장착각 및 테이퍼비를 갖는 회전하는 풍력 터빈 블레이드 시스템의 중력을 고려한 안정성 해석

초록

Dynamic stability of wind turbine blade system considering gravity effects is investigated in this paper. Equations of motion for the wind turbine composed of a hub and three coupled blades are derived by employing hybrid deformation variable method and transformed into dimensionless form. Every blade has cross section taper, pre-twisted angle and setting angle. Stability contour graphs are presented to show the influence on stability according to the change of the properties of wind turbine blade and angular velocity. Since the stiffness of blade is changed when it is rotating, it is found that relatively large unstable regions exist around 1.1 times to the first bending natural frequency.