About Wind turbine blades hitting the tower
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6 FAQs about [Wind turbine blades hitting the tower]
Why do wind turbine blades fail?
Multiple requests from the same IP address are counted as one view. A review of the root causes and mechanisms of damage and failure to wind turbine blades is presented in this paper. In particular, the mechanisms of leading edge erosion, adhesive joint degradation, trailing edge failure, buckling and blade collapse phenomena are considered.
How do wind turbine rotors reduce the risk of Tower strike?
As wind turbine rotors become larger, the blades become more flexible, requiring extra stiffness and cost to avoid the risk of tower strike. Wind turbines in a downwind configuration have a reduced risk of tower strike because the rotor thrust acts away from the tower.
How to prevent wind turbine collapse?
Wind turbine collapse case analyses in Section 4 reveal that most locations of failure of wind turbines are in the middle-lower part of the tower. Therefore, tower bolts in these locations should be improved first. The strength or number of bolts can be increased to strengthen wind turbine towers. “Pitch system failure” had a medium risk level.
Where do wind turbines collapse?
According to the results, 87% of the collapsed wind turbines collapsed when the wind speed was at least 60 m/s, and 81% of the collapses occurred between the foundation and one third of the height of the wind turbine tower. The above result reveals that the primary location of failure of a wind turbine tower is in the lower part of the tower.
What happens when wind turbine blades are feathered?
Related analyses have indicated that at a wind speed of 50 m/s, the bending moment that is experienced by wind turbine towers when wind turbine blades are in a feathered state (blade parallel to the wind) is almost halved. Wind turbine towers under excessive stress may suffer from wall buckling, tower bolt fractures, and foundation overturn.
Can a pitch system collapse a wind turbine tower?
Therefore, failure of a pitch system may cause a chain reaction that results in collapse of the wind turbine tower. Risk matrix analyses were performed; probability and consequence were used to elucidate the potential risk associated with each collapsing factor.
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