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Vibration comfort is one of the key technical indicators to evaluate the passenger experience of large cruise ships. Due to the high superstructure and the large difference from ordinary ship types, there is no mature approximate calculation method for global vibration of cruise ships. According to the stiffness and mass distribution of a large cruise ship, this paper proposes a design method for the steel global vibration test model, and designs two schemes: the equiscale model and the non-equiscale abnormal model. Then the abnormal model is used to complete the modal test in the air and the pool, and the test results of the dry/wet modes under the loading and unloading condition are given. The results show that the ratio of the natural frequencies of the wet mode to the corresponding dry mode is basically unchanged under the loading or unloading condition. For the same order mode, the ratio of the natural frequencies under the loading condition to the corresponding unloading condition also remains basically unchanged. The steel-hull global vibration test model can better consider the influence of added water mass, which can provide a valuable reference for the design of the global vibration model and the natural frequency prediction of special ship types.
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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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