Akademik Veri Yönetim Sistemi
Ocean Engineering, cilt.340, 2025 (SCI-Expanded)
This study investigates the stochastic frequency behavior of hybrid offshore energy systems composed of a 5 MW wind turbine and a 2 MW hydrokinetic turbine. A Monte Carlo Simulation (MCS) framework with 10,000 iterations was developed to account for uncertainties in soil, material, and environmental parameters. Unlike conventional methods that assume fixed effective mass coefficients, this study models them as random variables to reflect the variability induced by operational loads. A two-degree-of-freedom (2DOF) formulation was proposed and validated against results from an ANSYS-based finite element model, with deviations remaining below 2.5 % across varying monopile thicknesses. Sensitivity analysis identified the force ratio (impact score: 0.9731) and the second effective mass coefficient (0.4261) as key contributors to frequency variation. Notably, only 19.91 % of simulations yielded frequencies within the safe operational range, indicating frequent operation outside resonance-safe zones. These findings underscore the necessity of including full-range operational loads in dynamic assessments—particularly for hybrid systems where turbine thrust asymmetry can cause dynamic imbalance. The proposed approach offers a reliable framework for frequency-based design under uncertainty and contributes to safer and more efficient offshore energy infrastructure.