弹性浮体的二阶平均漂移力研究  

Numerical study of mean drift force on a flexible floating body

作　　者：李帅[1,2] 付世晓 张仕元[1,2] LI Shuai;FU Shi-xiao;ZHANG Shi-yuan(State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Collaborative Innovation Centre for Advanced Ship and Deep-Sea Exploration,Shanghai 200240,China)

机构地区：[1]上海交通大学海洋工程国家重点实验室,上海200240 [2]高新船舶与深海开发装备协同创新中心,上海200240

出　　处：《船舶力学》2024年第5期651-662,共12页Journal of Ship Mechanics

基　　金：国家自然科学基金基础科学中心项目(52088102)。

摘　　要：本文基于离散模块思想,提出一种求解弹性浮体二阶平均漂移力的数值方法。首先将连续弹性浮体离散为弹性梁连接的刚性模块系统,实现弹性梁刚度和各模块水动力信息的耦合,在频域内求解浮体一阶水弹性响应。然后利用二阶多体水动力理论,并考虑计及结构弹性变形影响后的各模块一阶运动信息,获得各刚性模块上的二阶平均漂移力。最后,利用该方法求解自由柔性驳船的平均漂移力,并与基于模态叠加思想的三维水弹性理论的计算结果进行对比验证。此外,由于本文方法在水动力求解方面的离散特性,该方法可直接拓展到非均匀波浪场下浮体的水弹性响应分析。Based on the discrete module methodology,this paper proposes a numerical method to estimate the mean drift forces on flexible floating bodies.The continuous structure was first discretized into rigid mod⁃ules connected by elastic beams.The first-order hydroelastic responses were solved by coupling the hydrody⁃namics on modules and the structural stiffness of elastic beams in the frequency domain.Based on the firstorder motions of the modules,the second-order mean drift forces on each rigid module were calculated by second-order multi-body hydrodynamic theory.The motions and mean drift forces of a freely floating flexible barge using the proposed method were verified against the results obtained by the 3D hydroelastic theory based on modal superposition.Moreover,due to the discrete property of the present method for hydrodynam⁃ics,the method can be directly extended to inhomogeneous wave conditions.

关 键 词：水弹性 离散模块 平均漂移力 频域 

分 类 号：U441[建筑科学—桥梁与隧道工程]