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Analysis of economy and load effect of hybrid tower for wind turbine
이승민(Lee, Seunugmin),박현철(Park, Hyunchul),정진화(Chung, Chinwha),권대용(Kwon, Daeyong),김용천(Kim, Yongchun),Shi, Wei 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
With the development of wind industry, the rated power of wind turbine also increase gradually. Accordingly, the size of wind turbine tower becomes larger and larger. The tower base diameter of 2MW wind turbine is about 4m. Larger tower is expected for 4MW or 5MW turbine. Due to limitation of transportation, new type of tower with smooth transportation and effective cost is needed. In this work, a hybrid tower consisting of steel and concrete is designed and analyzed. The optimum ratio of steel and concrete of hybrid tower are calculated as well as the thickness of the concrete part. Different FE analysis including modal analysis, buckling analysis and fatigue analysis are performed to check the design of hybrid tower comparing with the steel tower. Redesign is also expected after various analysis.
A study on load evaluation and analysis for foundation of the offshore wind turbine system
권대용(Kwon, Daeyong),박현철(Park, Hyunchul),정진화(Chung, Chinwha),김용천(Kim, Yongchun),이승민(Lee, Seungmin),Shi, Wei 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
With growing of wind turbine industry, offshore wind turbine system is getting more attention in recent years. Foundation of the offshore wind turbine plays a key role in stability of whole system. In this work, 5MW NREL reference wind turbine with rated speed of 11.4m/s is used for load calculation. Wind loads and wave loads are evaluated using GH-Bladed (Garard Hassan) and FAST (NREL). Additionally, FE simulation is carried out to investigate the wave effect on the support structure. Meanwhile, this work is trying to systematize and optimize load cases simulation for foundation of wind turbine system.
PHOTO-NEUTRON SOURCE USING 2 GEV ELECTRON LINAC FOR RADIATION SHIELDING RESEARCH
Lee, Hee-Seock,Bak, Jooshik,Chung, Chinwha,Ban, Syuichi,Shin, Kazuo,Tatsuhiko, Sato 대한방사선 방어학회 2001 방사선방어학회지 Vol.26 No.3
The 2 GeV electron linac, the injector of the Pohang Light Source, was used as a photo-neutron source for radiation shielding research. The operational beam parameters are the nominal electron intensity of 0.5∼5 nC/sec, the repetition rate of 10 Hz, and the beam pulse length of 1.0 nsec. One electron beam line was modified in order to install the target systems for producing pulsed photo-neutrons. The neutron spectrum and intensity were investigated by the time-of-flight technique. The reliable maximum energy of the measured neutrons was about 500 MeV. The number of neutrons above 20 MeV produced by one 1 GeV electron in a thick Pb target was about 6.45 × 10-4 /sr at 90 degrees to the beam axis. The status of the photo-neutron source and the application research are presented.