Abstract
Formulation of the governing nonlinear equations of motion for the coupled rotor/tower dynamics of a large two-bladed horizontal axis wind turbine (HAWT) is presented. Each blade has elastic flap and lead-lag bending deflections and the supporting tower has bending-bending-torsion deflections. Rotor/tower coupling is accomplished by enforcing dynamic equilibrium between the rotor and the top of the tower. The nonlinear periodic coefficient equations of motion are used to study aeroelastic stability and response of the NASA/DOE 100 kW Mod-O wind turbine. The influence of the flexible tower and nonlinear terms on rotor stability is examined. Isolated rotor blade behavior is compared to the complete coupled rotor/tower system and the basic differences are identified. It is concluded that for high tower stiffness, the aeroelastic response is primarily dependent on isolated rotor forcing, yaw mechanism flexibility, and tower shadow effect. It is also shown that rotor stability can be improved by tuning the support system stiffness.
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