Sound transmission across a rectangular duct section with a thin micro-perforated wall backed by a sidebranch cavity

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

Abstract

An experimental investigation was carried out in the present study for deeper understanding on the sound transmission across a rectangular duct section installed with a thin micro-perforated panel (as a duct wall) backed by a sidebranch cavity. The contributions of the panel configuration and the cavity depth on reducing sound transmission are examined in detail. Results indicate a complicated relationship between sound power transmission, micro-perforation configuration and backing cavity depth. For panels with strong sound absorption capacity, sound power transmission efficiency is reduced as the panels become less absorptive, but there exists a frequency or frequency band above which the opposite is observed. It appears that there is also a certain level of panel sound absorption below which the sound transmission is strengthened over the whole frequency range of present study when the panel becomes less absorptive to sound.

Citation

Fung, M. L., Tang, S. K., & Leung, M. (2024). Sound transmission across a rectangular duct section with a thin micro-perforated wall backed by a sidebranch cavity. Applied acoustics. Acoustique appliqué. Angewandte Akustik, 219, Article 109920. https://doi.org/10.1016/j.apacoust.2024.109920

• Journal Article Type: Article
• Acceptance Date: Feb 14, 2024
• Online Publication Date: Feb 22, 2024
• Publication Date: Mar 30, 2024
• Deposit Date: Mar 1, 2024
• Publicly Available Date: Mar 5, 2024
• Journal: Applied Acoustics
• Print ISSN: 0003-682X
• Electronic ISSN: 1872-910X
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 219
• Article Number: 109920
• DOI: https://doi.org/10.1016/j.apacoust.2024.109920
• Keywords: Sound transmission; Micro-perforation; Duct noise control
• Public URL: https://hull-repository.worktribe.com/output/4568584