Calculations of Inhomogeneous Ground Effects in Outdoor Sound Propagation Using the Boundary Element Method (BEM)

摘要

This report summarizes the results of a study to calculate the effect of inhomogeneous ground impedance on acoustic wave propagation. The boundary element method was used to investigate the effect of snow or bare ground patches along the acoustic propagation path. This method can be used to calculate the effect of inhomogeneities in the propagation medium with a relatively small computational effort compared to many other methods (for example, the finite difference method). The boundary element method is first verified by showing agreement with a published result, and then shown to give good agreement with experimental measurements.