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The failure of traditional traffic noise control for quiet areas

Wolfgang Kropp (Institutionen för teknisk akustik, Vibroakustik) ; Jens Forssén (Institutionen för teknisk akustik, Vibroakustik) ; Mikael Ögren (Institutionen för teknisk akustik, Vibroakustik) ; Pontus Thorsson (Institutionen för teknisk akustik, Vibroakustik)
Proc. Inter-Noise 2004 (and 33rd International Congress and Exposition on Noise Control Engineering), Prag, Czech Republic, August 22-25 (2004). (2004)
[Konferensbidrag, övrigt]

One can consider the acoustic soundscape as consisting of two parts the direct acoustic soundscape and the diffuse acoustic soundscape. This fact has important consequences when attempting to change the acoustic soundscapes. The traditional approach to control traffic noise by means of noise barriers or change of traffic distribution is only valid for the areas directly exposed from sources (direct acoustic soundscape). These areas will experience a certain decrease of sound pressure levels when applying these noise control measures. However there will be a lower limit for reduction due to the presence of a diffuse acoustic soundscape. To control/modify such a diffuse acoustic soundscape has been shown very difficult by traditional means of noise control. Main characteristic of diffuse acoustic soundscapes is the presence of a multitude of sources, distributed over a wide area contributing evenly to the acoustic soundscape in a certain areas. Screening will only lead to a redistribution of sound, however consequences of such a redistribution will not be recognised in a diffuse sound field. Absorption has been identified as a main parameter to control diffuse acoustic soundscapes. Reducing sound pressure levels in shielded areas such as inner-yards can only be achieved by adding acoustically absorbing areas along the transfer path between source and receiver, but especially inside the inner-yard. Redistribution of traffic flow has been shown to have a tremendous effect on the directly exposed side, but only a small effect in shielded areas.

Nyckelord: soundscape, sound propagation, traffic noise, quiet area, barrier, balcony, measurements, calculations



Denna post skapades 2006-09-28. Senast ändrad 2015-01-08.
CPL Pubid: 9717

 

Institutioner (Chalmers)

Institutionen för teknisk akustik, Vibroakustik (1900-2004)

Ämnesområden

Akustik

Chalmers infrastruktur