1 Department of Civil Engineering, The Faculty of Engineering and Science, Aalborg University, VBN2 Division of Water and Soil, The Faculty of Engineering and Science, Aalborg University, VBN3 Wave Energy Research Group, The Faculty of Engineering and Science, Aalborg University, VBN4 Marine Structures, The Faculty of Engineering and Science, Aalborg University, VBN5 The Faculty of Engineering and Science (ENG), Aalborg University, VBN6 Rambøll Offshore Wind - Esbjerg
The rising demand for renewable energy solutions is forcing the established industries to expand and continue evolving. For the wind energy sector, the vast resources in deep sea locations have encouraged research towards the installation of turbines in deeper waters. One of the most promising technologies able to solve this challenge is the floating wind turbine foundation. For the ultimate limit state, where higher order wave loads have a significant influence, a design tool that couples non-linear excitations with structural dynamics is required. To properly describe the behavior of such a structure, a numerical model is proposed and validated by physical test results. The model is applied to a case study of a tension leg platform with a flexible topside mimicking the tower and a lumped mass mimicking the rotor-nacelle assembly. The model is additionally compared to current commercial software, where the need for the coupled higher order dynamics proposed in this paper becomes evident.
Energies, 2014, Vol 7, Issue 8, p. 5047-5064
Floating wind turbine; TLP; Non-linear waves; Physical model tests; Ultimate limit state wave load