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오재민(J. M. Oh),한봉준(B. J. Han),최세령(S. R. Choe),이일영(I. Y. Lee) 유공압건설기계학회 2013 유공압건설기계학회 학술대회논문집 Vol.2013 No.10
A wind power-heat generation system which converts wind power directly to heat instead of transforming it to electric power beforehand is considered in this study. The system is composed of a wind turbine part and a heat generation part. The heat generation part is realized by a hydraulic system which includes a hydraulic pump, a hydraulic pipeline, a throttle valve, a hydraulic oil tank and etc. The throttle valve should have function of energy conversion from hydraulic energy to heat energy primarily. In addition, it should have a function of over-speed protection under excessive wind speed at typhoon situation. In this study, the authors suggest two new throttle valve designs which has excellent flow control characteristics under excessive pump driving torque(excessive wind speed). The performances of designed valves are analysed through numerical simulations.
오재민(J. M. Oh),최세령(S. R. Choi),이일영(I. Y. Lee) 유공압건설기계학회 2014 유공압건설기계학회 학술대회논문집 Vol.2014 No.9
In this study, the flow and pressure pulsation in a high pressure fuel pump for gasoline engine is investigated. The pump changes a low pressure flow supplied from fuel transfer pump to high pressure flow in order to improve the engine efficiency. The pump supplies a high pressure fuel to common rail. It is the core part in the fuel supply system. It is essential to have a excellent durability because it should be operated in poor working condition. Pulsation and vibration is related on the pump durability. In this study, the author analyzes the operating principle of this pump and performs the experiment focusing on pulsation. The characteristics of the fuel pump is investigated and a reliable simulation model is developed by AMESim software. The simulation model is verified by comparing simulation results with experiments.
김현호(H. H. Kim),오재민(J. M. Oh),허준영(J. H. Huh),이일영(I. Y. Lee) 유공압건설기계학회 2014 유공압건설기계학회 학술대회논문집 Vol.2014 No.9
This paper studies on the dynamic characteristics of electric hydrostatic actuator(EHA). In order to improve the dynamic characteristics of EHA, modified PI-D controller, feed-forward controller and input shaping filter were applied. A reference input following controller (including PI-D and feed-forward controller) which enables robust control of the EHA under disturbances is devised using pole placement method and zero placement method. Then, an input shaping filter was incorporated to the devised control system to improve reference following characteristic in high frequency range. The effectiveness of the suggested control design is verified through experiments.
지상원(S. W. Ji),오재민(J. M. Oh),정은석(E. S. Jeong),김병곤(B. K. Kim),이일영(I. Y. Lee) 유공압건설기계학회 2015 드라이브·컨트롤 Vol.12 No.1
For testing a newly designed ship"s steering gear, a steering gear test bench with a steering gear to be tested and a load generation part should be prepared. The load given to the steering gear has to be pertinent to the load generated in a targeted ship. In this study, the authors suggest a process of estimating the load given to steering gears in ships. At first, a test for measuring the load in the steering gear of a real ship was conducted. Then, a process was developed to compute rudder driving torque and force by using basic equations including some empirical equations on ship"s steering. The test results and the computation results on the load in the steering gear were compared, As a result, the process suggested in this study for estimating load in ship"s steering gears was verified.