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In recent years，mega-casting aluminum alloy structures have gradually been used to replace traditional stamping-welded body-in-white structures. The study on lightweight design of mega-casting aluminum alloy rear floor structure is conduced in this paper. An equivalent analysis scheme is proposed for the analysis of mega-casting vehicle body components. Regarding the processing and performance of the mega-casting structure，the processing constraints for the design are investigated，and the heterogeneity of its material properties is clarified. Based on the topology optimization method，the design domain of the structure is analyzed and the ideal topological design is obtained. Finally，a lightweight design is carried out，achieving a 7% weight reduction while ensuring performance. The study illustrates the design and optimization process of the mega-casting vehicle body components，which has certain reference significance.
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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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