Sound pulse scattering from an edge of thick elastic plates: experimental and numerical investigations

摘要

A sound pulse scattering from an edge of thick plates is experimentally and numerically investigated. Beside the edge diffracted signal, waves radiated by the plate that are excited from the plate edge are also detected in the diffraction process. The phenomena are examined by the elastic plate theory and agreement is observed. The finite difference method (FDM) is used in the numerical calculation. Field distribution around the plate edge and fields at certain points as functions of time arc displayed. Comparison is made with experiments. It is found that the grid size of FDM formulation may affect accuracy of computation significantly, but the results show the same phenomena as that measured in experiments.