海上风电新型柔性海缆保护装置疲劳性能研究OA

Offshore wind power is a rapidly developing new energy source globally.The reliability of submarine cable systems,serving as the"lifeline"for offshore energy transmission,is emerging as a critical bottleneck hindering the large-scale development of the industry.Common issues affecting submarine cables include abrasion,corrosion,and fatigue damage caused by alternating loads.Among these,the suspended section of submarine cables,subjected to long-term wave-current coupling effects and dynamic bending loads,exhibits fatigue damage rates 3～5 orders of magnitude higher than those of the flat-laid sections,making it a high-incidence area for fatigue failure.To address this problem,a novel flexible submarine cable protection device is proposed featuring a streamlined integrated tubular structure with built-in reinforcement layers to enhance mechanical properties.By combining ABAQUS and Fe-safe software to simulate vortex-induced vibration and wave-current coupled loads,a fatigue life analysis of the submarine cable is conducted to verify the protective effect of the new device on the suspended section.Research results demonstrate that under 50-year return period conditions,the flexible protection device reduces the peak displacement in the U1 direction by 82％and increases fatigue life by 133 times.Under annual return period conditions,it reduces the peak displacement in the U1 direction by 79％and increases fatigue life by 1 000 times,significantly decreasing the amplitude of fatigue cycles and extending the submarine cable's fatigue life.