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Appl. Sci. 2019, 9(7), 1507; https://doi.org/10.3390/app9071507

Low Frequency Sound Absorption by Optimal Combination Structure of Porous Metal and Microperforated Panel

1
State Key Laboratory in Ultra-Precision Machining Technology, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong SAR 999077, China
2
Department of Mechanical Engineering, College of Field Engineering, Army Engineering University, No. 1 Haifu Street, Nanjing 210007, Jiangsu, China
*
Authors to whom correspondence should be addressed.
Received: 18 March 2019 / Revised: 8 April 2019 / Accepted: 8 April 2019 / Published: 11 April 2019
(This article belongs to the Section Civil Engineering)
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Abstract

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 Johnson—Champoux—Allard 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. View Full-Text
Keywords: low frequency sound absorption; combination structure; porous metal; microperforated panel; parameter optimization; finite element simulation; experimental validation low frequency sound absorption; combination structure; porous metal; microperforated panel; parameter optimization; finite element simulation; experimental validation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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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.

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