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Due to the difficulty of attenuation of middle and low frequency band sound waves in the process of propagation, the control of middle and low frequency broadband sound waves has become a challenging topic, so it is necessary to develop new materials and structures with low frequency sound absorption and noise reduction functions. The special properties of acoustic metamaterials provide new ideas for the development of sound absorption and insulation. In order to effectively control the noise in the middle and low frequency bands, a new spatial spiral acoustic metamaterial was designed and optimized by using the finite element software COMSOL Multiphysics, and the sound absorption and sound insulation performance in the 100~2500 Hz frequency band were calculated and analyzed. With the help of 3D printing for completing the preparation of metamaterial, the sound absorption and insulation performance of spiral acoustic metamaterial were compared in an experimental study to verify the accuracy of the calculation method.
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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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