Full
Outline
To resolve the problems of prominent in-vehicle low-frequency noise, excessive vibration and deteriorated ride comfort of a pure-electric VAN under multiple rotational speed conditions when the air conditioner is turned on, an optimization study on vehicle Noise, Vibration and Harshness (NVH) is carried out. Based on the Transfer-Path-Analysis (TPA) model of"source-path-receiver", the vibration transfer process of the air-conditioning compressor is analyzed, and the modal coupling mechanism between the rigid-body mode of the compressor and the modal of the mounting bracket in the two-stage vibration isolation system is systematically revealed. Aiming at the NVH defects induced by insufficient isolation efficiency of the vibration isolation system, a decoupling method via collaborative optimization of the dynamic stiffness at mounting points and the stiffness of vibration-isolator rubber pads is proposed to effectively reduce interior vibration and noise levels. Vehicle test verification demonstrates that the peak noise at 66 Hz is reduced by 14 dB after optimization, and the subjective evaluation result reaches an acceptable level.
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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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