阻尼层对水下圆柱壳辐射声场的去耦特性影响

基于模态叠加法，采用Navier方程描述阻尼层，建立敷设粘弹性阻尼层的水下圆柱壳振动声辐射模型。与数值计算结果比对，验证了计算模型的可靠性。分析圆柱壳的径向均方振速和辐射声功率，研究了粘弹性阻尼层对水下圆柱壳辐射声场的去耦特性影响。结果表明，粘弹性阻尼层的径向均方振速频响曲线可以分作三个频段，当频率较高时，粘弹性阻尼层能降低辐射声功率；与壳体厚度相比，阻尼层厚度对阻尼层去耦特性的影响更大。

Decoupling Characteristic of Viscoelastic Damping Layer and Its Influence on Sound Radiation Field of Underwater Cylindrical Shell

Based on the modal superposition method, a model of vibration and sound radiation from underwater cylindrical shell with viscoelastic damping layer was established, in which the motion of damping layer was described with Navier equation. The model was proved by comparing with numerical results. The decoupling characteristic of viscoelastic damping layer on sound field radiated from underwater cylindrical shell was investigated by analyzing the mean radial quadratic velocity and sound radiated power from cylindrical shell. The results show that the mean radial quadratic velocity frequency response curve of viscoelastic damping layer can be divided into three frequency bands, and the sound radiated power can be reduced better only at high enough frequency. Compared with the shell thickness, the damping layer thickness affects the decoupling characteristic of damping layer more greatly.