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Experimental Characterization of Sound Absorption for Composite PanelMade of Perforated Plate and Membrane Foam Layer

Trinh Van-Hai, He Mu

Archives of Acoustics

2025

Vol. 50, nr 1

17--23

A recent key challenge in noise engineering is the development of structures or materials that achievedesirable acoustic performance in practical settings. Combinations of porous layers and perforated plates of-fer potential composite absorbers for various acoustic applications. The present work conducts experimentalcharacterizations of sound absorption performance of absorbers based on membrane foams combined with per-forated plates. Membrane foams with the well-controlled cell size and porosity are fabricated by milli-fluidictools, whereas perforated plates are made within a tuned perforation ratio. The three-microphone method isused to perform the acoustic measurements. The results obtained from ten combination samples reveal thatthe sound absorption behavior of the foam-based layers can be successfully tailored and improved by a thinperforated plate within a reasonable hole diameter and spacing while maintaining the total thickness of thecomposite absorber.