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Large Scale Assembly and Erection of Floating Offshore Wind Turbines M.Sc Anders Myhr

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

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Large Scale Assembly and Erection of Floating Offshore Wind Turbines M.Sc Anders Myhr

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  1. 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

  2. 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 Large Scale Assembly and Erection of floating Offshore Wind Turbines

  3. 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 Large Scale Assembly and Erection of floating Offshore Wind Turbines Heave amplitude [m] Time [s]

  4. 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 Height [m] Large Scale Assembly and Erection of floating Offshore Wind Turbines Wind speed [m/s]

  5. Turbine loads in horisontal position • Cantilever • Nacelle loads • Necessary length of Aquilo NJORD Stress [MPa] Large Scale Assembly and Erection of floating Offshore Wind Turbines Length from tower base [m] 5MW Hywind Stress [MPa] Length from tower base [m]

  6. Turbine loads in vertical position Wave force [N/m] • Wind force • Wave force • Keel-effect Depth [m] Large Scale Assembly and Erection of floating Offshore Wind Turbines Height [m] Point forces [N] Height [m] Wind force [N/m]

  7. Loads during pivotation • Peak loads • Model errors • Wave slamming Large Scale Assembly and Erection of floating Offshore Wind Turbines

  8. Fatigue of the construction • Horizontal position • Vertical position • During pivotation Large Scale Assembly and Erection of floating Offshore Wind Turbines

  9. Evaluation • Assembly frequency • Investment cost • Flexibility Large Scale Assembly and Erection of floating Offshore Wind Turbines

  10. 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 Large Scale Assembly and Erection of floating Offshore Wind Turbines

  11. Thank you for your time. • For further information please contact me at: myhr.anders@gmail.com Large Scale Assembly and Erection of floating Offshore Wind Turbines

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