船用膜片联轴器的膜片组件简化建模方法及模态试验

A Simplified Modeling Method and Modal Testof Diaphragm Assembly for Marine Diaphragm Coupling

针对船用膜片联轴器的膜片组件螺栓连接的复杂性问题,基于薄层单元法对膜片组件的有限元模型进行简化,提出一种新型简化建模方法——结构分割法。对模型静刚度进行计算,确定结构分割法中结合面单元的弹性模量和泊松比。该方法相较于传统的薄层单元法计算效率更高。将结构分割法模型的模态仿真结果与试验结果进行对比,结果表明,结构分割法模态分析得到的振型与试验测得的前三阶振型吻合较好,固有频率误差均在10%之内,验证简化模型仿真的正确性,可为船用膜片组件结合部动力学快速有效建模提供思路。

In view of the complicacy of bolted joint in diaphragm assembly of marine diaphragm coupling,the finite element model of diaphragm assembly is simplified based on the thin-layer element method,and a new simplified modeling method,structural segmentation method,is proposed.The static stiffness of the model is calculated,and the elastic modulus and Poisson's ratio of faying face element in structural segmentation method are determined.Compared with the traditional thin-layer element method,the method is of higher calculation efficiency.The modal simulation results of structure segmentation model are compared with the experimental results.The comparison results show that the vibration modes obtained by the modal analysis with structural segmentation method are in good agreement with the first three order vibration modes measured by the test,the natural frequency errors are all within 10%,and the accuracy of simplified model simulation is verified,which can provide ideas for the rapid and effective dynamic modeling of marine diaphragm assembly joint.