• Proceedings of the KSR Conference
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• 2008.11b
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• pp.441-445
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• 2008

LRT is eco-friendly transportation system and can be constructed at less than half cost of subway. Therefore many local governments have planned to construct a various type of LRT and some of them were already under construction. In Para. 2 of Art. 22 of the "Enforcement Decree of Urban Railroad Act" - safety standard of urban railroad vehicle, It can't be operated if "structures and devices" don't come up to standard required to safety operation. Constructor or operator should give an order or operate according to safety standard in Art. 3 of the Safety Standard of Urban Railroad Vehicle. Safety Standard of Urban Railroad Vehicle of 2000 was reformed once to tighten fire safety standard in 2004 after subway accident in Daegue. It was entirely made for medium and large-sized electric motor car. LRT, based on driverless operation and articulated bogie, has different safety standard in signalling devices and the axle load. etc. So many institutes related LRT have required to amend. In this paper, we described features of LRT vehicle and necessity of amendment and discussed how it should be amended.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.40 no.9
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• pp.835-842
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• 2016

In Korea, urban railway cars are typically maintained using the strategy of predictive maintenance. In an effort to overcome the limitations of the existing strategy, there is increased interest in adopting the condition-based maintenance strategy. In this study, a novel method is proposed to detect faults in the solenoid valves of the braking system in urban railway vehicles. We determined the key component (i.e., solenoid valve) that leads to braking system faults through the analysis of failure modes, effects, and criticality. Then, an equivalent circuit model was developed with the compensation of the temperature effect on solenoid coils. Finally, we presented how to detect faults with the equivalent circuit model and current signal measurements. To demonstrate the performance of the proposed method, we conducted a case study using real solenoid valves taken from urban railway vehicles. In summary, it was shown that the proposed method can be effective to detect faults in solenoid valves. We anticipate the outcome from this study can help secure the safety and reliability of urban railway vehicles.

• Proceedings of the KSR Conference
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• 2010.06a
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• pp.1335-1344
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• 2010

Urban railroad is the central axis of public transportation which transport the citizens quickly and safely. The idea of the maintenance of urban railroad cars is preventive maintenance aiming at breakdown prevention, and it should be performed conforming to the fixed regulations and maintenance guide. The accuracy of maintenance and the punctuality of rolling stock operation could be secured by reliable inspection equipments. In this study, a scientific maintenance and safe operation of rolling stocks & a method of improving work efficiency will be examined through the case that Busan Urban Railroad has developed its own vehicle inspection equipment and has been making good use of it.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.900-901
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• 2015

본 논문은 210kW급 도시철도차량 견인용 IPMSM(Interior Permanent Magnet Synchronous Motor)의 온도포화를 고려할 경우 사마륨 코발트 영구자석($Sm_2CO_{17}$) 사용의 타당성을 검증하는 논문이다. 기존에 설계되고 있는 Nd 자석과 사마륨 코발트 자석을 비교하고 각각의 자석을 사용한 IPMSM의 특성을 비교한다. 온도 시험은 영구자석 감자를 대비하여 사마륨 코발트 자석을 사용하였고, 전동기 각 상 권선의 온도와 고정자 철심의 온도변화를 시간에 따라 측정하여 전동기의 포화온도를 예측 하였다. 이를 바탕으로 전폐형 공랭식 도시철도차량 견인용 IPMSM의 설계모델을 제안한다.

• Journal of the Korean Society for Railway
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• v.15 no.6
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• pp.550-557
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• 2012

In general, FMECA is a technique for identifying failure modes and devices which could result in fatal outcomes. Also it can be used in design or in maintenance through establishing priorities. The purpose of this paper is aimed at improving the driving conditions in advance through analyzing the operation failure phenomena quantitatively with FMECA analysis on the onboard signal system equipped with ATC/ATO, and through deriving the risk factors. This paper suggests an alternative solution for improving the performance of ADU by analyzing a case with FMECA.

• Air Cleaning Technology
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• v.32 no.3
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• pp.28-37
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• 2019

• Air Cleaning Technology
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• v.32 no.3
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• pp.38-47
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• 2019

• Proceedings of the KSR Conference
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• 2006.05b
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• pp.51-58
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• 2006

• Proceedings of the KIPE Conference
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• 2020.08a
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• pp.284-285
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• 2020

기존 국내 도시철도차량 추진시스템의 주변압기의 경우 권선형의 유입식 변압기가 사용되고 있다. 이러한 입력용 주변압기는 일반적으로 무게가 많이 나가며 전력밀도가 낮다. 또한 기존의 변압기의 경우 오일을 이용하여 절연을 하기 때문에, 정기적인 유지 보수에 따른 비용 발생 및 절연유의 오염에 따라 변압기 수명 단축 및 전력 품질 저하, 전력 손실증가, 전압 강하, 누유에 의한 환경 문제 등 여러 문제를 가지고 있다. 본 논문에서는 권선형 유입식 변압기를 대체하는 반도체 변압기 시스템 모델을 제안하였다.

• Proceedings of the KIEE Conference
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• 2003.07b
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• pp.1279-1281
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• 2003

도시철도차량의 AC/DC 절연구간 통과 방법에 대한 사례를 조사하고 과천선 전동차의 절연구간 구간 통과시 관련 장치의 동작시간을 분석하며 MCB(Main Curcuit Breaker)가 동작할 수 있도록 할 수 있는 다양한 원인에 대한 검토와 측정 결과를 통하여 정확한 원인을 분석한다.