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Due to the significant differences in material properties between the sandwich panel skins and core, sandwich panels exhibit different vibration characteristics in different frequency bands. This leads to different sound insulation mechanisms and calculation methods in different frequency bands. In this paper, theoretical methods applicable to low-frequency, high-frequency, and full-frequency ranges respectively were adopted to investigate the sound insulation performance and mechanisms of sandwich panels in different frequency bands. The results indicate that the sound insulation of sandwich panels in the low-frequency band is mainly determined by bending vibration mode, while the sound insulation in the high-frequency band is more affected by normal longitudinal waves. In the transition frequency band between the low-frequency and high-frequency bands, the sound insulation is affected by both bending waves and longitudinal waves. The phenomenon of the sound insulation trough caused by bending modes of sandwich skins when the core material behaves as an elastic foundation was analyzed in this paper. The influence of material damping on sound insulation in different frequency bands was studied, and the mechanism of damping weakening the sound insulation trough was analyzed. Finally, the effect of core material parameters and panel areal density on their sound insulation performance were presented.
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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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