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Model Updating of Soil-Structure Interface of Monopiled Offshore Wind Turbines


 As the vibration analysis of an offshore wind turbine (OWT) system should consider its soil-structure interaction, a recent article proposed a simple soil-structure interface model. It includes a horizontal spring, a rotational spring and a rotational dash-pot at the interface. Developing a finite element model updating method on correcting the soil-structure interface coefficients based on the true response measurements is highly desired. This paper develops an accurate and efficient model updating method for simultaneously updating the stiffness and damping parameters of the soil-structure interface of a monopiled offshore wind turbine, when only a few measured modal frequencies and damping ratios are available. The performance of the proposed method is numerically demonstrated through a simulated National Renewable Energy Laboratory 5-MW (NREL 5-MW) reference turbine.