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The multi-spherical shells composite structure is a common structurural form of manned submersibles. A vibro-acoustic coupling model of multi-spherical shells system considering acoustic field coupling between shells was established by using the translationnal addition theorem for spherical wave function. The acoustic field coupling characteristics and their influencing factors of a series of spatially-distributed spherical shells were studied. The results show that the acoustic field interaction can change the coupling between the modes of the spherical shells. The contribution of a single mode to the vibration of the spherical shell is no longer limited to a single peak, and thus affects the spectral characteristics of the acoustic radiation. Both shells of the double spherical shells system generate acoustic radiation. There is a strong field coupling effect between two spherical shells under axial excitation. When the excitation force deviates from the axial direction, the field coupling effect gradually weakens. The double spherical shells system composed of spherical shells with different scales expands the frequency range of effective coupling, and the modal characteristics of both shells appear in the acoustic field. When the spherical shells are arranged in series, the acoustic field coupling has a transmission effect. While the spherical shells are distributed at different angles, the spatial distribution of acoustic field becomes more complex.
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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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