《Table 4Main particulars of tanks in LNG-FPSO, m》

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《考虑晃荡耦合船舶运动的晃荡压力算法（英文）》

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Considering ship motions without coupling with sloshing，the peak in roll is observed near the roll natural frequencyωo=0.483 rad/s，i.e.at a period 13.03 s（Fig.9b）.Hence，an extreme sea state characterised with a peak period Tp=13.03 s（or mean zero crossing period Tz=9.26 s）will represent rollresonant condition with the vessel experiencing large roll.From the 1-year return envelope curve for this peak period，the significant wave height is obtained as Hs=10.79 m.Thus，for this uncoupled case with 30%–30%filling，the combination of Tp，Hsof（13.03 s，10.79 m）is chosen for the analysis.Consider now the coupled case，for which the roll RAO peaks atωo=0.445 rad/s corresponding to a period of 14.11 s（Fig.9b）.From the 1-year return envelope curve for Hs，we find that for Tp=14.11 s，the corresponding significant height is11.47 m.Thus，for the coupled case with 30%–30%filling，the selected extreme wave condition is the combination（Tp，Hs）=（14.11 s，11.47 m）for which the analysis is performed.Using the same reasoning，for the 20%–20%filling case，analysis for the coupled case is performed for the combinations（Tp，Hs）=（16.93 s，12.05 m）.Note that the uncoupled case remains same as in the 30%–30%filling case.In brief，the selection of the extreme wave conditions at which pressures are assumed to represent the worst case are estimated by choosing a wave spectrum with the peak period matching the corresponding peak of the roll RAO，and then choosing the significant wave height for that peak period from the envelope curve with 1-year return period.For ease of reference，the selected sea state parameters for the three cases are summarised in Table 5.