基于离散模块梁单元理论的超大型浮体在非稳态载荷下的水弹性响应  

Hydroelastic Response of VLFS Under Unsteady External Loads Based on Discrete Module Beam Method

作　　者：陈永强 宋炜[2] 张显涛[1,3] CHEN Yongqiang;SONG Wei;ZHANG Xiantao(State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;East China Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Shanghai 200090,China;Sanya Yazhou Bay Institute of Deepsea Technology,Shanghai Jiao Tong University,Sanya 572024,Hainan,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]中国水产科学研究院东海水产研究所,上海200090 [3]上海交通大学三亚崖州湾深海科技研究院,海南三亚572024

出　　处：《中国海洋平台》2024年第1期17-25,共9页China offshore Platform

基　　金：科技部国家重点研发计划:蓝色粮仓科技创新专项(编号:2019YFD0900904);国家自然科学基金青年基金(编号:42206227);海南省三亚崖州湾科技城重点项目(编号:SKJC-2020-01-006);海南省科技计划三亚崖州湾科技城自然科学基金联合项目(编号:2021JJLH0062)。

摘　　要：使用离散模块梁单元(Discrete-Module-Beam,DMB)理论计算超大型浮体在非稳态载荷下的水弹性,包括位移响应和结构力响应。使用三维势流理论进行水动力分析,并基于Cummins方程将DMB方法扩展至时域;使用子梁法进行位移响应还原。在求解结构力响应时,结构被视作无支持、两端自由的无质量梁,将其所受外载荷按沿结构纵向分布是否已知划分为2类。对于已知分布的外载荷,直接对其进行积分即可获得结构力分布;对于未知分布的外载荷,使用改进后的三次曲线插值法求解结构力分布。计算定点货物移动和飞机降落工况下的水弹性响应。采用DMB方法可准确计算结构位移响应,也可给出非稳态加载过程中初始阶段的弯矩分布,并体现由集中力作用引起的弯矩突变。The Discrete-Module-Beam(DMB)method is applied on a Very Large Floating Structure(VLFS)to perform a hydroelastic analysis under unsteady external loads,including displacement response and structural force response.The hydrodynamic analysis is performed by three-dimensional potential flow theory,and the DMB method is extended to the time domain based on the Cummins equation;the displacement response is restored by the sub beam method.The structure is viewed as a massless free-floating beam,whose external loads are divided into 2 groups according to whether the distribution is known or not.The structural force distribution induced by loads whose distributions are known is obtained directly with an integration of these external loads.For the loads with unknown distribution,a third-order interpolation scheme is implemented after some processing on the original hydroelastic equation.A cargo dispatch case and a plane landing case are calculated.The DMB method is able to give the accurate structural displacement response and bending moment distribution in the initial stage of the loading process and shows an abrupt change on the location where a concentrated force is exerted.

关 键 词：超大型浮体 离散模块梁单元 非稳态载荷 位移响应 结构力响应 

分 类 号：TV131.2[水利工程—水力学及河流动力学]