Dynamic stiffness analysis of rubber absorber in rail fastenings

Abstract:

Based on a hypothesis superposition theory of nonlinear elastic restoring force (NEF) and nonlinear damping force (NDF), a non-linear dynamic mechanical model was proposed. The rubber absorber was tested according to the working condition and the experimental data was analyzed, found that the simulated result fit the tested result, accordingly verified the validity of this model. The influence law of the amplitude and frequency on the NEF, NDF and the dynamic stiffness was studied. The results show that：With the increase of amplitude, the NEF and the NDF increase rapidly, and the dynamic stiffness increases too. With the increase of frequency, the NEF decreases slightly, but the NDF increases, the dynamic stiffness has an increasing trend too.

Key words:railway engineering; rail fastening; dynamic mechanical model; stiffness; amplitude; frequency