는 ControlDesk 를 이용하였다.

• 한국구조물진단유지관리공학회 논문집
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• 제25권2호
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• pp.58-65
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• 2021

도로의 유지관리 방안으로 미끄럼 방지포장에 대한 시공사례가 급증하고 있다. 패턴 프레임 공법은 도로 표면에 신재료를 추가하는 방식으로 미끄럼 저항 성능향상과 함께 미관을 향상시킬 수 있는 장점을 지니고 있다. 하지만 시공되고 있는 패턴 프레임 공법은 수입산 소재에 의존하고 있으며, 수출규제로 인한 중요소재수급에도 문제를 보이고 있다.. 본 논문에서는 국내형 패턴 프레임 공법 개발을 위하여 사용되는 중요소재를 국산화 하고 개발 공법에 대한 중요지표 성능 검증을 진행하였다. 중요 성능 지표는 언더코팅 소재의 부착강도, 시공 완료된 패턴 프레임의 미끄럼 저항 성능이다. 부착강도는 1.4MPa를 목표로 진행하였으며 국산화 대체 소재는 2.35MPa로 목표 성능을 만족하였고, 미끄럼 저항 성능은 40BPN을 목표로 진행하였으며 국산화 대체 소재는 75BPN으로 목표 성능을 만족하였다. 경제성 분석 결과, 국산화 소재의 경우 패턴 프레임 전 공정에 사용되는 재료비가 1m² 기준으로 해외 소재 대비 40% 절감되는 것을 확인하였다. 추가적으로 현장 시범 시공 및 관련 지표 모니터링을 통하여 개발 공법을 검증완료 하였다.

• 대한기계학회논문집A
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• 제27권10호
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• pp.1615-1622
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• 2003

Being contacted directly with. ground, the tire tread part is in shape of complex patterns of variable ASDs(anti-skid depth) to satisfy various tire performances. However, owing to the painstaking mesh generation job and the extremely long CPU-time, conventional 3-D tire analyses have been performed by either neglecting tread pattern or modeling circumferential grooves only. As a result, such simplified analysis models lead to considerably poor numerical expectations. This paper addresses the development of a 3-D tire mesh generation considering the detailed tread pattern and shows that the contact pressure and frictional energy distribution of tires considering the detailed pattern become better than those by the simplified tire model.

• 대한기계학회논문집A
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• 제33권11호
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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.

• Journal of Electrical Engineering and Technology
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• 제9권1호
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• pp.214-230
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• 2014

This paper presents a high performance sensor less control four motorized wheels for electric vehicle. Firstly, we applied a sensor less master-slave DTC based control to both the two in wheel motors by using sliding mode observer for its quick response and its high reliability in electric vehicle application. Secondly, to overcome the possible loss of adherence of one of the four wheels which is likely to destabilize the vehicle a solution is proposed in this paper. Thirdly, a Fuzzy logic anti-skid control structure well adapted to the non-linear system is used to overcome the main problem of power train system in the wheel road adhesion characteristic. Various Simulation results have been include in this paper to show that the proposed control strategy can prevent vehicle sliding and show good vehicle stability on a curved path.

• 유공압시스템학회:학술대회논문집
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• 유공압시스템학회 2010년도 춘계학술대회
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• pp.93-97
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• 2010

Wheel skids may occur during train operations due to low adhesion at the wheel-rail contact point abnormally, and the skids, in turn, result in flats appearing on the wheels, which affect safety and ride comfort significantly. Thus, anti-skid control has a crucial role for safe braking and prevention from flats that could cause a disastrous train accident. This paper presents simulation studies on an anti-skid control unit (ASCU) with a brake system of a rolling stock including a pneumatic model for brake power supply and dump valve operation.