水下任意形旋转薄壳振动和辐射声的时域研究

本文通过采用DAA2方法,有限元模态展开和直接积分混合方法以及Kirchhoff推迟势的边界元解法在时域上对水下任意形旋转薄壳振动和辐射声进行研究。以水下椭球壳的端部轴对称激励问题为例,对力源的时间函数分别为单频填充脉冲和δ脉冲两种情况给出了一些典型的数值计算结果和实验结果,并进行了讨论。

Time-domain study on the vibration and radiated sound from submerged arbitrary shell of revolution

A study on the vibration and radiated sound from a submerged arbitrary shell of revolution is carried on in the time-domin, where the Doubly Asymptotic Approximations(DAA2) is applied to describe the fluid-shell coupling the hybridized modal decomposition and direct integral method to obtain the vibration response and the boundary element method of Kirchhoff's retarded formula to obtain the radiated sound. Taking a submerged spheriodal shell excited by the CW or δ pulse force, which is located at the one end of the shell, as an example, the numerical and experimental results are discussed.