【摘要】 采用Fl櫣gge壳体理论描述圆柱壳体的振动,将环肋对壳体的加强作用,等价为作用在壳体上的支持力.利用流场Helmholtz方程及流场与圆柱壳体的耦合条件推导出声—流场—结构的耦合振动方程,然后采用相应的求解方法,对环肋圆柱壳低阶模态声辐射性能进行了分析,讨论了不同的轴向和周向低阶模态对声辐射性能包括辐射声功率级、径向均方速度级的贡献大小.为主动控制方法降低环肋圆柱壳的振动噪声,提供了理论依据.更多还原

【Abstract】 The Flügge theory of shell is applied to describe shells’ motion. The effects of ring-stiffeners are treated as reverse forces and moments acting on the cylindrical shell. In the process of studying the acoustic field produced by vibration of the submerged cylindrical shell, the structure dynamic equation, Helmholtz equation in the fluid field and the continuity conditions of the fluid-structure interface compose the coupling vibration equation of the sound-fluid-structure. By use of the solution of the equation, the influence of the low order mode on the sound radiation is discussed. It offers the theoretical basis for using the active control to reduce noises of the stiffened shells.更多还原