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Particle damping vibration absorber is a dynamic vibration absorber that uses a mass block containing several particles as the mass element. It has the effect of broadening the effective frequency band of dynamic vibration absorbers and suppressing the secondary line spectrum of dynamic vibration absorbers. However, dynamic vibration absorber control techniques are sensitive to parameter selection, and the vibration equivalent mass of particle damping vibration absorbers changes with variations in excitation amplitude, affecting their vibration absorption performance and practical engineering applications. The method of building a 3D network into the mass block was proposed to improve the above defects. The influence of adding obstacle network into the mass block of particle damping vibration absorber was studied by experiment and simulation in this paper. The results show that when the vibration intensity of the particle damping vibration absorber is high, a part of the particles in the mass block enter a suspended flow state, leading to these particles not participating in the vibration process. As a result, equivalent mass of particle damping vibration absorber is changed, and the vibration absorption frequency has shifted. And the 3D network can keep the vibrational equivalent mass stable by breaking up the suspended flow state of the particles. And the vibration reduction effect is effectively improved on the specific vibration amplitude.
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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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