Relationship between temperature and road traffic noise under actual conditions of continuous vehicle flow

Empirical Study on Temperature Influence on Noise Measurements with the Statistical Pass-By Method

“…The correlations improve slightly when considering individual locations (0.86-0.91). This is in line with previous studies [17,24,31]. This strong correlation indicates that no major differences in correction accuracy between the temperatures are to be expected.…”

“…Since vehicle category P presented good correlations for all locations, we chose to further analyse the different temperature types by using the results from this category (Figure 6). Moreover, the R 2 values of passenger cars are better or similar to other studies [17,24]. Due to methodological differences, a direct comparison between studies is difficult, but the similarities in values indicate that the data and method used in this study are adequate.…”

“…Sustainability 2022, 14, x FOR PEER REVIEW 3 of 19 quency bands in the spectrum, we investigated the frequency dependence of this parameter, as already suggested in previous studies [13,17,24]. Lastly, these analyses have all been performed for three different temperatures (air, road and estimated tyre temperature), as the literature points out the importance of the physical media in assessing temperature coefficients [23,24]. The structure of this paper is organised as follows: in Section 2, the overall research goals, research methodology, methods and selected test locations are described in more detail.…”

“…where γ t is the temperature coefficient for tyre/road noise based on vehicle class and speed, and W U is a reducing factor to account for the diluting effect of power unit noise. The standard requires the use of the air temperature, yet it is argued that the road surface and tyre temperature could also be appropriate for this correction [23,24]. Tyre temperature appears to be best suited as it is most closely related to the temperature mechanisms.…”

“…This dataset was particularly composed of large numbers of heavy vehicles, shedding light into the temperature-SPL relation for this vehicle category. Additionally, even though the ISO/DTS 13471-2:2021 proposes a single correction coefficient for all frequency bands in the spectrum, we investigated the frequency dependence of this parameter, as already suggested in previous studies [13,17,24]. Lastly, these analyses have all been performed for three different temperatures (air, road and estimated tyre temperature), as the literature points out the importance of the physical media in assessing temperature coefficients [23,24].…”