吉林大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (6): 1550-1556.doi: 10.13229/j.cnki.jdxbgxb201406003

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Structural-acoustic coupling and optimal experimental design for automotive interior low frequency noise

CHEN Shu-ming, PENG Deng-zhi, WANG Deng-feng, LIANG Jie   

  1. State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022,China
  • Received:2013-07-11 Online:2014-11-01 Published:2014-11-01

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Abstract:

To predict, analyze and optimize the low frequency noise of a Chinese vehicle, a structural- acoustic coupling finite element model was established. The excitation signals at the suspension mountings and engine mountings, and the responding signal of the interior noise were measured with road testing. Appling the excitation signals to the structural-acoustic coupling model, the frequency response analysis was carried out and the low frequency noise was calculated. The simulation response of noise was compared with the result of testing. The consistency between the simulation and testing results proved the validity of the model. The driver's noise sensitivity on the thickness of each panel of the vehicle was calculated. According to the results of the sensitivity analysis, the damping layer was aligned to the structure to control the noise. The density and thickness of the damping layer were optimized by optimal experimental design. With the optimized damping layer, the peak value of the interior noise was reduced by 1.13 dB(A) and the overall sound level was reduced by 0.62 dB(A), the total mass of the damping layer was reduced by 1.953 kg.

Key words: vehicle engineering, low frequency noise, structural-acoustic coupling, sensitivity analysis, design of experiment (DOE)

CLC Number: 

  • U467.4
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