Archives of Acoustics, 23, 4, pp. 481-490, 1998

Vertical distribution of road traffic noise

R. MAKAREWICZ
Department of Acoustic Design, Kyushu Institute of Design
Japan

R. GOŁĘBIEWSKI
Institute of Acoustics, Adam Mickiewicz University
Poland

Road noise generated by freely flowing traffic is assessed by the time-average sound level, LAT. The noise interaction with the ground surface is the only wave phenomenon that modifies geometrical spreading. A simplified model of the ground effect is applied. The model is founded on the Weyl-Van der Pol solution. Prediction of the time-average sound level, at a perpendicular distance less than 100m and an altitude not exceeding a few tens of meters, requires two simultaneous measurements of LAT at the site of interest.
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Copyright © Polish Academy of Sciences & Institute of Fundamental Technological Research (IPPT PAN).

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