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This paper aims to study the influence of immersion and liquid filling on the acoustic radiation characteristics of cylindrical shells, and to provide theoretical basis and research methods for the evaluation and measurement of acoustic performance of liquid-filled shells near the interface. The frequency immersion depth spectrum of the radiated sound pressure of a semi-filled infinite cylindrical shell and the frequency liquid-filled height spectrum of a semi-immersed infinite cylindrical shell were calculated by using the finite element numerical simulation method. The results show that there are two obvious resonance phenomena, which are respectively excited by the bending waves and the low-order fluid additional waves. According to the dispersion curve of phase velocity, the prediction formula of resonance frequency was deduced, which can accurately predict the resonance phenomenon in the radiated sound field and provide theoretical support for the control and evaluation of the characteristics of the vibration acoustic radiation line spectrum of the internal tank structure in the mooring state.
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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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