Aiming at the complexity of dynamic modeling of elastic polymer draft gear and the low anastomosis between model simulation data and field tests data, a dynamic model of elastic polymer draft gear was built based on the speed-dependent characteristics of the elastic polymer.The model is to combine the structure principle of draft gear with the working process of loading stage and unloading stage of draft gear.An improved particle swarm optimization (PSO) algorithm of adaptive inertia weight was constructed.Based on the drop hammer test data, the parameters of the dynamic model were determined by using the algorithm.The simulation result shows that in the drop hammer simulation tests at different hammer heights, the simulation data and the drop hammer test data are in good agreement, and the relative error of maximum coupler force and maximum displacement between the two is less than 5%.It shows that the dynamic model of the draft gear has high accuracy, and this model provides an effective research means for the analysis of the longitudinal dynamic performance of rapid speed wagon and the optimization of the elastic polymer draft gear performance.
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