Simulation Study on the Effect of Wheel-Rail Friction Modifier at Metro Sharp Curve
In order to study the effect of friction modifier on wheel-rail of metro sharp curve,the vehicle-rail system dynamics model of a metro vehicle was established.The relevant indexes of vehicle dynamics performance and wear index under eight friction control strategies were compared and analyzed.The research results show that applying lubricant to the outer rail side only will increase the derailment coefficient,wheel load reduction rate,lateral forces on inner and outer rail side wheels,and vertical stability of the vehicle body.Applying friction modifier to the rail tops on both sides can suppress the increase of derailment coefficient,wheel load reduction rate,lateral forces on inner and outer rail side wheels,and vertical stability of the vehicle body.The friction modifier can reduce the wear index of the inner and outer rail side wheels,and the friction modifier together with the lubricant on the outer rail side can increase the reduction effect of wheel wear index on the inner and outer rail side wheels.Considering the vehicle dynamics performance and wheel-rail wear index,when a vehicle passes the R350 curve,applying friction modifier to the inner rail top and to the rail tops on both sides not only improves dynamic performance,but also reduces the wear index of the inner and outer rail wheels sides.
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