弹性板-圆柱壳水下声辐射特性及影响因素

Underwater acoustic radiation characteristics and influencing factors of elastic plate-cylindrical shell

弹性板-圆柱壳结构是工程领域常用的结构之一,其振动和声辐射特性是目前关注的重点。通过Abaqus软件建立弹性板-圆柱壳耦合结构模型,采用三维声弹性理论计算其振动和水下声场分布,并研究降低声辐射的途径。结果表明,弹性板-圆柱壳水下辐射声场具有明显的对称性,辐射声压级受弹性板振动影响显著;通过提高弹性板厚度,采用L形截面的加强筋和在圆柱壳水平中面位置布置单层弹性板可有效降低圆柱壳水下声辐射。

Elastic plate-cylindrical shell is one of the commonly used structures in the field of engineering, and its vibration and acoustic radiation characteristics are the focus of the current attention. Based on Abaqus software, the model of elastic plate-cylindrical shell structure is established. The vibration and underwater sound field distribution are calculated by using three dimensional theory of sound elasticity, and the way to reduce acoustic radiation is studied. Results show that, underwater acoustic field of the elastic plate-cylindrical shell has obvious symmetry, and the sound pressure level is significantly affected by the vibration of the elastic plate. By increasing the thickness of the elastic plate, the L-shaped cross section of the reinforced rib and one horizontal plane of the cylindrical shell can effectively reduce the underwater acoustic radiation of cylindrical shell.