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Citation:
　Amrit Shankar Verma,Zhiyu Jiang,Zhengru Ren,et al.Effects of Wind-Wave Misalignment on a Wind Turbine Blade Mating Process: Impact Velocities, Blade Root Damages and Structural Safety Assessment[J].Journal of Marine Science and Application,2020,(2):218-233.[doi:10.1007/s11804-020-00141-7]
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Effects of Wind-Wave Misalignment on a Wind Turbine Blade Mating Process: Impact Velocities, Blade Root Damages and Structural Safety Assessment

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Title:
Effects of Wind-Wave Misalignment on a Wind Turbine Blade Mating Process: Impact Velocities, Blade Root Damages and Structural Safety Assessment
Author(s):
Amrit Shankar Verma1; 2; 3;  Zhiyu Jiang4;  Zhengru Ren1; 2;  Zhen Gao1; 2;  Nils Petter Vedvik5
Affilations:
Author(s):
Amrit Shankar Verma1; 2; 3;  Zhiyu Jiang4;  Zhengru Ren1; 2;  Zhen Gao1; 2;  Nils Petter Vedvik5
1 Department of Marine Technology, Norwegian University of Science and Technology(NTNU), Trondheim, Norway;
2 Centre for Marine Operations in Virtual Environments(SFI MOVE), NTNU, Trondheim, Norway;
3 Faculty of Aerospace Engineering, Delft University of Technology(TU Delft), 2629 HS Delft, Netherlands;
Keywords:
Wind turbine blade; Wind-wave misalignment; Monopile; Marine operation; Finite element analysis; T-bolt connections
分类号:
-
DOI:
10.1007/s11804-020-00141-7
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.

References:

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Memo

Memo:
Received date:2019-01-29;Accepted date:2019-08-28。
Foundation item:The study is a part of SFI MOVE projects funded by the Research Council of Norway, NFR project number 237929.
Corresponding author:Amrit Shankar Verma,amrit.s.verma@ntnu.no
Last Update: 2020-11-07