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Title: Preparation and characterization of gradient compressed porous metal for high-efficiency and thin-thickness acoustic absorber
Authors: Yang, XC
Shen, XM 
Bai, PF
He, XH
Zhang, XN
Li, ZZ
Chen, L
Yin, Q
Keywords: Gradient compressed porous metal
Sound absorption performance
Acoustic absorber
Structural parameters
Theoretical model
Morphology characterization
Issue Date: 2019
Publisher: Molecular Diversity Preservation International
Source: Materials, 1 May 2019, v. 12, no. 9, 1413, p. 1-21 How to cite?
Journal: Materials 
Abstract: Increasing absorption efficiency and decreasing total thickness of the acoustic absorber is favorable to promote its practical application. Four compressed porous metals with compression ratios of 0%, 30%, 60%, and 90% were prepared to assemble the four-layer gradient compressed porous metals, which aimed to develop the acoustic absorber with high-efficiency and thin thickness. Through deriving structural parameters of thickness, porosity, and static flow resistivity for the compressed porous metals, theoretical models of sound absorption coefficients of the gradient compressed porous metals were constructed through transfer matrix method according to the Johnson-Champoux-Allard model. Sound absorption coefficients of four-layer gradient compressed porous metals with the different permutations were theoretically analyzed and experimentally measured, and the optimal average sound absorption coefficient of 60.33% in 100-6000 Hz was obtained with the total thickness of 11 mm. Sound absorption coefficients of the optimal gradient compressed porous metal were further compared with those of the simple superposed compressed porous metal, which proved that the former could obtain higher absorption efficiency with thinner thickness and fewer materials. These phenomena were explored by morphology characterizations. The developed high-efficiency and thin-thickness acoustic absorber of gradient compressed porous metal can be applied in acoustic environmental detection and industrial noise reduction.
EISSN: 1996-1944
DOI: 10.3390/ma12091413
Rights: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
The following publication Yang, X.; Shen, X.; Bai, P.; He, X.; Zhang, X.; Li, Z.; Chen, L.; Yin, Q. Preparation and Characterization of Gradient Compressed Porous Metal for High-Efficiency and Thin-Thickness Acoustic Absorber. Materials 2019, 12, 1413, 21 pages is available at
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