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

2009; Acoustical Society of Japan; Volume: 31; Issue: 1 Linguagem: Inglês

10.1250/ast.31.2

2432-2040

Kohei Yamamoto,

Vehicle Noise and Vibration Control

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.Afterwards, there was a substantial change in the environmental administration concerning noise.In June 1997, the ''Environmental Impact Assessment Law'' was promulgated, whose enactment was based on the ''Environment Basic Law'' (the law revising the ''Basic Law for Environmental Pollution Control,'' which was issued in November 1993), and it was enforced in June 1999, two years after its promulgation.In addition, the ''Environmental Quality Standards for Noise'' (enacted in 1971) was revised in September 1998 and enforced in April of the following year.In the standards, L Aeq was adopted in place of L A50 as the noise index for road traffic assessment.At the