Road traffic noise prediction model“ASJ RTN-Model 2008”proposed by the Acoustical Society of Japan-Part 3:Calculation model of sound propagation

摘要

As the third part of“ASJ RTN-Model 2008”,calculation model of sound propagation is presented.The model is an up-grade version of the previous model that was proposed in 2004. This model is basically developed as a practical calculation model based on Geometrical Acoustics and it contains effects of shielding by barriers or buildings,ground surface,air absorption and meteorological condition.Based on newly obtained knowledge,several improvements were made on the calculation method of sound diffraction and reflection to develop the model.The procedures of application to roads with special cases such as interchange, signalized intersection,double deck viaduct,road tunnel,semi-underground road and roads with built-up areas are also included.