Here, aiming at poor low frequency sound absorption performance of single foam aluminum porous plate, a sound absorption structure of “aluminum foam plate-quadratic residue diffuser (QRD)” composite absorber was proposed, it could take in account both low frequency and broadband sound absorption. The analysis model for the aluminum foam plate-7th order QRD composite absorber was established, this model was substantialized and experimental measurements for its normal incidence sound absorption coefficient were conducted in impedance tube. The correctness of the analysis model was verified through comparing its analysis results with experimental ones. Effects of multiple structural parameters of this model-based composite absorber on its sound absorption performance were analyzed. Influence laws and reasons of the maximum depth of QRD back cavity and QRD order number on the composite absorber’s sound absorption performance were analyzed. Three nested compound absorbers were designed, and the asymmetric and unequal width distribution nested compound absorber could have good broadband sound absorption characteristics. Effects of main structural parameters of aluminum foam plate on the composite absorber’s sound absorption performance were analyzed to reveal the change of porosity having a larger influence on sound absorption coefficient.
Key words
quadratic residue diffuser (QRD) /
foam aluminum /
composite sound absorber /
sound absorption coefficient /
nested sound absorber
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