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고장욱(Koh, Jang-Wook),김향기(Kim, Hyang-Ki),안경민(Ahn, Kyoung-Min),최원호(Choi, Won-Ho) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
Performed fatigue strength analysis for Hub to get the targeted service life of 20 years. ANSYS is used to analysis. The major structure of bearing which connect the hub and blades is modeled using the element of LINK10. To represent the stiffness of LINK10 element, initial strain and diameter of LINK10 element is applied. Prior to calculating the fatigue damages, the influence matrix is extracted from the unit loads. The target service life of 20 years is achieved from the Analysis results.
이현주(Hyun Joo LEE),고장욱(Jang Wook KOH),오시덕(Si Doek OH) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
A wind turbine obtains its power input by converting the force of the wind into a torque (turning<br/> force) acting on the rotor blades. The amount of energy which the wind transfers to the rotor depends<br/> on the density of the air, the rotor area, and the wind speed. Because it has long term operating life<br/> and very complex load condition, the fatigue strength of each component must be considered. In this<br/> paper, we calculated the load condition by wind using a combined blade elemental theory and a FEM<br/> based analytical approach was use to evaluate the fatigue strength of a Hub of wind turbine. The<br/> effect of tensile mean stress was taken into account by the modified Goodman diagram. Using this<br/> approaches, we evaluated the fatigue strength of hub and main shaft and improved the design.
이현주(Hyun Joo LEE),고장욱(Jang Wook Koh) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.10
Wind turbine is one of the efficient and clean renewable energy. Because it has long term operating life and very complex load condition, the fatigue strength of each component must be considered. In this paper, we calculated the wind load condition using a combined blade elemental theory and a FEM based analytical approach was use to evaluate the fatigue strength of a Tower of wind turbine. The effect of tensile mean stress was taken into account by the modified Goodman diagram. Using these approaches, we evaluated the fatigue strength of Tower.
Wind Turbine Tower의 Door 용접부에 대한 피로 강도 연구
한동영(Han, Dong-Young),고장욱(Koh, Jang-Wook),최원호(Choi, Won-Ho),이승구(Lee, Seung-Kuh) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
Recently, as the global warming by fossil fuels become social issues. the interest of renewable energy producing system is increasing rapidly. Among these, wind turbines are most highlighted because of its economic competitiveness. The tower occupying about 20% of overall turbine costs, is one of the main components of wind turbine. Tower access door located to base part of the tower, is used to enter the tower. This is the main structural weak point because of door hole, weldment, etc. In this study, by FEM, we retrieved the maximum van Mises stress at door location and carried out fatigue analysis using stresses at weld toe locations of tower access door part.