Investigation on Stress Response Characteristics of Wind Turbine Jackets During Towing Under Different Transportation Modes

Addressing the engineering needs of long-distance towing transportation for offshore wind turbine jackets in deep seas, as well as addressing the deficiencies in existing research regarding the quantitative comparison of stress response systems under different transportation modes and the insufficient understanding of the coupling mechanism between wave direction angle and wave frequency, this paper establishes a finite element model of the jacket-transport vessel coupling based on SESAM software. It conducts frequency-domain stress response analysis across the full parameter range under both horizontal and vertical transportation modes, quantitatively studying the variation patterns and impact mechanisms of six key stress parameters within the range of 0~180° wave direction angle and 0.6~2.0 rad/s wave frequency. The research results indicate that the stress in the jacket exhibits a significant low-frequency dominance under both transportation modes. The stress amplitude is large and fluctuates violently within the low-frequency range of 0.6~1.2 rad/s, reaching peak values under all conditions in the 90° beam sea condition. Compared to horizontal transportation, the stress response amplitude under vertical transportation is significantly lower under all conditions, demonstrating superior structural stability and transportation safety. The research findings reveal the stress response mechanisms of the two transportation modes under the dual-parameter effect.