Auralization of road traffic:a study of finite length noise barriers
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Examensarbete för masterexamen
Modellbyggare
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Sammanfattning
Road-traffic noise is one of the dominating noise sources in urban areas and consequently
creates problems for health and wellbeing. Engineers and architects often
use mathematical models (auralization) to simulate sound during the planning and
design process of buildings e.g., simulate sound fields in virtual spaces indoors. At
the division of Applied Acoustics at Chalmers a toolbox to auralize sound outdoors
has been developed, with which it is possible to simulate sounds of a vehicle passing
by with or without a noise barrier. A further study of noise barriers is conducted in
this work. The aim was to investigate the Harmonoise model for noise barriers and
to evaluate the perception of the sounds created with the model. The Harmonoise
model was added into the existing toolbox and auralized sounds for different receiver
locations, both with and without noise barrier, were evaluated in a listening
test together with real recorded sounds without noise barrier. The participants in
the listening test noticed a difference in plausibility between the recorded and the
auralized sounds. The auralized sounds with and without noise barrier gave a similar
plausibility at 27 km/h and 45 km/h. The sounds with noise barrier had higher average
plausibility than the sounds without noise barrier, when the receiver was placed
nearest to the edge of the noise barrier. The participants perceived that the sounds
with noise barrier were most plausible when the distance between the receiver and
the road was 7.5 m whereas the plausibility decreased when the distances increased
to 15 m and 30 m. Whereas the average plausibility decreased when a large portion
of the sound clip consisted of sound screened by the noise barrier, a higher average
plausibility was obtained when a shorter time of the sound clip consisted of sound
screened by the noise barrier.
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urban acoustics, auralization, noise barrier