Speaker
Description
Offshore wind turbines radiate continuous underwater noise during operation, yet predictive tools for assessing this structure-borne component are scarce. This study presents a physics-based vibroacoustic framework for a 10 MW monopile-supported turbine. Time.domain aero-hydro-servo-elastic simulations (OpenFAST) provide nodal accelerations, which are converted into equivalent dipole sources using a frequency-dependent radiation correction. Acoustic propagation is computed via analytical Green's functions with free-surface and seabed image reflections. A synthetic drivetrain excitation model captures high frequency generator forces missing in standard aeroelastic simulations.Results show that low-frequency radiation exhibits a dipolar patern aligned with the fore-aft bending mode, while drivetrain excitations above ~10 Hz produce more axisymmetric directivity. In the shallow-water environment (30 m depth), propagation is partially confined, with distance decay rates intermediate between cylindrical and spherical spreading. The emitted spectrum overlaps with the hearing ranges of several marine species in the mid-to-high frequency bands, primarily in the near field.The framework enables early-design quantification of underwater acoustic footprint and can support environmental impact assessmentes and monitoring strategies for monopile offshore wind farms.