Research On The Influence Of Curve Superelevation On The Dynamic Performance Of Heavy Haul Train Under Longitudinal Force

With the rapid development of heavy-haul railway technology,the axle load,traction quality,and marshalling length of trains have been increasing,and the damage to the line and track structure has gradually increased.Especially when long and large marshalling trains are running in curved sections,they are affected by different line conditions and Affected by operating conditions,the longitudinal impulse between vehicles increases the unbalanced force of the vehicle body.As an important line parameter,the curve superelevation plays an important role in the safety and smooth operation of the vehicle.Therefore,it is necessary to study the influence of the curve superelevation on the wheel-rail dynamics under the action of the longitudinal force of the train.Based on the established three-car marshalling train model and the long and large marshalling train model,this paper firstly studies the influence of different unbalanced super-elevations on the wheel-rail dynamic performance when the longitudinal coupler force is not considered according to the allowable value range of the superelevation;Based on the law of the influence of different gradients on the longitudinal force of long and large trains under idling conditions,the coupler force is applied in a simplified manner to the front and rear wagons of the three-carriage train,and the dynamics of the unbalanced superelevation of the curve under the coupler force on the wheel-rail dynamics are studied.The influence of performance;finally,the influence of different unbalanced super heights on the wheel-rail dynamics performance when the train is braked is further studied.The main conclusions are:(1)Under the same radius,an excessively large unbalanced superelevation will increase the safety index and adversely affect the safety of train operation;an appropriate under-elevation can take into account the safety of train operation and reduce rail wear;under the same superelevation,The greater the speed and the smaller the radius when the train passes through the curved section,the more unfavorable the wheel-rail force and the rail wear.(2)Under idling conditions,considering the influence of the longitudinal force of the long and large marshalling train couplers,the wheel-rail lateral force value and the derailment coefficient are both increased to a certain extent than without consideration;under the same unbalanced superelevation value,the smaller the radius,The higher the speed,the more significant the longitudinal coupler force has on the wheel-rail dynamics;the effect of coupler force makes the corresponding superelevation point move to the superelevation direction when the difference in vertical force between the inner and outer rails is the smallest.(3)Under braking conditions,affected by the slope of the line and the braking force of the train,the change trend of each dynamic index fluctuates greatly compared with idling;the longitudinal coupler pressure intensifies the dynamic effect of the wheel/rail in the curve section,and the same unbalanced excess The wheel-rail force value and derailment coefficient are significantly increased compared with the idling condition.The smaller the radius,the worse the wheel-rail dynamic performance;when the train passes through the line section of the concave curve and the horizontal curve,the suddenness of the train should be avoided as much as possible.Braking,thereby reducing damage to the track structure and adverse effects on the safety of train operation.