Finite difference solution of sound propagation over porous ground

摘要

This paper presents an axis-symmetric pressure-velocity finite-difference formulation (PV-FD) for sound propagation over ground based on Biot theory. Some typical results of simulation are presented and comparisons with the measurements during airblast tests performed in Haslemoen, Norway are presented in order to verify the proposed model. The model can also handle range-dependent and topographic ground. Representative results are presented for two cases of uniform ground with local alterations: one where a region of the ground is assigned a higher permeability, and the other where the same zone is replaced by stiffer zone. The case with a hill above homogeneous poro-elastic ground is also considered. The developed numerical code is shown to be a practical tool for simulating complicated ground features and a useful tool in calibrating empirical sound prediction models.