Finite-element model for geometric nonlinearity and dynamic stiffness of synthetic mooring lines
Shagun Agarwal (TU Delft - Offshore Engineering)
Oriol Colomés (TU Delft - Offshore Engineering)
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Abstract
Synthetic mooring lines are increasingly considered for lightweight offshore renewables, but their elasticity poses modelling challenges due to large deformations and frequency-dependent dynamic and non-linear stiffness. To address this, we developed a finite element model based on finite-strain theory and dynamic stiffness. We utilise Tangential Differential Calculus for large deformation analysis and Schapery viscoelastic model for the non-linear constitutive relationship. Our results show that in taut systems, viscoelastic effects dominate at higher frequencies, leading to creep and relaxation under cyclic loads. In catenary systems without a chain segment, viscoelastic impacts are minimal due to low tension in the synthetic line.