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신평호(Pyungho Shin),성재용(Jaeyong Sung),이석종(Sukjong Lee) 한국가시화정보학회 2008 한국가시화정보학회지 Vol.6 No.1
The present study has focused on the characteristics of droplet formation from an inkjet nozzle driven by a piezoelectric actuator. As an operating fluid, ethylene glycol was used and the physical properties of it such as viscosity, surface tension, contact angle and shear stress were measured. During the experiments, various temperatures and driving voltages are imposed on a capillary tube. These conditions result in a proper drive condition or an overdrive condition. In case of the proper drive condition, an image processing technique is applied to measure the diameter of a single free drop. As a result, the size of droplet is increased when the driving voltage is increased from 160 V to 190 V at 25℃. In the overdrive condition where temperature or driving voltage becomes higher than the proper drive condition, satellites and the misdirected jets happen.
2 MW 영구자석 직접 구동형 부유식 스파 부이 풍력 발전기의 피칭 운동해석
신평호(Pyungho Shin),경남호(Namho Kyong),최정철(Jungchul Choi),고희상(Heesang Ko) 한국태양에너지학회 2017 한국태양에너지학회 논문집 Vol.37 No.1
A series of coupled time domain simulations considering stochastic waves and wind based on five 1-h time-domain analyses are performed in normal operating conditions. Power performance and tower base Fore-Aft bending moment and pitching motion response of the floating spar-buoy wind turbine with 2 MW direct-drive PMSG have been analyzed by using HAWC2 that account for aero-hydro-servo-elastic time domain simulations. When the floating spar-buoy wind turbine is tilted in the wind direction, maximum of platform pitching motion is close to 4°. Statistical characteristics of tower base Fore-Aft bending moment of floating spar-buoy wind turbine are compared to that of land-based wind turbine. Maximum of tower base Fore-Aft bending moment of floating spar-buoy wind turbine and land-based wind is 94,448 kNm, 40,560 kNm respectively. This results is due to changes in blade pitch angle resulting from relative motion between wave and movement of the floating spar-buoy wind turbine.
신평호,성재용,이석종 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
The present study focused on the characteristics of the droplet formation from an inkjet nozzle driven by a piezoelectric actuator. As an operating fluid, ethylene glycol was used and the physical properties of it such as viscosity, surface tension, contact angle and shear stress were measured. During the experiments, various temperatures and driving voltages imposed on a capillary tube are tested, which may result in a proper drive or a overdrive condition. In case of the proper drive condition, an image processing technique is applied to measure the diameter of a single free drop. As a result, the size of droplet is increased when the driving voltage is increased from 160 V to 190 V at 25℃. In the overdrive condition that temperature or driving voltage becomes higher than the proper drive condition, satellites and the misdirected jets happen.
성재용,이석종,신평호 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
In this paper we describe an experimental method and an image processing technique for detecting the position of a meniscus in the micro capillary flows. The flow times of the meniscus in both cases of the ethylene glycol and glycerine were evaluated at the same temperature and position from the entrance of capillary tube. Physical properties of ethylene glycol and glycerine such as viscosity, surface tension, contact angle, which significantly impact on capillary force, were measured. As a result, it was found that a big change of viscosity and contact angle strongly influenced on the flow time inside the micro capillary tube.