基于IBEM的水下双层圆柱壳声振性能研究

Research on vibroacoustic characteristic of double cylinder shell underwater based on IBEM

提出了一种基于间接边界元法的快速预报复杂双层壳水下振动及声辐射性能的数值计算方法。本文先是用间接边界元方法研究了单层圆柱壳的振动及声辐射,并与解析法及目前常用的数值算法结构有限元耦合结构有限元,与结构有限元耦合直接边界元方法进行对比验证了间接边界元方法的正确性,进一步推广到双层圆柱壳,并与解析法及试验进行了对照,说明了本文的计算方法可以很好地用于解决双层圆柱壳的振动及声辐射问题。最后,对不同数值算法的优缺点进行了对比分析,并给出解决实际工程问题的建议。

This paper mainly discussed a numeric method of fast prediction of the vibration and sound radiation of complicated double cylinder shell underwater based on indirect boundary element method（IBEM）.Firstly,the IBEM method is used on the calculation of the vibration and sound radiation of a single cylinder shell,compared with the analytical method and commonly used numeric methods nowadays,the structure finite element method coupled with the fluid finite element method（FEM-FEM）and the structure finite element method coupled with the fluid direct boundary element method（FEM-DBEM）,to verify that the IBEM method is correct.Then,IBEM method is used on the double cylinder shell,compared with the analytical method and the experiment data,to verify that the IBEM method can calculate the vibration and sound radiation of the double cylinder shell underwater successfully.At the end,this paper gives the advantages and disadvantages of different numeric methods,and gives advice for solving different practical projects.