Abstract
The number of long tunnels in Sydney has increased in recent years with the development of underground road and rail projects. Understanding the propagation of noise along the tunnels and into the environment during the construction phase is important when assessing noise for 24/7 tunnelling operations. In-tunnel noise assessment of mechanical equipment is also required as part of the project's technical criteria and approvals. The prediction of in-tunnel noise levels is required from stationary sources such as ventilation fans and jet fans. The acoustic design of these tunnels is challenging as a feature of the acoustics of long spaces is that classical room acoustic theory is not applicable, since the assumption of a diffuse field does not hold with the extreme dimensional condition. This paper details the difference between in-tunnel noise measurements from an omni-directional noise source compared with the modelled results from 3D noise modelling software packages.
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