A Comparative Study on the Motions of a Mooring LNG Ship in Bimodal Spectral Waves and Wind Waves

2018 International Conference on Civil and Hydraulic Engineering

土木建筑工程;水利工程

Shi, Xianying^1

College of Marine and Civil Engineering, Dalian Ocean University, China^1

关键词: Comparative studies;    Low-frequency;    Low-frequency waves;    Motion response;    Physical model test;    Spectral peak;    Total energy;    Transverse waves;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/189/5/052047/pdf
DOI  :  10.1088/1755-1315/189/5/052047

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

By adopting the method of a series of physical model tests, a study has been conducted to compare the motion responses of a mooring ship under the action of bimodal spectral waves and pure wind waves. The results show that the low-frequency waves in the bimodal spectrum waves control the motion responses of the mooring ship. When the energy of bimodal spectral waves equals the one of pure wind waves, the amount of mooring ship motions under the action of bimodal spectral waves is significantly larger than that of pure wind waves. Under such circumstances, even when the energy of the low-frequency waves accounts for only 20% of the total energy of the bimodal spectral waves and the low spectral peak period is 12s, the movement quantity of sway can reach 1.5 times in bimodal spectral waves than in pure wind waves. The movement quantities of surge, heave, and roll in bimodal can reach more than 2 times of those in pure wind waves. Under the action of transverse waves, the mooring ship's movement of pitch is not affected by the wave height of bimodal spectral waves and the period of low-frequency bimodal spectral waves.