ティータハブつき風車の定常応答 : 5自由度解析

概要

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A mathematical five-degrees-of-freedom model is presented to describe the approximate behaviors of horizontal-axis wind turbine generators with teetered rotor blades. Taking as unknown the teeter rotation, flap defection of the two blades, pitching rotation and yawing rotation of the nacelle, we employed an energy approach to derive Lagrange's equation of motion. Quasi-steady blade element strip theory was applied to evaluate aerodynamic forces on the teetered rotor blades upwind or downwind of the tower, taking boundary-layer shear wind and wind speed reductions due to the tower shadow into account. Numerical solutions for steady-state responses show that the downwind rotor undergoes heavier oscillations than the upwind rotor, and that the aerodynamic damping force due to teetering compensates for most of the imbalances in bending moments at each upwind rotor blade root.
一般社団法人日本機械学会の論文
1989-11-25