Research on Dynamic Performance of the Inner Axlebox Vehicle Passing the Turnout Forks
Turnout forks are crucial components that guide railway vehicles in changing tracks,but their complex structure can lead to significant wheel-rail interactions when vehicles pass through,cau-sing vibrations and shocks on both the vehicle system and track structure.Thus,they are considered a major weak point in railway lines.To investigate the effects of vertical irregularities in turnout forks on the dynamic performance of the inner axlebox vehicle,a vehicle dynamic model considering the drive unit was established.Internal and external excitation such as the gear engagement and vertical irregularities in turnout forks were considered.The wheel-rail interaction forces and the vibrations of key components in the vehicle system were extracted when the vehicles pass through fixed turnout forks at different speeds in the straight direction.The research results indicate that the vertical irregularities induced by the fixed turnout fork cause significant shock forces between the wheel and rail.The wheel-rail interac-tion forces will increase significantly when the inner axlebox vehicle passes through the turnout.In addi-tion,as the speed of vehicle increase,these impact forces also increase.At the same time,the key com-ponents of the vehicle system such as axleboxes,gearboxes,and motors are significantly affected by the impact of vertical irregularities induced by the fixed turnout,resulting in increased vibration levels.Mo-reover,vertical irregularities in turnout frocks impose substantial shock loads on the drive unit of the in-ner axlebox vehicle,affecting the motor suspension points and gearbox rod joint.
inner axlebox vehicledrive unitturnout forkshock and vibrationdynamic perform-ance
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