The roll is increased and severer than shipping state when the frequency of wave is similar as the natural rolling frequency of ships.
船舶在系泊或低航速状态下，当涌浪周期接近船舶自然横摇周期时，船舶摇摆比航行时更为剧烈。
There is no peaking in the response but simply a smooth roll-off above the natural frequency.
响应期间无高峰期，只是简单的，在固有频率上平滑的跌落。
A nonlinear parametric excitation equation is obtained for ships in longitudinal waves, and the dynamic stability is analyzed when the natural frequency of heave and roll are approximately equal.
本文建立了在纵浪上航行船舶的非线性参数激励横摇运动方程，研究了当升沉固有频率接近横摇固有频率时船舶的稳定性。
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