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SPEED DISTRIBUTION INFLUENCE IN ROAD TRAFFIC NOISE PREDICTION
Autori: Gerardo Iannone
Data aparitiei: March 2013
Revista: Environmental Engineering and Management JournalVol. 12Nr. 3
ISSN: 1843 - 3707
Pret: 25.00 RON    
N.A.
Abstract
In road traffic noise issues, experimental measurements are a relevant element in order to understand the problem and to adjust
models. Sometimes, when measurements are not possible or in the designing phase, prediction models are used to perform an
estimation of the equivalent level produced by a road infrastructure. Usually models parameters are obtained by a statistical data
fit and thus they are related to the area where measurements have been performed. These models are suitable for standard
conditions, but they generally fail when vehicle speed distribution influence cannot be neglected, such as non-free flow traffic,
traffic jams, etc.. Thus, the possibility to perform a road traffic noise prediction by means of energy based stochastic approach
represents a challenge in the noise control issues. The equivalent level, in fact, depends on the acoustical energy emitted by each
vehicle, which may be directly connected to its speed by some experimental relations. In this paper, the authors present a new
approach in which the speed of each vehicle is randomly generated according to specific speed distributions. The different
distributions are chosen according to the contextual traffic situation (free flow, pulsed accelerated flow, intersection, mixed flow
composition, etc.), resulting in a detailed microscopic description of the phenomenon, based on a stochastic core model. Once the
speed is generated according to the given distribution, the global level is obtained collecting all the energies sent to the receiver
by each source. The results of this procedure are compared with experimental measurements.




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