Nonlinear Aeroelastic Modeling and Analysis of Flexible Wind Turbine Blades

In this paper, dynamic responses of large-span wind turbine blades will be modeled in a nonlinear aeroelastic framework. A strain-based geometrically nonlinear beam formulation will be used for the basic structural dynamic modeling, which will be coupled with unsteady aerodynamic equations and rigid-body rotations of the rotor. Full wind turbines can be modeled by using the multi-connected beams. With the aeroelastic framework, dynamic behavior of NREL’s 5MW wind turbine blades will be studied and correlated with available numerical data. The current work will be the basis of the authors’ further studies on flow control and hazard mitigation on wind turbine blades and towers.

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