Statistical assessment of environmental noise generated by road traffic

Abstract

The experimental measurements have established that an asymmetry coefficient and an introduced descriptor- the rank of percentile Neq% are the most sensitive to noise variations. The last one is more preferable due to its exclusive relationships with an equivalent level- the corresponding value of this rank of percentile PNeq that coincides with the equivalent level of the measured time interval. It has been found that the introduced descriptor Neq is very sensitive for indicating the dissimilarity of environmental noise (the presence of a casual impulse or high energy noise events). In-situ measurements of the vicinity of roads with intensive traffic in Vilnius City, where stationary urban traffic noise is dominating, indicate that the values of Neq rank obtained during short-term (1560 min) intervals in the period from7:00 to 19:00 are stable and vary from 69% to 74%. When non-stability occurs, a significant increase in the values of this descriptor may be applied as criteria for indicating noise events other than traffic noise and may be used for determining the interval limits of short-term stationary measurement.

Natūriniai matavimai šalia kelių su intensyviu srautu Vilniaus mieste, kai dominuoja pastovus kelių transporto triukšmas, parodė, kad trumpalaikė (15÷60 min) rodiklio Neq vertė nuo 7:00 iki 19:00 yra stabili ir svyravo 69÷74%. Todėl žymus šio rodiklio padidėjimas gali būti naudojamas kaip rodiklis kitiems triukšmams, nebūdingiems nagrinėjamai aplinkai, nustatyti ir taikomas trumpalaikio matavimo intervalo riboms įvertinti.