Empirical prediction of traffic noise transmission loss across plenum windows

Li, Xiaolong; Tong, Y. G.; Tang, S. K.; Lau, K. K.

Abstract

A parametric study on the traffic noise transmission loss across plenum windows was carried out experimentally in this investigation in an attempt to establish a simple empirical model for predicting this transmission loss. A total of fourteen full scale plenum windows were included in this study. The results of a site mockup measurement were used for model validation. The present model was developed based on the existing plenum chamber theory in which the sound fields inside the plenum window cavities were assumed to make up of a diffracted wave and a reverberant field. Results suggest that both the diffracted and reverberant field inside the plenum window cavities are weaker than those assumed in existing plenum chamber theory. It is found that a model, which assumes frequency-independent diffraction directivity and percentage reverberant field attenuation, gives the best prediction of traffic noise transmission loss. This prediction model is also able to predict site test results with good accuracy.

Citation

Li, X., Tong, Y. G., Tang, S. K., & Lau, K. K. (2019). Empirical prediction of traffic noise transmission loss across plenum windows. Applied acoustics. Acoustique appliqué. Angewandte Akustik, 151, 45-54. https://doi.org/10.1016/j.apacoust.2019.03.004

• Journal Article Type: Article
• Acceptance Date: Mar 3, 2019
• Online Publication Date: Mar 8, 2019
• Publication Date: 2019-08
• Deposit Date: Jul 11, 2022
• Journal: Applied Acoustics
• Print ISSN: 0003-682X
• Electronic ISSN: 1872-910X
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 151
• Pages: 45-54
• DOI: https://doi.org/10.1016/j.apacoust.2019.03.004
• Keywords: Plenum window; Sound insulation; Traffic noise; Prediction modelling
• Public URL: https://hull-repository.worktribe.com/output/4015706