Dynamic Analysis and Extreme Response Evaluation of Lifting Operation of the Offshore Wind Turbine Jacket Foundation Using a Floating Crane Vessel

The jacket is the most widely-used fixed foundation for offshore wind turbines due to its superior strength and low installation cost in relatively deep waters. Floating crane vessels are commonly used install foundations. However, dynamic coupling between floating vessel might generate complex responses under wave action. complexity of multi-body system requires comprehensive time-domain simulations statistical analysis obtain reliable results, especially evaluation operational safety lift installations a foundation. In this context, study performs numerical analyses predict extreme preliminary allowable sea states guiding lowering operation using vessel. First, ANSYS-AQWA hydrodynamic coefficients frequency domain. A nonstationary simulation with winches performed identify several critical vertical positions from time series an irregular wave. target probability evaluated by distribution model after large number steady-state waves. position determined three comparing responses. Eigenvalue spectrum carried out find natural periods characteristics different components. influence direction, significant height, peak period on also analyzed position. Furthermore, optimal direction as head sea. Preliminary derived calculated amplification coefficient defined criteria.