摘要：A series of porous sound-absorbing material of binary systems consisting of ethylene-propylene diene monomer (EPDM) filled with molecular sieves (MS), while EPDM was chosen as the matrix polymer and MS as filler and pore former were investigated. The acoustic behavior of the EPDM/MS composites was obtained using an impedance tube. Sound absorption coefficient test showed that by addition of MS, absorption coefficient was remarkably increased up to 0.45 and its peak position was low frequency, demonstrating that EPDM/MS composite is a promising sound absorption material. In addition, the analysis shows that the acoustic performance of composite materials is 20% and the thickness is 4 mm in the low frequency range, and the peak value of acoustic absorption coefficient is 0.65 at 2500 Hz. Based on Maa and Melling theory, this paper proposed an absorption coefficient that considers the effect of perforation interactions. The results show that the structure parameters of the micro-perforated panel affect its absorption coefficient, and the model can search the absorption coefficient more efficiently, with the calculated result close to the experimental value.
关键词：Composite materials;Sound absorption;cavity on the back
