Modal finite element calculation and test analysis on U-shaped rubber outer windshield structure of high speed train

With the increase of the passenger train running speed, the U-shaped rubber outer windshield structure is installed at the joint of the train produces deformation vibration under the aerodynamic force of the train. When the excitation frequency of the aerodynamic load is close to the natural frequency of the outer windshield structure, it is easy to cause resonance. In order to analyze the inherent dynamic characteristics of the U-shaped rubber outer windshield structure, using the modal finite element calculation and the test method, the difference between the two constitutive models in the finite element modal calculation was compared, and the influence of the modal test excitation point position and response point on the modal parameters of the U-shaped rubber outer windshield structure was studied. The results are as follows. According to the finite element modal analysis, the number of mesh element layers is too small, resulting in a large stiffness of the calculation results. Using the Mooney-Rivlin constitutive model to calculate the modal parameters of rubber materials is more suitable than linear elasticity model. Choices of the location of the modal test response points can be guided by the resulting structural shape from the finite element mode. The research results can provide reference for the design of U-shaped rubber outer windshield structure of high-speed train. © 2020, Central South University Press. All rights reserved.