刚性壁存在下的水下圆柱壳结构的声振特性研究

摘要

通过引入镜像原理来处理海底或码头壁面处的边界条件，基于Flügge壳体振动方程和赫姆霍兹方程，建立了在海底或码头壁面存在下的半无限域中圆柱壳结构与声场的耦合振动方程，最后利用稳相法得到了远场辐射声压的近似表达式。对海底或码头壁面存在下水下圆柱壳结构的远场辐射声压进行了计算并与无限域中的结果进行了对比分析，研究发现，海底或码头壁面的存在对水下圆柱壳结构的辐射声场有重要的影响。%The far-field acoustic radiation of a submerged cylindrical shell which is located at a fi-nite distance from the seabed or dock is studied. The image method is applied to satisfy the bound-ary condition of the seabed or dock. Based on the Flügge shell theory and the Helmholtz equation, the structure-acoustic coupling equation is established. The expression of the far-field sound pressure is obtained using the stationary phase method. In order to evaluate the effect of the seabed or dock, the results are compared to those of the submerged cylindrical shell in the infinite fluid domain. It is found that the seabed or dock has important influence on the far-field sound pressure radiated from the submerged cylindrical shell.