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The noise generated during the relays pick-up and disconnection of the power battery for a new energy vehicle is significant. To address the issue, the contribution of the relay noise transfer path is tested and analyzed in a semi anechoic chamber, and the results show that the contribution of the structural transfer path is higher than 70%. The paper proposes to reduce the hardness of the rubber vibration isolation pad at the Battery Distribution Unit (BDU) mounting point and past the damping material on the cover plate of the power battery. Vehicle verification results show that the sound pressure level of the optimized relay pick-up and disconnection noise is reduced by 3.9 dB(A) and 4.1 dB(A) respectively, and the noise of relays in the vehicle is improved significantly.
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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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