The Influence of the Dynamic Properties of the Primary Suspension on Metro Vehicle-Track Coupled Vertical Vibration
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Metal coil springs within primary suspensions in particular exhibit strong internal resonances, which can lead to high vibration amplitudes within the spring itself. A dynamic model of the metro vehicle-track coupled system is established, including the dynamic stiffness of the coil spring set. Two variants of the primary suspension are compared: one with the springset above the axlebox and the other with it offset on a radial arm. The effect of the primary suspension design on the random vibration response is analysed. From the results, it is shown that the internal resonances of the coil springs result in different vibration responses of the vehicle for the two cases. Although the dynamic stiffening effect of coil springs is expected to degrade the vibration isolation, for metro vehicles with a radial arm pivot bushing installation, this does not occur. Due to the rotation degree of freedom of the radial arm, the forces acting through the pivot bushing and coil spring set are out of phase, which decreases the bogie vibration at the spring resonances.
KeywordsMetro vehicle Dynamic stiffness Coil spring Internal resonance Primary suspension Dynamic response
This work was carried out while the first author was an academic visitor at ISVR, University of Southampton, sponsored by the CSC Program of China.