机构地区: 上海交通大学船舶海洋与建筑工程学院海洋工程国家重点实验室
出 处: 《实验室研究与探索》 2005年第12期14-17,共4页
摘 要: 研究一艘动力定位船舶从浅水40m到深水5000m的水动力学参数随水深变化的规律,数值试验结果表明,在浅水深时,一方面,3个垂向运动(垂荡、横摇和纵摇)附加质量有显著增加;另一方面,6自由度运动的阻尼系数均有明显增加,特别是横摇阻尼系数,随着水深吃水比的减小而成倍数增长。而当水深达到300m以后,随着水深的增加水动力学系数变化很小。 By using 3D linear potential theory, the hydrodynamic coefficients of a dynamic positioning ship in which water depth ranges from 40 ~5000m, were calculated numerically. It is shown that the added masses of heave , roll and pitch motions and the damping coefficients of all the motions increase remarkably in shallow water. In particular, the roll damping increases sensitively and rapidly with the decrease of the water depth ratio. When the water depth is larger than 300 meters, the hydrodynamic coefficients vary a little with the increase of water depth ratio.