静水压与阻尼覆盖层对圆柱壳声辐射的影响

Effects of hydrostatic pressure and damping material on acoustic radiation of cylindrical shell

基于有限元和边界元法,对水下结构的耦合振动和声辐射进行了数值计算。首先利用ANSYS软件建立声振模型,并计算流固耦合振动;再利用SYSNOISE软件计算辐射声场,分析了水深及阻尼材料对加肋圆柱壳水下振动和声敷设的影响。结果表明:研究圆柱壳的水下声辐射时必须考虑静水压力的作用,阻尼材料能够有效降低结构的振动及声辐射。为实艇降噪治理方案的设计及效果预估提供参考。

The numerical calculation of submarine＇ s coupled vibration and radiated sound field is carried out with the BEM and FEM. The vibro-acoustic model is built by software ANSYS and the fluid-structural coupled vibration is also calculated. Then the radiated sound field is worked out by software SYSNOISE and the characteristics of underwater sound radiation of stiffened cylindrical shell covered with damping material in different depth are analyzed. The results show that the effect of static wate must be considered when researching the structure sound radiation, and the damping material can decrease the underwater structure sound radiation obviously. This not only can conduct how to deal with the true submarine＇ s noise, but also provide the theory of evaluating the effect.