Author(s): Yu Tan; Yang Dai; Jiesheng Min
Linked Author(s):
Keywords: Offshore wind power Dynamic wave response Fatigue analysis Finite element analysis
Abstract: Towards a more efficient wave spectral fatigue workflow based on the finite element method (FEM), in this paper, a frequency-domain and mesh-independent dynamic response analysis method was proposed considering the non-linear pile-soil interaction effect. For the superstructure, frequency-domain harmonic analysis was adopted with the foundation condensed into macro-element. The non-linear wave load was precisely integrated on fictive integration points and converted to nodal loads to decorrelate the stress response with the mesh density, then projected to frequency-domain via fast Fourier transformation. The pile stress response was obtained by one-way coupled quasi-static analysis using the reduced pile model. The method was applied to industrial cases aiming at assessing the fatigue damage of monopile and jacket wind turbine foundations constructed in the offshore wind farm of south China. The results showed that the proposed method outperforms the traditional approaches in terms of time-efficiency while maintaining the equivalent accuracy compared to the commercial software. A cloud-based simulation software was finally developed to provide a convenient, interactive and shared numerical tool for offshore structure design.
Year: 2025