Reduction of sound transmission across plenum windows by incorporating an array of rigid cylinders

Tang, S. K.

Abstract

The potential improvement of plenum window noise reduction by installing rigid circular cylinder arrays into the window cavity is investigated numerically using the finite-element method in this study. A two-dimensional approach is adopted. The sound transmission characteristics and propagation within the plenum window are also examined in detail. Results show that the installation of the cylinders in general gives rise to broadband improvement of noise reduction across a plenum window regardless of the direction of sound incidence. Such acoustical performance becomes better when more cylinder columns are installed, but it is suggested that the number of cylinder rows should not exceed two. Results also show that the cylinder positions relative to the nodal/anti-nodal planes of the acoustic modes are crucial in the noise reduction enhancement mechanisms. Noise reduction can further be enhanced by staggering the cylinder rows, such that each cylinder row supports the development of a different acoustic mode. For the simple cylinder arrangements considered in this study, the traffic noise reduction enhancement observed in this study can be as high as 4–5 dB, which is already comparable to or higher than the maximum achieved by installing sound absorption into a plenum window.

Citation

Tang, S. K. (2018). Reduction of sound transmission across plenum windows by incorporating an array of rigid cylinders. Journal of Sound and Vibration, 415, 25-40. https://doi.org/10.1016/j.jsv.2017.11.027

• Journal Article Type: Article
• Acceptance Date: Nov 14, 2017
• Online Publication Date: Nov 22, 2017
• Publication Date: Feb 17, 2018
• Deposit Date: Jul 11, 2022
• Journal: Journal of Sound and Vibration
• Print ISSN: 0022-460X
• Electronic ISSN: 1095-8568
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 415
• Pages: 25-40
• DOI: https://doi.org/10.1016/j.jsv.2017.11.027
• Keywords: Sound transmission; Building noise control; Plenum window
• Public URL: https://hull-repository.worktribe.com/output/4015734