Several methods have been introduced to describe acoustical properties of road pavements in situ, such as the extended surface technique (Adrienne), the Statistical Pass-By and Close Proximity methods. In general the aim of these techniques, normed in ISO standards, is to evaluate some indexes that may be representative of noise generation and propagation with respect to tyre-road interaction and surface absorption. In this paper we use results obtained in the LEOPOLDO project, that involves measurements carried out on many sites all over Tuscany Region characterized by typical conditions of Italian roads, to review the state-of-the-art of acoustical parameters in the modeling of road vehicles showed in the HARMONOISE documents. This task has been accomplished by comparing the theoretical results obtained from the HARMONOISE prediction method with the energy levels measured at the microphone locations close to the road borders, in order to apply corrections to the parameters influencing sound generation and propagation. As a consequence, we introduce a new parameter, related to transfer function between source and receiver sound energy levels, which involves ground reflection effects, obtaining a more suitable characterization of road surface acoustical behaviour.
Road noise characterization by Harmonoise procedures reviewed for the Italian case
LOSA, MASSIMO;
2008-01-01
Abstract
Several methods have been introduced to describe acoustical properties of road pavements in situ, such as the extended surface technique (Adrienne), the Statistical Pass-By and Close Proximity methods. In general the aim of these techniques, normed in ISO standards, is to evaluate some indexes that may be representative of noise generation and propagation with respect to tyre-road interaction and surface absorption. In this paper we use results obtained in the LEOPOLDO project, that involves measurements carried out on many sites all over Tuscany Region characterized by typical conditions of Italian roads, to review the state-of-the-art of acoustical parameters in the modeling of road vehicles showed in the HARMONOISE documents. This task has been accomplished by comparing the theoretical results obtained from the HARMONOISE prediction method with the energy levels measured at the microphone locations close to the road borders, in order to apply corrections to the parameters influencing sound generation and propagation. As a consequence, we introduce a new parameter, related to transfer function between source and receiver sound energy levels, which involves ground reflection effects, obtaining a more suitable characterization of road surface acoustical behaviour.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
