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 amplifications. The stress concentrations are predominantly observed on the blade substructure 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. • Investigated platform surge motion impacts on the composite blades aeroelastics. • Identified the NREL 5 MW FOWT blade stress responses on multi-hierarchy composite structures. • Considered turbulent aerodynamic loads for resolving the stress distributions on composite structures. • Adopted an effective two-way FSI analysis framework to address blade aeroelastics with large deformations.