UM-SIMULINK Co-simulation for the vibration reduction optimization of a magnetorheological damping steel-spring floating slab track

Abstract

To further mitigate the low-frequency vibration of a vibration source induced by the natural frequency vibration of a floating slab track (FST), the key parameters including the maximum damping force and the displacement threshold of magnetorheological dampers (MRDs) were studied under different subway operating conditions. A Graphical user interface (GUI) co-simulation was proposed to investigate the dynamic responses of a magnetorheological damping Steel-spring FST (SSFST). The mitigation effect of different MRD parameters on vibration sources was evaluated with the environmental vibration prediction model. MRDs could reduce the Z-weighted vibration level of the FST and the tunnel wall simultaneously, but the control strategy was necessary to prevent excessively amplifying the mid-high frequency vibration of the tunnel wall. The deterioration of the track irregularity and the train characteristic frequency close to the natural frequency of the FST required an appropriate increase in the MRD maximum damping force. The displacement threshold should be determined in combination with the dynamic displacement generated by the axle load and the corresponding vibration reduction effect. When the same desired effect is obtained, the parameter matching with a smaller MRD damping force and a larger displacement threshold is recommended.