It is shown that phase space flux is growing continually along with significantwave height and the safe basin of ships is decreasing rapidly.
研究表明：随有义波高增大，相空间转移率不断增大，船舶航行的安全域迅速减小。
2
As the significantwave height rises, the area of the safe basin reduces and is no longer continuous, and the safe area and the capsizing area are interlaced.
随着有义波高增大，安全域面积减小并且不再连续，倾覆域和安全域相互包围。
3
To examine the effects of significantwave height and incident wave direction on platform motion, a series of experiment tests are carried out with different sea states.