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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. The results show that the hydrodynamics of the net and frames have an obvious influence on the response of the fish cage and the cross-sectional elasticity produces a certain degree influence on the net twine tension, which provides reference for structural analysis and cross-sectional design of the large vessel-shaped fish cages.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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