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부유식 진자형 파력발전 시스템의 유압회로 설계에 관한 기초적 연구
김현호(H. H. Kim),이일영(I. Y. Lee),신승호(S. H. Shin),최종수(J. S. Choi),천호정(H. J. Cheon),김재환(J. H. Kim) 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.10
The Hydrostatic transmission (HST) converts the reciprocal power into continuous power as the device involved the ocean waver energy converter (OWEC). This paper suggests a simulation model for the hydrostatic transmission (HST). Simulation and experimental results are compared with each other. And the validity of the simulation model is verified. Though the suggested simulation model, basic study is performed for the circuit design of HST.
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.
TLC를 이용한 경사진 사각밀폐공간에서의 자연대류에 관한 정량적 가시화 실험 및 수치해석
김현호(H. H. Kim),배대석(D. S. Bae),김남식(N. S. Kim),권오봉(O. B. Kwon) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In this study, simultaneous quantitative measurements are made of both the temperature and velocity fields for natural convection in an inclined rectangular enclosure using TLC(Thermo-sensitive Liquid Crystal). The temperature is measured using neural network and color-image processing technique, and the velocity is measured using PIV. The numerical results are obtained in the same conditions as experiments by the finite volume method and its results are compared with experimental results. It is found that the number of cell is decreased with increasing the angle of inclination, and a unicell is formed at nearby θ=30°. Averaged Nusselt number is observed to decrease as angle of inclination increases in the region of 0≤θ≤30 and to increase as angle of inclination increases in the region of 30≤θ≤45.
김현호(H. H. Kim),허준영(J. H. Huh),이일영(I. Y. Lee) 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.6
Many researchers have studied for improving the control performance of electric hydrostatic actuator(EHA), but studies are limited to improve the characteristics of transient response such as a step response. In this study, ISF-FF-PI-D controller is proposed for the position control of EHA in the high frequency range. First, FF-PI-D control system is designed for compensation of disturbance input and improvement of target tracking performance. In addition, input shaping filter(ISF) is applied to prevent saturation of electric motor using FF-PI-D control system in the high frequency field. As the result, it is confirmed experimentally that target tracking performance of ISF-FF-PI-D control system is better than FF-PI-D control system in the high frequency range.