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이성래,Lee, Seong-Rae 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.11
A transient hydraulic flow rate computation scheme is described here so that the transient hydraulic flow rate can be determined using the dynamic pressure measurements at the ends of a straight flow line with a dynamic model of the hydraulic line. This method can be applied to determine the orifice ares of high response valve. Simulation results indicate that the method is relatively robust to realistic levels of uncertainties in the fluid properties.
양방향펌프와 편로드실린더에 의한 리프터의 구동에 관한 연구
이성래,김제민,Lee, Seong-Rae,Kim, Je-Min 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.4
The motion of single-rod cylinder is typically controlled by the directional control valve. In some case, the hydraulic system should be energized by the man power and at the same time the motion of a cylinder is controlled manually. It may be confusing for a man to do two things at the same time. The solution is to make up the closed hydraulic circuit with the bi-directional pump and single-rod cylinder without using a directional control valve. In the case of single-rod cylinder, the flows at the rod side and head side are so different that several valves should be installed to make the motion of single-rod cylinder possible. The hydraulic system is composed of a bi-directional pump, a single-rod cylinder, pilot operated check valves, a check valve and a counter balance valve for the purpose of actuating the lifter. The characteristics of a suggested system are analysized mathematically and numerically.
해석적 Bode 방법에 의한 직접구동형서보밸브의 고전적 제어기 설계
이성래,최현영,문의준,Lee, Seong-Rae,Choe, Hyeon-Yeong,Mun, Ui-Jun 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.4
Direct drive servovalve(DDV) is a kind of one-stage valve since the rotary motion of DC motor is directly transferred to the linear motion of valve spool through the link. Since the structure of DDV is simple, it is less expensive, more reliable and offers reduced internal leakage and reduced sensitivity to fluid contamination. However, the flow force effect on the spool motion is significant such that it induces large steady-state error in a step response. If the proportional control gain is increased to reduce the steady-state error, the system becomes unstable. In order to satisfy the system design requirements, the classical controller is designed using the analytical Bode method.
이성래(Seong-Rae Lee),김형의(Hyoung-Eui Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
It is very important for the manufacturers to predict the life of hydraulic system components according to the results of life tests. Since it takes too much time to test the hydraulic system components until failure, the no-failure test method is applied for the life test of them. If the shape parameter of Weibull distribution, the number of samples, the confidence level, and the assurance life are given, the no-failure test times of hydraulic system components can be calculated by given equations. Here, the procedures to obtain the no-failure test times of the hydraulic system components such as hydraulic motors and pumps, hydraulic cylinders, hydraulic valves, hydraulic accumulators, hydraulic hoses, and hydraulic filters are described briefly.
이성래(Seong-Rae Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The turnover-type sluice gate is typically actuated by the hydrauic system. The hydraulic system may be a open circuit type or a closed circuit type. The open circuit type hydraulic system is composed of a uni-directional pump, a directional control valve, pilot operated check valves, flow control valves, single-rod cylinders. The closed circuit type hydraulic system is composed of a bi-directional pump, pilot operated check valves, check valves, a counter balance valve, single-rod cylinders. The energy efficiencies of two hydraulic systems for the turnover-type sluice gate are compared here.
이성래(Seong-Rae Lee) 유공압건설기계학회 2011 유공압건설기계학회 학술대회논문집 Vol.2011 No.6
The load analysid program of rotating-type floodgate actuated by the hydraulic cylinders is developed using the Excel program language. The mathematical model of the floodgate actuating system is derived. Then the mathematical model is transformed into Excel program which calculates the water pressure moment, gate weight moment, cylinder length, cylinder force and cylinder pressure versus gate angle of 0~60[deg] upon the physical and geometrical parameters such as the gate weight and the installation positions of gate, roller, link, hydraulic cylinder. The user can install the Excel language in low cost and understand it easily comparing to the Matlab or Visual C++ languages.
실험계획법과 콤플렉스법에 의한 고성능 유압휴즈의 최적 설계
이성래(Seong Rae Lee) 유공압건설기계학회 2015 드라이브·컨트롤 Vol.12 No.4
A quick-acting hydraulic fuse, which is mainly composed of a poppet, a seat, and a spring, must be designed to minimize the leaked oil volume during fuse operation on a line rupture. The optimal design parameters of a quick-acting hydraulic fuse were searched using the design of experiments method and the complex method. First, the L50(5<SUP>4</SUP>) orthogonal array is used to find the robust minimum point among the 625 points of design variables. The serach range can then be narrowed around the robust minimum point. Second, the L50(5<SUP>4</SUP>) orthogonal array is used to obtain the variations of the design variables in the narrowed search range. The variations of design variables are used to set the structure of a polynomial equation representing the leakage oil volume of the quick-acting hydraulic fuse. The least squares method is then applied to obtain the coefficients of polynomial equation. Finally, the complex method is used to find the optimal design parameters where the objective function is described by the polynomial equation.