Analysis of Transient Wheel-rail Rolling Contact Behavior for Metro Tracks with Floating Fasteners
Floating fasteners,as a type of resilient fasteners,provide a low vertical stiffness for metro tracks by supporting the low jaw and web of the rail.However,they intensify the high-frequency wheel-rail interaction.To analyze the influence of flexibility of wheelset and track on the wheel-rail transient rolling contact behavior,three-dimensional finite element model of wheel-rail transient rolling contact for metro tracks with floating fasteners are established by ABAQUS.The model combines implicit and explicit algorithms of the FE method.The influence of wheelset flexibility on wheel-rail contact parameters is analyzed when the wheelset with traction force passed over the rail with smooth surface,dent and periodic irregularity.The contact parameters are mainly the wheel-rail transient contact force,contact patch and contact stress.The simulation results show that the influence of wheelset flexibility on the wheel-rail force is small when the rail surface is smooth.However,its influence on the wheel-rail contact patch and contact stress is obvious.Under an impulse excitation of the dent,the wheelset flexibility has a significant effect on the wheel-rail vertical forces at frequencies of 350-600 Hz,which is related to the reverse rotation and first-order bending modes of the wheel.The contact patch area and maximum contact stress of the rigid wheelset are about 59％-82％and 140％-162％for those of the flexible wheelset,respectively.Under an excitation of the periodic irregularity,the wheel-rail vertical forces above 580 Hz are affected only by the wheelset flexibility due to forced vibrations of the wheel-rail system.
metro trackfloating fastenersdynamic characteristics of wheelset and trackwheel-rail transient rolling contactfinite element method
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