This paper is on parametric effect in large scale horizontal-axis wind turbine blades and speed locking phenomenon for a simplified model of an in-plane blade-hub dynamics of a HAWT. This work follows up a previous numerical study to analytically explain the speed locking phenomenon. Primary and secondary resonance cases are studied to verify the fact.  Besides, the effects of parametric stiffness are illustrated in this work. Parametric effect on actual and scaled-length blade tip placements are investigated for superharmonic resonances at order 2 and 3 and for tuned and mistuned blade cases.  Natural frequencies are found at different rotation angles to show the significance of the gravity's parametric effect. Also, the ratio of the parametric and elastic modal stiffnesses is estimated  for the scaled versions of the NREL’s blades for four models to present the relation between the blade size and the parametric effects.


Parametric Stiffness in Large-Scale Wind-Turbine Blades and the Effects on Resonance and Speed Locking

Division / Sponsors: 
Design Engineering Division and Computers & Information In Engineering Division


Paper Proceedings: https://asmedigitalcollection.asme.org/IDETC-CIE/IDETC-CIE2020/volume/83907

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