深海采矿船旁靠窄缝对双船水动力特性的影响

Influence of Side-by-Side Gap on Hydrodynamic Characteristics of Two Ships for Deep Sea Mining Ship

基于三维势流理论及阻尼盖方法,研究深海采矿船旁靠窄缝流体对于波面升高、波浪力及幅值响应算子的影响。建立深海采矿船旁靠外输水动力模型,在两船之间窄缝设置阻尼盖,针对随浪及选取不同阻尼盖阻尼因子值,计算窄缝内的波面升高,研究窄缝内波面升高特性;针对迎浪和改变阻尼因子取值,计算1阶波浪力和平均波浪漂移力,分析阻尼因子对于1阶波浪力和平均波浪漂移力的影响;考虑不同浪向和有无阻尼盖,计算幅值响应算子,分析窄缝流体振荡对于幅值响应算子的影响。研究表明:纵浪中窄缝流体振荡对于船中部分波面升高影响最大,设置阻尼盖可有效抑制不符合实际的波面升高;纵浪中窄缝水动力对于纵荡、纵摇和垂荡波浪力影响较小,对于横荡、横摇及艏摇波浪力影响较大;纵浪中设置阻尼盖对于横荡和横摇影响较大,而对于对称运动影响较小。

Based on the three dimensional potential theory and damping lid algorithm,the influence of the side-by-side gap of the deep-mining vessel on the wave elevation,the wave load and the Response Amplitude Operator(RAOs)are investigated.The hydrodynamic model of the side-by-side offloading deep-mining vessel is established,the damping lid is set in the gap between both vessels.By changing different damping coefficients of the damping lid,the wave elevation in the gap is calculated in the following wave and wave elevation characteristics in the gap is studied.With considering heading wave and changing damping factor to calculate first order wave forces,the first-order wave load and mean drift wave loads are analyzed.Considering different incident wave directions and the existing cases of the damping lid,the RAOs are calculated and the fluid in the gap effect on the RAOs is studied.The research shows that,the gap in the following wave has the greatest impact on the wave elevation in the ship middle,while slightly affect the elevation at the bow or stern.The damping could effectively erase the impractical wave elevation.In longitudinal waves,the hydrodynamic force of narrow slit has little effect on the wave force of surge,pitch and heave,but has great effects on the wave force of sway,roll and yaw.The gap has significant effects on the sway and roll motions,but has little influence on the symmetric motions in the longitudinal wave.