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In order to solve the problem of excessive road noise transmitted to the interior of battery electric vehicles in driving, this article investigated the tire, rear torsion beam and body panel by using the method of “source-path-response”, to identify the coupling between the mode of rear torsion beam and road excitation, which amplified road noise. By dynamical property analysis of body panel through virtual verification, it was identified that the coupling between the mode of rear side wall area and the mode of acoustic cavity was the main cause for excessive road noise in the vehicle. By adding a support structure between the side wall outer plate and C-pillar and D-pillar, the local stiffness of the side wall outer plate was improved, so as to optimize the modal frequency and vibration amplitude in the rear side wall area. The vehicle interior road noise test was carried out. The results show that vehicle interior noise is reduced obviously in the frequency ranges of 78~90 Hz, 120 Hz and 200 ~220 Hz, and its subjective evaluation of interior road noise meets the requirements.
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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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