This paper presents contour charts for the A-weighted sound exposure level of noise generated during passage of a single vehicle. The ground effect has been taken into account for two types of surfaces. The results can be used for prediction of the equiv alentcontinuous A-weighted sound pressure level of traffic noise.
Expressions for peak A-weighted sound pressure level and A-weighted exposure level produced by a train are derived on the assumption that the noise is generated by a con tinuousline of incoherent dipoles. The attenuation with the distance in excess of geo metricalspreading is modelled by a power law. The interaction of theory and mea surementprocedure is discussed.
Criteria based on Zwicker’s model of loudness and the A-weighted sound-pressure level are used to find the source–receiver distance at which atmospheric absorption becomes significant. The problem is studied for a wide range of temperature and relative humidity variations. It is found that both criteria are nearly equivalent. For the majority of environmental noise sources, including motor vehicles and trains, air absorption cannot be neglected at distances beyond a few hundred meters.
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