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An underwater acoustic structure with metal perforated plate inserted into the traditional anechoic coating is proposed to improve the pressure resistance and sound absorption performance of the structure. The deformation of the acoustic structure under different hydrostatic pressure is studied by the static method. By establishing the acoustic finite element equation under the action of hydrostatic pressure，the sound absorption effect of the acoustic structure under different hydrostatic pressure is analyzed. Compared with the traditional anechoic coating，under the hydrostatic pressure of 0 to 6 MPa，the acoustic structure achieves better broadband sound absorption in the mid-to-high frequency range. In addition，the effects of the thickness，material and porosity of the metal perforated plate on the sound absorption performance of the acoustic structure are discussed. The research shows that the underwater anechoic coating with metal perforated plate is an effective design to improve the pressure resistance and sound absorption performance of underwater acoustic structure.
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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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