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고속차량(KTX-Ⅱ) RAM 목표값 설정을 통한 소요량 연구
차재환(Cha Jae-hwan),정인수(Chung In-soo),김종운(Kim Jong-Woon),유양하(Yu Yang Ha) 한국철도학회 2009 한국철도학회 세미나자료 Vol.2009 No.5
There are almost no studies on verification of requirements for high speed rolling stocks by means of RAM goals and on setting RAM goals by means of verification on practical reliability, availability and maintainability for high speed rolling stocks though they are covered in specification of an order that RAM goals asked of roll ing stocks are shown for gaining high quality of them and availability when they are in operation. This study is for estimating number of high speed train-sets that would be supplementarily placed an order through verification of RAM goals of a project for the introduction of KTX-Ⅱ 100 cars. It verify that optimized requirements for high speed rolling stocks by relatively comparison with between requirements for train-sets through setting RAM goals and requirements for train-sets through analysis of prospects for management balance with high speed rolling stocks.
이단유로 축전식 탈염공정의 하수고도처리 적용가능성 평가
차재환(Jae Hwan Cha),신경숙(Kyung Sook Shin),이정철(Jung Chul Lee),박승국(Seung Kook Park),박남수(Nam Su Park),송의열(Eui Yeol Song) 大韓環境工學會 2014 대한환경공학회지 Vol.36 No.4
본 연구는 물 재이용을 위한 하수고도처리공정으로서 이단유로 축전식 탈염공정의 적용 가능성을 평가하였다. 일반적으로 축전식 탈염장치는 전극이 병렬식으로 단순 적층되어 있는 반면에 이단유로 축전식 탈염장치는 분리판에 의해 모듈이 2개의 단으로 구분되어 1단과 2단이 수리학적 직렬연결이 되도록 고안되었다. 동일한 유입조건에서 전산유체역학 분석결과 이단유로 모듈이 단일유로 모듈에 비해 스페이서에서 보다 균등하고 빠른 유속분포를 보였고, 사영역도 상대적으로 작게 나타났다. 하지만 입구와 출구 간 압력강하는 단일유로 모듈이 0.4 bar인 반면 이단유로 모듈은 0.7 bar로 높게 나타났다. NaCl용액을 원수로 사용한 단위셀 테스트 결과, 단일유로와 이단유로의 최대 탈염효율은 유입유량 10 mL/min/cell pair에서 각각 88%, 91%이었다. 유량증가에 따른 단위셀 압력강하의 증가는 이단유로가 단일유로보다 높게 나타났으며, 유입유량 70mL/min/cell pair에서 이단유로의 압력강하는 1.67 bar로 단일유로의 압력강하보다 2배 높게 나타났다. 이단유로의 압력강하를 완화시키기 위하여 전극 간 간격을 100에서 200 μm으로 늘린 결과, 탈염효율은 유사하게 유지하면서 압력강하는 최대 0.87 bar로 낮게 유지할 수 있었다. Proto-type 축전식 탈염장치에 하수처리수를 주입하여 연속 운전한 결과, TDS 제거효율은 평균 78%로 나타났으며, 특정이온의 경우, NH₄+-N, NO₃--N 및 PO₄ 3--P 제거효율이 각각 50%, 93% 및 50%로 나타나 질소제거 관점에서 CDI기술의 하수고도처리공정 활용가능성이 높을 것으로 판단된다. This study demonstrates a double-path CDI as an alternative of advanced wastewater treatment process. While the CDI typically consists of many pairs of electrodes connected in parallel, the new double-path CDI is designed to have series flow path by dividing the module into two stages. The CFD model showed that the double-path had uniform flow distribution with higher velocity and less dead zone compared with the single-path. However, the double-path was predicted to have higher pressure drop (0.7 bar) compared the single-path (0.4 bar). From the unit cell test, the highest TDS removal efficiencies of single- and double-path were up to 88% and 91%, respectively. The rate of increase in pressure drop with an increase of flow rate was higher in double-path than single-path. At 70 mL/min of flow rate, the pressure drop of double-path was 1.67 bar, which was two times higher than single-path. When the electrode spacing was increased from 100 to 200 μm, the pressure drop of double path decreased from 1.67 to 0.87 bar, while there was little difference in TDS removal. When proto type double-path CDI was operated using sewage water, TDS, NH₄ +-N, NO₃ --N and PO₄ 3--P removal efficiencies were up to 78%, 50%, 93% and 50%, respectively.
안전한 고객수송서비스를 위한 KTX-II RAMS 적용기준
차재환(Cha Jae-hwan),정인수(Chung In-soo),조광우(Jo Kwang-Woo) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Currently, it has been a fashion to include RAMS of rolling stock in the order for purchasing the rolling stock. However, it’s only to suggest a qualitative value or an ideal target without giving or demonstrating actual RAMS target, with only demonstrating passive RAMS by the data provided by the manufacturer. In the case of KTX project of 100 cars of KTX-Ⅱ contracted in June 2006, their target has been suggested from the previous RAMS application standard and it aimed to achieve the reliability level of equivalent high speed rolling stock. Afterward, as actual KTX-Ⅱ RAMS Plan and RAMS Demonstration Plan has been prepared and approved, it has been the first problem to secure the reliability and safety in order to introduce the new high speed rolling stock(KTX-Ⅱ) successfully and we actually tried to apply overseas RAMS standard, KTX samples, electric railcar MTRC and rolling stock samples. This Report was dealt world trends of Railway RAMS standard, KTX-II RAMS Specifications, the present condition of KTX-II RAMS performance and development a way of KTX-II RAMS, We hope the “KTX-Ⅱ RAMS Application Standard for Safety of Passenger Transportation Service” is served as an opportunity for the basic research for establishing and demonstrating RAMS target of components or parts composing the rolling stock system.
FMECA를 활용한 KTX-Ⅱ 공기제동장치 예방유지보수 업무 향상에 관한 연구
차재환(Cha Jae Hwan),김종운(Kim Jong Woon),이희성(Lee Hi Sung) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
RAMS is the essential element to be managed by the operator for the quality and the availability of Raiload service. On this study, we would like to propose the analysis model to improve the Maintainability of new KTX-Ⅱ. It is the FMECA analysis on pneumatic braking-system in KTX-Ⅱ's operation for which we can evaluate the adequacy of the maintenance work and apply the improved solution.