超大浮体的多段梁模型特性分析

Characteristics of multi-segment beam model of very large floating structure

为分析超大型浮体的水弹性响应特性,以某超大型浮体为研究对象,通过建立多段梁模型,并利用ANYSY软件进行结构干模态分析,利用流体分析软件求解得到结构的水动力系数,最后通过水弹性计算程序对超大型浮体在不同浪向、不同波长波浪作用下的水弹性响应进行了研究。同时,为分析超大型浮体连接件刚度的影响,对不同连接件刚度下的水弹性响应进行了对比分析。计算结果表明,长波作用下浮体的刚体作用占主导,而在短波作用下弹性变形占主导;浮体对波浪的浪向较为敏感,但弹性变形的最大值一般出现在波长接近于浮体在波浪入射角方向上投影的长度时,浮体的水弹性响应对连接件的刚度较为敏感。

To study the hydroelastic response of very large floating structures,multi-segment beam model of a very large floating structure was proposed here.With the help of ANSYS and hydrodynamic analysis tool,dry modal and hydrodynamic coefficients were obtained.Then hydroelastic analysis of the beam model was conducted and the hydroelastic response under waves of different incident direction and different wave length were studied.The stiffness of the connectors were under study at the same time.It can be concluded from the results that,under long waves,rigid body motion is dominant,while elastic deformation dominates under short waves.The hydroelastic response is sensitive to the wave heading and the biggest elastic deformation always happened when the projection of the length of the VLFS on wave heading direction is close to the wave length.Elastic deformation is sensitive to the stiffness of the connectors.