水下结构声辐射时域数值分析法研究

Numerical Analysis Method for Sound Radiation of Underwater Structure in Time Domain

采用有限元和无限元相结合的方法,对水下加筋圆柱壳结构的声辐射进行了数值计算。首先利用ANSYS软件建立声振模型,并在时域内计算流固耦合振动,给出可用于声学分析的数据文件;再利用SYS-NOISE软件采用无限元法在时域内计算辐射声场,并将计算结果与实验值进行了对比。结果表明,提出的在时域内进行水下结构声辐射的计算是切实可行的,为水下结构声辐射仿真研究提供了新的方法。

The numerical calculation of underwater structure＇s acoustic radiated field has been carried out with the FEM and I-FEM. At first, the vibration acoustic model was built by ANSYS and the fluid-structural coupled vibration in time domain was also calculated. Data file for acoustic analysis was therefore presented. Then it worked out the acoustic radiated field in time domain with I- FEM by SYSNOISE, the calculated results were compared with the experimental results. The comparative result shows the validity of the proposed method.