三体船波浪设计载荷的三维时域水弹性理论研究

Study of the design wave loads of a trimaran based on 3D time-domain hydroelastic theory

针对三体船波浪设计载荷问题,本文提出了三维时域非线性水弹性理论和非线性设计波法的计算三体船纵向波浪载荷方法,该法考虑了船体弹性效应和砰击载荷等非线性因素的影响。在巡航和极限工况下,将水弹性计算值与三维频域长期预报值、劳氏三体船规范计算结果进行了比较分析,发现在巡航工况下的水弹性计算值与规范值比较接近,可给出三体船的波浪载荷特征值,极限工况的计算值远大于规范值,本文建议在三体船结构强度校核时,应该增加极限工况。本文方法可为三体船相关规范修订和结构设计优化提供参考。

To solve the design wave loads on a trimaran, 3D time-domain nonlinear hydroelasticity theory and a nonlinear design wave method were used to calculate trimaran longitudinal wave loads. The method took an account of the influence of nonlinear factors in the elasticity of the ship hull, hull slamming loads, and other factors. Good matching was found between the calculated hydroelastic values with the three-dimensional frequency domain longterm prediction value and Lloyds Register （LR） Trimaran Rules when deriving the trimaran wave load characteristic values. The computed value under ultimate working conditions was shown to be significantly larger than the LR Trimaran Rule value. The authors suggest including ultimate working conditions when checking the trimaran structure strength. This method can provide a reference for a revision of the trimaran rules and for the optimization of the structural design of trimarans.