Study on thefinite elastic plate´snear-field acoustic characteristicsby FEM+BEM

When the vector hydrophone is applied to the underwater platform, the acoustic wave that scattered by the platform has a serious impact on the measuring properties of the vector hydrophone. Regarding to the vector hydrophone´s engineering application, a study on the near-field acoustic characteristics of the finite elastic plate is reported. In this paper, the theoretical basis of the finite element method(FEM) and the boundary element method(BEM)is presented, the FEM+BEM couple function is deduced, and a research on the near-field acoustic quantity´s spatial distribution of the scattering sound field and the total sound field is conducted. The results show that, the scatter and incident angle of the sound waves render symmetric distribution on the elastic plate´s normal direction, and the near-field interference zone presents strip distribution. With increased frequency, the interference becomes denser.