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현차시험에 의한 디젤기관차용 합성제륜자의 마모특성 연구
권석진(Kwon Seok-Jin),최경진(Choi Kyung-Jin),고광범(Ko Kang-Bum),이장희(Lee Jang-Hee) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper, we investigated the wear rate, braking temperature and stopping distance of the composite brake shoe for diesel locomotive in the field test. The wear rate and braking temperature of the composite brake shoe would rather than cast iron. Also, the stopping distance of composite brake shoe is 450m at 100㎞/h. This result of field test shown that the density distribution of the composite brake shoe influence on wear rate.
파손시나리오에 의한 차륜-레일의 파괴역학적 안전성 평가
권석진(Seok-Jin Kwon),이동형(Dong-Hyung Lee),서정원(Jung-Won Seo),구병춘(Byeung-Chun Goo) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Fracture mechanics approach can be severly hampered unless considerable detailed specific knowledge is available. The problem of railway wheel-rail system fatigue design is currently undertaken by using assumed conservative design procedures. However, although the failure rate is low, the consequences of any such failure can be far reaching. It has been demonstrated that the tools available for effective management have limits. In the present study, the safety evaluation based on fracture mechanics is carried out. The critical crack size and remaining lifetime are calculated on the wheel for high-speed train.
권석진(Seok-Jin Kwon),서정원(Jung-Won Seo),이동형(Dong-Hyong Lee),김영규(Young-Kyu Kim),김재철(Jae-Chul Kim) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
The thermo-mechanical interaction between brake block and wheel tread during braking has been found to cause thermal crack on the wheel tread. Due to thermal expansion of the rim material the thermal cracks will protrude from the wheel tread and be more exposed to wear during the wheel/block contact than the rest of the tread surface. The wheel rim is in residual compression stress when is new. After service running the region in the tread has reversed to tension. This condition can lead to the formation and growth of thermal cracks in the rim which can ultimately lead to premature failure of wheel. In the present paper the thermal cracks of railway wheel one of severe damages on the wheel tread were evaluated to understand the safety of railway wheel in running condition. The residual stresses for damaged wheel which are applied to tread brake are investigated. Mainly X-ray diffusion method is used. Under the condition of concurrent loading of continuous rolling contact with rails and cyclic frictional heat from brake blocks the reduction of residual stress is found to correlate well with the thermal crack initiation.
적외선열화상 이미지법과 패턴 인식을 이용한 철도차량 회전기기의 비파괴 진단
권석진(Seok Jin Kwon),김민수(Min Su Kim),서정원(Jung Won Seo),강부병(Bu Beong Kang) 한국비파괴검사학회 2016 한국비파괴검사학회지 Vol.36 No.4
차량 부품의 고장은 운용 중단과 탈선 결과로 나타날 수 있으며 차량 주요부품의 이상상태를 진단하는 것은 중요하다. 온도를 이용한 진단 방법은 철도차량 회전기기의 –예를 들면, 베어링, 감속기, 견인전동기, 디스크- 비정상 상태를 진단하는 기본적인 방법이다. 본 연구에서는 적외선열화상과 패턴 이미지법을 이용하여 차량 하부의 회전기기의 이상 진단시스템을 구축하여 현장시험을 수행하였다. 그 이상상태 진단시스템은 차량 하부 회전기기의 이상발열 상태를 진단할 수 있었으며 비정상 상태를 평가할 수 있었다. The faults in railway vehicle components may result in either the stoppage of the service and the derailment of the vehicle. Therefore, it is important to diagnose and monitor the main components of a railway vehicle. The use of temperature is one of the basic methods for the diagnosis of abnormal conditions in the rotational components of a railway vehicle, such as bearings, reduction gears, brake discs, wheels and traction motors. In the present study, the diagnose of the rotational components using infrared thermography and a pattern recognition technique was carried out and a field test was performed. The results show that this method of diagnosis using infrared thermography can be used to identify abnormal conditions in rotational components of a railway vehicle.