一种楔环刚度等效方法

为了确保分析精度的条件下提高带楔环的鱼雷结构分析效率,在优化设计的基础上建立了一种楔环刚度等效方法.建立带接触的三维细节实体元有限元模型和全壳元有限元模型,分别进行非线性静力分析和线性静力分析,以连接部位壳元刚度为参数,以全壳元模型与三维细节模型挠度一致为目标开展优化设计,通过优化设计得到连接部位的楔环等效刚度.采用等效刚度模型和模态分析后发现,等效模型可以在计算精度和计算效率之间取得较好的均衡,证明提出的方法在鱼雷结构设计和强度研究中具有较高的应用价值.

A Method of Effective Stiffness for Wedge-ring Connections

To improve the efficiency and guarantee the accuracy of structure analysis of a torpedo which has wedge-ring connections,a method to construct effective stiffness of the wedge-ring connections based on optimization was presented in this paper.Firstly,Finite Element Method(FEM) Models of detailed three dimensional solid element with nonlinear contact and totally shell element were constituted at the same time,and specific nonlinear static analysis and linear static analysis were deployed accordingly.Then an optimization model was established,parameterized with stiffness of shell elements in connection territory,and with an objective to make a coincidence between the deflection of detailed model and equivalent shell model,and from the optimization result,the effective stiffness of wedge-ring connections were obtained.Finally,static analysis and frequency analysis of the equivalent model were schemed,and it was shown that the equivalent model could arrive a better balance between accuracy and efficiency.These results proved that the method in this paper could be applied in torpedo structure design and strength analysis.