Research On Wave Wear Mechanism Of Metro Curved Rail Based On Quantitative Abrasion

Since the 1960 s,a kind of abrasion named corrugation has gradually appeared on China's railways.In recent years,as urban rail transit has become an important part of the public transport system in many cities,the disease of rails on subway lines has become more and more serious,and corrugation of rails is one of the forms of wear that seriously affects the quality of traffic.The existence of corrugation on railway and subway lines will lead to the failure of sleeper and track bed elasticity,the deterioration of track bed vibration absorption and damping capacity,the significant enhancement of wheel-rail vibration,the significant reduction in the service life of various parts of the track and vehicles,and the increase in the workload of railway line maintenance and maintenance.In China,rail corrugation is mainly eliminated by regular grinding,and this work is costly.Therefore,the corrugation of rails is an urgent and economically important issue.In this paper,the problem of corrugation is discussed from the aspect of the cause of corrugation,and a rail corrugation calculation model integrating the vehicle-track coupling dynamics model,the improved kalker simplified theory and the Archard wear model is established to verify the assumption that the wear at the bulge is smaller than the wear at the depression during the development of corrugation.This paper mainly carried out the following research work:Firstly,the dynamic passing model establishment method of the vehicle on the smallradius curve is introduced.By studying the track-coupling dynamics of the rail vehicle and the wheel-rail contact theory,a suitable mathematical model of wheel-rail coupling dynamics and wheel-rail rolling contact is determined.It considers the dynamic behavior of vehicle tracks on curved sections,and makes appropriate assumptions and ignores the vehicle and track dynamic parameters.In order to quantitatively analyze corrugation,friction wear models need to be considered.The Archard wear model is simpler than other models and the results are more in line with the actual situation.Based on this,a wear calculation model integrating vehicle-track coupling dynamics model,improved Kalker simplified theory,and Archard wear model is established,and modeling is performed using Matlab / Simulink.Secondly,through the formation process of stick-slip vibration,the formation and development mechanism of wave abrasion on the small radius curve of subway are analyzed and assumed.The wave abrasion on the small radius curve is caused by stick-slip vibration between wheel and rail,and the fixed wavelength mechanism is that the abrasion at the bulge is smaller than that at the depression.Using the established model for simulation,through quantitative analysis of creep characteristic curve between wheel and rail and wear amount of corrugaion,it is verified that stick-slip vibration that can wear the rail surface does exist between wheel and rail,and the magnitude of stick-slip vibration affects the wear amount of rail.At the same time,the wheel-rail lateral rolling vibration test bed in the laboratory is introduced and tested.On this basis,based on the rail wave grinding mechanism verified above,the influencing factors of corrugation on curved sections are studied.Due to the characteristics of large changes in passenger flow and short station distances compared to railways,combined with the characteristics of small-radius curve sections,the vehicle load,curve radius,and curve height were studied using the established curve rail wave grinding calculation model.