Dynamic Response of a Vessel-Shaped Fish Cage Considering Coupling Effect Among Body Motion, Disturbed Velocity Field, and Net Loads

doi:10.16183/j.cnki.jsjtu.2022.404

Abstract

Abstract:

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.

Key words: vessel-shaped fish cage, diffraction and radiation waves, cage motion, tension in net twine, volume reduction, connector load

CLC Number:

U661
S955.9

WANG Yihou, FU Shixiao, XU Yuwang, LI Shuai, FU Qiang, LIU Fuxiang. Dynamic Response of a Vessel-Shaped Fish Cage Considering Coupling Effect Among Body Motion, Disturbed Velocity Field, and Net Loads[J]. Journal of Shanghai Jiao Tong University, 2024, 58(2): 147-155.

Figures/Tables 12

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参数	取值
浮体长度,L_F/m	385
浮体型宽,B_F/m	60
浮体高度/吃水,T_F/m	20
养殖单元边长,B_n/m	45
侧网高度,H_n1/m	20
底网高度,H_n2/m	20
网衣密实度	0.19
连接器数量	120