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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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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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