In ocean environment, the sound speed gradient of seawater has an important influence on far field sound propagation. The FEM/BEM is used to decouple the vibroacoustic radiation of the spherical shell, and the Green function of the virtual source chain is adopted for decoupling. For far field radiated Sound Pressure Level (SPL), the Beam Displacement Ray normal Mode (BDRM) is employed. The vibration and near-/far-field radiated SPL of spherical shell is analyzed in shallow sea uniform layer, negative/positive gradient, negative thermocline environment, and deep-sea sound channel. Results show that the vibroacoustic radiation of spherical shell acted at 300Hz can be analogous to dipole. When the radiated field of the spherical shell is dominated by large-grazing-angle waves, it can be analogous to vertically distributed dipole, and the far field radiated SPL is lower; while similar to horizontally distributed dipole if dominated by small-grazing-angle waves, and the far field SPL is high.

在海洋环境中，海水的声速梯度对远场声传播有重要影响。FEM / BEM用于解耦球形壳的声波辐射，并采用虚拟源链的Green函数进行解耦。对于远场辐射声压级（SPL），采用束位移射线法线模式（BDRM）。在浅海均匀层，负/正梯度，负温跃层环境和深海声通道中分析了球形壳的振动和近/远场辐射SPL。结果表明，在300Hz频率下作用的球形壳体的振动声辐射可以类似于偶极子。当球形壳体的辐射场被大掠角波控制时，它可以类似于垂直分布的偶极子，远场辐射声压级较低；如果由小掠角波控制，则类似于水平分布的偶极子，并且远场SPL高。