船型网箱运动-波浪场扰动-网衣受力耦合动力响应特性
收稿日期: 2022-10-17
修回日期: 2022-11-28
录用日期: 2022-12-05
网络出版日期: 2024-03-04
基金资助
国家杰出青年科学基金(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)
Dynamic Response of a Vessel-Shaped Fish Cage Considering Coupling Effect Among Body Motion, Disturbed Velocity Field, and Net Loads
Received date: 2022-10-17
Revised date: 2022-11-28
Accepted date: 2022-12-05
Online published: 2024-03-04
船型网箱是一种由大型浮体、钢架、网衣系统及系泊系统构成的新型海洋养殖结构.大型浮体在波浪中产生的绕射和辐射作用会对波浪场产生扰动,进而改变网衣受力,这种相互作用此前还未被研究过.本文基于势流理论求得绕射波和辐射波在网衣周围波浪场的速度传递函数,同时采用莫里森方程求解计及波浪场扰动的网衣水动力载荷;对网衣水动力载荷与浮体运动不断迭代计算,实现计及网箱运动-波浪场扰动-网衣受力耦合效应的船型网箱动力响应分析;最后,研究了不同幅值的规则波下这种耦合效应对网箱运动、网衣张力、容积损失和连接器载荷的影响规律.结果发现: 波浪场扰动对网箱运动和容积损失的影响不明显,但是会导致网衣张力和连接器载荷明显增大,这能够为船型网箱的结构强度校核及安全设计提供指导.
王益厚, 付世晓, 许玉旺, 李帅, 傅强, 刘富祥 . 船型网箱运动-波浪场扰动-网衣受力耦合动力响应特性[J]. 上海交通大学学报, 2024 , 58(2) : 147 -155 . DOI: 10.16183/j.cnki.jsjtu.2022.404
Vessel-shaped fish cages are a new type of large aquaculture structure consisting of a floating body, steel frames, net system, and mooring system. The diffraction and radiation waves induced by the floating body can disturb the velocity field and induce additional changes to the hydrodynamic loads on the nets. In this paper, the velocity transfer functions around the nets induced by the diffraction and radiation waves are obtained and the effects of floating body on the forces of the nets are calculated by the Morison equation. By performing the iterations between the motion of floating body and loads on the nets, the fully coupled dynamic response of motion-disturbing velocity field-net loads is realized. Finally, the effects of diffraction and radiation waves on motion response, tension in the net twine, volume reduction, and connector loads are investigated. The results show that the influences of disturbing velocity field on cage motion response and volume reduction are not obvious, but they can lead to a significant increase in the tension in net twine and connector loads, which can provide helpful reference for the structural strength analysis and safety design of vessel-shaped fish cages.
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