Abstract
Two-bladed wind turbines are noticed because of reducing nacelle's weight on multi megawatt wind turbine size. However, two-bladed wind turbines have some issues such as increasing fatigue load and noise. Increasing noise is not so important when installing wind turbines in a sea area. So, to implement larger size of off-shore wind turbines, reducing fatigue load is important. As one of the methods that reduce fatigue load, a teetered-hub is noticed. A teetered-hub enables blades to rotate on a central axis of the hub like a seesaw. By this movement, the difference of aerodynamic load between two blades is balanced. In this study, blades behavior of teeter axis circumference and a blade root bending moment are analyzed by AIST-Realtime Aeroelastic Model (AIST-RAM). AIST-RAM is derived by Lagrange's method on Euler's coordinate system and is coded by The National Institute of Advanced Industrial Science and Technology using MATLAB/Simulink. By comparing AIST-RAM result with wind tunnel test result, confirming the validity of AIST-RAM.
