In order to make clear the phenomenon of the zero wheel-rail vertical force of wheel lifter in the simulation process,a wheel lifter-engineering vehicle dynamics model was established.Based on Matlab and Simpack,the causes of the abnormal phenomenon of wheel-rail vertical force are analyzed,when the wheel lifter carries high-speed train passing through the curve track.The effect of vertical stiffness on the carrying characteristics of wheel lifter was studied.The results show that excessive vertical stiffness causes one side of the wheel lifter wheelset to hover over the track,resulting in the zero of wheel-rail vertical force.The wheel lifter should choose the vertical stiffness properly.Otherwise,it will cause too much reduction of wheel weight,affecting the carrying performance of the wheelset.Passing through the curve track,the wheel lifter wheelset show the opposite carrying characteristics partially,due to the reverse roll on the frame relative to the rail surface.
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