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Outline
Based on the discrete module methodology, this paper proposes a numerical method to estimate the mean drift forces on flexible floating bodies. The continuous structure was first discretized into rigid modules connected by elastic beams. The first-order hydroelastic responses were solved by coupling the hydrodynamics on modules and the structural stiffness of elastic beams in the frequency domain. Based on the first-order motions of the modules, the second-order mean drift forces on each rigid module were calculated by second-order multi-body hydrodynamic theory. The motions and mean drift forces of a freely floating flexible barge using the proposed method were verified against the results obtained by the 3D hydroelastic theory based on modal superposition. Moreover, due to the discrete property of the present method for hydrodynamics, the method can be directly extended to inhomogeneous wave conditions.
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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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