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Taking into account of factors such as core magnetic saturation，torque fluctuation，and component flexibility，an electromechanical coupling dynamic model for the switched reluctance motor-planetary gear electric drive system suitable for unsteady state conditions is established，with translational and angular displacements as generalized coordinates，which is validated through experiments. Through simulation analysis，the dynamic characteristics of the system under acceleration and variable load conditions are studied. The results show that under acceleration conditions，the speed at which the electric drive system is most prone to resonance is 3 900 r/min，at which multiple excitation frequencies cross the natural frequency of the system. Among them，the vibration energy generated by the excitation of the 15th order natural frequency at the gear mesh frequency is the largest，and the vibration energy is mainly concentrated in the θy direction of the planet carrier. At the moment of sudden load change，the system produces low-order free vibration dominated by the 5th order natural frequency，with vibration energy mainly concentrated in the θx and θy directions of the inner gear ring and gear housing.
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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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