In this paper, based on the poor dimension matching accuracy of engine hood caused by the deformation of gas springs acting on the hood, through the simulation analysis of CATIA three-dimensional virtual assembly, and using MATLAB to numerically optimize the installation parameters of gas springs, reasonable design parameters of gas spring were worked out, and then corresponding design changes were made, and the assembly effect on the real vehicle was verified, controlling the dimension matching accuracy of engine hood within the target range. For the design parameters’ change law of the engine hood gas springs, the following conclusions can be drawn: (1) the more front gas springs are installed on the engine hood, and the more backward gas springs are installed on the vehicle body, the larger the elastic force ratio of gas springs is; (2) the more front gas springs are installed on the engine hood, and the more front gas springs are installed on the vehicle body, the larger its travel S is; (3) in order to improve the deformation problem of the gas springs acting on engine hood, the gas springs should be installed as front as possible on the engine hood, on account of reducing the maximum compressive force.
| 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 |