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开敞水域半潜船初稳性高度限值的确定

Keywords: 国家自然科学基金资助项目(71570125),中央高校基本科研业务费专项基金资助项目(3132016358).

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Abstract:

利用横摇与垂荡两个自由度的船舶运动方程模拟半潜船在船长等于波长、遭遇频率为2倍横摇频率情形下的非线性横摇情况.研究发现,零航速的半潜船在理论上也能发生参数横摇.针对这一发现,基于参数横摇第一层薄弱衡准要求,提出开敞水域半潜船初稳性高度限值的判别式,并进行案例计算.结果表明,该判别式简便合理.
Ship motion equations with two freedom degrees of rolling and heaving were used to simulate the nonlinear rolling of semi-submersible vessel under the condition of ship length being the wave length and the encounter frequency being twice natural frequency of rolling. It was found that theoretically the parametric rolling can happen for the semi-submersible vessel at zero speed. Based on the Level 1 vulnerable criteria of parametric rolling, the metacentric height limits formula in open sea was proposed, and a calculation case was carried out. Results indicate that this formula is simple and reasonable.

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