B柱扰流器对风振噪声的影响及其机理

doi:10.19562/j.chinasae.qcgc.2023.09.025

Abstract

Abstract:

The wind buffeting noise of automobile is one of the important indexes for comfort evaluation. Firstly， the validity of wind buffeting CFD simulation method is verified by road test in this paper. Then， it is explained that the wind buffeting noise is caused by resonance of periodic shedding of turbulent vortex and the interior cavity of the vehicle， and the noise reduction strategy of wind buffeting is proposed. Then the influence of the B-pillar spoiler on the wind buffeting noise and its mechanism are investigated. It is found that reducing the maximum distance of the free shear layer from the outer surface of the B-pillar can reduce the strength of the vortex， thereby reducing the wind buffeting noise. The maximum noise reduction of the spoilers designed in this paper can reach 12.8 dB. Finally， the effectiveness of the B-pillar spoiler is verified by road test. The conclusion of this paper has certain theoretical significance and engineering application value for further understanding and controlling wind buffeting noise.

Key words: wind buffeting, noise reduction, B-pillar, spoiler, CFD simulation, turbulent vortex

Xiaoyong Chen,Lu Yao,Zhengxin Guo,Hao Liu,Ting Luo,Yongliang Wang. Influence of B-pillar Spoiler on Wind Buffeting Noise and its Mechanism[J].Automotive Engineering, 2023, 45(9): 1772-1778.

Figures/Tables 17

References 17

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车速		峰值频率/Hz	乘员耳点风振声压级/dB
车速		峰值频率/Hz	主驾	副驾	左后	右后
40 km/h	仿真	8.7	101.9	102.6	104.9	103.5
40 km/h	试验	9.5	100.8	102.8	106.3	103.5
70 km/h	仿真	14.0	125.3	125.9	126.2	126.2
70 km/h	试验	13.5	121.4	123.4	124.4	123.9
100 km/h	仿真	18.2	131.7	132.4	132.6	133.0
100 km/h	试验	16.5	130.1	132.2	129.7	132.3
误差		≤1.7	≤3.9	≤2.5	≤2.9	≤2.3

方案	峰值频率/Hz	乘员耳点风振声压级/dB
方案	峰值频率/Hz	驾驶员	副驾乘员	左后乘员	右后乘员
原结构	14	125.3	125.9	126.2	126.2
方案A	14	121.8	122.5	122.4	123.0
方案B	14	121.2	121.8	122.4	122.2
方案C	14	128.0	128.6	128.7	128.6
方案D	13	126.8	127.4	127.6	127.5

风振降噪效果		主驾	副驾	左后	右后
方案A	试验	-2.3 dB	-2.3 dB	-2.9 dB	-2.3 dB
方案A	仿真	-3.5 dB	-3.4 dB	-3.8 dB	-3.2 dB
方案B	试验	-3.1 dB	-3.0 dB	-3.0 dB	-3.0dB
方案B	仿真	-4.1 dB	-4.1 dB	-3.8 dB	-4.0 dB

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Influence of B-pillar Spoiler on Wind Buffeting Noise and its Mechanism

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