In the present work a public transportation network has been acoustically characterised by the means of numerical and experimental tools. The experimental activities have been concerning the different vehicles noise patterns characterisation related to typical operative configurations: for each vehicle experimental tests have been carried out for the noise emissions assessment both in stopped and moving conditions, at different speed and acceleration configurations in order to keep in account noise related to engine, wheels-road interaction, brakes and door operations. The vehicles noise patterns database has been assessed and used for characterising sources emissions within a numerical model representing the overall transportation network; the combination of noise patterns and time-tables provided by the transportation operator permitted to reconstruct the noise map of the overall network in order to compare the expected noise emissions with those allowed by the local noise planning authorities. Finally a validation of the numerical model has been carried on at some critical nodes of the network by experimentally measuring equivalent pressure levels using sampling technique and extracting the noise level components due to the vehicles pass-by and those related to the residual noise. Good agreement has been reached between the numerical predictions and experimental measurements, demonstrating the utility of numerical models for predicting environmental impact levels of road transportation networks.
Numerical - Experimental noise characterisation of road public transportation network
SCARSELLI, Gennaro;LECCE, LEONARDO
2004-01-01
Abstract
In the present work a public transportation network has been acoustically characterised by the means of numerical and experimental tools. The experimental activities have been concerning the different vehicles noise patterns characterisation related to typical operative configurations: for each vehicle experimental tests have been carried out for the noise emissions assessment both in stopped and moving conditions, at different speed and acceleration configurations in order to keep in account noise related to engine, wheels-road interaction, brakes and door operations. The vehicles noise patterns database has been assessed and used for characterising sources emissions within a numerical model representing the overall transportation network; the combination of noise patterns and time-tables provided by the transportation operator permitted to reconstruct the noise map of the overall network in order to compare the expected noise emissions with those allowed by the local noise planning authorities. Finally a validation of the numerical model has been carried on at some critical nodes of the network by experimentally measuring equivalent pressure levels using sampling technique and extracting the noise level components due to the vehicles pass-by and those related to the residual noise. Good agreement has been reached between the numerical predictions and experimental measurements, demonstrating the utility of numerical models for predicting environmental impact levels of road transportation networks.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
