Influence Of Wheel/Rail Gap On Dynamic Performance Of Locomotiv

The rapid development of passenger transport and the heavy transport of cargo are the direction of the development of railway transportation in China.For the high-speed,there are a lot of passenger line constructing in China,there are a large number of the passenger line and the existing line.High-speed passenger locomotive cross the line,can use both of the role fully to ease the railway passenger transport situation.In the heavy transport,the development of heavy-haul locomotives is quickly,improve the efficiency of freight effectively;At the same time,the locomotive tread running wheel-rail wear problem seriously,when tread wear to a certain extent,repairing tread with the standard thin tread surface,to improve the wheel-rail matching relationship and the wheel service life,to achieve economic benefits base on ensuring the dynamic performance.Therefore,it is of great significance to study on the applicability of fast passenger locomotive cross-line operation and the applicability of heavy-haul locomotive with thin-wheel tread.In this paper,the locomotive dynamics model was established by using the multi-body system dynamics software SIMPACK for a 200 km/h B0-B0 high-speed passenger locomotive.And the thickness of tread surface is considered.Considering a variety of factors,selected four kinds of wheel-rail clearance conditions to study the dynamic perforrmance(The wheel-rail clearance varies from 11.51 to 35.99mm).The stability of the locomotive,the performance of the straight line and the performance of the curve meet the requirements of the safety of the cross-line transportation under various clearance conditions.From the perspective of dynamic performance,the thin wheel tread maintenance program of ordinary locomotive also applies to the high-speed passenger locomotive.For the lateral stability of the locomotive under large clearance,different methods are used to simulate.Wheel-rail gap varied from minimum working conditions to the maximum,the linear critical velocity and the nonlinear critical velocity decreased by 9.6%,nonlinear critical velocity decreased by more than 30%,and the amplitude of the nonlinear limit ring has a positive correlation with the wheel-rail gap.The influence of the wheel-rail gap on the lateral performance of the locomotive is obvious and the vertical performance is not significant,passing curve,the influence of the wheel-rail gap on the lateral performance of the locomotive is obvious,and the lateral performance of the locomotive is deteriorated in the case of large clearance.The wheel-rail clearance has little effect on the vertical performance of the locomotive.The dynamic model of the heavy-haul locomotive was established based on the multi-body dynamics software SIMPACK.Considering the limit of the orbit tolerance and the limit of the inside of the locomotive,selected four wheel-rail clearance limits to simulate and analyze the dynamic performance of the locomotive,(The wheel-rail clearance varies from 9 to 40.99mm).Even in the gap limit conditions,the stability of the locomotive,linear performance and curve through the performance to meet the locomotive standard maintenance thin wheel tread surface applicability;dynamic operation,Wheel-rail gap varied from minimum working conditions to the maximum,nonlinear critical velocity of heavy-haul locomotive decreased by more than 40%,the lateral performance of the locomotive wheel gap more sensitive than locomotive vertical.The relationship between the performance and the wheel-rail gap is not obvious;when passing curve is,in the case of the small locomotive clearance,the locomotive dynamic performance is well,in the case of the large clearance,locomotive wear to be deteriorated;the increase of the wheel-rail gap,make the dynamic performance of locomotive worse,Wheel/rail gap varied from maximum clearance conditions to the minimum.The flange wear index and guide wheel wear power of heavy-haul locomotive less than 25.6%and 18.9%.