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전류정보를 이용한 가변속냉동시스템의 응축기 오염 On-line 고장진단
이동규(D. G. Lee),고대권(D. K. Koh),정석권(S. K. Jeong) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In this paper, on-line fault detection and diagnosis(FDD) of condensor fouling in a variable speed refrigeration system based on current information is introduced. An inverter and feedback control are essential to a variable speed refrigeration system for energy saving. RPM of a compressor and opening angle of an electronic expansion valve are changed by feedback control. Hence, pressure and temperature information for on-line FDD are insufficient due to compensation effect of the feedback control. Therefore this paper suggests utilization of the current information which is measured from an inverter for FDD. First, experimental equipment and method of data collection for regression analysis about the current information are represented. Then a regression equation about the current information is generated. Next, we show that the pressure and temperature information are insufficient due to compensation effect of feedback control. Finally, usefulness of the residual information between detected current and estimated current based on the regression equation is verified through some experiments.
이동규(D. G. Lee),윤종수(J. S. Yoon),이상호(S. H. Lee),금종수(J. S. kum),정석권(S. K. Jeong) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This paper deals with fuzzy controller design for ventilation control of tunnel. The design for ventilation control of tunnel basically requires nonlinear control because of many irregular factors of the tunnel. Therefore, fuzzy control as nonlinear controller is usually applied to the tunnel system which has nonlinear characteristics. First, basic fuzzy principles are explained, and fuzzy controller for tunnel ventilation is designed supposing that normal traffic flow by using the fuzzy principle. In general, both carbon monoxide and exhaust gas are considered as control quantities in the ventilation control. However, we just considered only exhaust gas as control quantity because exhaust gas is more important control factor than carbon monoxide. Next, we investigated unexpected traffic jam which may be caused in tunnel right after tunnel open. The abnormal traffic makes worse pollution concentration in tunnel. A spare controller is prepared to cope with the problem. Finally, some simulation results showed good control performance.