With the stress value, the maximum contact pressure and the compression force as evaluation basis, the influence of the straight line length of the return pipe joint and the return pipe on the assembly of the structure was studied by using the finite element simulation analysis method. With the increase of the length of the straight line, the stress value of the joint and the return pipe decreases gradually, and the maximum stress value of the joint and the return pipe is 650% and 295.2% larger than the minimum stress value, respectively. The maximum contact pressure of the inner liner and the outer liner also decreases gradually, and the maximum contact pressure of the inner liner and the outer liner is 384.9% and 290.2% greater than the minimum value. The pressing force gradually decreases, and the maximum value is 678.8% greater than the minimum value. The research results show that change of the length of the straight line has a significant impact on the assembly performance of the structure.
| 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 |