ScholarWorks@경상국립대학교

초록

In the present study, a numerical investigation was carried out to evaluate the effect of clamp spacing on the VIV behavior of submarine cables subjected to steady current conditions. A submarine cable supported by clamps on a structure was modeled, and current velocities corresponding to the 50-year extreme condition in the southwestern sea of Korea were applied in the range of 0.9–1.1 m/s. Clamp spacing was varied from 2 m to 4 m to assess its influence on vibration characteristics. Numerical analysis was performed, and vibration frequency responses were evaluated through fast Fourier transform (FFT) analysis of the cable motion. The numerical results demonstrate that increasing clamp spacing results in a decrease in vibration frequency and a corresponding increase in vibration amplitude, which can be attributed to the reduction in effective structural stiffness associated with longer free-span lengths. For a clamp spacing of 2 m, the vibration frequencies remained within the VIV-dominant range under all current velocities considered. In contrast, for clamp spacings of 3 m and 4 m, the vibration frequencies shifted outside the VIV-dominant range at higher current velocities, indicating reduced susceptibility to VIV. The results further indicate that a clamp spacing of 3 m is relatively safe against VIV under a current velocity of 0.9 m/s, while a clamp spacing of 4 m is preferable under a current velocity of 1.0 m/s.

키워드