Analysis on the Vibration Characteristics of the 160 km/h Subway Rail Influenced by the Stiffness and Damping of the Subway Fastener System
Combining the vehicle-track coupling dynamics,the vibration characteristics of the 160 km/h subway rail influenced by the stiffness and damping of the subway fastener system are analyzed.Establishing the Timoshenko track model that can simulate the shear and torsion deformation of the rails and programming on this basis for establishing the vehicle-track rigid-flexible coupling model.Basing on the vehicle-track rigid-flexible coupling model,the key vibration and noise reduction indicators such as the vertical vibration acceleration amplitude of the rail and the vibration acceleration level of one-third of the center frequency under different fastener stiffness and damping are simulated and calculated.The results show that:when the subway is running at a speed of 160 km/h,the stiffness of the fastener rubber pad has a more obvious effect on the low-frequency vibration of the track structure below 20 Hz;the fastener rubber pad damping has a significant effect on suppressing medium and high frequency vibrations of the track structure above 20 Hz,especially high frequency vibrations above 200 Hz.It is recommended that the viscoelastic polymer damping of subway fastener rubber pads at speed of 160 km/h be improved within the range of 0.1～0.4×105 N/(m/s).At the same time,the stiffness of the fastener rubber pads should be reasonably increased to reduce low frequency vibration.
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