Motion response characteristics of a Kyushu-University semi-submersible floating wind turbine with trussed slender structures: experiment vs. numerical simulation

Understanding the dynamics of an FWT (Floating Wind Turbine) is essential for its design and operation. Since a truss structure can reduce wave load/resistance on floating foundation, it becomes more popular in industrial applications. In this regard, knowing effect slender members motion response characteristics such vital. The present work develops time-domain method modeling truss-structure wind turbine with multiple rotors deck platform. A hybrid panel-stick model built up incorporating potential flow theory to calculate inertia force Morison strip drag force. systematic methodology, corresponding efficient tool, have been developed deal trussed consisting set cylindrical arbitrary lengths, diameters, orientations, locations. dynamic solver incorporated into dynamics. proposed validated against experiment semi-submersible triangular-shaped truss-structured platform, which was carried out RIAM (Research Institute Applied Mechanics), Kyushu University. Good agreements between simulation results experimental data confirm validity method. Further numerical simulations are performed conditions investigate It found that without fluid viscosity, resonant responses excited platform motions at frequencies close natural system. Via comparison parked operating FWT, presence steady wind, translational surge or sway significantly resonance frequency. This may be attributed done by enhances remarkably total kinetic energy consequently increases velocity equilibrium position. Applying will effective reducing all these non-realistic large responses.