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이기형(Kihyung Lee),김용래(Yonglae Kim),배재일(Jaeil Bae) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, the international regulations about the exhaust emission of the motorcycle have been strengthened. In case of the motorcycle engines, the quantity of the exhaust emission is larger than that of the car because of the carburetor type fuel supply system, which can not control the A/F precisely. Therefore, the electrically controlled fuel injection type motorcycle has been emphasized to meet with this regulation. However, since the pulsation phenomenon happens in the intake port of the motorcycle because of the characteristic of high speed and the smaller layout than the passenger car driving condition, there are many difficulties to select the factor about control parameters needed to develop the ECU system. For addition, an air flow rate is the important basis parameter at the ECU system. In this paper, the pulsation values measured from the engine test were compared with the calculated value by WAVE, and we analyzed the intake pressure characteristic according to the driving condition. Finally, an air flow rate is estimated by simulation method.
[가솔린엔진부문] Bench Test에 의한 가솔린직분식 인젝터 선단면의 Deposit 누적에 대한 온도와 Ni코팅의 영향
김용태(Yongtae Kim),김병수(Byeongsoo Kim),배재일(Jaeil Bae),백승국(Seungkook Baik),최승연(Seungyeon Choi) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, gasoline direct injection (GOD engine was developed for increasing of its power, fuel economy and decreasing of engine emissions. It requires high-pressure fuel supply system because fuel is directly injected into combustion chamber with high pressure. Previous authors reported soot and deposit formation on the wall of combustion chamber and injector tip surface because of its injector exposed into combustion chamber. Specially deposit formation on the injector tip surface induced fuel spray pattern change and fuel quantity fluctuation, therefore it is generated unstable combustion.<br/> High-pressure injection injector's performance is very important because directly affect to performance of GDI engine. In this study, we tried panel coking test method for investigate of deposit accumulation on the injector tip surface<br/>
ME-LGI 선박엔진용 연료분사밸브 테스터 개발을 위한 시스템 엔지니어링 기반 개념 설계
노현정(Hyonjeong Noh),강관구(Kwangu Kang),배재일(Jaeil Bae) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.5
최근 강화된 환경규제 및 높은 연비에 대한 요구로 인해 천연가스를 연료로 사용하는 선박이 증가하고 있다. 친환경 선박 연료로 대두되고 있는 LPG 혹은 메탄올을 사용한 선박의 요구도 증가하고 있다. 이러한 흐름의 연장선상으로 LPG 혹은 메탄올을 사용하는 ME-LGI 엔진에 대한 연구가 최근 활발히 이루어지고 있다. ME-LGI 엔진을 탑재한 선박은, 선박 항해 중 연료분사밸브의 작동 신뢰도를 지속적인 테스트를 통해 확인해야할 필요가 있다. 따라서 연료분사밸브 테스터의 개발은 ME-LGI 엔진의 상용화를 위해 반드시 필요하다. 이에 본 연구에서는 요구조건 분석, 기능분석, 설계 합성의 순서로 진행되는 시스템 엔지니어링 프로세스를 활용하여 ME-LGI 엔진용 연료분사밸브 테스터의 개념설계를 수행하였다. 요구조건 분석 단계에서 먼저 연료분사밸브의 작동 프로세스를 분석하였고, 밀폐 오일 누유 여부 확인의 필요성을 도출하였다. 그 다음 기능분석단계에서 연료분사밸브 테스터의 기능 및 기능의 흐름을 수준별로 정의하였다. 이후 설계 합성 단계에서 각 기능에 해당하는 장비들을 설정하였고, 이를 바탕으로 process block diagram을 도출하였다. 또한 시스템 분석 및 조정 단계의 일환으로 초기위험도 분석을 수행하여 안전 방안을 개념설계 안에 추가하였다. 본 연구는 시스템 엔지니어링 프로세스가 개념설계에 적용되는 과정을 상세히 보여줌으로써 향후 타 시스템의 개념 설계 시 좋은 참고자료가 될 수 있을 것으로 기대된다. As environmental regulations have been strengthened and high fuel efficiency has been in demand in recent years, the number of ships using natural gas as a fuel is increasing. The demand for ships using LPG or methanol, which are emerging as eco-friendly vessel fuels, is also increasing. In this perspective, ME-LGI engines using LPG or methanol as a fuel have attracted considerable attention. Ships equipped with an ME-LGI engine are required to check the reliability of the fuel injection valve during shipping. This means that the development of a fuel injection valve tester is essential for the commercialization of ME-LGI engine. This study conducted the conceptual design of a fuel injection valve tester for ME-LGI engines using a system engineering process in the order of requirements analysis, functional analysis, and design synthesis. In the requirement analysis stage, the operating process of fuel injection valve was analyzed, and the necessity of checking the sealing oil leakage was then derived. In the functional analysis stage, the functions and flow of them were defined at each functional level. In the design synthesis stage, the equipment for each function was set and the process block diagram based on it was derived. In addition, preliminary risk analysis was performed as a part of system analysis and control, and safety measures were added to the conceptual design. This study is expected to be a good reference material for the concept design of other systems in the future because it shows the application process of a system engineering process to the conceptual design in detail.
전산해석을 이용한 해양플랜트용 토크머신 구조 안정성평가 및 거동 시뮬레이션 연구
김지선(JISUN KIM),최주형(JOOHYOUNG CHOI),김정환(JEONGHWAN KIM),배재일(JAEIL BAE),정재욱(JAEWOOK JUNG) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Since the pipes used in drilling must not be separated during the drilling process, it should be strongly fastened with the large torque. The torque-machine is used for clamping and loosing pipes used in drilling. In this study, structure analysis is performed about principal components of torque machine, the pipe clamping process is established and the simulation model for clamping process is built through the rigid multi-body dynamics analysis.
수치해석을 이용한 해양시추용 드릴비트의 구조적 안전성 평가
유찬욱(Ryu canuk),박재현(Park jaehyoun),김정렬(Kim jeongryul),배재일(Bae jaeil) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
A drill bit is the component of the offshore drilling machine for pulverizing the aquifer which is under the abyssal sea to drill for oil and gas. During top drive are spinning, it connect with drill collar, pipe and then also spinning all of them. In this paper, the strength of drill bit are implemented to evaluate to drill bit safety when the abyssal sea which is considered only 1,700m pressure to the drill bit. Additionally, the torque from top drive also applied in this analysis. The drill bit have many kind of types, the previous analysis it chose tungsten carbide type. Base on the analysis results, we conclude that the tungsten carbide type drill bit could perform the drilling aquifer.
심해저 광물자원 양광시스템 실증 시험을 위한 위험도 기반 선상 설비 설계
조수길(Su-gil Cho),박상현(Sanghyun Park),오재원(Jaewon Oh),민천홍(Cheonhong Min),김성순(Seongsoon Kim),김형우(Hyung-Woo Kim),여태경(Tae Kyung Yeu),정정열(Jung Yeul Jung),배재일(Jaeil Bae),홍섭(Sup Hong) 한국해양공학회 2016 韓國海洋工學會誌 Vol.30 No.6
This study had the goal of designing onboard structures for a pre-pilot mining test (PPMT), which is required for the commercialization of the deep-sea mining industry. This PPMT is planned to validate the performance of a hydraulic lifting system and verify the concept of operating through a moon-pool in the east sea, Korea. All of the onboard equipment and facility were designed by KRISO. Because the test was performed at the first development, it is difficult to determine what risk will occur in the facility. Therefore, risk-based design is required in the facility for the PPMT, which includes the facility layout, failure mode and effect analysis (FMEA), and risk reduction plan. All of the expected performances of the lifting system itself and the onboard facilities were qualitatively validated using the risk-based design.