| With its punctuality,environmental protection and good safety performance,the subway has become one of the main ways for the urban public to travel.In the long-term operation of subway,due to the force interaction between wheel and rail,some wheels will appear wheel polygons.Wheel polygons will affect the wheel-rail force,vibration and noise,as well as the dynamic performance of the vehicle.In serious cases,the service life of the parts will be affected.Therefore,in order to ensure the safe operation of subway vehicles,it is necessary to study the influence of subway wheel polygon on wheel-rail force and dynamic performance,so as to improve the running quality of subway vehicles.In this paper,the influence of wheel polygon on wheel-rail force and dynamic performance is analyzed by dynamic simulation calculation based on the measured polygon data of subway wheels--order 12,considering that the phase difference of guide wheel,isolateral wheel and diagonal wheel is 0°,30°,60°,90°,120°,150° and 180°.By calculating the different phase difference of guide wheel,ipsilateral wheel and diagonal wheel,the changes of wheel-rail vertical force,lateral force,axle box vertical and lateral acceleration,frame vertical and lateral acceleration,and wheel load reduction rate are analyzed when considering the excitation of track irregularity in straight section.It is found that the phase difference of guide wheels has a greater effect on the vertical force of wheel and rail,and the maximum value is 139.07 k N,which is 90% higher than that of the polygon phase difference without wheels.The phase difference of diagonal wheels has a greater effect on wheel-rail lateral force,which increases by 200% compared with the polygon phase difference without wheels.The influence of the polygon of the guide wheel and the diagonal wheel on the vertical acceleration of the axle box is greater than that of the same wheel,and the phase difference of the polygon of the guide wheel and the diagonal wheel is 22 times greater than that of the nonwheel.The phase difference of the guide wheel has a greater effect on the lateral acceleration of the axle box,which is 7 times higher than that of the non-wheel polygon phase difference.Because of the damping effect of the first suspension,the wheel polygon has little effect on the frame acceleration.Wheel weight reduction rate has a great influence on the three cases,and the maximum reduction of wheel weight reduction rate is 36% through speed reduction treatment.In the curve section,when the phase difference of guide wheel,ipsilateral wheel and diagonal wheel is 0° and 90° respectively,the radius of the curve is 800 m.The results show that the effect of the guide wheel phase difference of 90° on the vertical and lateral forces of wheel and rail is obvious,which is increased by 80% and 84% compared with that without wheel polygon phase difference.When the phase difference between the guide wheel and the same side wheel is 90°,the vertical acceleration of the axle box is greater,which increases by 22%compared with the non-wheel polygon phase difference.When the diagonal side wheels are in the same phase,the lateral acceleration of the axle box is larger,and the lateral acceleration of the guide wheel axle box outside the curve is larger,which is 10 times higher than that of the polygon phase difference without wheels.There is no obvious change in the frame acceleration value.The guide wheel has the largest derailment factor,with a value of 0.29,an increase of107% compared to the wheel-less polygon.The wheel weight reduction rate of the guide wheel is the largest,and the wheel weight reduction rate is reduced by 27% after speed reduction treatment.In conclusion,the wheel polygon has a great influence on the wheel-rail force,axle box acceleration,wheel weight reduction rate,and has a certain influence on the frame acceleration and derailment coefficient. |
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