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강기석(Ki-Sok KANG),최영수(Young-Soo CHOI),이재향(Jae-Hyang LEE),남대근(Dae-Keun NAM) 한국철도학회 2016 한국철도학회 학술발표대회논문집 Vol.2016 No.10
KTX 열차의 기계제동장치인 제동디스크는 심한 압력과 열응력을 받아 과열 냉각이 반복적으로 일어남에 따라 균열이 발생하고 있다. 균열의 한도가 기준을 초과하면 열차에서 분리하여 균열부가 사라질 때까지 디스크를 삭정하거나 폐기 한다. 삭정 등으로 인한 손실을 줄이기 위해 디스크 균열부위의 재생 방법을 몇 가지 검토 적용한 결과 용접 재생 기술을 확보하였다. 이렇게 확보된 용접기술로 재생한 제동디스크를 고속차량에 적용하여 운행한 결과 특이사항이 발견되지 않았으며, 용접 재생 디스크를 한국화학융합시험연구원(KTR)에서 특성시험 분석결과 기준 값을 만족하였다. 제동디스크 용접재생기술로 고속차량 유지보수의 효율성을 높이고 신품 구입비용을 감소시켜 경영효율화에도 기여할 것으로 기대된다. Cracks on the brake discs of KTX often occurring by repetition of the cooling and overheating due to severe press and thermal stresses. If the cracks exceed the limits, we have to separate the brake discs from the train and repair by turning or dispose permanently. For saving the discs repairing budget, we found a new welding technique through a number of experiments. After repairing the discs by our new welding technique, we have completed test run with KTX trains successfully and satisfied standards set by the Korea Testing & Research Institute(KTR). We expect improvement on efficient brake disc regeneration and reducing significantly the purchase cost of new equipment.
강기석(Ki-sok KANG),김동원(Dang-won KIM) 한국철도학회 2018 한국철도학회 학술발표대회논문집 Vol.2018 No.10
2004년 4월 고속철도가 개통되어 운행한 이래 2016년 12월부터 SRT가 운행하기 시작하여 고속철도의 경쟁시대가 시작되었다. SRT가 운행되기 전까지는 한국철도공사(코레일)에서만 고속열차를 운영하여 독점적인 지위를 가지고 있었다. SRT 개통 전후 1년간의 코레일의 고속열차 영업실적에 어떠한 변화가 있는지 운행열차수, 승차인원, 승차율, 매출액 등에 대한 비교분석을 하였다.
강기석(KANG KI-SOK) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
This paper presents an activation plan for reliability centered maintenance (RCM) of rolling stock. The KTX is carrying out the maintenance in compliance with RCM. MKBSF, that is one of the reliability indices for KTX, is shown 183,483 ㎞ in 2009, whereas it is shown 68,986 ㎞ in 2004. It means that the reliability of KTX has been growing every year. It also is result of reliability management activities. KORAIL did not apply RCM until now about the conventional rolling stocks. But KORAIL decided that applies RCM system because of reliability management effect of KTX. In this study, we tried to know an activation plan for the reliability centered maintenance of the conventional rolling stocks.
강기석(KANG Ki-Sok),김진규(KIM Jin-Kyu) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Since the opening to traffic of KTX, the clients had continuously suggested complains concerning the temperature in passenger car. To solve this problem, after consultation with KTGVC, we received the modified temperature control software for air conditioning system, and installed it on all of the trains. But, even the modified software is not suitable for our country environment. And at the change of season, there were a lot of complains that it's too cold in train. So, we concluded a contract with Merak, the manufacturing company of air conditioning system with the object of removing the inconvenience of cold and getting the suitable temperature control curve. Consequently, Korail suggested 5 temperature control curve to Merak, and Merak supplied the appropriate software according to the temperature curve. Actually, we do monitoring the train installed with the new software, and up to now, there is no suggestion of client complain. Finally we found the suitable temperature control curve for our country environment. And it will make possible to apply this curve to other air conditioning system also.
강기석(Kang Ki-Sok),신백철(Shin Beak-Chul) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
The present paper to relate with the maintenance of the high-speed vehicle, KTX and is to treat a reliability evaluation. The reliability of the high-speed vehicle while operating between-failure average mileage (MKBSF) and parts between-failure average mileage (MKBF), 1,000,000 per ㎞ service failure number of items and availability and per km evaluated a maintenance expense. The reliability evaluation results and 2007 year reliability management indexes compared in 2006 years and they improved, per km the maintenance expense compared at 2006 and 36.6% was decreased. Reliability management activity leads and availability of the high-speed vehicle, safety improves and with the fact that will be able to decrease the maintenance expense which is an economic scale of railroad service is expected.
강기석(KANG Ki-Sok),김진규(KIM Jin-Kyu) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
Since opening of the high speed railroad in Korea, service result of the last 5 years is commandable. About 236million passengers had taken KTX until February 2009, and number of trains in service per day during week-end increased from 128 to 181, meaning that it's grown about 40%. And MKBSF, one of indicators of the high speed railroad's reliability, registered 680,469㎞ at the end of the year 2008, witch is 6 times more than 121,000㎞, contract base when KTX was introduced. With increasing number of trains in service, not only passengers use the high speed railroad more frequently, but also we assure its reliability through maintenance based on reliability And actually we gather information concerning all kind of defects occurred during train circulation and then, analyse them, and eradicate their causes in order to improve the high speed railroad's reliability. This paper describes a verification test process to analyse causes of defective function about train's traction.