Spar平台垂荡板水动力特性强迫振动试验研究

采用强迫振动试验的方法,对Spar平台不同振幅和不同振动频率下的附加质量系数和粘性阻尼系数进行了系统研究。分析研究了实心垂荡板和开孔垂荡板对Spar平台水动力特性的影响,并将Spar平台整体模型的试验结果与圆柱体和单独考虑垂荡板时的试验结果比较,结果表明垂荡板结构能有效提高Spar平台的附加质量系数和粘性阻尼系数,在KC=0.2～1.3时,开孔率为5%的开孔垂荡板Spar平台和实心垂荡板Spar平台相比,粘性阻尼有所提高但是附加质量减小。试验进一步研究了垂荡板间距对Spar平台水动力性能的影响,得到了水动力系数随垂荡板间距的变化情况,研究成果对实际工程中Spar平台的优化设计具有一定的指导意义。

Experimental investigations of hydrodynamic characteristics of the heave plates of Spar platforms

The hydrodynamic coefficients of the Spar platform,including added mass coefficients and drag coefficients,were experimentally studied using forced oscillation method.The effects of solid heave plates and perforated plates on hydrodynamic characteristics of the Spar platform were studied and discussed.Experiments for solitary cylinder and heave plates were also carried out separately and the experimental results were compared with that for the Spar platform models.It was found that the heave plates could increase the added mass and drag force of the Spar platform effectively.The heave plates with perforation ratio of 5% could increase the drag force and decrease the added mass for the Spar platform compared with the solid heave plates in the range of KC=0.2~1.3.In addition,the relationship between the heave plate spacing and hydrodynamic coefficients of the Spar platform was analyzed.The presented results can be referred to in practical engineering design.