Abstract
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.References
[1] K. ATTENBOROUGH, Review of ground effects on outdoor sound propagation from continuous broadband noise, Appl. Acoust., 24, 289-319 (1988).
[2] W. BOWLBY, Highway noise prediction and control, [in:] Acoustical Measurements and Control, C.M. HARRIS [Ed.], McGraw-Hill, New York 1991.
[3] S. BRANDT, Statistical and computational methods in data analysis, North-Holland, Amsterdam 1976.
[2] W. BOWLBY, Highway noise prediction and control, [in:] Acoustical Measurements and Control, C.M. HARRIS [Ed.], McGraw-Hill, New York 1991.
[3] S. BRANDT, Statistical and computational methods in data analysis, North-Holland, Amsterdam 1976.
