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제1종 LiBr-H<sub>2</sub>O 흡수식 열펌프의 시뮬레이션
허준영,최영돈,Huh, J.Y.,Choi, Y.D. 대한설비공학회 1990 설비공학 논문집 Vol.2 No.1
The first kind LiBr -$H_2O$ absorption heat pump system was simulated and the performances of it were predicted. The elements of heat pump system, evaporator, absorber and generator were analysed by solving the energy balance equations and concentration equations which describe the reactions between working fluids. The results show that the temperature gain of absorber and condenser and the COP of the system are affected considerably by the operating conditions of heat pump system.
2종 LiBr - H<sub>2</sub>O 흡수식 열펌프의 시뮬레이션
허준영,최영돈,Huh, J.Y.,Choi, Y.D. 대한설비공학회 1989 설비공학 논문집 Vol.1 No.2
The second kind LiBr-$H_2O$ absorption heat pump system was simulated and the performances of it were predicted. The elements of heat pump system, evaporator, absorber and generator were analysed by solving the energy balance equations and concentration equations which describe the reactions between working fluids. The results show that the temperature gain of absorber is affected considerably by the operating conditions of heat pump system, on the other hand, COP is little affected by them.
허준영(J. Y. Huh),정성원(S. W. Jeong),박성수(S. S. Park) 유공압건설기계학회 2010 유공압건설기계학회 학술대회논문집 Vol.2010 No.10
Generally, an appartus is called as winch system, which is used to life a heavy body to high place winding wired-rope on a cylindrical drum. A load holding valve is used in winch system. The function of load holding valve is to protect over-run and free falling of inertia load. This study deals with a pressure control of hydraulic winch system using load holding valve. To examine the static characteristics of this winch system, firstly a simple model of winch system is derived. Ans some equations which designate the static characteristics are derived and calculated using Matlab. Finally AMESim simulation was used to verify results of analysis about hydraulic winch system.
허준영(J. Y. Huh) 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.6
text Almost every hydraulic system is equipped with a pressure relief valve to maintain the working pressure of the system at a pre-determined level. Therefore, dynamic characteristics of such a relief valve in conjunction with other hydraulic components are important in designing the hydraulic control system. The single stage pressure relief valve is dynamically undesirable due to relatively low viscous damping that causes the high frequency oscillations. This problem is overcome by introducing an orifice in the inner pilot line. In this study, for the single stage pressure relief valve, the system equations were linearised and several simplification were made to use the transfer function formulation technique. All the coefficients were evaluated and used to make some results by using Matlab/Simulink software. Simulation results are compared with AMESim results.
허준영(J. Y. Huh),김현호(H. H. Kim),이일영(I. Y. Lee) 유공압건설기계학회 2014 유공압건설기계학회 학술대회논문집 Vol.2014 No.9
Recently the development of an Electro-Hydrostatic Actuator(EHA) is progressed as a part of a research for energy saving. EHA is usually composed of a direct diven pump from an electric motor and is available to control cylinder displacement or velocity with high efficiency. In addition, it has the merritt of compactness, minimum leakage and the availability of the decentralized control. In this study, EHA system is designed to decrease the path following error, manufactured for test. The method of linearization provided in AMESim software was used to derive the model of EHA system. The derived model through this modeling process is applied to design the PI-D controller to overcome the disturbance effectively. The effectiveness of this controller is verified by test.
적분 가변구조제어기를 갖는 전기유압 서보시스템의 속도제어
허준영(J. Y. Huh) 유공압건설기계학회 2021 드라이브·컨트롤 Vol.18 No.4
The variable structure controller is designed such that in sliding mode, the system moves along the switching plane in the vicinity of the switching plane, thus it is robust because it is not affected by the parameter fluctuations of the plant. However, a controller based on a variable structure may not meet the desired performance when it is commanded to track any input or is exposed to disturbances. This study proposes a sliding mode controller that follows the IVSC (Integral Variable Structure Control) approach with ELO (Extended Luenberger observer) to solve this problem. The proposed sliding mode control is applied to the velocity control of the hydraulic motor. The sliding plane was determined by the pole placement, and the control input was designed to ensure the existence of the sliding mode. The feasibility of modeling and controller are reviewed by comparing with conventional proportional-integral control through computer simulation using MATLAB software and experimenting on the cases of significant plant parameter fluctuations and disturbances.