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In order to reduce vibration and noise from central roof in commercial vehicles, 4 reinforcing films were added to the central roof at additional production costs, and the films were easy to fall off after painting. The root cause of vibration and noise in large cover parts is the weak rigidity of the part, the paper therefore proposed to increase the height of the reinforcing rib while meeting the thinning rate requirements. After stamping analysis, prototype production and road test, the final solution to improve the rigidity of the center roof was to increase the height of the reinforcing rib from 3.0 mm to 7.5 mm. The problem of corner cracking in drawing was solved to increase crimping forces and reduce residual stresses. The cost per vehicle is reduced by 45 yuan by eliminating the reinforcing film.
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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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