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To address the issue of the baffle of antenna cover baffle obstructing signal transmission and receiving of vehicle ground station under low-elevation condition. Firstly, the solution of the foldable mechanism was identified and the bidirectional spring coaxial parallel system which defined the key technology was studied. Secondly, start with the movement process of the folding mechanism, the mathematical model of total system was established, the influencing factors of spring damping deformation and their analytical values were obtained. Then, the dynamic analysis of the spring coaxial parallel system was carried out, and the dynamic parameters of the system were obtained. The obtained three groups parameters were combined with the virtual prototype for dynamic simulation, and through the analysis of the torsional moment curves under the separate action of the inter and outer springs and their joint action. The results showed that the proposed bidirectional spring coaxial parallel system acted alone compared with the inter and outer springs. The value of dynamic peak not only attenuated significantly(approximately 75 %~90 %)but also the dynamic peak frequency was significantly reduced, which verified that the structure with inter and outer springs connected in coaxial parallel had more stable dynamic characteristics, and which provided the favorable reference for other similar engineering projects.
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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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