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Open AccessReview

Multiple-Layer Microperforated Panels as Sound Absorbers in Buildings: A Review

Institute for Physical and Information Technologies (ITEFI), Spanish National Research Council (CSIC), Serrano 144, 28006 Madrid, Spain
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Buildings 2019, 9(2), 53; https://doi.org/10.3390/buildings9020053
Received: 22 January 2019 / Revised: 6 February 2019 / Accepted: 15 February 2019 / Published: 25 February 2019
(This article belongs to the Special Issue Noise Control in Buildings)
Sound absorbing materials are used in buildings to dissipate sound energy into heat using viscous and thermal processes. Sound absorbers increase the transmission loss of walls, decrease the reverberation time of rooms, and attenuate the noise generated by internal sound sources. Porous absorbers (fibrous, cellular, or granular) are the most used materials in noise control applications because of their high performance-to-cost ratio in the frequency band of interest. However, when cleaning conditions and health reasons are of concern, microperforated panel (MPP) absorbers may be the preferred choice. MPPs, consisting of many minute (sub-millimetric) holes in a panel, are tunable absorbers in a prescribed frequency band, whose main shortcomings are high manufacturing cost and limited absorption frequency band. Currently, the production cost of MPPs can be drastically reduced by means of modern techniques. The absorption frequency band can be considerably enlarged by designing multiple-layer MPPs (ML-MPPs). The aim of this article is to review the high potential of ML-MPPs as a modern, clean, and healthy alternative to porous materials for sound absorption. View Full-Text
Keywords: sound absorption; microperforated panels; multi-layer systems sound absorption; microperforated panels; multi-layer systems
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MDPI and ACS Style

Cobo, P.; Simón, F. Multiple-Layer Microperforated Panels as Sound Absorbers in Buildings: A Review. Buildings 2019, 9, 53.

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