The Study On The Influence Of Through Hole Of Yaw Damper On Dynamics Performance Of Railway Vehicles

The force and displacement output results were obtained by bench test.The effects of different physical structure parameters of yaw damper against the dynamic characteristics and performance characteristics of the yaw damper were analyzed.By testing different yaw dampers with stretched through-holes,we can get: at low frequencies,the stretched through-holes of the damper only affects the tensile damping force of the yaw damper,and has little effect on the compression damping force.At high frequencies,the stretched through-holes of the damper have less influence on the compression damping force and the tensile damping force.At low frequencies,the compression through-holes of the damper only affect the compression damping force.The compression through-holes have little effect on the tensile damping force of the damper.At high frequencies,the compression hole of the damper has less influence on the compression damping force and the tensile damping force.The bottom through-holes of the damper often affects not only the tensile damping force of the damper,but also the compression damping force of the damper.At high frequencies,the bottom hole of the damper often has a great influence on the compression damping force of the damper,while the bottom through-holes of the damper often has a little influence on the tensile damping force of the damper.Based on the analysis of the advantages and disadvantages of various yaw damper models,a nonlinear model of yaw damper is established by AMEsim.Comparing the results obtained from the bench test,it can be found that the results obtained by AMEsim simulation are in good agreement with the results obtained by the bench test.AMEsim/Simulink/Simpack was used to establish a Co-simulation model combining the nonlinear model and the dynamic model of the yaw damper.The dynamic simulation of the proposed Co-simulation model and the traditional dynamic model were used respectively and the dynamic simulation results were compared.The comparison results show that there is a big difference between the Co-simulation and the traditional dynamics simulation in the stability index and the horizontal stability index,and the difference between the safety index and the vertical stability index is small.Using the established co-simulation model to simulate the dynamics simulation of the different stretching through-holes of the yaw damper and the simulation results obtained by simulating the different through-holes to optimize the stretching through-hole of the yaw damper.The analysis results show that the stability index obtained by the co-simulation of different yaw dampers for stretching through-holes is quite different,and the nonlinear critical velocity increases first and then decreases with the increase of the stretching through-holes of the yaw damper.The lateral stability index obtained by the co-simulation of different yaw dampers is often different,and the lateral stability index is increased with the increase of the stretching through-holes of the yaw damper.There is little difference between the index of vertical stability and vertical stability.