Noise reduction in tunnels by hard rough surfaces

Ming Kan Law, Kai Ming Li, Chun Wah Leung

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


This paper examines the feasibility of using two-dimensional hard rough surfaces to reduce noise levels in traffic tunnels with perfectly reflecting boundaries. First, the Twersky boss model is used to estimate the acoustic impedance of a hard rough surface. Second, an image source model is then used to compute the propagation of sound in a long rectangular enclosure with finite impedance. The total sound fields are calculated by summing the contributions from all image sources coherently. Two model tunnels are built to validate the proposed model experimentally. Finally, a case study for a realistic geometrical configuration is presented to explore the use of hard rough surfaces for reducing traffic noise in a tunnel which is constructed with hard boundaries.

Original languageEnglish
Pages (from-to)961-972
Number of pages12
JournalJournal of the Acoustical Society of America
Issue number2
Publication statusPublished - 2008


Dive into the research topics of 'Noise reduction in tunnels by hard rough surfaces'. Together they form a unique fingerprint.

Cite this