Sound absorption performance of a micro perforated sandwich panel with honeycomb-hierarchical pore structure core. (28th February 2023)

• Record Type: Journal Article
• Authors: Dong, Chenhao; Liu, Zhao; Pierce, Robert; Liu, Xiaoling; Yi, Xiaosu
• Is Part Of: Applied acoustics. Volume 203(2023)
• Publication Date: 2023-02-28
• Subjects: Hierarchical pore -- Sound absorption -- Sandwich panel; Acoustical engineering -- Periodicals; Periodicals; 620.2
• DOI: 10.1016/j.apacoust.2022.109200
• Languages: English
• ISSNs: 0003-682X

Abstract

Highlights: Carbonized cotton with hierarchical pore structure can enhances the sound-absorbing performance of the structure at low frequency without significantly increasing its weight. The average sound absorption coefficient of the new micro perforated sandwich panel with honeycomb-hierarchical pore structure core is 0.626. Appropriate theoretical and finite element models are established to reveal the sound absorption characteristic of the structure, with 16.8% and 8.6% error respectively. Abstract: A new micro perforated sandwich panel with honeycomb-hierarchical pore structure core is designed and prepared in this study. Carbonized cotton with hierarchical pore structure is combined with a micro perforated honeycomb core sandwich panel, which enhances the sound-absorbing performance of the structure without significantly increasing its weight. The experiment showed that pure carbonized cotton filling can improve the average sound absorption coefficient (at 125, 250, 500, 1000, 2000, and 4000 Hz) of the structure from 0.220 to 0.558, and hierarchical pore structure can further improve the average sound absorption coefficient to 0.626. Meanwhile, appropriate theoretical and finite element models are established, with 16.8 % and 8.6 % error respectively based on the predicted average sound absorption coefficient relative to experimental results.