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유전 알고리즘을 이용한 매입형 영구자석 동기전동기의 최적 설계
조동혁(D. H. Cho),심동준(D. J. Sim),천장성(J. S. Chun),정현교(H. K. Jung) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.4
Air gap flux density and d, q axis inductances of the Interior Permanent Magnet Synchronous Motor obtained by equivalent magnetic circuit method are compensated using results from Finite Element Method. For optimal design, the efficiency of the motor is taken as the objective function, and Genetic Algorithm finds the value of design parameters which maximize the objective function. The result of optimal designed motor is examined by comparison with proto-type motor.
조동혁(Cho, D.H.),황상연(Hwang, S.Y.),조성호(Cho, S.H.),이인우(Lee, I.W.),이승구(Lee, S.K.) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
This paper presents a design approach for wind power generator. Among several different generator systems, doubly-fed induction generator(DFIG) is selected for Hyosung 2MW wind turbine system from the view of cost and weight. The time step finite element method is applied to analyze the performance of DFIG, and design of experiment(DOE) is used as an optimization method.
나선 그루브형 열사이폰의 작동유체의 변화에 대한 응축열전달 성능에 관한 연구
한규일(K.I.Han),조동혁(D.H.Cho),박종운(J.U. Park),이상진(S.J.Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
This study concerns tile performance of condensing heat transfer in two-phase closed thenl1osyphons with various helical grooves. Distilled water, methanol, ethanol have been used as the working fluid. In the present work, a copper tube of the length of 1200mm and 14.28nml of inside diameter is lISed as the container of the thermosyphon. Each of the evaporator and the condenser section has a lengtl1 of 55Orrun, wltile the remaining part of the thelmosyphon tube is adiabatic section. A experimental study was canied out for analyzing tIle pe:1iormances of having 50, 50, 70, 80, 90 helical grooves. A plrtin thennosyphon having tile same inner and outer diameter as ilie grooved iliennosyphons is also tested for the comparison. The type of working fluid and the numbers of grooves of the tllennosyphons with vmious helical grooves have been used as the expelirnental parameters. The expelimental results have been assessed and cornpm'ed with existing theories. The results show tlmt tJle type of working fluids are very imporumt factors for tlle operation of tl1ennosyphons. And the maximum enhancement (i.e. the ratio of the heat transfer coefficients tJle helical tlu~nnosyphons to plain tl1ermosyphons) is 1.5- 2 for condensation.