Modelling the sound absorption of panels with tapered elliptic micro-perforations

Fung, M. L.; Tang, S. K.; Leung, M.

Abstract

A theoretical model is developed in the present study to predict the spectral characteristics of the sound absorption of solid panels with tapered elliptic micro-perforations backed by a rigid wall cavity. In the model, plane wave propagation is assumed along the length of the perforation in the presence of a viscous boundary layer at the internal wall of the perforation. End impedances are approximated using results in existing literature. Validation is done using impedance tube measurements. It is confirmed that the present tapered elliptic perforation model can give much better agreement with experimental results than the conventional cylindrical perforation model for all micro-perforation configurations tested. Results also suggest the importance of perforation density in controlling the variation of sound absorption of the panel absorbers upon changes in perforation configurations.

Citation

Fung, M. L., Tang, S. K., & Leung, M. (2023). Modelling the sound absorption of panels with tapered elliptic micro-perforations. Applied acoustics. Acoustique appliqué. Angewandte Akustik, 213, Article 109654. https://doi.org/10.1016/j.apacoust.2023.109654

• Journal Article Type: Article
• Acceptance Date: Sep 13, 2023
• Online Publication Date: Sep 17, 2023
• Publication Date: Oct 1, 2023
• Deposit Date: Oct 1, 2023
• Publicly Available Date: Oct 3, 2023
• Journal: Applied Acoustics
• Print ISSN: 0003-682X
• Electronic ISSN: 1872-910X
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 213
• Article Number: 109654
• DOI: https://doi.org/10.1016/j.apacoust.2023.109654
• Keywords: Sound absorption; Microperforation
• Public URL: https://hull-repository.worktribe.com/output/4404131