Analysis of Rail Fastener Vibration Reduction Effect Based on Equivalent Lumped Mass Method

In order to evaluate the vibration reduction effect of fasteners (GJ-III, DTVI2) in actual use, the wheel-rail coupling dynamics model is simplified by equivalent lumped mass method. The continuous track system was simplified into the multi mass-stiffness system with limited degrees of freedom, which can avoid the process of solving the four order partial differential equations of rail dynamics. The MBS software Simpack is used to do simulation, and the result is compared with the actual online test data. The calculated result shows that the slab vibration insertion loss of 8.5 d B in the vertical direction and 7.4 d B in the lateral direction has been achieved by GJ-III rail fastener, which is very close to the online test results.