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양현석,김환성,김정훈,김상봉,김종수,Yang, H.S.,Kim, H.S.,Kim, J.H.,Kim, S.B.,Kim, J.S. 대한설비공학회 1993 설비공학 논문집 Vol.5 No.2
Recently, efforts of decreasing energy consumption are continously increased and user's preference is also diversified in refrigeration and air conditioning systems. Thus, in order to satisfy these demands, high efficiency, high intelligence, and energy saving for those systems are essential. As the basic study for diverse functions and intelligence of those systems, we investigated the response characteristics through the compressor capacity control concerned with superheat and refrigeration room temperature. And, response characteristics are investigated experimentally by using micro computer based PWM inverter control method. Experimental result of the conventional on-off control method is given in order to be compared to the results of inverter control method. The results obtained through this study are summarized as follows. It is shown from the experimental results of the on-off control method that the range of temperature variation around the steady state ($-18^{\circ}C$) is very large (about $7{\sim}8^{\circ}C$) and the settling time bringing the steady state is not found. In the inverter control method, we can see that the refrigeration room temperature after reaching the setting temperature is very stable without fluctuation and a robust control for disturbance such as opening the door has been realized.
유연 매체에 적용 가능한 Bimorph PZT 구동기의 설계 및 제어
심현재 ( H. J. Shim ),황현우 ( H. W. Hwnag ),박노철 ( N. C. Park ),양현석 ( H. S. Yang ),박영필 ( Y. P. Park ) 정보저장시스템학회 2005 추계학술대회논문집 Vol.2005 No.-
Nowadays, various approaches are performed to increase the storage capacity of optical storage device. One of the promising candidates is using the high NA lens. By using high NA lens, the beam spot size can be reduced which will lead to increase the storage density. This paper proposes a double cantilever beam type bimorph PZT actuator for fine motion that can control the gap between the flexible media and optical pickup which uses high NA lens. Mathematical model is derived by using Hamilton``s principle and the model is verified by finite element analysis and experiment. Position controller is designed and its performance is evaluated by experiment.