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윤소남(S. N. Yun),함영복(Y. B. Ham),박중호(J. H. Park),윤동원(D. W. Youn),김광영(K. Y. Kim),김고도(K. D. Kim) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The purpose of this study is to bring out the optimal design factors which effect on dynamic characteristics in the design of flow control servo valve with high response characteristics, and to verify the validity of the design factors. In this study, force feedback type flow control valve with nozzle/flapper and with no drain is studied. And, the mutual effect of the parameters such as fixed orifice, nozzle diameter, and maximum displacement between nozzle and flapper are analyzed. We have done simulations using the optimal design factors and simulink(Matlab) as a simulation tool, and verified the validity of our simulations by means of comparison our simulation results with an experimental results of another similar valve.
윤소남(S. N. Yun),윤동원(D. W. Youn),정용현(Y. H. Jung),이현철(H. C. Lee) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Generally, diesel vehicles emit the toxic gases including nitrogen and produce noise during operation. these problems deteriorate the comport of passangers, environmental pollutions and energy saving. As the solution for the above-mentioned problems, the method, which involves the injection of high pressure and atomization of fuel, is needed to improve the combution process of diesel engine. In this study, researches for performance improvement of the high pressure control valve with solenoid actuator used in Common Rail System of diesel vehicle were accomplished. Also, the results of numerical analysis from the FEM and effects of the design parameters were discussed.
박중호(J. H. Park),함영복(Y. B. Ham),윤소남(S. N. Yun),윤동원(D. W. Youn) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In this paper, two types of piezoelectric micropumps having high power density are presented, which are applicable to miniature and individual fluid power sources for practical micromachines such as an in-pipe working microrobot and microfactory manufacturing mechanical micro parts. First, a piezoelectric micropump using resonance drive is presented. It basically consists of a metal bellows as a reciprocating chamber, a piezoelectric actuator and an additional mass for oscillating the bellows, and two check valves. The small displacement of piezoelectric actuator is magnified through resonance drive of pump driving unit. Pumping characteristics of the fabricated micropump are experimentally investigated and its applications are attempted to the micromachine and micropress. Second, a novel piezoelectric micropump using narrow pipeline element instead of the outlet check valve is presented. It utilizes a fluid inertia effect caused by a fast flow of the pipeline element and achieves a high pumping performance level. Also, its application to robot hand and micro bender is tested.
박중호(J. H. Park),조선미(S. M. Cho),윤동원(D. W. Youn),윤소남(S. N. Yun),안경관(K. K. Ahn) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
A simple pressure control valve using magneto-rheological (MR) fluid is presented, which is called the MR valve. The MR valve utilizes the apparent viscosity controllability of the MR fluid in the magnetic field and controls high-level fluid power without moving parts. However, conventional MR fluids have high base viscosities to disperse heavy soft iron particles and lose fluid power in pipes. In this study, low base viscosity MR fluids are developed using lightweight ferrite particles and applied to the MR valve. First, four MR fluids are fabricated with different compositions and the basic characteristics. are experimentally investigated with the 2-port MR valve. Second, a small-sized 3-port MR valve using a permanent magnet is proposed and the design procedure is theoretically derived. Third, the 3-port MR valve is fabricated and magnetic field analysis is performed. Furthermore, static and dynamic characteristics of the MR valve are experimentally investigated.