Vehicle structural road noise transmission path under wheel excitation

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (18) : 42-46.

LU Chihua1，LI Yongchao1，LIU Zhien2，LI Qiuyue2，LUO Ting3，XU Yanping3

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Abstract

Based on the basic principle of structural noise transmission path analysis, the CAE model of a vehicle for NVH performance simulation under the excitation of wheel center acceleration was established, and the method for optimizing the vehicle interior peak noise by matching the transfer function was discussed.Taking a certain SUV type of vehicle as a research object, the interior noise and wheel center acceleration of the vehicle at 60 km/h speed were measured at the Xiangyang test site.The wheel center acceleration was used as the boundary condition in the vehicle structural road noise analysis, and the noise near driver right ear was obtained by simulation.The simulation value of the vehicle interior noise is basically consistent with the experimental data, and there are obvious noise peaks at 56 Hz and 112 Hz.The largest contribution path of the peak noise at 112 Hz was determined by the transmission path analysis, and the vibration-vibration transfer function (VTF) of the suspension side in the path was analyzed.Then it was adjusted and optimized to match the noise-vibration transfer function (NTF) of the body-side.The result shows the peak noise at 112 Hz is reduced by 8.45 dB (A).

Key words

road noise / transfer path analysis / peak noise / wheel center acceleration

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LU Chihua，LI Yongchao，LIU Zhien，LI Qiuyue，LUO Ting，XU Yanping. Vehicle structural road noise transmission path under wheel excitation[J]. Journal of Vibration and Shock, 2021, 40(18): 42-46

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