Aeroelastic investigations of composite blade on floating offshore wind turbine : insights into stress responses on multi-hierarchy blade structures

To improve the blades aeroelastic performance on floating offshore wind turbines, it is essential to analyse the stress conditions and distributions on composite blades. This paper serves as a continuation of the previous work, we examined the impacts of FOWT platform surge periods and amplitudes to the composite blade aeroelastics, with considerations of turbulent effects when solving for the aerodynamic loads. The result shows that a shorter surge period and larger surge amplitude can lead to significant stress increases. The stress concentrations are predominantly observed on the blade substructural shear webs, underscoring the need for local stress inspections. A linear relationship between surge amplitude and local max. stress magnitude is identified, which is helpful for a quick preliminary blade design. The findings contribute to the development of more robust and efficient offshore wind energy systems, providing detailed aeroelastic insights for the blade optimizations in the future works.