TY - JOUR
T1 - Effects of Wind-Wave Misalignment on a Wind Turbine Blade Mating Process
T2 - Impact Velocities, Blade Root Damages and Structural SafetyAssessment
AU - Verma, Amrit Shankar
AU - Jiang, Zhiyu
AU - Ren, Zhengru
AU - Gao, Zhen
AU - Vedvik, Nils Petter
PY - 2020
Y1 - 2020
N2 - 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.
AB - 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.
KW - Finite element analysis
KW - Marine operation
KW - Monopile
KW - T-bolt connections
KW - Wind turbine blade
KW - Wind-wave misalignment
UR - http://www.scopus.com/inward/record.url?scp=85091681390&partnerID=8YFLogxK
U2 - 10.1007/s11804-020-00141-7
DO - 10.1007/s11804-020-00141-7
M3 - Article
AN - SCOPUS:85091681390
SN - 1671-9433
VL - 19
SP - 218
EP - 233
JO - Journal of Marine Science and Application
JF - Journal of Marine Science and Application
IS - 2
ER -