Realization of a thin and broadband Microperforated panel (MPP) sound absorber

Prasetiyo I., Sihar I., Sudarsono A.S.

Engineering Physics, Faculty of Industrial Technology, Institut Teknologi Bandung, Ganesa Street 10, Bandung, 40132, Indonesia; Department of the Built Environment, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, Netherlands


Abstract

Microperforated panel (MPP) absorber progress has continued with various configurations for a relatively narrow bandwidth. Serial, parallel, and a combination of serial and parallel (hybrid) configurations of MPPs have been proposed to address the bandwidth problem, and experimental results agree well with theoretical ones. However, considerable space is still required, particularly at low frequencies, because of the presence of a backing air cavity. This drawback has limited MPP applications for low-frequency noise control, where longer cavity depths are required. Therefore, in this study, a coiling structure was introduced on the backing air cavity to obtain a thinner MPP for the same targeted operating frequency. Moreover, a parallel configuration consisting of several sub-MPPs was utilized to excite multiple resonances to obtain an overall wider absorption bandwidth. Minute holes were applied to avoid the considerable dips that are generally present in such a configuration. Thin and broadband MPPs were developed, and theoretical and experimental results are provided. © 2021 Elsevier Ltd

Coiled backing cavity; Microperforated panel (MPP) sound absorber; Parallel MPP configuration; Thin and broadband MPP


Journal

Applied Acoustics

Publisher: Elsevier Ltd

Volume 183, Issue , Art No 108295, Page – , Page Count


Journal Link: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85110771507&doi=10.1016%2fj.apacoust.2021.108295&partnerID=40&md5=536c4220633085cb22490f6010a6e360

doi: 10.1016/j.apacoust.2021.108295

Issn: 0003682X

Type:


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