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함덕용(D. Y. Ham),윤소남(S. N. Yun),백강년(K. N. Baek),이현철(H. C. Lee),신행봉(H. B. Shin) 유공압건설기계학회 2013 유공압건설기계학회 학술대회논문집 Vol.2013 No.10
This paper presents feasibility of a pressure reducing valve for emergency breathing system. The reducing valve consists of a valve body, a diaphragm, a diaphragm pin, springs, and a relief valve with a poppet for emergency gas discharge. The diaphragm and diaphragm pin are important equipment for the cracking pressure adjustment and control flow rate and leakage flow. In this paper, the reducing valve was designed to three-dimensional shape, and FEM based static structure analysis for pressure endurance limit was conducted. The analysis of the structure was achieved by using Ansys static structure software module. Finally, It was confirmed that the designed valve is useful to the emergency breathing system.
김영철(Y.-C. Kim),이동환(D.H. Lee),정태영(T.Y. Jeong),함덕용(D.Y. Ham),김영배(Y.B. Kim) 한국유체기계학회 2010 유체기계 연구개발 발표회 논문집 Vol.2010 No.12
A torsional damper usually used in order to reduce the torsional vibration of propeller shaft system in lots of marine diesel engines. The damper consists of leaf springs, fluid chambers, fluid channels, and intermediate masses. The leaf springs provide the stiffening force to the shaft system, and the fluid chambers and channels give the damping force. In this paper, the 1-way FSI(fluid-structure interaction) analysis has been carried out for the calculation of the stiffness and damping coefficients of the damper The numerical calculation result about the equivalent damping coefficients is compared to the value obtained from a simple damping simulation model.
윤소남 (Y. S. Nam),함덕용 (D. Y. Ham),한유리 (Y. Han),이근우 (K. W. Lee),정병홍 (B. H. Jeong) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
This study presents the possibility of the refrigerant control using electronic expansion valve which is operated by stepping motor. The electronic expansion valve is a type of flow control equipment that is a combination of a poppet, a positioner, three reduction gears and a stepping motor. The poppet modulates orifice its opening to maintain the controlled refrigerant flow. So, pitch control of the positioner and pulse control of the three reduction gears are very important design parameters for performance improvement of this study object valve. In this paper, the effects of the nonlinearity, the hysteresis on the performance and flow rate characteristics of electronic expansion valve were investigated. The input pulse of stepping motor, displacement characteristics and flow rate characteristics of this valve were analyzed through the experimental setup.
윤소남(S. N. Yun),함덕용(D. Y. Ham),한유리(Y. Han),이근우(G. W. Lee),정병홍(B. H. Jeong) 한국동력기계공학회 2008 한국동력기계공학회 학술대회 논문집 Vol.2008 No.11
In this study, EEV(Electronic Expansion Valve) which is consist of a stepping motor, 3-stage reduction gear, a positioner and a poppet valve and controls the mass flow in air conditioning system was researched. The steady state characteristics of the convential type EEV were disscussed by experiment and various types of EEV were also analyzed through the FEM calculation method. From this study, new model with a double bellows structure for air conditioning system was suggested and the performance characteristics were also evaluated.