Narrow sidebranch arrays for low frequency duct noise control

Tang, S. K.

Abstract

The present study investigates the sound transmission loss across a section of an infinitely long duct where one or more narrow sidebranch tubes are installed flushed with the duct wall. The finite-element method is used to compute the wave propagation characteristics, and a simplified theoretical analysis is carried out at the same time to explain the wave mechanism at frequencies of high sound reduction. Results show that the high sound transmission loss at a particular frequency is due to the concerted actions of three consecutive sidebranch tubes with the most upstream one in the resonant state. The expansion chamber effect of the setup also plays a role in enhancing sound attenuation at non-resonance frequencies. Broadband performance of the device can be greatly enhanced by appropriate arrangements of tube lengths and/or by coupling arrays on the two sides of the duct. © 2012 Acoustical Society of America.

Citation

Tang, S. K. (2012). Narrow sidebranch arrays for low frequency duct noise control. The Journal of the Acoustical Society of America, 132(5), 3086-3097. https://doi.org/10.1121/1.4756951

• Journal Article Type: Article
• Acceptance Date: Sep 14, 2012
• Online Publication Date: Nov 8, 2012
• Publication Date: Nov 1, 2012
• Deposit Date: Jul 11, 2022
• Journal: Journal of the Acoustical Society of America
• Print ISSN: 0001-4966
• Publisher: Acoustical Society of America
• Peer Reviewed: Peer Reviewed
• Volume: 132
• Issue: 5
• Pages: 3086-3097
• DOI: https://doi.org/10.1121/1.4756951
• Public URL: https://hull-repository.worktribe.com/output/4015965