船体三维变形响应的数值预报

Numerical prediction of three dimensional deformation response of the ship hull

针对航行中舰船变形问题,采用三维水弹性理论实现了波浪中舰船的动态变形预报。通过拟合不同模态下船体有限元模型的节点位移,实现了将三维模态信息应用于广义流固耦合界面条件。建立了舰船在规则波中的广义水弹性运动方程,求解出各阶振动模态的主坐标。将各阶弹性模态主坐标与预报位置的角变形矩阵相乘,得到角变形响应。针对某实船,分别采用三维水弹性方法和三维刚体方法进行计算,通过对船体结构角变形响应的对比,验证了三维水弹性方法的正确性,同时也证明了该方法在计算效率上的优势。

Aiming at the deformation problem of the navigating ship,the three dimensional（ 3D） hydroelastic method is adopted to predict the dynamic deformation of ships in waves. Through fitting the nodes displacement of different vibration modes,the modal information of the 3D finite model is applied to the generalized interface boundary condition of fluid-structure interactions. Then,generalized hydroelastic equations of ship motion are established and the principal coordinates of different order vibration modes are solved. Furthermore,the angular deformation response could be achieved through multiplying the angular deformation matrix and the principal coordinates of different order elastic vibration modes. Take a real ship as an example,the 3D hydroelastic method and the 3D rigid method are applied to calculate the deformation response of the ship,respectively. Through comparing the results from the two methods,the correctness and high efficiency of the 3D hydroelastic method are proved.