Advance in micro-perforated-panel sound absorbers

K. Liu, J. Tian, F. L. Jiao, F. S. Gu, A. D. Ball, J. Jiang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Theoretical and experimental investigations on the performance of micro-perforated- panel sound absorbers are reviewed in this paper. These absorbers are robust to adverse environments as they can be made with a wide choice of materials. They are clean, nonpolluting and transparent for indoor-lighting. Moreover, for these absorbers there are analytical solutions to their sound absorption. However, for a commonly used micro-perforated-panel absorber, the absorption frequency bandwidth usually covers only 1-2 octaves. Reviewing recent research work, this paper reveals the relationship between the maximum absorption coefficient and the limit of the absorption frequency bandwidth. It has been demonstrated that the absorption frequency bandwidth can be extended up to 3-4 octaves as the diameters of the micro-holes decrease. This has become possible with the development of technology for manufacturing micro-perforated panels, such as laser drilling, powder metallurgy, welded meshing and electro-etching to form micrometer order holes. In this paper, principles of how to choose parameters of a micro-perforated panel are presented. In addition, non-linear absorptive-characteristics of such panels are discussed both theoretically and experimentally in the case of high intensity sound field. This review shows that the micro-perforated-panel absorber has potentials to be one of the 21st century ideal absorbing materials.

Original languageEnglish
Title of host publicationInstitute of Noise Control Engineering of the USA - 35th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2006
Number of pages8
Publication statusPublished - 1 Dec 2006
Externally publishedYes
Event35th International Congress and Exposition on Noise Control Engineering - Honolulu, United States
Duration: 3 Dec 20066 Dec 2006
Conference number: 35


Conference35th International Congress and Exposition on Noise Control Engineering
Abbreviated titleINTER-NOISE 2006
Country/TerritoryUnited States


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