多孔材料在整流罩内中高频降噪的应用与优化研究

Based on the JCA model, the FEM simulation and acoustic test are used to obtain the acoustic parameters of the melamine foam and sound-absorbing cotton, the satellite-fairing system is established by means of the statistical energy analysis (SEA). The correctness of the model is verified by comparing with the results of the reverberation chamber. The noise reduction effect of the two materials in the fairing internal noise environment is obtained through the simulation and experiment. The influence of the thickness, laying percentage and laying position for the noise reduction are analyzed with the validated model. The results show that the SEA method combined with the Biot theory can effectively predict the medium and high frequency noise environment and the noise reduction effect of the porous material in the fairing. The total noise reduction is closely related to the thickness, laying rate and laying position, which should be considered when using the porous material for noise reduction.