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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.
공극에 따른 유도전동기의 전자기 특성 변화 추이에 관한 FEM해석
김기수(Ki-Soo Kim),조진래(Jin-Rae Cho),고우식(Woo-Sik Ko) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The main noise source of an induction moter is the stator vibration caused by electromagnetic force. Almost electromagnetic excitations of the stator are generated near the air-gap. This paper investigates the variation of electromagnetic force to air-gap tolerance in induction motor. The electromagnetic force and the excitation-torque are computed and examined. This study provides the qualitative guideline for the vibration/noise reduction design. We use the finite element method because the electromagnetic force prediction to the air-gap change is difficult. The numerical results slow that electromagnetic charaticteristics are strongly influenced by the air-gap tolerance.