1 MITIGATION OF ICE LOADING ON OFF-SHORE WIND TURBINES FEASIBILITY STUDY OF A SEMI-ACTIVE SOLUTION

• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Ice Sheet
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.603.2549; http://smart.ippt.gov.pl/dok/referaty/2005 Mitigation of ice loading on off-shore wind turbines, feasibility study of semi-active solution.pdf

impact load mitigation, semi-active control, conical structures, ice loading Abstract. This paper focuses on mitigation of dynamic loading induced on off-shore towers by drifting ice. Conical structures attached to off-shore towers at water level are widely used to reduce static and dynamic ice actions. The level of remaining forces is enough to cause severe tower vibrations and, in some situations also self induced excitation. A need for an additional device to reduce the remaining actions is recognized. Present study introduces a new, compliant connection between the cone and the tower. Parameters of the connection are controlled semi-actively to optimize the effect. Numerical studies are made to roughly estimate the effectiveness of the new solution. First, contact problem of ice sheet and cone is simulated using simplified material model for ice. Then a numerical model of a wind turbine tower is constructed. Dynamic interaction between cone and tower is simulated and the new solution effectiveness is discussed in terms of tower and blades displacements. Finally a laboratory experiment is proposed to further elaborate this numerical feasibility study. 1