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

Abstract

PREFACE BackgroundIn 1974, the Acoustical Society of Japan first organizes a research committee to develop a road traffic noise prediction model. This committee has been undertaking research activities since then. As a result of its activities, a prediction model called ASJ Model 1975 was published in 1975, which provided a method of calculating the 50 percentile A-weighted sound pressure level (L A50 ) [1,2]. This model was widely accepted and applied to assessments of noise around roads for many years. After that, research activities were continued to improve the accuracy of prediction and expand the scope of its application [3][4][5]. In parallel with these activities, from 1988, the committee worked on the development of a new prediction method based on the equivalent continuous A-weighted sound pressure level (L Aeq ). The outcomes of the research were summarized, and the calculation model (ASJ Model 1993) was published in 1994 [6]. This model proposed general procedures for the calculation of L Aeq at roads with a uniform cross-sectional structure. However, since L A50 was still used as a noise index for road traffic noise assessment in Japan, a method of conversion from L Aeq to L A50 was included in the model.

Noise Emission Models of Electric Vehicles Considering Speed, Acceleration, and Motion State

“… The FHWA model (i.e., federal highway administrative model) [ 24 , 25 ] is expressed as a function of vehicle speed, and it uses a term to reflect the traffic flow regime, but it does not represent the acceleration of vehicles explicitly. The ASJ-RTN model (i.e., Acoustical Society of Japan-Road Traffic Noise model) [ 21 , 22 ] describes a linear relationship between the noise level and the logarithm of speed, including some correction terms for road-related factors. It also considers the effect of the traffic flow states (i.e., the steady state and the unsteady state).…”

“…The ASJ-RTN model (i.e., Acoustical Society of Japan-Road Traffic Noise model) [ 21 , 22 ] describes a linear relationship between the noise level and the logarithm of speed, including some correction terms for road-related factors. It also considers the effect of the traffic flow states (i.e., the steady state and the unsteady state).…”

“…Thus, to describe the characteristics of noise emission in the new situation and update the relevant content of the traffic noise standards, this study aims to develop noise emission models of electric vehicles by a pass-by noise measurement. The proposed models take into account the speed of vehicles, similar to the existing emission models (e.g., the CoRTN model [ 15 ], the RLS 90 model [ 16 ], the NMPB model [ 17 , 18 ], the Harmonoise model [ 19 , 20 ], the ASJ-RTN model [ 21 , 22 ]), as well as the acceleration and the motion state of electric vehicles. The contribution of this study is the noise emission models of electric vehicles considering speed, acceleration, and motion state for the traffic noise environment of China.…”

Traffic noise models and noise guidelines: A review

“…The model is based on certain conditions: type of road (pavement, geometry, and signalized/unsignalized), traffic volume, running speed of vehicles (for steady and non-steady flow), prediction range (length of roadway and height of measurement above the ground), and meteorological conditions. 29,30…”

A Kirchhoff approximation-based numerical method to compute multiple acoustic scattering of a moving source

“…This paper presents a numerical method to predict the sound field generated by a moving source in presence of large reflecting objects, with a focus on the sound in the area surrounding the source itself. There exist several empirical or semi-empirical models to predict road and railway traffic noise [3,4,5,6,7,8] $ http://dx.doi.org/10.1016/j.apacoust.2015.03.016…”