large scale assembly and erection of floating offshore wind turbines m.sc anders myhr
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Large Scale Assembly and Erection of Floating Offshore Wind Turbines M.Sc Anders Myhr M.Sc David W. Moss Prof. Tor Anders Nygaard European Offshore Wind, Stockholm 16.09.2009. Aquilo, the concept. Flexible and simple Minimize risk Horizontal assembly Reduce the number of vessels - PowerPoint PPT PresentationTRANSCRIPT
Large Scale Assembly and Erection of Floating Offshore
Wind TurbinesM.Sc Anders Myhr
M.Sc David W. Moss
Prof. Tor Anders Nygaard
European Offshore Wind, Stockholm
16.09.2009
Norw
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ersity
of Life
Scie
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Anders Myhr
Aquilo, the concept
Flexible and simple
Minimize risk Horizontal assembly
Reduce the number of vessels
and cranes during the operation
Optimized and developed for
turbines with single buoy floaters
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Development of model ANSYS finite element model of semisub-
platform, cradle and wind turbines
Platform setup: Metacentric height > 1 meter
Natural periods > 20 sec
Wave forces by Morrison’s Equation
Point pre-calculated wind force
Buoyancy
Gravity
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Time [s]
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Limits and assumptions
Operate during 90% of
North Sea weather conditions
Linear wave trains with a
significant wave height of 6m
Static wind field with a
speed of 36 m/s
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Wind speed [m/s]
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Turbine loads in horisontal position
Cantilever
Nacelle loads
Necessary length of Aquilo
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Length from tower base [m]
Length from tower base [m]
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Turbine loads in vertical position
Wind force
Wave force
Keel-effect
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Point forces [N]
Wind force [N/m]
Wave force [N/m]
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Loads during pivotation
Peak loads
Model errors
Wave slamming
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Horizontal position
Vertical position
During pivotation
Fatigue of the construction
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Evaluation
Assembly frequency
Investment cost
Flexibility
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Conclusion
The Aquilo concept should be a decent contender in future assembly and erection of offshore wind turbines.
The versatility for application on different assembly platforms are yet to be proven but should result in lesser dynamic response and loading on both the pivot cradle and turbine towers.
Further work:
More load combinations
Damping and Eigen-frequencies
Winches and anchor handling
Economics
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Anders Myhr
Thank you for your time.
For further information please contact me at: [email protected]
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