Formation Mechanism of Metro Wheel Polygonal Based on Vehicle-Track Coupling
Wheel polygonal wear will deteriorate the vibration environment of rail vehicles,lead to resonance fatigue failure of structural components,and seriously threaten driving safety.To study the formation mechanism of wheel polygonal wear of metro vehicles,the dynamic line tracking test was carried out,and the vertical coupling finite element model and dynamics model of the track were established.In addition,the iterative simulation analysis of long-term wheel-track wear was carried out.The results show that the wheel polygonal wear of 7-9th order occurs in the measured vehicle,which leads to the forced vibration of 50-70 Hz,and the frequency is close to that of the P2 force during the coupling vibration of the wheel-track system.Through the iterative simulation analysis of wheel wear,it is determined that P2 force resonance of the wheel-rail system caused by periodic irregular rail joint weld is the root cause of the 7th-9th order wheel polygonal wear.Under the long-term action of P2 force,the floating slab track bed and the ladder sleeper track bed of steel spring will cause 8th and 15th order wheel polygonal wear,respectively.
metro vehiclewheel polygonvehicle-track couplingwear modelvehicle dynamics
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