On sound spectral model of road vehicle for prediction of road traffic noise: Considerations for establishing the ASJ RTN-Model 2003

Abstract

IntroductionIn the ASJ RTN-Model 2003 to predict road traffic noise, a precise computing method of sound propagation is additionally prepared for the situation with complicated boundary condition, and some kinds of spectral model of running vehicle noise are proposed for predictive conditions. In recent Japan, constructions of drainage pavement are being carried out very frequently and widely by the expectation for their noise reduction effect. Therefore, a new prediction method takes account on the condition of drainage pavement. For such a purpose, noise reduction effects on the drainage pavement have been considered, and their simple approximate expressions for numerical calculations could have been obtained. We introduce the circumstances of these considerations and their results as a part of the work establishing the ASJ Mode series.

Road traffic noise prediction model ``ASJ RTN-Model 2013'': Report of the Research Committee on Road Traffic Noise

“…Note: A spectrum model of dense asphalt pavement has been widely used as a typical spectrum of noise from a running vehicle. However, according to recent results of measurements of the frequency characteristics of vehicles, it is clear that at frequencies above 2 kHz, the power level of recent vehicles tends to be lower than that given in ASJ RTN-Model 2003 [71][72][73].…”

Road traffic noise prediction model "ASJ RTN-Model 2008": Report of the Research Committee on Road Traffic Noise

“…frequency characteristics of vehicles, it is clear that at frequencies above 2 kHz the power level of recent vehicles tends to be lower than that given in ASJ RTN-Model 2003 [63][64][65].…”