ANALYSIS OF RAIL FASTENER VIBRATION REDUCTION PERFORMANCE BASED ON EQUIVALENT LUMPED MASS METHOD

摘要

In order to evaluate the vibration reduction performance of fasteners (GJ-32, DTVI2) in actual operation conditions, the wheel-rail coupling dynamics model was simplified and built by equivalent lumped mass method. The key to the establishment of numerical model is to simplify a continuous track system into a multi mass-stiffness system with limited numbers of degrees of freedom, which can avoid the process of solving the fourth order partial differential equations. The MBS software Simpack was used to carry out the simulation, and result was compared with the actual on-site testing data. The calculated result shows that GJ-32 rail fastener can achieve slab vibration insertion loss of 8.5 dB in the vertical direction and 7.4 dB in the lateral direction, which is very close to the testing results.