摘要
本文利用SHELL63、BEAM4、SOLID95、COMBIN14四种类型共64187个有限单元和30种几何参数建立了接近于真实船舶(包括机舱动力设备)的有限元模型。在考虑流—固耦合状态下 ,用有限元技术对船舶进行模态分析以及船舶对激励力的振动响应数值计算。在模态分析过程中 ,采用了矩阵缩减的方法来消除局部模态 ,以便获得整体弯曲和扭转振动模态。然后对主机单层隔振器和辅机双层隔振器的减振效果进行了预估。将建立的接近于真实船舶的有限元模型和尾部结构的三维有限元和梁组合模型的数值计算结果进行比较 ,得到一些重要结论。本文为船舶设计人员在船舶设计阶段 ,预报船舶结构振动提供了一条新的途径。
In this paper,a finite element model of entire ship including power plants in engine room is built by using 30 geometric parameters and 40980 SHELL63,9576 BEAM4,13511 SOLID95 and 120 COMNIN14 elements.Finite element method (FEM) is employed to analyze the modes and the vibration responses of ship to excitations in consideration of fluid-structure interaction.In modal analysis,a reduced matrix method was used to eliminate the local modes in order to obtain the overall bending and torsion modes.Then,the vibration isolation effectiveness of vibration isolator of main and auxiliary diesel energy were calculated.The comparison of numerical results calculated by using FEM model and the combine model of stern structure and beam was preformed.Some useful conclusions were obtained.So,a new approach to predict ship structural vibration during design stage is proposed in this paper.
出处
《船舶力学》
EI
2003年第2期102-115,共14页
Journal of Ship Mechanics
