Finite element model updating of low frequency acoustic structure coupling based on vehicle test

2nd International Conference on Frontiers of Materials Synthesis and Processing

Lin, Zhaoli^1 ; Peng, Yong^2 ; Chen, Zhijun^1 ; Gan, Souwu^1

Chongqing College of Electronic Engineering, Chongqing

400054, China^1

Chongqing Chang An Automobile Co. Ltd, Chongqing

400102, China^2

关键词: Acoustic-structure coupling;    Excitation signals;    Finite-element model updating;    Frequency response analysis;    Low frequency acoustic;    Low-Frequency Noise;    Structural damping;    Vehicle tests;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/493/1/012159/pdf
DOI  :  10.1088/1757-899X/493/1/012159

来源: IOP

【 摘 要 】

The finite element model of a car is established, and the acoustic-structure coupling finite element model of the car is modified considering the influence of structural damping and acoustic impedance of interior material. Through the road test of a real vehicle, the excitation signal and the corresponding interior noise signal under the condition of 50 km/h uniform speed are obtained. Taking the measured excitation signal as the input of the finite element model, the frequency response analysis of the low frequency noise in the frequency range of 20-200 Hz is carried out. The results show that the modified acoustic-structure coupling finite element model can be used to predict the low-frequency noise in the vehicle. The research in this paper can provide reference for vehicle NVH forward design, vehicle vibration and noise prediction and improvement.