扰动波浪下考虑浮体变形的大型船型网箱响应分析  

Analysis on response of a large vessel-shaped fish cage considering the deformation of floating body in waves

作　　者：王益厚 付世晓[1] 许玉旺[1] 程天琥 傅强 WANG Yi−hou;FU Shi−xiao;XU Yu−wang;CHENG Tian−hu;FU Qiang(State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;China Ocean Engineering Equipment Technology Development Co.,Ltd.,Shanghai 200011,China;Yantai CIMC Raffles Offshore Limited,Yantai 264035,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]中国海洋工程装备技术发展有限公司,上海200011 [3]烟台中集来福士海洋工程有限公司,山东烟台264035

出　　处：《船舶力学》2025年第4期560-570,共11页Journal of Ship Mechanics

基　　金：国家杰出青年科学基金项目(51825903);国家自然科学基金基础科学中心项目(52088102);山东省重点研发计划项目(2021SFGC0701)。

摘　　要：近年出现的大型船型网箱的长度接近四百米,在波浪中会出现明显的弹性变形,而作用在网衣和钢架上的水动力也会增加结构分析的复杂性。本文提出一种时域分析方法,用于计算大型船型网箱的运动和结构响应。首先将网箱的大型浮体离散为多模块刚体,模块间利用等效弹性梁连接,并考虑网衣和钢架等非线性因素的影响,在时域内建立考虑浮体变形的浮式网箱动力分析模型,其中浮体的辐射载荷通过直接施加附加质量和势流阻尼计算或者采用状态空间法求解,网衣和钢架载荷则考虑了大型浮体扰动产生的绕射波和辐射波影响,采用莫里森方程计算。结果发现:网衣和钢架水动力对网箱的截面动力响应有明显的影响,而网箱的截面弹性对网衣张力也有一定的影响,这可为大型船型网箱的结构分析和截面设计提供借鉴。Large vessel-shaped fish cages are promising large aquaculture structures developed in recent years,with maximum structure length of nearly 400 meters.The effects of the hydrodynamics on the nets and the frames will be significant for the cage deformation response in waves,which will increase the complexity of the cage design.In this paper,a coupled dynamic model of a large vessel-shaped fish cage is used to calculate the motion and structural response in the time domain.Firstly,the floating body of the cage is discretized into multi-module units,connected by equivalent elastic beams.The nonlinear effects of the net and steel frames are considered.A floating cage model considering the deformation of the floating body is then established in time domain for dynamic analysis.The radiation force of the floating body is solved by applying the added mass and damping directly or the state space method,and the hydrodynamic loads on the net and steel frames considering the disturbing effect of floating body are calculated by Morison formula. Theresults show that the hydrodynamics of the net and frames have an obvious influence on the response of thefish cage and the cross-sectional elasticity produces a certain degree influence on the net twine tension, whichprovides reference for structural analysis and cross-sectional design of the large vessel-shaped fish cages.

关 键 词：大型船型网箱 弹性变形 运动响应 截面载荷 网衣张力 

分 类 号：S955.9[农业科学—水产养殖] U661[农业科学—水产科学]