中文摘要：

采用耦合有限元／边界元法计算水中船体的弯扭耦合振动。文中用一维薄壁梁有限元模拟船体梁，在横剖面处用二维边界元方法计算结构表面声压，推导出表征流体对振动特性影响的附加质量阵，编制了用流固耦合方法求解船体振动模态的程序。通过与采用ANSYS软件进行耦合场分析以及刘易斯方法得到的振动模态相比较，验证了文中方法的可行性和应用性。

英文摘要：

A coupled finite element-boundary element method is presented to analyze the bending-torsion coupling vibration of a ship hull in water.A one-dimensional thin-walled beam element is used to model the ship hull.The two-dimensional acoustics boundary element method is employed for the acoustic fluid. Added mass matrix of the fluid is derived to account for the acoustic load,To validate the present approach, a computer code is developed for the vibrational modal analysis of the ship hull and the numerical results are verified by comparing with the results obtained with ANSYS coupled-field analysis and Lewis method.The comparison of the results indicates that the proposed method is appropriate for the vibration analysis of ship hulls.