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Wednesday, July 10 • 09:00 - 10:00
Plenary 5: Underground Acoustics

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The characteristics of wave generation and propagation in a medium other than air, i.e. underground and in structures, differ from those of airborne sound waves. In some respects the differences are substantial. Elastic waves occurring underground and in structures are of course better known as vibration. While vibration may itself directly affect machines or structures, or be perceived by human recipients, it also can cause structures to radiate sound. A common example of structure-radiated sound is the rumble heard in buildings above railway tunnels with stiff track support.Characterising sources of vibration, whether railways, machines or construction activities is much more difficult than establishing the sound power of an airborne sound source, not least because readily measurable source characteristics are strongly influenced by the medium supporting the source. The system on which the source is founded and the medium providing the path from source to receiver have complex properties, and the response of the receiving structure is dependent on the path. The receptor, such as a human being, also has dynamic properties which may be coupled to the structure supporting it.When vibration is received as structure-radiated sound, understanding the interface between the structure and the airspace involves wave acoustics rather than more widely used diffuse-field room acoustics. The measurement, prediction and mitigation of vibration all require careful account to be taken of these peculiarities.

Authors
avatar for Rupert Thornely-Taylor

Rupert Thornely-Taylor

Founder and Director, Rupert Taylor Ltd
Rupert Taylor's practice was established in 1968 and has advised clients throughout the world in the fields of:  environmental assessment, industrial noise and vibration, transportation noise and vibration, groundborne noise, ground borne vibration, construction noise and vibration... Read More →



Wednesday July 10, 2019 09:00 - 10:00 EDT
Montreal Ballroom