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퍼지-뉴럴 제어기를 이용한 스위치드 리럭턴스 전동기의 속도 제어에 관한 연구
박지호(J.H.PARK),김건우(k.W.KIM),김연충(Y.C.KIM),원충연(C.Y.WON),김창림(C.L.KIM),최경호(K.H.CHOI) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
In this paper, an auto-tuning method for fuzzy controller based on the neural network is presented. The backpropagated error of neural emulator offers the path which reforms the fuzzy controller's membership functions and fuzzy rule, and used for speed control of switched reluctance motor. The experiments are performed to verify the capability of proposed control method on 6/4 salient type SRM. The results show that fuzzy-neural controller is suitable for wide speed range.
박지호(J.H. Park),정기영(K.Y. Jung),명노신(R.S. Myong) 한국전산유체공학회 2013 한국전산유체공학회지 Vol.18 No.3
A significant change in aerodynamic characteristics of wind turbine blade can occur by ice formed on the surface of the blade operated in cold climate. The ice accretion can result in performance loss, overloading due to delayed stall, and excessive vibration associated with mass imbalance. In this study, the impact of ice accretion on the aerodynamic characteristics of NREL 5MW wind turbine blade sections is examined by a CFD-based method. It is shown that the thickness of ice accretion increases from the root to the tip and the effects of icing conditions such as relative wind velocity play a significant role in the shape of ice accretion. In addition, the computational results are used to assess the degradation in the lift and drag coefficients of the blade sections.
풍력 블레이드의 표면발생 결빙에 의한 공력 영향성 전산 예측
박지호(J.H. Park),안국빈(G.B. Ahn),정기영(K.Y. Jung),명노신(R.S. Myong) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
A significant change in aerodynamic characteristics can occur by ice accretion on the surface of wind, turbine blade due to low temperature in cold climate. In particular, it will result in the loss in electricity production through a negative influence on lift and drag. In this study, the impact of ice accretions on the aerodynamic characteristics of wind, turbine blade sections is examined by computational methods. It is shown that the thickness of ice accretion increase and the lift-to-drag ratio decrease from the root to the tip.
Dynamic Intake 장착 헬기 공기흡입구의 결빙 증식 전산 예측
박지호(J.H. Park),박지환(J.H. Park),명노신(R.S. Myong),김기현(K.H. Kim) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
A significant change in engine performance and propulsive characteristics can occur by ice accretion on the surface of helicopter engine intake. In order to analyze those icing effects, a physics-based icing simulation using the CFD methods can be used prior to the exact but very expensive icing wind tunnel or in-flight tests. In this study, the impact of ice accretions on the dynamic intake type helicopter is examined in detail. An analysis is carried out for a forward flight after neglecting the effect of down-wash in the rotor for the sake of simplicity. As a result, the location of major iced areas such as the engine intake and the amount of ice accretion are identified.
CFD 및 BEM 기법을 이용한 풍력 블레이드의 결빙에 의한 공력특성 변화 전산 예측
박지호(J.H. Park),안국빈(G.B. Ahn),정기영(K.Y. Jung),명노신(R.S. Myong) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
A significant change in aerodynamic characteristics can occur by ice accretion on the surface of wind turbine blade due to low temperature in cold climate. In particular, it will result in the loss in electricity production through a negative influence on lift and drag. In this study, the impact of ice accretions on the aerodynamic characteristics of wind turbine blade sections is first investigated. The results are then used to predict 3D aerodynamic characteristics of wind, turbine blade through the blade element momentum method. It is shown that the thickness of ice accretion increase and the lift-to-drag ratio decrease from the root to the tip, and, as a result, the power coefficients decrease significantly.