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In order to improve the quality of automotive DTS, a multi-level local datum system tolerance design is established on the vehicle body assembly according to the requirements of the whole vehicle DTS goals. By introducing local datum virtual fixtures in the 3D tolerance analysis software 3DCS, parts are assembled into different datum systems, and the tolerance correlation relationship between each level datum is established, achieving the rationality verification of the datum tolerance design at each level of the vehicle body. And the analysis results are incorporated into the design of the vehicle’s Coordinate Measuring Machining(CMM) and chimeric check fixture, as well as the requirements for testing tolerances, to ensure the rationalization of the evaluation of the manufacturing deviation of the vehicle assembly. The vehicle’s DTS goals have been achieved through virtual and real verification.
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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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