Abstract
Edgewise vibration of a three-bladed Horizontal-Axis Wind Turbine (HAWT) under the action of operational loads and seismic ground motions is presented in this paper. The turbine model describes the dynamics of edgewise vibrations considering the aerodynamic properties of the blade, variable mass and stiffness per unit length and taking into account the effect of centrifugal stiffening, gravity and the interaction between the blades and the tower. Aerodynamic loads corresponding to a combination of steady wind including the wind shear and the effect of turbulence are computed by applying the modified Blade Element Momentum (BEM) theory. An edgewise reduced order model is adopted where each blade is modeled as a Bernoulli–Euler cantilever beam vibrating in its fundamental mode. The seismic load is contributed by ground motion due to earthquakes simulated as stochastic processes. In the case study presented for a 5MW National Renewable Energy Laboratory (NREL) wind turbine, the influence of seismic excitations on the vibration of the blades and the nacelle is investigated.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
