含内部子结构有限长圆柱壳体水中声振特性分析

Analysis on Vibration and Acoustic Radiation of Underwater Finite Cylindrical Shell with Interior Plate

研究了多振动源激励下水中含内部子结构的有限长圆柱壳体声辐射和振动特性,基于板壳理论得到了圆柱壳体和平板的应变能和动能,由结构声振耦合得到了多振动源激励力和流体载荷的势能,用Lagrange乘子表示板与壳体的连接条件,建立了多源激励下水中含平板有限长圆柱壳体的声振耦合方程,研究了平板位置、激励源作用距离等对壳体声振特性的影响;研究结果可为水下航行体的振动与噪声控制提供理论依据。

An analysis on vibration and acoustic radiation was presented for underwater finite cylindrical shell with multiple excitations. The strain energy and kinetic energy of cylinder and plate were gained based on theory of plates and shells, and the potential energy of shafting excitation and fluid loading was found based on sound-vibration coupling, and the connection condition of plate and cylinder was expressed by Lagrange multipliers, and then the vibro-acoustic equations of finite cylinder with interior plate under shafting excitation were established. The influence of flat position and excitation source range on vibroacoustic characteristics of shell was studied. The results can provide theoretical basis for the vibration and noise control of the underwater vehicles.