Frequency analysis of urban traffic noise

The paper presents the analysis results of vehicle traffic measurements which were used to simulate the noise measurands. The Cnossos-EU model were used for this purpose. The traffic flow was measured over the period between January and December 2013. The measurements were documented at one hour intervals throughout the entire 24 hours of the day (1:00-24:00). The results of noise simulations were compared with the equivalent sound level calculated by permanent automatic sound and traffic volume monitoring station. The frequency noise analysis was calculated according to the Cnossos-EU model. The results was described using parameters such as the median C₅₀, average peak level C₉₀, average background noise level C₁₀, percentiles C₂₅ and C₇₅. It was found that in most cases, the distribution of the tested variable was not normal. Analyzes carried out for the tested section of the road showed that the traffic of light motor - and medium heavy - vehicles is the main source of road noise. It has been shown that maximum values of the equivalent sound level occur for the frequency of 1000 Hz. The minimum values are in the octave band f0=125 Hz.