| Popis: |
The environmental noise of the railway system can be quantified with a large number of different indicators. The main characteristic of these indicators is the integration time which varies from 125 ms to several hours. A measurement campaign of a large number of trains has been carried out and the most usual long term, short term and very short term indicators have been calculated (Leq,Tp, LAeq,Tp, SEL, TEL, Lmax, LAmax, and LPAFmax). A statistical analysis has been performed to evaluate the statistical characteristics of each indicator for each train type. Boxplot representations show that the range is higher for very short term indicators than for the others. Some representative traffic have been characterized at different locations along the French railway network. Noise indicators have been simulated by combination of the noise measurements of the previous measurement campaign. Then, another statistical analysis has been performed to characterize the noise indicators for each traffic type. For suburban and regional traffic, the correlation between all the indicators is high. This result is not valid for freight traffic. As a conclusion, the use of short and very short terms indicators is discussed. |
