Sound Absorption Properties of a Composite Multi-cell Acoustic Structure
The sound absorption properties of a composite multi-cell sound absorber were presented and studied.The micro-perforated panel(MPP)layer and the porous material layer were constructed by using Maa's theory and the Delany-Bazley(D-B)model.The theoretical model of the multi-cell sound absorber was established by using the Transfer Matrix Method(TMM)and the equivalent circuit method.The impedance tube simulation model was constructed by using the Finite Element Method(FEM),and the acoustic analysis of the multi-cell sound absorber was presented.Comparison of the results show that the theoretical results are in good agreement with the simulation data.The multi-cell sound absorber has good sound absorption performance in the whole frequency range,and the sound waves in different frequency ranges can be regulated and absorbed through the different arrangements and combination modes,the perforation ratio of the MPP layer,and the thickness of the backed air layer.
万方数据
维普
