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허현무(Hyunmoo Hur),이준혁(Junhyuk Lee),서정원(Jungwon Seo),문경호(Kyungho Moon),최종현(Jonghyun Choi) 한국철도학회 2024 한국철도학회논문집 Vol.27 No.3
곡선구간 주행 성능 향상을 위하여 개발한 능동조향대차에 장착된 곡선검지 센서 시제의 곡률 추출 성능을 검증하고자 실선로에서의 현차적용 시험을 수행하였다. 차량 구동형식이 곡률 추출 성능에 미치는 영향을 분석하고자 부수대차 차량과 구동대차 차량을 대상으로 곡률을 측정한 결과, 궤도검측 결과와 비교할 때, 최대 편차는 공차 시 부수차량, 구동차량 모두 3.4%이며 만차 시 부수차량은 1.8%, 구동차량은 2.2% 수준으로 차량 구동형식에 따른 뚜렷한 차이점은 발견되지 않았다. 차량 하중조건이 곡률 추출 성능에 미치는 영향은, 부수대차 차량의 경우, 궤도검측 결과와 편차는 공차 3.4%, 만차 1.8%이며 구동대차 차량의 경우, 공차 3.4%, 만차 2.2%로 매우 미미한 수준이다. 따라서 능동조향대차 곡선검지 센서의 곡률 추출 성능은 차량 구동형식이나 하중조건에는 거의 영향을 받지 않는 매우 안정된 곡률추출 성능을 보이고 있다고 평가된다. 따라서 본 곡선검지 센서는 곡선구간 차량 제어를 위한 곡선 검지기술 분야에서 매우 실용적인 기술로 활용될 것으로 기대된다. To verify the curvature estimation performance of a curve detecting sensor prototype mounted on an active steering bogie developed to improve the running performance of a railway vehicle on a curved section, a test run was conducted on the test line. To analyze the effect of the driving type of the bogie on the curvature estimation performance, the curvature was measured for a trailer bogie vehicle and a driving bogie vehicle. Compared to the track curvature inspection results, the maximum deviation was 3.4% at tare-load condition and 1.8% at full-load condition for the trailer bogie vehicle. For driving bogie vehicle, the maximum deviation was 3.4% at tare-load condition and 2.2% at full-load condition; thus, no significant difference was found according to the bogie driving type. The effect of vehicle load conditions on curvature estimation performance was also very insignificant. For the trailer bogie vehicle, the deviation from the track curvature inspection result was 3.4% at tare-load condition and 1.8% at full-load condition. And, in the case of driving bogie vehicles, the deviation was 3.4% at tare-load condition and 2.2% at full-load condition. Therefore, the curvature estimation performance of the curve detection sensor of the active steering vehicle is evaluated as excellent hardly affected by vehicle driving types or load conditions. Therefore, this curve detecting sensor is expected to be used as a practical technology in the field of curve detection technology for vehicle control in curved sections.
허현무(Hyunmoo Hur),박준혁(Joonhyuk Park),유원희(Wonhee You),박태원(Taewon Park) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The critical speed of railway bogie related to the stability of the railway rolling-stock is important. Testing of the dynamic performance of bogie is conducted using a roller rig in a laboratory in place of field testing on track. This roller rig is composed of two rollers equivalent to track and used to test the dynamic characteristics of vehicle. But, the geometrical characteristics of the wheel/roller contact on the roller rig are different from those of the wheel/rail contact because the longitudinal radius of roller is not infinite compared with rail. This difference has influence on the wheelset behavior and the critical speed of bogie. Therefore in this paper, we have studied the behavior of wheelset and bogie on the roller rig for railway bogie testing with the purpose of developing the scaled roller rig. As an analysis results, it has been shown that the critical speed of bogie on the roller rig is slightly lower than that of bogie on track.
허현무(Hyunmoo Hur) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Railway wheel profile is changed to worn profile from original profile with the increase of cumulative mileage of rolling stock. The worn profile changes contact point between wheel and rail and has an influence on wheel/rail geometric parameters as rolling radius, contact angle, equivalent conicity, etc. This changed wheel/rail geometric characteristics cause the variations of vehicle dynamic characteristics as vehicle critical speed, vibration and ride. In this respect, the wheel profile management is important with the speed-up of train. In this paper, we analyzed the wheel/rail geometric characteristics and the influences on critical speed with wheel profile wear.
허현무(Hyunmoo Hur),박준혁(Joonhyuk Park),유원희(Wonhee You),박태원(Taewon Park) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The critical speed of railway bogie relating to the stability of the railway rolling-stock is important. The dynamic performance of bogie is tested on the roller rig in a laboratory in place of field testing on track. This roller rig is composed of two rollers equivalent to track and used to test the dynamic characteristics of vehicle. But, the test on the full scale roller rig caused many problems relating to test costs, test time. To overcome these problems, the scale roller rig is used for the convenience of test effectively. But the creep coefficient relating to creep force calculation have an effect on the stability of the scale bogie. In this paper, we have studied the scale model of roller rig and analyzed the stability of the scale bogie according to the creep coefficient calculation.
허현무(Hyunmoo Hur),유원희(Wonhee You) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The critical speed related to the stability of railway rolling-stock is important. It is the lateral behaviour of the wheelset causing the hunting motion of vehicle and influenced by wheel profile, conicity, primary suspension characteristics, wheelset weight, mass moment of inertia, wheel/rail geometry, and more. In rolling-stock design, a simplified approximation for critical speed was applied practically. But, The simplified approximation did not considered the nonlinearity of the wheelset such as wheel/rail geometry, nonlinear primary suspension characteristics, it is not effective in high speed rolling-stock design. In this paper, we therefore investigated the problems of the approximation for critical speed and described some results.
전동차 차륜 마모에 따른 차륜/레일 기하학적 접촉 특성 변화 분석
허현무(Hyunmoo Hur),박준혁(Joonhyuk Park),유원희(Wonhee You),박태원(Taewon Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
In a railway vehicle, contact between wheel and rail is a peculiar characteristic and variations of wheel and rail profile influence on the dynamic characteristics of railway vehicle. Thus the variations of the wheel and rail profile are very important in railway dynamics. Recently a research relating to active steering to improve the curving performance of vehicle is progressing actively at home and abroad. In this field, a pre-study for the wheel/rail contact geometry is needed and especially the variation of the wheel/rail contact geometry with wheel wear is the key design parameter to develop the controller of the active steering bogie. In this paper, we have experimentally studied to analyze the variation of the wheel/rail contact geometry with wheel wear as a pre-study to develop the active steering bogie for electric multiple unit (EMU). For this, we have made an experiment with EMU operating in curving area. We have measured the wear profiles of the wheel of the test vehicle and analyzed the wheel/rail contact geometry with a mileage of the test vehicle. In experiment with test vehicle, we have got the useful data to design the steering controller of the wheelset.