The Geometry Optimization of Shear-Type Track Rubber Absorber Based on Finite Element Method

Shear-type rail fastening system is an important vibration isolation components in track system. A nonlinear model of shear-type rubber absorber in rail fastening system was built using finite element method (FEM) to simulate the nonlinear vibration behavior of fastening system. Material parameters in this model are obtained by dynamic rubber material tests. The accuracy of model was verified by good agreement between simulation and experimental results. On this basis, geometry parameters of rubber absorber including width, height and inclined angle are modified to achieve better nonlinear mechanical behavior and vibration isolation efficiency, etc. The results show that nonlinear stiffness is closely associated with geometry parameters, and setting reasonable rubber inclined angle is an efficient method to improve vibration isolation efficiency.