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김수원(Soo-Won Kim),박무룡(Moo-Ryong Park),황순찬(Soon-Chan Hwang),오형우(Hyoung-Woo Oh),윤의수(Eui-Soo Yoon) 한국유체기계학회 2002 유체기계 연구개발 발표회 논문집 Vol.- No.-
A mini turbo-pump having 44 ㎜ diameter impeller for hydraulic power control have been tested to evaluate hydraulic performance and losses. The characteristics of the losses such as mechanical, friction, balancing rib losses were investigated. The investigation revealed that the friction loss is relatively large but the balancing rib loss small. It was found that the hydraulic efficiency of the pump at design point is very low(27%) due to low specific speed and large friction losses. A computational fluid dynamics(CFD) method also has been utilized for performance prediction of the mini turbo-pump to compare the computed results with the test data.
A Development of a Software Tool for Automatic SCF Design
이상원,김용섭,김성원,강욱,김수원,김덕진,Lee, Sang-Won,Kim, Yong-Seop,Kim, Seong-Won,Kang, Wook,Kim, Soo-Won,Kim, Duck-Jin The Institute of Electronics and Information Engin 1990 전자공학회논문지 Vol.27 No.4
A software tool implementing cascaded SCF (Switched Capacitor Filter) is developed. A comprehensive procedure is described for the design of cascaded SCF, and some design considerations are discussed. In program several user-selectable filter approximation techniques, and two optimising methods which reduce the total capacitance are included. Analysis of the partial positive feedback and the effect of clock frequency to total capacitance are presented in detail. Two pratical examples are given to prove its validity in reducing the total capacitance. Developed tool can be used for general SCF generator.