Computationally efficient modelling of dynamic soil-structure interaction of offshore wind turbines on gravity footings

摘要: Abstract The formulation and quality of a computationally efficient model offshore wind turbine surface foundations are examined. aim is to establish model, workable in the frequency time domain, that can be applied aeroelastic codes for fast reliable evaluation dynamic structural response turbines, which geometrical dissipation related wave propagation into subsoil included. Based on optimal order consistent lumped-parameter obtained by domain-transformation method weighted least-squares technique, vibration 5.0 MW evaluated different stratifications, environmental conditions foundation geometries nonlinear multi-body code HAWC2. Analyses show with three five internal degrees freedom per displacement or rotation necessary obtain an accurate prediction domain. In addition, required static bearing capacity leads fore–aft vibrations during normal operation insensitive propagating subsoil—even soil stratifications low cut-in frequencies. this regard, utilising discrete second-order models physical interpretation rational filter puts special demands Newmark β-scheme, where integration most cases only provides causal constant acceleration within each step.