Sound absorption enhancement in poro-elastic materials in the viscous regime using a mass–spring effect

Sepide Ahsani*, C. Claeys, T Zielinski, L Jankowski, Fabrizio Scarpa, Wim Desmet, Elke Deckers

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

2 Citations (Scopus)
2 Downloads (Pure)

Abstract

This paper investigates the mechanisms that can be used to enhance the absorption performance of poro-elastic materials in the viscous regime. It is shown that by adding small inclusions in a poro-elastic foam layer, a mass–spring effect can be introduced. If the poro-elastic material has relatively high viscous losses in the frequency range of interest, the mass–spring effect can enhance the sound absorption of the foam by introducing an additional mode in the frame and increasing its out-of-phase movement with respect to the fluid part. Moreover, different effects such as the trapped mode effect, the modified-mode effect, and the mass–spring effect are differentiated by decomposing the absorption coefficient in terms of the three energy dissipation mechanisms (viscous, thermal, and structural losses) in poro-elastic materials. The physical and geometrical parameters that can amplify or decrease the mass–spring effect are discussed. Additionally, the influence of the incidence angle on the mass–spring effect is evaluated and a discussion on tuning the inclusion to different target frequencies is given.
Original languageEnglish
Article number116353
JournalJournal of Sound and Vibration
Volume511
Early online date19 Jul 2021
DOIs
Publication statusPublished - 27 Oct 2021

Bibliographical note

Funding Information:
The European Commission is gratefully acknowledged for their support of the VIPER research project (GA 675441 ). The Research Fund KU Leuven is gratefully acknowledged for its support. The research of E. Deckers is funded by a grant from the Research Foundation – Flanders (FWO), Belgium . This research was partially supported by Flanders Make, the strategic research centre for the manufacturing industry . T. G. Zieliński and Ł. Jankowski would like to acknowledge the financial support from the National Science Centre (NCN) , Poland, under Grant Agreement No. 2015/19/B/ST8/03979 .

Publisher Copyright:
© 2021

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