Abstract
In this paper, a calculation method of the road traffic noise along elevated tracks for LA50 and LAeq using boundary element method (BEM) is presented. We have already proposed other numerical calculation method using Monte Carlo simulation (MCS). The MCS is very suitable to calculate the values of LA50 and LAeq, because it can be easily simulate the direct transmission of the multi-reflection waves. However, the MCS is based on geometrical acoustics, and is difficult to compute the diffracted transmission of multi-reflection waves. Therefore, when the space between bottom of the girder under elevated road and top of the noise barrier on plane road is small. the numerical enors of LA50 and LAeq computed using the MCS increase. Overcoming this difficulty, the BEM based on wave equations is applied to the calculation method of the road traffic noise.
