Experience in Determining Equivalent Train Noise Levels Based on the Number of Single Sound Events

Introduction: The railway network development will obviously lead to greater noise loads on people living in areas next to railways thereby resulting in a growing number of complaints about railway noise.

The aim of the study is to develop practical approaches to determining the equivalent noise level during the monitoring period in the railway-influenced area.

 Materials and methods. Noise levels were measured during the passage of suburban electric trains and Lastochka-type electric trains. Measurements were taken separately for each type of electric train and each direction of travel. Each sound event was measured during 2 minutes. Background noise was measured for not less than 15 minutes or until equivalent noise reached its stable level. The study provides formulas for calculating an average noise level for a sound event and the equivalent noise level over the monitoring period.

Results. Average noise values were determined for each type of electric train when moving in each direction. The background noise level was established. The number of trains of each type travelling southward and northward was determined based on train schedules. The equivalent noise level was calculated for the monitoring period using the obtained data. The study relied on the following principles: fixed duration for measuring single sound events and calculation of the equivalent noise level over the monitoring period based on the number of sound events.

Discussion. The measurements made it possible to obtain data on the impact of railway noise on the population. The results can be used to assess the risk of noise impact on people living near railways. The study has identified the need to develop a methodology for measuring railway noise.

 Conclusion. The equivalent noise level was calculated over the monitoring period based on measured noise levels created by passing trains and background noise levels.

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