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This paper took noise generated from air suspension modulation of a vehicle as research object. Through transmission path study, the paper determined that the noise was mainly generated through the body structure excited by the air compressor. Through theoretical analysis, it was found that the main factors affecting air suspension noise transmission were the air compressor system modal frequency and Noise Transfer Function (NTF) from the body attaching point to the vehicle interior. The paper proposed optimization schemes including power supply wiring harness wrapping material optimization, bracket vibration isolation and bracket reinforcement + NTF. The results show that bracket vibration isolation is the best scheme, after implementation, the 1st order noise order of air compressor was reduced by 4 dB, 2nd order noise was reduced by 14 dB, and the sound quality in the vehicle was significantly improved.
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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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