신형 고출력 전기기관차의 곡선추종성 및 주행안전성 평가

함영삼(Young Sam Ham) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.6

본 논문에서는 횡압으로 곡선추종성을 판단하였고, 주행안전성은 윤중감소율 및 윤중과 횡압의 비율인 탈선계수로 평가하였다. 고출력 신형 전기기관차의 곡선추종성 및 주행안전성 평가한 결과, 탈선계수는 시험축이 열차의 앞쪽에 위치할 때가 뒤쪽에 위치할 때보다 크게 나타났으며, 탈선계수의 최대값은 경부선 상행선에서 0.572로 나타났다. 횡압은 곡선 선로가 많은 구간에서 크게 발생하여 주행속도보다는 곡선반경에 비례하는 것으로 나타났으며, 최대 축당 횡압은 태백선에서 77.6 kN 까지 발생하였다. 윤중감소율은 영동선에서 47.6 %까지 발생하였다. 최고속도에서의 주행안전성과 최소곡선반경에서의 곡선통과성능이 요구하는 기준을 만족하였다. In this study, curve responsiveness was assessed based on the lateral force and running safety was evaluated based on the wheel unloading ratio and derailment coefficient, which is the ratio of the wheel load and the lateral force. The evaluation of the curving performance and running safety of the new high-power electric locomotive showed that the derailment coefficient appeared higher when the wheel-set was set to the front of the train instead of being placed backward, and the maximum value of the derailment coefficient was recorded as 0.572 on the Gyeongbu line. Furthermore, the lateral force increased in curved sections, and it appeared to be proportional to the curve radius. Meanwhile, a maximum axis lateral force of 77.6 kN was recorded on the Taebaek line, and the wheel unloading ratio was 47.6% on the Yeongdong line. Finally, the running safety at the maximum speed as well as the through-curve performance of the curve radius satisfied the required standards.

신개념의 레일ㆍ차륜간 접촉력 측정에 관한 연구

홍용기(Yong Ki Hong),유원희(Won Hee You),이희성(Hi Sung Lee) 한국철도학회 2007 한국철도학회논문집 Vol.10 No.6

탈선은 차륜 플렌지가 레일에 접촉할 때 발생하는 횡방향의 힘이 커져 차륜이 레일을 이탈하는 현상이다. 탈선 또는 주행안전도를 평가하는 대표적인 기준은 탈선계수이다. 차륜에 스트레인게이지를 부착하여 탈선계수를 측정하는 기존방법은 대단히 복잡하고 측정의 실패확률도 높으며, 고도의 측정기술과 고가의 비용이 요구되고 있다. 따라서 안전성확인이 필요한 그 시점에 즉시 확인하지 못하고 있어 안전확보에 어려움을 겪고 있다. 본 논문에서는 차륜과 레일간의 접촉력인 윤중과 횡압을 쉽게 측정할 수 있는 방안을 집중적으로 연구하였으며, 가속도과 변위의 거동만으로 탈선 가능성을 예측할 수 있는 새로운 탈선계수 측정방법을 제시하였다. The derailment is defined as phenomena in which the wheels run off the rail due to inordinate lateral force generated when wheel flange contacts with the rail. Derailment coefficient is typical standard assessing running safety and derailment. The traditional method measuring by strain gage adhered to wheels is very complicated and easy to fail. It also requires too much cost and higher measurement technique. Therefore it can hardly ensure safety because we can't confirm at which time we need to identify safety. In this paper, we principally researched the method measuring easily wheel load generated by contacts between wheel flange and the rail, and lateral force. Correlation of vibration and displacement which was related physical amounts of wheel load and lateral force, was investigated and analyzed through analysis, experiment and measurement. And it is presents new measurement method of derailment coefficient which can estimate derailment possibility only by movement of vibration and displacement, by which we understand the rate for acceleration and displacement to contribute wheel load and lateral force and compare actual data of wheel load and lateral force measured from wheel.

철도차량 차축의 굽힘하중에 의한 차륜/레일 접촉력 계산에 관한 연구

함영삼(Young-Sam Ham) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11

The important factor to evaluate the running safety of a railway vehicle would be the interaction force between wheel and rail(derailment coefficient), for which is one of important factors to check the running safety of a railway vehicle that may cause a tragic accident. Element that analyze derailment coefficient is consisted of wheel load and lateral force. In this paper, studied about method that calculate vertical force(wheel load) by bending load of axle in rolling stocks.

철도차량의 주행속도와 윤중감소에 관한 연구

함영삼(Young-Sam Ham) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11

When a vehicle is running, wheel is generating vertical and horizontal force on the rail, in addition to load of vehicle, through a complicated set of motions. The derailment coefficient refers to the ratio of horizontal force(Lateral force) to vertical force (Wheel load), and if the value exceeds a certain level, a wheel climbs or jumps over the rail. That's why the value is used as a criterion for running safety. Wheel load reduction of rolling stocks is less dangerous relatively compared to increase of lateral force. But, because we handle luster indifferently, difficult by wheel load reduction often happens. In this paper, examined about speed of vehicles and wheel unloading ratio differently at high speed.

열차의 운동 특성이 분기기 선형에 미치는 영향 연구

김인재(In-Jae Kim),최유복(You-Bok Choi),김연국(Yeon-Guk Kim) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월

A turnout comprises of complicated components, which results in various structural constraints. As such, it contributes significantly to determining a speed objective for railway system during the passage of a train through a turnout. Thus an intensive review on turnout alignment and its improvements should be conducted at the beginning of the design phase in order to achieve an enhanced permissible speed in diverted track. In particular, I have assessed the impact of the dynamic characteristics of a train such as lateral acceleration, the continuous and discontinuous changes of the lateral acceleration on the turnout alignment.

차륜과 레일 사이에서 발생하는 틸팅차량의 작용력 측정시스템

함영삼(Young-Sam Ham) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11

The important factor to evaluate the running safety of a railway vehicle would be the interaction force between wheel and rail(derailment coefficient), for which is one of important factors to check the running safety of a railway vehicle that may cause a tragic accident. In this paper, proposed system that measure tilting vehicles interaction force that happen between wheel and rail. Because position that measure interaction force is power car, wheel disk has been selected. Therefore, proposed telemeter of non-wire by means that pass signal from rotation body to fixed body.

광주도시철도 전동차의 곡선추종성 및 주행안전성 평가

함영삼(Young-Sam Ham),오택열(Taek-Yul Oh) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4

For the safety of railway, it should be evaluated for the running safety by measuring the derailment coefficient. Although railway has run the fixed and maintained rail, some of railway is derailed. This report shows the results that performed the static load test, wheelset manufacturing for test, main line running test on the basis of the derailment theory and experience. It is executed main line test into more than 80km/h for estimating the curving performance and running safety of Gwangju EMU. Asthe test results, could confirm the curving performance and running safety of Gwangju EMU from the results of the wheel unloading, lateral force, derailment coefficient etc. Derailment coefficient was less than 0.8, and lateral force allowance limit and wheel load reduction ratio were enough safe.

철도차량의 곡선추종성 및 주행안전성 평가

오택열,함영삼 경희대학교 산학협력기술연구원 2005 산학협력기술연구논문집 Vol.11 No.3

For the safety of railway, it should be evaluated for the running safety by measuring the derailment coefficient. Although railway has run the fixed and maintained rail, some of railway is derailed. This report shows the results that performed the static load test, wheelset manufacturing for test, main line running test on the basis of the derailment theory and experience. It is executed main line test into more than 80km/h for estimating the curving performance and running safety of Gwangju EMU. As the test results, could confirm the curving performance and running safety of Gwangju EMU from the results of the wheel unloading, lateral force, derailment coefficient etc. Derailment coefficient was less than 0.8, and lateral force allowance limit and wheel load reduction ratio were enough safe.

화물수송용 스윙모션보기의 임계속도와 주행성능 평가

함영삼,오택열 한국철도학회 2003 한국철도학회논문집 Vol.6 No.4

In this paper the dynamic characteristics of a Swing Motion Bogie, such as a critical speed and a carbody vibration, are investigated in reply to the request of the Meridian Rail Corporation in the United States. Also described are experimental results of the maximum speed, the derailment coefficient, the lateral force, the vertical force, the vibration acceleration and steady state lateral acceleration measured from main line tests.

화물수송용 스윙모션보기의 임계속도와 주행성능 평가

함영삼(Young-Sam Ham),오택열(Taek-Yul Oh) 한국철도학회 2003 철도저널 Vol.6 No.4

In this paper the dynamic characteristics of a Swing Motion Bogie, such as a critical speed and a carbody vibration, are investigated in reply to the request of the Meridian Rail Corporation in the United States. Also described are experimental results of the maximum speed, the derailment coefficient, the lateral force, the vertical force, the vibration acceleration and steady state lateral acceleration measured from main line tests.