本文首先建立了浅水域声学边界元方程和相应的FEM/BEM耦合振动方程,探讨了水深对结构振动固有频率和振型的影响,流体可压缩性对结构振动固有频率的影响。研究结果表明:水深变化对结构固有频率有影响,随着水深减小,结构固有频率降低,特别是当水深与结构浸深接近时,水深变化对固有频率影响极大,且振型顺序也可能发生变化;而流体的可压缩性对于浅水域结构固有频率影响不大。 In this paper, the acoustic boundary element equations of shallow waters and the corresponding FEM / BEM coupling vibration equations are established. The influence of water depth on the natural frequencies and mode shapes of structures and the influence of fluid compressibility on the natural frequency of structures are discussed. The results show that the variation of water depth affects the natural frequency of the structure, and the natural frequency of the structure decreases as the water depth decreases. Especially when the depth of water is close to the depth of structure, the variation of water depth has a great influence on the natural frequency, The fluid compressibility has little effect on the natural frequency of shallow water structures.