基于模型试验与三维水弹性理论的船舶波激振动响应研究

Springing investigation of a ship based on model tests and 3D hydroelastic theory

船体波激振动使得船体结构中产生高频、持续和具有一定幅值的振动应力,可能引起结构发生严重的疲劳损伤,因而对船舶结构的安全性带来严峻的挑战。文章以一艘大型LNG船为研究对象,采用三维线性水弹性理论与水池模型试验方法对船舶波激振动响应进行了比较分析,研究了规则波与不规则波中的波激振动特性。改变该LNG船的刚度,并保持船型、重量分布等其它主船体特征不变,在模型试验和理论计算中探讨了刚度对波激振动的影响。通过两种刚度船体梁的模型试验与理论计算结果的比较分析,给出了波浪周期和船体刚度的变化对波激振动影响的几点结论。

Springing responses will induce continuous amplitudes, in ship structures. Thus serious fatigue vibrating stresses, with high frequencies and certain damage might appear in ship structures and the safety of ship structures might be severely threatened. The comparison of springing responses, based on 3D hy- droelasticity theory and model tests, of a large LNG carrier both in regular and irregular waves was present- ed in this paper. In order to study the influence of hull girder stiffness on springing, the original stiffness of the LNG carrier was reduced, but other main particulars such as bodyline and weight distribution were not changed. Several conclusions are made about the effects of wave periods and hull girder stiffness on springing responses according to the comparison of experimental and theoretical results of the LNG carriers with different stiffness.