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This paper investigates the vibration reduction characteristics of spiral acoustic black holes (SABH) on ventilation ducts and the damping mechanism. Compared with conventional vibration damping methodologies, SABH possesses distinct advantages, including its lightweight nature, ease of installation, and the capacity for low-frequency broadband vibration absorption. The finite element simulation results demonstrate the efficacy of SABH in suppressing the vibration of ventilation ducts. Compared with the original duct without SABH, the resonance peak of the first three orders of acceleration levels at the monitoring point are reduced by more than 10 dB after installing SABH. Additionally, the total level of vibration velocity at the monitoring surface decreases by 3.73 dB. The experimental results of the vibration analysis indicate that after the implementation of SABH, the resonance peaks of the acceleration level at the measurement point in the low-frequency band are reduced by more than 10 dB. Furthermore, the high-frequency effects are found to be more pronounced. The study demonstrates that SABH exhibits superior low-frequency broadband vibration damping performance for ventilation ducts, and displays effective convergence and dissipation of wave energy within the pipe 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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