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。
The result showed that the fluid fluctuated under rolling motion, and the frequency of the fluctuation was the same as the rolling frequency.
实验结果表明，流体在摇摆作用下产生波动；波动频率与摇摆频率一致。
The results show that heat transfer of natural circulation under rolling is enhanced. Heat transfer coefficient increases with rolling amplitude and rolling frequency increasing.
试验结果表明，摇摆运动下，自然循环的换热能力得到了加强，摇摆的频率和振幅增加，换热系数也相应增加。
The results show that heat transfer of natural circulation under rolling is enhanced. Heat transfer coefficient increases with rolling amplitude and rolling frequency increasing.
试验结果表明，摇摆运动下，自然循环的换热能力得到了加强，摇摆的频率和振幅增加，换热系数也相应增加。
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