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Title: Low frequency sound absorption by optimal combination structure of porous metal and microperforated panel
Authors: Shen, XM 
Bai, PF
Yang, XC
Zhang, XN
To, S 
Keywords: Low frequency sound absorption
Combination structure
Porous metal
Microperforated panel
Parameter optimization
Finite element simulation
Experimental validation
Issue Date: 2019
Publisher: Molecular Diversity Preservation International (MDPI)
Source: Applied sciences, 1 Apr. 2019, v. 9, no. 7, 1507, p. 1-18 How to cite?
Journal: Applied sciences 
Abstract: Featured Application The optimal combination structure low frequency sound absorber can be used in acoustic environmental protection and industrial noise reduction. The combination structure of a porous metal and microperforated panel was optimized to develop a low frequency sound absorber. Theoretical models were constructed by the transfer matrix method based on the JohnsonChampouxAllard model and Maa's theory. Parameter optimizations of the sound absorbers were conducted by Cuckoo search algorithm. The sound absorption coefficients of the combination structures were verified by finite element simulation and validated by standing wave tube measurement. The experimental data was consistent with the theoretical and simulation data, which proved the efficiency, reliability, and accuracy of the constructed theoretical sound absorption model and finite element model. The actual average sound absorption coefficient of the microperforated panel + cavity + porous metal + cavity sound absorber in the 100-1800 Hz range reached 62.9615% and 73.5923%, respectively, when the limited total thickness was 30 mm and 50 mm. The excellent low frequency sound absorbers obtained can be used in the fields of acoustic environmental protection and industrial noise reduction.
ISSN: 2076-3417
DOI: 10.3390/app9071507
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 Shen, X.; Bai, P.; Yang, X.; Zhang, X.; To, S. Low Frequency Sound Absorption by Optimal Combination Structure of Porous Metal and Microperforated Panel. Appl. Sci. 2019, 9, 1507, 18 pages is available at
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