http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
양천석(Chun-Suk Yang),윤인식(In-Sik Yoon),김경서(Kyung-Seo Kim) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
This paper describes the design, construction and implementation of matrix converter based on space vector modulation technique. The matrix converter provides sinusoidal input and output wave forms, bidirectional power flow, controllable input power factor and a compact design, compared to the VSI with diode rectification stage at the input. The implemented prototype of matrix converter is built using the exclusive IGBT module and has an input filter, overvoltage protection circuit and commutation means for overcoming practical issues. The good results tested using an induction motor are also presented.
100 ㎾ 급 다단 원심펌프 성능 개선을 위한 임펠러 및 디퓨저 블레이드의 형상 최적화
박세진(Se-Jin Park),김주한(Joo-Han Kim),이명성(Myungsung Lee),윤인식(In-Sik Yoon) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
In this study, shape optimization was performed by changing the blade angles of the impeller and diffuser, which are key components of a 100 kW multi-stage centrifugal pump. The specifications of the initial model of the impeller are 135.6 m of head at 250 ㎥/h of flow rate, 3600 r/min of revolution, and 187 ㎜ of impeller outer diameter. Using ANSYS BladeGen, the shape was regenerated to enable blade coordinate data and angle change, and flow analysis was performed with ANSYS CFX. Discrete Latin Hypercube Design (DLHD) and Sequential Approximate Optimization (SAO) were applied as shape optimization techniques. Efficiency was set to the maximum as the design objective condition, and optimization was performed by minimizing the shaft power as the constraint condition. Compared to the initial model, the optimized model was found to increase head by 8.57%, axial power by 7.13%, and efficiency by 1.35% at a flow rate of 250 ㎥/h.
이덕구(Deok-gu Lee),김영범(Young-bum Kim),윤인식(In-sik Yoon),황지혁(Ji-hyuck Hwang),권갑주(Gap-ju Kwon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The conventional control valves have been used at the locations occurring high differential pressure and high temperature which causes cavitation, flashing, severe vibration due to abrupt flow change, and sudden pressure drop. Previous studies concerning control valves focused to prevent damage of valve trim due to the internal leak and low flow rate. The newly designed helical trim of control valve has been installed at the location of high pressure change and high temperature in a power plant, and operated for evaluation. It is confirmed that the new control valve developed in this study generates flow characteristics in comparison with previous helical trim of control valves.