深水作业船锚索锚泊性能研究

为了探索深水作业船的锚索锚泊性能,运用悬乖线理论分析了钢索和复合锚索的无因次长度、重量与位能,推导出了钢索和复合锚索位能对外力导数的公式,从锚索静载荷角度研究了钢索和复合锚索吸收动载荷的能力.模拟计算结果表明,与钢索相比,复合锚索对增加卧底锚索重量、保持锚的稳定性和抓力是有利的,对减小锚泊船漂移范围也有益处,但吸收动载荷能力下降.复合锚索中设置的锚链的长度取1节(27.5 m)为宜,锚泊时甲板以下锚索长度以2.5～3.0倍水深较为合适.此结论对深水作业船的锚泊操纵有一定的参考意义.

Performance of Mooring Cable on Deepwater Work Boats

In order to explore the anchoring performance of mooring cable on deepwater work boats, dimensionless lengths, weights and potential energies of steel cables and compound mooring lines are analyzed with catenary theory. Formulas about potential energy derivatives of steel cables and compound mooring lines are derived, and their abilities of absorbing dynamic loads are studied form the viewpoint of static loadings of mooring cables. Numerical results show that comparing to steel cables the chains set between anchor and wire cable are good for increasing the weight of mooring cable laying on seabed and keeping stability and holding power of the anchor. The chains are also helpful to lessen scope of vessel swing, but its ability of absorbing dynamic load of mooring line is decreased. The chains of compound cables are recommended as 1 'shackle' in length and the suitable length of mooring cable below deck may be 2. 5-3. 0 times of water depth. These conclusions can be a reference for anchoring of deepwater work boats.