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TY - JOUR TI - MONITORING OF OFFSHORE WIND TURBINES UNDER WAVE AND WIND LOADING DURING INSTALLATION AU - Sander, Aljoscha AU - Meinhardt, Christian AU - Thoben, Klaus-Dieter AB - During the single blade installation of offshore wind turbines, relative motion between the blade root and turbine hub can cause a delay in the progression of the installation. This contribution presents the results of a monitoring campaign conducted during the installation of an offshore wind park in the North Sea. The campaign covered different states of the turbines: without rotor blades, with rotor blades, without supplementary damping system and with an installed, tuned mass damper system. The objective of the campaign was to determine the dynamic behaviour of the turbines in correlation with wind and wave data and to determine modal parameters. Accordingly, the turbines have been instrumented with sensors to record accelerations at three different positions. The modal parameters were then obtained using SSI/FDD algorithms. Structural damping is additionally determined with an RDM algorithm, and the results are being compared. The analysis of the data will be presented, including the different stages of the structural damping and the corresponding changes in movement patterns. The results shall be used to verify the load models and the predicted response of the structure. DA - 2020/06/24/ PY - 2020 DP - Zotero SP - 18 LA - en ER -