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This paper studied systematically the factors affecting acoustic absorption and insulation performance of double density felt based on impedance tube method and reverberation-anechoic method. The change rule of acoustic absorbing and insulation properties of flat plate materials were analyzed by impedance tube test with the density, thickness and adding sound insulation film of flat plate materials. The rule of change of the acoustic insulation performance of the molding material with its density and adding sound insulation film was analyzed by reverberation-anechoic test. The test results show that the sound absorption performance can be improved by increasing the surface density and thickness of the plate material without sound insulation film. Increase density to improve sound insulation performance. With the addition of sound insulation film, the sound insulation performance is improved. With the addition of felt density, the sound insulation performance of the plate material is improved, and the sound insulation performance of the molding part has no significant change. The material skeleton of the molding part changes due to the processing technologies, so it is necessary to further study the influencing parameters such as flow resistance and porosity of the sample.
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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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