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Effects of Wind-Wave Misalignment on a Wind Turbine Blade Mating Process

Impact Velocities, Blade Root Damages and Structural SafetyAssessment

Journal Article (2020)
Author(s)

Amrit Shankar Verma (TU Delft - Aerospace Manufacturing Technologies, Norwegian University of Science and Technology (NTNU))

Zhiyu Jiang (University of Agder)

Zhengru Ren (Norwegian University of Science and Technology (NTNU))

Zhen Gao (Norwegian University of Science and Technology (NTNU))

Nils Petter Vedvik (Norwegian University of Science and Technology (NTNU))

Research Group
Aerospace Manufacturing Technologies
Copyright
© 2020 Amrit Shankar Verma, Zhiyu Jiang, Zhengru Ren, Zhen Gao, Nils Petter Vedvik
DOI related publication
https://doi.org/10.1007/s11804-020-00141-7
More Info
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Publication Year
2020
Language
English
Copyright
© 2020 Amrit Shankar Verma, Zhiyu Jiang, Zhengru Ren, Zhen Gao, Nils Petter Vedvik
Research Group
Aerospace Manufacturing Technologies
Issue number
2
Volume number
19
Pages (from-to)
218-233
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Abstract

Most wind turbine blades are assembled piece-by-piece onto the hub of a monopile-type offshore wind turbine using jack-up crane vessels. Despite the stable foundation of the lifting cranes, the mating process exhibits substantial relative responses amidst blade root and hub. These relative motions are combined effects of wave-induced monopile motions and wind-induced blade root motions, which can cause impact loads at the blade root’s guide pin in the course of alignment procedure. Environmental parameters including the wind-wave misalignments play an important role for the safety of the installation tasks and govern the impact scenarios. The present study investigates the effects of wind-wave misalignments on the blade root mating process on a monopile-type offshore wind turbine. The dynamic responses including the impact velocities between root and hub in selected wind-wave misalignment conditions are investigated using multibody simulations. Furthermore, based on a finite element study, different impact-induced failure modes at the blade root for sideways and head-on impact scenarios, developed due to wind-wave misalignment conditions, are investigated. Finally, based on extreme value analyses of critical responses, safe domain for the mating task under different wind-wave misalignments is compared. The results show that although misaligned wind-wave conditions develop substantial relative motions between root and hub, aligned wind-wave conditions induce largest impact velocities and develop critical failure modes at a relatively low threshold velocity of impact.