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원자력 터빈-발전기의 베어링 지지 시스템과 운전조건에 따른 진동특성 고찰
고우식(W. S. Ko) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
In the present study, the root cause analysis has been performed to solve hunting and high vibration problem during rated power operation of large turbine-generator in nuclear power plant. The hunting and high vibration above alarm limit is related and sensitive to bearing support system. In case of isolated bearing pedestal from turbine casing or generator casing, vibration phenomena is very much stable regardless operating conditions such as condenser vacuum and generator hydrogen pressure. But in case of bearing support system installed in casing of low pressure turbine or generator casing(end bracket), vibration is hunting and used to be over alarm limit according to operating conditions. The result of this study concluded that hunting and high vibration come from lowered bearing stiffness due to partial contact between bearing ballseat and support according to deformation of casing when operating conditions such as condenser vacuum pressure or generator hydrogen pressure are changed.
설계유량을 고려한 천음속 축류압축기 동익의 삼차원 형상최적설계
고우식(Woo-Sik Ko),김광용(Kwang-Yong Kim),고성호(Sung-Ho Ko) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
Design optimization of a transonic compressor rotor (NASA rotor 37) using response surface method and three-dimensional Navier-Stokes analysis has been carried out in this work. Baldwin-Lomax turbulence model was used in the flow analysis. Two design variables were selected to optimize the stacking line of the blade, and mass flow was used as a design variable, as well, to obtain new design point at peak efficiency. Data points for response evaluations were selected by D-optimal design, and linear programming method was used for the optimization on the response surface. As a main result of the optimization, adiabatic efficiency was successfully improved, and new design mass flow that is appropriate to an improved blade was obtained. Also, it is found that the design process provides reliable design of a turbomachinery blade with reasonable computing time.
전자기력을 고려한 플라이휠 에너지 저장시스템용 전동발전기 구조해석
고우식(W.S.Ko),류동완(D.W.Ryu),오시덕(S.D.Oh),성태현(T.H.Seong),한상철(S.C.Han),한영희(Y.H.Han) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Flywheel Energy Storage System(FESS) consists of a high speed flywheel with an integral motor/generator suspended on non contact bearings and in an evacuated housing. Permanent magnet machines as the FESS motor/generator are a popular choice, since there are no excitation losses which means substantial increase in the efficiency. In this paper, the structural design method of rotor retainer for a high speed motor/generator are presented.
Central Ventilation Fan Blade 손상원인의 고찰
구재량(Koo-Jae Raeyang),고우식(Ko-Woo Sig),김연환(Kim-Yeon Hwan),박광하(Park-Kwang Ha) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
During the operation, Central ventilation fan stopped when switch on condition. When central ventilation fan disassemble, ten blades of fan fractured. We have searched cause of failure. We bad modeling one of the fan blades and analysis with computer programs. Thus We have find that fracture of central ventilation fan blades is alternative stress and vibration at hub. In this paper, We have described cause of failure.