Advancing the efficient computation of flexible interconnected multi-floater photovoltaic platforms by coupled hydrodynamic–structural model

The structural assessment of offshore floating photovoltaic platforms (OFPVPs) has long been a critical focus in engineering. Traditional structural assessment methods usually involve mapping loads from a hydrodynamic model to a structural finite element model (FEM) in a one-way process. However, hydrodynamic and structural analyses are typically treated as separate processes. In contrast, the present model integrates the FEM with the static condensation method to couple the hydrodynamic and structural models. This is accomplished by solving the frequency-domain multi-body equation of motion, which combines the condensed mass and stiffness of the platform's superstructure with the hydrodynamic coefficients of its floats in a high-dimensional matrix. The deformation of the superstructure is derived from the displacement of its center of gravity during the static condensation process, while its structural strength is assessed to evaluate the platform's integrity. To validate the present model, it is tested using the classical double-barge problem, demonstrating its reliability. The model is then applied to a four-column, 27.5 kW offshore floating photovoltaic platform to investigate its structural responses. These responses are compared to those obtained from the traditional approach, revealing that the present model outperforms the traditional approach in terms of computational accuracy and efficiency, making it more suitable for design and optimization purposes. Finally, additional analyses are performed with modified superstructures, providing insights into the structural responses of offshore floating photovoltaic platforms and demonstrating that safer structural configurations can be quickly identified through the application of the present model.