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A segmented damping device is designed using a cam mechanism in this study. Based on the traditional Voigt dynamic vibration absorber，this device is installed between the main system and subsystem of the dynamic vibration absorber，and the dynamic equation of the vibration absorber is established. Using the principle of equivalent damping energy dissipation within one vibration period，the equivalent damping coefficient of the segmented damping device at the same vibration frequency is obtained. The theoretical solution of a dynamic vibration absorber with piecewise damping characteristic is derived and verified by numerical solution. The vibration absorption characteristics of undamped，traditional linear damping，and dynamic absorber with piecewise damping are compared and analyzed. The results show that the amplitude frequency characteristics of the dynamic vibration absorber with piecewise damping characteristics integrate the characteristics of undamped and traditional linear damping dynamic vibration absorbers. This ensures that the amplitude of the main system at the anti-resonance point is very low，and the suppression effect of the resonance amplitude of the main system is close to that of the traditional linear damping dynamic vibration absorber.
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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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